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The physical security features that make the biggest difference are laminated or toughened glazing, multi-point locks with a key or thumb-turn deadlock, reinforced frames with increased fixings, hinge protection, and anti-snap cylinders. Together, these are the building blocks of any credible window or door upgrade, and they are what PAS 24 — the British Standards Institution’s enhanced-security standard — tests as a complete unit. Cloudy2Clear Windows fits and repairs all of them across residential and commercial properties throughout the UK.

The single most important behaviour to adopt right now is the ‘LIFT, LOCK, REMOVE’ routine, recommended by ProtectUK and the Door and Hardware Federation: lift the handle to engage the locking points, turn the key or thumb-turn to fully deadlock, then remove the key. Leaving a multi-point lock on the handle-lift alone does not fully engage the deadlock and leaves the window or door vulnerable.

Key features to prioritise:

• Laminated or toughened glass (or a laminated interlayer in double-glazed units)
• Multi-point espagnolette locks with key or thumb-turn deadlock
• Reinforced frames with fixings into the structural reveal
• Hinge claws, dogbolts or internally located hinge fixings
• Internal beading with security clips or screw-fixed retention
• Window restrictors that allow ventilation without compromising security
• Anti-snap cylinders on any door within the same property

Pro Tip: If you are leaving the property now and have not yet upgraded, lock every window with the key, remove the key, and store it away from the window. That single step removes the most common route for opportunistic entry.

What are the essential security features for your windows?

NPSA’s technical guidance identifies six factors that determine a window’s resistance: opening mode, material assembly, locking mechanism, hinges, glazing method, and installation fixings. Upgrading only one of these while leaving the others weak is a common and costly mistake.

Glazing

Laminated glass holds together when struck, delaying entry by forcing an attacker to work through a sticky, fragment-retaining interlayer. Toughened glass shatters into small pieces on impact, which reduces injury risk but offers less delay. For higher-risk properties, a toughened-plus-laminated unit combines both benefits. Anti-shatter film is a retrofit option that provides similar fragment retention and typically needs periodic replacement to maintain its rated performance.

For casement and tilt-and-turn windows, a laminated inner pane is usually the most practical upgrade. Sash windows often benefit from secondary glazing fixed securely to the reveal, which also adds acoustic performance.

Locks and locking points

Single-point locks secure the window at one location only. Multi-point espagnolette systems engage at the top, bottom, and sides simultaneously, distributing load across the frame. The critical detail: most multi-point systems are not fully secure unless the key or thumb-turn is turned to deadlock after lifting the handle.

“Balanced design means every component — fixings, frame, glazing, locks and hinges — must be upgraded to the same resistance level. Upgrading one part alone leaves weaknesses that an attacker will find.” NPSA

Frames, hinges, and beading

Reinforced frames with fixings set into the structural reveal resist lever attacks far better than frames fixed only into the surrounding plaster. Hinge claws and dogbolts prevent outward-opening windows from being lifted off their hinges even when the hinge itself is exposed. For externally beaded windows, ProtectUK and NPSA recommend security clips, double-sided security tape, or screw-fixed beading to prevent undetected glass removal from outside.

Restrictors allow ventilation while limiting how far a window opens. On escape routes, choose a restrictor with a quick-release mechanism so occupants can exit in an emergency. Shutters can add a further layer of delay when fixed correctly, particularly for ground-floor or basement windows.

Pro Tip: Secondary glazing fixed to the reveal is one of the most cost-effective upgrades for sash windows in conservation areas, where replacing the original frame is not permitted. Check whether the secondary unit carries a security rating before specifying it.

Which UK standards apply and what does compliance actually mean?

PAS 24 is the primary enhanced-security standard for doors and windows in the UK. It tests the complete unit — frame, glazing, and hardware — as a single configuration. A window where the glass meets PAS 24 but the frame does not is not a PAS 24 compliant product.

Part Q of the Building Regulations requires easily accessible windows in new dwellings to resist physical attack. PAS 24 and BS EN 1627 are the two accepted routes to demonstrating compliance. Part Q applies to new builds; it does not retrospectively require existing windows to be replaced, but it sets a useful benchmark when you are specifying replacements.

“PAS 24 compliance is not a component-level claim — it belongs to the whole tested assembly. Swapping the glazing or the hardware after testing voids the compliance evidence.” LABC

Documents to request from any supplier or installer:

• The manufacturer’s whole-unit PAS 24 test certificate, showing the exact frame, glazing, and hardware configuration tested
• LPCB or BRE listing reference where applicable
• UKAS accreditation details for the test laboratory
• Installer membership of FENSA or CERTASS (for replacement windows under Building Regulations notification)
• Written guarantee covering both the product and the installation
• Proof of public liability insurance

Secured by Design accreditation is a useful additional signal: it requires products to meet PAS 24 as a minimum and involves independent assessment.

Repair or replace? Typical UK costs and timelines

The decision usually comes down to three questions: how much frame damage is there, how old is the hardware, and does whole-unit test evidence exist for the current installation?

Ranges are illustrative and vary by frame size, material, access, and region.

Factors that push costs higher include bespoke frame sizes, listed-building or conservation-area constraints, scaffold requirements for upper floors, and the need for PAS 24 tested replacements where Part Q applies. Lead times for standard double-glazed units are typically 2–4 weeks; bespoke heritage profiles can take longer.

When to repair rather than replace:

1. The frame is structurally sound and undamaged.
2. The hardware is faulty but the unit itself has no compliance issues.
3. The property is listed or in a conservation area where replacement is restricted.
4. Budget constraints make a phased approach necessary — prioritise locks and hinges first.

What does a professional inspection and repair actually involve?

A competent installer will ask about the age of the installation, any known faults, access restrictions, and whether the property is listed or in a conservation area before visiting.

On-site, a thorough inspection covers:

• Opening mode and frame condition
• Frame fixings and depth into the reveal
• Glazing retention method (internal or external beading, clips, tape)
• Number and location of locking points
• Cylinder type on any associated doors
• Hinge condition and whether hinge protection is present
• Evidence of previous repairs or upgrades

The written report should include photographic evidence, a clear description of recommended works, any compliance implications, and itemised pricing. Vague quotes that bundle everything into a single figure make it impossible to compare contractors fairly.

On completion, a professional will demonstrate the ‘LIFT, LOCK, REMOVE’ routine to every household member or building manager present, hand over written warranty details, and confirm their public liability insurance is in place. Practical repair steps and expected workmanship standards are worth reviewing before any contractor visit so you know what to expect.

How do you choose the right contractor and what should you ask?

The right contractor will answer your questions directly, provide written evidence, and never pressure you into an immediate decision.

Selection criteria:

• Public liability insurance (ask for the certificate, not just a verbal confirmation)
• Written guarantee covering product and installation
• FENSA or CERTASS membership for replacement window work
• PAS 24 test certificates for any products they propose
• Local references and photographic examples of similar past work

Questions to ask on first contact:

• Do you supply PAS 24 tested units, and can you show the whole-unit test certificate?
• Are the fixings and installation method included within the tested scope?
• What warranty do you offer, and is it backed in writing?
• Can you provide proof of public liability insurance before work starts?

“Any installer who cannot produce a whole-unit test certificate for a PAS 24 product is either supplying a non-compliant product or cannot verify what they are fitting. Either way, walk away.” LABC

Red flags to watch for:

• Evasive or vague answers about test evidence
• No written, itemised quote
• Cash-only payment requests
• Inability to provide trade references or insurance documentation

Pro Tip: Shortlist two or three local installers, compare written quotes line by line, and confirm lead times and contract terms before committing. A contractor who resists putting terms in writing is telling you something important.

For listed buildings or conservation areas, check with your local planning authority before specifying any replacement unit. Secondary glazing and window coverings that meet current regulations are often the only permitted route to improved security without planning consent.

The upgrade that most property owners overlook

Most of the properties Cloudy2Clear Windows visits have at least one window where the lock is worn, the beading is external, or the glazing unit has failed. The glass gets noticed because it looks cloudy; the lock gets ignored because it still turns. That is the wrong priority. A failed seal is a comfort issue. A worn multi-point lock on an accessible ground-floor window is a security issue.

Since 2005, the upgrades that have made the most consistent difference for our customers are multi-point lock replacements, laminated glass units on ground-floor and accessible windows, and hinge protection on outward-opening casements. These are not the most expensive jobs. They are the ones that remove the easiest entry points. Customers who have had these done consistently report fewer concerns at insurance renewal and greater confidence when the property is unoccupied.

We provide itemised quotes, test evidence where applicable, and public liability insurance details on every job. No surprises.

Cloudy2Clear Windows can help you upgrade your window security

Worn locks, failed glazing units, and unprotected hinges are the three most common security gaps Cloudy2Clear Windows finds on inspection visits. Fixing them does not always mean a full window replacement.

Cloudy2Clear Windows offers lock, hinge, and handle repairs, glass replacement with laminated or toughened units, secondary glazing, and fully compliant whole-unit replacements for residential and commercial properties. Every job comes with a written quote, itemised pricing, and a written guarantee.

To book an inspection or get a quote, visit the Cloudy2Clear Windows website or call your local branch. Have the age of your windows, any known faults, and your property type ready to speed up the process. The team is available Monday to Friday, 8:30am to 6:30pm.

Useful sources

1. NPSA: Protect Your Home — Comprehensive guidance on physical security measures for domestic properties, including windows, doors, and perimeter security.
2. GOV.UK: Approved Document Q — The Building Regulations document setting security requirements for doors and windows in new dwellings in England.
3. LABC: Part Q security of windows — Plain-language explanation of Part Q scope, PAS 24 evidence requirements, and what installers must provide.
4. ProtectUK: Physical security measures — Police-backed guidance on anti-shatter film, locks, and complementary deterrents including lighting and alarm systems.
5. BSI / NBS: PAS 24 enhanced security standard — The primary UK standard for whole-unit testing of doors and windows; request this reference when asking suppliers for compliance evidence.

Request manufacturer test certificates, installation evidence, and written warranties from any supplier before work begins.

FAQ

What does PAS 24 compliance mean for a window?

PAS 24 tests the entire window assembly — frame, glazing, and hardware — as one unit. A product is only PAS 24 compliant when all three components match the tested configuration exactly.

Does Part Q require me to replace existing windows?

No. Part Q applies only to easily accessible windows in new dwellings. It does not require existing windows to be upgraded retrospectively, but it sets a useful benchmark when you are specifying replacements.

What is the ‘LIFT, LOCK, REMOVE’ routine?

Lift the handle to engage the locking points, turn the key or thumb-turn to fully deadlock the window or door, then remove the key. Leaving the lock on handle-lift alone does not engage the deadlock.

How long does a multi-point lock replacement take?

A straightforward multi-point lock replacement typically takes 2–3 hours on site. Cloudy2Clear Windows carries out this repair alongside hinge and handle work as part of a single visit where possible.

Do I need planning permission to upgrade window security on a listed building?

Replacing windows on a listed building or in a conservation area usually requires listed building consent or planning permission. Secondary glazing and security film are often the only permitted options; always confirm with your local planning authority before specifying any replacement unit.

Specify fire-rated glass whenever an opening forms part of a fire-separating element. It is a tested, certified component of a fire-resisting system that protects escape routes, maintains compartmentation, and satisfies UK building regulations. Standard toughened or laminated glass offers no fire resistance, regardless of how it looks or how it was installed.

The immediate reasons to specify it are straightforward:

• Life safety: keeps escape routes usable for a rated period so occupants can get out
• Compartmentation: stops fire and smoke spreading between zones of a building
• Compliance: Approved Document B sets minimum resistance periods for glazed elements in fire-separating constructions
• Insurance and liability: non-compliant glazing can void cover and expose you to enforcement action
• Property protection: slows structural damage and limits the spread of heat

What do the fire-resistance ratings on glass actually mean?

Fire-rated glass is classified by what it resists and for how long. The three performance classes you will see on BS EN 13501-2 test reports and specification sheets are:

• E (integrity): prevents flames and hot gases passing through for the rated period
• EW (integrity + radiation control): as above, plus limits radiant heat on the unexposed face
• EI (integrity + insulation): as above, plus limits the temperature rise on the unexposed face

The minute rating (30, 60, 90 or 120) follows the letter code. So EI60 means 60 minutes of both integrity and insulation. Approved Document B also references the REI notation, where R indicates load-bearing resistance — relevant for structural glazed elements.

EI is commonly required for escape routes because it limits heat transfer as well as preventing flame passage. E-only glazing may be restricted in area on some escape routes under Approved Document B tables.

Where in a UK building must you use fire-rated glazing?

The short answer: anywhere the glazing sits within a fire-separating element. Common locations include:

• Fire doors with vision panels in protected corridors, stairwells and lobbies
• Protected escape routes in flats, offices, schools and care homes
• Compartment walls between separate occupancies or fire compartments
• Staircase enclosures in houses with loft conversions (a frequent discovery during refurbishment)
• Façades and external walls where unprotected area limits apply under Approved Document B

The Regulatory Reform (Fire Safety) Order 2005 places a duty on the Responsible Person in non-domestic premises to maintain passive fire protection, including glazing. In practice, fire-rated glazing is often discovered to be missing or incorrectly replaced during refurbishment or a fire-risk assessment. If you are planning interior door replacements, it is worth checking whether any glazed panels fall within a fire-rated location before work begins; see this guidance on what to consider when replacing interior doors.

How is fire-rated glass tested and what proof should you ask for?

The two test standards you will encounter are BS 476 Part 22 (the historic British standard, still referenced for older installations) and BS EN 13501-2 (the current European classification system). For new applications, EN classifications should be specified; guidance indicates these will be mandatory in certain contexts.

Third-party certification gives you independent assurance that a product consistently meets its claimed rating. Look for:

• Certifire approval mark (a UKAS-accredited scheme)
• BSI Kitemark on the glass or its packaging
• Permanent markings on the glass itself: manufacturer name, product reference and test standard

The Glass and Glazing Federation recommends checking the glass for manufacturer markings and confirming test data with the supplier before installation. A certificate alone is not enough — the certificate must match the exact product and system being installed.

Pro Tip: Cross-reference the Certifire or BSI certificate number against the manufacturer’s published data sheet. The glass product name, thickness and system reference should match exactly. If they do not, the installation may fall outside the tested scope.

Documents to request from your installer or supplier before work starts:

• Test report reference (BS EN 13501-2 classification report)
• Third-party certification number (Certifire or BSI Kitemark)
• Manufacturer’s system reference and permitted dimensions
• Evidence of installer competence (training records or scheme membership)

Why ‘like-for-like’ glass replacement can invalidate fire resistance

This is the most common and most dangerous mistake. Fire-rated glass is not a standalone product; it must be installed as part of a complete, tested fire-resistant glazed system. The frame, glazing seals, beads and fixings are just as important as the glass itself. Substituting any single component can invalidate the entire fire rating.

Common errors that invalidate fire resistance:

• Substituting standard toughened glass for a rated product
• Using non-rated or incorrect glazing seals and intumescent strips
• Installing rated glass in a frame that was not part of the tested system
• Making on-site modifications to dimensions outside the tested scope
• Damaging intumescent components during fitting

The enforcement and insurance consequences are real. A building-control officer or fire authority inspector can require remedial work, and an insurer may decline a claim if non-compliant glazing contributed to fire spread. Your glazing compliance record directly affects your cover.

How often should you inspect fire-rated glazing?

Tie fire-rated glazing checks to your fire-door inspection cycle and your fire-risk assessment review. As a minimum, inspect annually. Three triggers require an immediate check regardless of schedule:

1. Refurbishment or building works near any glazed fire-separating element
2. A fire brigade visit or enforcement notice
3. An insurer instruction or insurance renewal survey

Inspection checklist

1. Confirm permanent markings are present and legible on the glass
2. Check intumescent strips and glazing seals for damage, compression or missing sections
3. Inspect the glass for cracks, chips or any sign of unauthorised replacement
4. Examine beads and fixings for looseness, corrosion or DIY alterations
5. Verify that no on-site modifications have been made to the frame or aperture size
6. Record findings in your passive fire protection survey log

Pro Tip: Intumescent seals can be damaged by ordinary cleaning products and minor impacts. Never use abrasive cleaners near glazing seals in fire-rated doors or screens, and flag any impact damage for professional assessment before the next inspection.

What are the practical trade-offs with fire-rated glazing?

Fire-rated glass costs more than standard glazing and typically carries longer lead times. The table below gives qualitative guidance to help you plan.

The thermal gap is worth planning for. If you are replacing glazing in a fire-rated location and energy performance matters, ask your installer about glazing options for energy efficiency that are compatible with the required fire classification. Some EI products can be specified with low-emissivity coatings, though the tested system reference must still be maintained.

What should you ask an installer before specifying the job?

A compliant specification needs more than a product name. Include these items in any tender or quote request:

1. Required classification (E, EW or EI) and duration in minutes
2. Full glazed-system reference: manufacturer, frame type and associated test report number
3. Permitted pane dimensions within the tested system
4. Confirmation that seals, beads and fixings are from the tested system
5. Third-party certification number (Certifire or BSI Kitemark)

Questions to ask your installer

1. Can you provide the BS EN 13501-2 test certificate for this exact system?
2. What is the manufacturer’s system reference, and does it cover these dimensions?
3. Are your installers trained or accredited for fire-rated glazing installation?
4. Can you provide traceable batch numbers for the glass supplied?

Documents to request at handover

• Certificate of conformity for the installed system
• Signed installation record confirming the system reference and dimensions
• Photographs of permanent markings on the installed glass
• Maintenance guidance from the manufacturer

Keeping traceable certificates and an installation sign-off at handover reduces liability and speeds any future insurer or building-control check.

Why Cloudy2Clear Windows treats fire-rated glazing as a system responsibility

The temptation when replacing a cracked or misted pane in a fire door is to treat it as a straightforward glass swap. In our experience, that approach is where compliance failures begin. A pane that looks identical to the original may carry no fire rating at all, and once it is fitted, the problem is invisible until an inspection or, worse, a fire.

Cloudy2Clear Windows has been repairing and replacing glazing in residential and commercial properties since 2005. That depth of experience means we understand that a fire-rated replacement is not just about the glass. It is about verifying the full system, supplying certified components, and handing over paperwork that stands up to scrutiny. Our types of safety glass guide covers the product landscape in detail for readers who want to go deeper.

Use the checklists in this article as your starting point, and contact us if you need an inspection or a compliant replacement quote.

Cloudy2Clear Windows: compliant fire-rated glazing from inspection to handover

Fire-rated glazing done properly means verified systems, certified glass, and paperwork you can keep on file. Cloudy2Clear Windows offers exactly that: inspection of existing fire-rated units, glass-only replacement within tested systems, full glazed-system installation, and compliance documentation at handover.

Our commercial window repair service is available to property managers and housing associations across the UK, with local branches covering areas including Milton Keynes and beyond. We operate Monday to Friday, 8:30am to 6:30pm. Start with an inspection, and we will tell you exactly what is needed before any work is quoted.

FAQ

Why specify fire-rated glass rather than standard toughened glass?

Standard toughened glass is impact-resistant but carries no fire rating. Fire-rated glass is a tested component of a fire-resisting system that maintains compartmentation and keeps escape routes usable for a stated period.

What is the difference between E and EI fire-rated glass?

E (integrity) prevents flames and hot gases passing through. EI (integrity plus insulation) also limits the temperature rise on the unexposed face, making it the required classification for most protected escape routes.

Does replacing one pane in a fire door need a full system check?

Yes. The Glass and Glazing Federation confirms that substituting any component, including the glass alone, can invalidate the fire rating of the entire glazed system if the replacement falls outside the tested specification.

How do I know if existing glazing is fire-rated?

Check the glass for permanent manufacturer markings showing the product name, test standard and classification. If the glass is unmarked in a location that requires fire resistance, treat it as non-compliant and arrange a professional inspection.

How often should fire-rated glazing be inspected?

At minimum, annually, aligned with your fire-door inspection cycle. Immediate checks are needed after any refurbishment, a fire brigade visit, or an insurer instruction.

Recommended

• Types of safety glass: a clear guide for homes and businesses 2026
• Window safety tips for businesses: compliance checklist
• Energy ratings for windows: your 2026 UK guide
• What is toughened safety glass? UK guide

Self-cleaning glass is a factory-coated glazing product that uses a two-stage process, photocatalysis followed by hydrophilic water sheeting, to break down organic dirt and rinse it away with rainfall. It genuinely reduces how often you need to clean certain windows, but it is not maintenance-free: it needs regular exposure to UV light and rain to work, and it will not touch limescale or mineral deposits. Products such as Pilkington Activ and SGG BIOCLEAN (Saint-Gobain) are the most widely available options in the UK market.

How does self-cleaning glass work?

The coating does two distinct jobs in sequence, and understanding both helps you judge whether it will work for your glazing.

Stage one: photocatalysis. The outer surface of the glass carries a thin layer of titanium dioxide (TiO2). When UV light from the sun hits this layer, it triggers a chemical reaction that breaks down organic deposits on the surface, things like pollen, algae, and general atmospheric grime. The dirt does not disappear instantly; it is loosened and degraded at a molecular level.

Stage two: hydrophilic sheeting. Once rain arrives, the same TiO2 coating causes water to spread across the glass in a thin, even sheet rather than forming droplets. That sheet carries the loosened particles down the pane and off the edge, leaving far fewer streaks than standard glass would show.

For the process to run effectively, three conditions must be met:

• Sufficient UV light (direct or indirect sunlight; deep shade reduces effectiveness)
• Rainfall or a deliberate rinse with a hose
• The coating must be on the outer face of the glass, exposed to the elements

A minimum installation pitch of approximately 10 degrees is generally required for water to run off properly. Windows set at a shallower angle, or those permanently under deep eaves, may never activate the coating fully.

Hydrophilic versus hydrophobic: what the product claims actually mean

Not all self-cleaning coatings work the same way. There are two principal approaches, and knowing the difference helps you read product datasheets with confidence.

Most products sold in the UK residential market, including Pilkington Activ and SGG BIOCLEAN, use the hydrophilic photocatalytic approach. The TiO2 coating is applied during manufacture as a permanent layer, not a retrofit film, so you cannot add it to existing glass. Upgrading means replacing the glass unit entirely.

Hydrophobic coatings are more common in specialist architectural or automotive applications. For a conservatory roof or a rooflight, the hydrophilic route is almost always the right choice.

Where is self-cleaning glass most useful?

Ranked by practical value, these are the locations where the technology earns its premium most reliably:

1. Conservatory roofs and rooflights. These are the strongest case. The glass sits at an angle, receives good UV exposure, and is genuinely difficult to clean safely without scaffolding or specialist equipment. Conservatory roof glazing is where most homeowners see the clearest payback.
2. High-level or inaccessible windows. Upper-storey windows on a three-storey property, or glazing above a stairwell, can cost significantly more to clean professionally. Self-cleaning glass reduces that frequency.
3. Commercial façades. Large glazed elevations on offices or retail units accumulate grime quickly. Specifying self-cleaning glass at build stage can reduce the commercial window maintenance burden considerably over a building’s lifetime.
4. South- and west-facing windows. Maximum UV exposure means maximum photocatalytic activity. These orientations get the most from the coating.

One practical note: frames, sills, and surrounding sealants still need manual attention. The coating covers only the glass surface itself.

What self-cleaning glass won’t remove, and how to care for it

The coating has clear limits. It cannot break down inorganic contamination, and that covers a wider range of deposits than most people expect.

Limescale from hard water, mineral staining, lead leaching from flashings, heavy paint or sealant residues, and thick bird fouling all require manual cleaning. The photocatalytic reaction only degrades organic material; inorganic particles simply sit on the surface until you remove them.

When manual cleaning is needed, use a pH-neutral, non-abrasive detergent and soft water where possible. Abrasive cloths, scourers, or harsh chemical cleaners can scratch or chemically degrade the TiO2 layer, shortening its effective life. Hard water can leave mineral deposits that physically block the coating and reduce its performance over time.

Pro Tip: During extended dry spells, the photocatalytic stage will still break down organic dirt, but without rain the loosened particles stay on the glass. A gentle rinse with a hose is all that is needed to complete the process. For a full routine, our window cleaning checklist covers the steps in detail.

After installation, ask your installer to confirm the first-rinse procedure. Some manufacturers recommend an initial rinse to remove any handling residues before the coating is considered fully active.

How long does the coating last, and what does it cost?

Manufacturers including Pilkington state that the coating is designed to last for the life of the glass under normal circumstances. Performance, however, depends heavily on cleaning methods and environmental exposure. Abrasive cleaning or persistent hard-water deposits can degrade it well before the glass itself fails.

Cost at a glance: The typical UK price premium for self-cleaning glass is roughly 15–30% above standard double glazing, or approximately £60–£120 per square metre extra. Always request itemised quotes from at least two installers before committing.

On warranty, ask three specific questions before you sign anything:

The payback case is strongest where professional cleaning costs are high or access is genuinely difficult. For a straightforward ground-floor window you can clean yourself, the premium is harder to justify.

Self-cleaning glass products available in the UK

Two products dominate the UK market and are the names you will encounter most often when specifying or buying:

• Pilkington Activ. Widely regarded as the original commercial self-cleaning glass, it uses a nanocrystalline TiO2 film approximately 15 nm thick. Pilkington publishes detailed technical datasheets and maintenance guides on its website, which are worth reading before specifying.
• SGG BIOCLEAN (Saint-Gobain). Saint-Gobain’s equivalent product, also based on a photocatalytic hydrophilic coating. UK availability is good through major glazing distributors.

When comparing products, ask for the relevant datasheet and check whether the product is tested to EN 1096-5, the European standard that allows specifiers to differentiate self-cleaning performance between coatings. This is particularly useful for commercial projects where performance claims need to be verified.

The coating is factory-applied and cannot be added retrospectively. If your existing windows are standard double-glazed units, upgrading to self-cleaning glass means replacing the glass unit entirely, not applying a film.

Questions to ask your installer before fitting self-cleaning glass

A few straightforward checks before you commit will save you from a costly mismatch between the product’s requirements and your glazing’s actual conditions.

1. Is the window sufficiently sun-exposed? Assess the orientation and whether nearby structures, trees, or overhangs will shade the glass for significant parts of the day.
2. What is the installation pitch? Confirm the angle is at or above approximately 10 degrees for effective water run-off.
3. How hard is your local water supply? In hard-water areas, mineral deposits will accumulate faster and require more frequent manual cleaning to maintain coating performance.
4. How often do you currently clean that window professionally? If the answer is once a year and access is easy, the premium may not pay back.
5. Ask your installer to confirm the coating is factory-applied, not a surface film, and to provide written warranty terms covering both the unit and the coating performance.
6. Ask about sealant and frame compatibility. Some silicone sealants can leave residues that affect the coating near the edges; your installer should specify compatible products.
7. Confirm disposal and recycling of replaced units. Responsible installers will handle this as part of the job.

Pro Tip: Self-cleaning glass works best as a targeted upgrade, not a blanket replacement for every pane in the house. At Cloudy2Clear Windows, we assess each window individually, looking at orientation, pitch, access difficulty, and local conditions, before recommending whether the upgrade makes practical sense. Our double glazing maintenance guidance covers what to check between professional visits.

When a failed or misted unit needs replacing anyway, that is the natural moment to upgrade to self-cleaning glass. The additional cost per unit is modest when you are already paying for a replacement.

Our view from the field

Self-cleaning glass genuinely earns its place in specific situations, and those situations are more common than many homeowners realise. Conservatory roofs, Velux-style rooflights, and high-level glazing on larger properties are where we see the clearest benefit: the coating reduces cleaning frequency, lowers the risk of access-related accidents, and can extend the intervals between professional cleans by a meaningful margin.

Where we are more cautious is on standard ground-floor windows in accessible locations. The premium is real, and if you can clean the glass yourself with a squeegee and a bucket, the payback period stretches considerably. The technology is sound; the question is always whether your specific glazing will give it the conditions it needs to perform.

Cloudy2Clear Windows has been assessing, replacing, and upgrading double-glazed units since 2005, across both residential and commercial properties. That experience tells us that the best time to specify self-cleaning glass is when a unit needs replacing anyway, not as a standalone retrofit project.

Ready to upgrade or replace your glazing?

Cloudy2Clear Windows handles glass-only replacements, conservatory and rooflight repairs, and commercial fenestration across the UK. If you have a misted, cracked, or failed unit and want to explore whether self-cleaning glass makes sense for your property, we can assess the glazing and provide a clear, itemised quote.

Whether you need a single pane replaced or a full conservatory roof upgrade, our team can advise on the right specification for your conditions. To book an assessment or request a quote for double glazing replacement, contact us Monday to Friday, 8:30am to 6:30pm.

Useful sources

• Pilkington: What is self-cleaning glass? — Manufacturer overview of the technology and product range; a good starting point for technical detail.
• Pilkington: How it works — Step-by-step explanation of the photocatalytic and hydrophilic stages from the original product developer.
• Pilkington: Self-cleaning glass FAQs — Covers warranty, maintenance, and performance questions in plain language.
• WindowCost: Self-cleaning glass UK guide — Independent UK cost estimates and practical limitations; useful for budgeting.
• Axiom Eco Homes: Is self-cleaning glass worth it? — Cost-benefit analysis with UK price premium data.
• Wikipedia: Self-cleaning glass — Neutral encyclopaedic overview of both hydrophilic and hydrophobic coating types.

FAQ

Does self-cleaning glass actually work?

Yes, for organic dirt on sun-exposed, rain-washed glazing. The photocatalytic coating breaks down grime and the hydrophilic surface rinses it away, but it will not remove limescale, mineral deposits, or heavy soiling without manual intervention.

Is self-cleaning glass a thing, or just a marketing claim?

It is a real, commercially available product. Pilkington Activ was the first commercial example and remains widely specified in the UK; SGG BIOCLEAN is the other major option available here.

How long does self-cleaning glass last?

Manufacturers state the coating is designed to last for the life of the glass unit under normal use. Abrasive cleaning or persistent hard-water deposits can degrade performance earlier, so gentle maintenance with a pH-neutral detergent is important.

How much more does self-cleaning glass cost?

The typical UK premium is roughly 15–30% above standard double glazing, or approximately £60–£120 per square metre extra. Get itemised quotes from at least two installers to compare accurately for your specific glazing.

Can Cloudy2Clear Windows fit self-cleaning glass?

Yes. When a unit needs replacing, Cloudy2Clear Windows can specify self-cleaning glass as part of a glass-only replacement. Contact the team Monday to Friday, 8:30am to 6:30pm, to discuss your glazing and get a quote.

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Upgrading to modern double or triple glazing with low-E coatings and argon gas fill is an effective way to significantly reduce window heat loss compared to single glazing. Beyond full replacement, several high-impact steps can make a real difference straight away:

• Repair failed seals — persistent internal condensation means the sealed unit has failed and must be replaced, not re-gassed.
• Draught-proof frames — small gaps around frames cause disproportionate heat loss through air leakage.
• Fit heavy lined curtains or secondary glazing — secondary glazing can reduce heat loss by 40–60%; heavy curtains can reduce heat loss by 25–40%.
• Manage ventilation — keep trickle vents clear to prevent condensation while reducing draughts elsewhere.

Pro Tip: If you can see fogging or moisture trapped between the panes, the sealed unit has failed. No amount of cleaning or re-gassing will fix it. The unit needs replacing.

Should you repair, replace, or use a temporary fix?

Start with a simple inspection before spending anything. Look for inter-pane condensation, draughts at the frame perimeter, warped or rotting frames, and failed rubber seals. What you find will point you towards the right route.

Persistent internal condensation or cracked glass means the sealed unit needs replacing. The inert argon gas has escaped and ambient air has taken its place; a failed seal cannot be restored and the unit will never regain its original insulating performance.

Draughts with intact glass often point to the frame rather than the glazing. Rotting timber, warped uPVC, or failed perimeter seals are common culprits. Replacing the glass alone will not cure a draughty window if the frame is compromised, so factor frame repairs into your decision.

Budget or conservation constraints may mean deferring full replacement. In that case, secondary glazing, window film, or heavy curtains are practical interim measures. Prioritise by room: north-facing bedrooms and commercial spaces with comfort requirements deserve attention before south-facing rooms that benefit from passive solar gain.

What do glazing upgrades actually cost, and what will you save?

Realistic cost and savings figures help you plan. The table below shows typical UK ranges based on current practice.

The Energy Saving Trust estimates that installing A-rated double glazing throughout a fully single-glazed semi-detached home can save around £140 a year on energy bills. For a property with ten windows at roughly £400 each, that puts simple payback at around 28 years on glazing alone — though comfort, noise reduction, and property value all factor into the real-world case.

Costs vary with window size, frame condition, installation complexity, and local labour rates. A glass-only sealed unit swap on an intact frame costs considerably less than a full frame replacement, which is why understanding what affects window efficiency before you get quotes is worth the time.

How does modern glazing actually reduce heat loss?

The performance of a window comes down to four selectable features. Knowing what they are helps you compare quotes with confidence.

• Low-E coatings — a microscopically thin metallic layer applied to the glass surface that reflects radiated heat back into the room while letting light through. The coating must face the correct direction; ask your installer to confirm orientation.
• Argon gas fill — argon between the panes conducts heat roughly 34% less efficiently than air, reducing conductive and convective losses across the cavity.
• Warm-edge spacers — the bar that separates the two panes. Aluminium spacers conduct heat readily at the edge, raising condensation risk. Non-metallic warm-edge spacers reduce thermal bridging at the perimeter and lower the chance of edge condensation.
• Frame material — uPVC offers good thermal performance and low maintenance; timber is excellent when well-maintained and suits conservation areas; aluminium conducts heat readily unless it incorporates a thermal break. Your choice should balance insulation, durability, and any planning constraints.

Double glazing with low-E and argon typically achieves U-values of 1.3–1.8 W/m²K; triple glazing can fall below 1.0 W/m²K in high-specification units. Single glazing sits at roughly 4.8–5.8 W/m²K, so the improvement is substantial.

Pro Tip: Always ask for written U-value evidence when comparing quotes. A lower U-value number means better insulation. If an installer cannot provide product data, treat that as a red flag.

No-cost to low-cost steps you can take today

Full replacement is not always the first step. Several measures cut heat loss immediately and cost very little.

Draught-proofing is the quickest win. Fit compression seals or brush strips to opening sashes, and use flexible silicone caulk to seal any gaps between the frame and the surrounding wall. Draughts from gaps can increase convective losses significantly, making this one of the highest-return low-cost measures available.

Thermal coverings work best when used consistently. Close heavy lined curtains at dusk and open them on sunny winter days to capture passive solar heat. Fitting a pelmet above the curtain rail stops warm air circulating behind the fabric and escaping upwards. Cellular blinds and removable window quilts add further insulation without permanent alteration.

Secondary glazing and window film suit properties where full replacement is restricted. Secondary glazing panels fitted inside the existing frame can reduce heat loss by 40–60% and are reversible. Self-adhesive insulating film is a cheaper short-term option, though it typically lasts one to three seasons before needing replacement.

One practical note: avoid blocking trickle vents permanently. They exist to provide background ventilation and prevent condensation. Use extractor fans after cooking or showering to manage moisture without sealing the building too tightly. For more on balancing airtightness with comfort, the guide to improving window insulation covers this in detail.

What does a professional glazing inspection cover?

A professional inspection goes well beyond looking at the glass. A qualified glazier will check:

• Sealed unit condition — fogging, cracking, or visible seal failure between panes.
• Frame integrity — rot in timber, warping in uPVC, corrosion in aluminium, and whether the frame is still square.
• Perimeter sealing — gaps between frame and wall that allow air infiltration.
• Hardware — hinges, handles, and locking mechanisms that affect how tightly the window closes.
• Ventilation provision — whether trickle vents are present, clear, and correctly sized.

Factory-glazed units with correctly sealed perimeters perform significantly better than poorly installed equivalents, so installation quality matters as much as the product specification.

Cloudy2Clear Windows handles glass-only sealed unit replacements where frames are sound, and full frame replacements where the frame itself is beyond repair. The service extends to conservatory and Velux glazing, commercial fenestration, and caravan windows. For housing associations and commercial clients, compliance checks and documented U-value evidence are part of the whole-opening improvements recommended for better energy efficiency. Installers should always provide FENSA registration or equivalent certification on completion.

How long does repair or replacement take?

Planning around timescales avoids unnecessary disruption.

Inspection and quote typically takes 1–5 working days, depending on access and whether a survey is needed for bespoke or conservation work.

Glass-only sealed unit replacement usually completes within 1–3 weeks. The unit is manufactured to the exact size of your existing frame, and on-site fitting for a standard window takes a few hours. Four standard house windows replaced with argon-filled low-E double glazing can realistically be completed in a single day once the units arrive, with minimal disruption to the household.

Full window replacement requires more lead time: allow 2–6 weeks for ordering, manufacture, and installation. Bespoke frames, heritage profiles, or conservation area requirements push timescales towards the longer end.

What Cloudy2Clear Windows has learnt from 20 years of glazing work

Most customers contact us after noticing draughts or condensation, often assuming the glass is the problem. In practice, our inspections frequently reveal that the frame is the primary issue: failed rubber gaskets, hairline gaps at the perimeter, or hinges that no longer pull the sash tight. Replacing the glass in a compromised frame is money spent twice.

Our recommendation is consistent: start with the rooms you use most and combine any glazing upgrade with draught-proofing for the best value. A well-sealed frame around a new low-E unit outperforms a premium triple-glazed unit sitting in a draughty frame. The double glazing benefits are real, but they depend on the whole installation being right.

Cloudy2Clear Windows can help you get this right

Misted panes, draughty frames, and failed seals are exactly what Cloudy2Clear Windows has been fixing since 2005. Rather than quoting for a full window replacement when only the glass has failed, we specialise in glass-only sealed unit replacement — a faster, lower-cost route that restores insulation without disturbing sound frames.

For commercial properties and housing associations, our commercial fenestration service covers compliance inspections, documented U-value evidence, and FENSA-registered installation across multiple sites. All work comes with guarantees, and we handle conservatory, Velux, and caravan glazing alongside standard residential windows.

To book an inspection or get a quote for a misted or failed unit, contact your local Cloudy2Clear Windows branch or visit the website to find the team nearest to you.

Useful sources

1. Energy Saving Trust — energy-efficient windows and doors: practical homeowner guidance on savings estimates and glazing ratings.
2. Centre for Alternative Technology — windows: holistic renovation guidance covering U-values, secondary glazing, and ventilation management.
3. GreenSpec — windows: heat loss and heat gain: technical reference for U-values, spacer types, and glazing performance data.

FAQ

What is the most effective way to reduce heat loss through windows?

Upgrading to double or triple glazing with low-E coatings and argon fill is the single most effective measure, significantly reducing heat loss compared to single glazing.

Can a misted double-glazed unit be re-gassed or repaired?

No. Once the seal fails and internal condensation appears, the unit cannot be restored by re-gassing. The sealed unit must be replaced to recover its insulating performance.

How much can I save by upgrading to A-rated double glazing?

The Energy Saving Trust estimates savings of around £140 a year for a typical semi-detached home previously fitted entirely with single glazing.

Do I always need to replace the whole window, or just the glass?

If the frame is sound, a glass-only sealed unit replacement is usually sufficient and costs considerably less than a full frame replacement. A professional inspection will confirm which is appropriate.

How quickly can a failed sealed unit be replaced?

Glass-only replacements typically complete within 1–3 weeks from inspection to fitting, with on-site work for a standard window taking just a few hours.

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Clear your weep holes twice a year, inspect seals and gaskets each spring and autumn, and book a professional if you spot misting between panes or soft timber frames. Those four actions cover the majority of double glazing failures before they become expensive. A structured annual check takes around 30 minutes per floor and costs almost nothing in materials.

Quick-action list for this season:

• Clear weep holes (the small slots at the bottom of the frame) with a cocktail stick or soft brush
• Check perimeter gaskets for cracks, shrinkage, or gaps
• Lubricate hinges and handles with silicone spray
• Look for misting or condensation between the panes of glass
• Note any rattling, sticking, or draught and photograph it

Pro Tip: Never use a pressure washer to clear weep holes. The force pushes debris further in and can dislodge the gasket. A dry brush or cocktail stick does the job safely.

What are the best seasonal window care tips for each season?

A season-by-season routine keeps double glazing performing well year-round. The tasks below are split by season and by frame material where the approach differs.

Spring

Spring is the most important season for window maintenance. Winter rain and freeze-thaw cycles stress seals and frames, so a thorough check now prevents summer problems.

• Clear weep holes: this is the single most critical task and should happen every spring and autumn
• Inspect gaskets for perishing or shrinkage along the full perimeter
• Wash uPVC frames with warm soapy water; use a pH-neutral cleaner on aluminium
• Lubricate all hinges, handles, and locking points with silicone spray
• Photograph any chips, cracks, or discolouration for your maintenance log

Summer

Heat causes uPVC to expand slightly, which can make sashes sticky or cause seal edges to lift. Check that every window opens and closes smoothly, and wipe down frames with a damp cloth to remove UV-degraded residue. Avoid dark-coloured cleaning cloths on light uPVC frames in direct sun; they can transfer heat and cause localised warping.

Autumn

Autumn is your second weep-hole clearance of the year. Leaf debris and wind-blown grit block drainage channels quickly. For timber frames, inspect for flaking paint or exposed wood and recoat before the wet season arrives. Timber frames need recoating every 3–6 years; catching bare patches in autumn prevents rot taking hold over winter.

Winter

Condensation on the interior glass surface is a ventilation issue, not a seal failure. Open trickle vents, run extractor fans in kitchens and bathrooms, and keep indoor humidity below 60%. If condensation appears between the panes, that is a failed sealed unit and requires professional attention. Apply temporary draught-proofing strips to draughty frames, but avoid covering weep holes or trickle vents.

How often should you inspect windows, and when do you need a professional?

A monthly visual check takes two minutes: look for obvious misting, cracks, or hardware that has stopped working. Twice a year, in spring and autumn, carry out a hands-on check that includes operating every window, pressing the frame for softness, and running a finger along the gasket.

Red flags that require a professional:

• Misting or condensation between the panes: this indicates a failed sealed unit and cannot be fixed by cleaning
• Cracked or loose glass in any pane
• Timber that gives under thumb pressure (internal rot)
• Pitting or structural corrosion on aluminium joints
• Broken handles, locks, or hinges that prevent secure closing
• Persistent rattling or audible draughts after draught-proofing
• Yellowing or cracked welds on uPVC corners

Which? identifies draughts, leaks, excessive noise, yellowing uPVC, and condensation between panes as clear signals to contact your installer or a qualified repairer.

Delaying professional attention when a seal has failed can reduce the window’s thermal efficiency by up to 50%, raising your heating costs and allowing moisture to reach the frame. The longer a failed seal is left, the wider the damage spreads.

Documenting faults for warranty or insurance:

1. Photograph the fault from two angles, with a ruler for scale where relevant
2. Note the date, weather conditions, and which window is affected
3. Record any previous repairs or maintenance carried out on that unit
4. Keep all receipts and correspondence with installers

Pro Tip: Date-stamped photos on your phone are accepted as evidence by most insurers and speed up professional triage during a site visit.

What cleaning methods and minor repairs can you safely do yourself?

Most homeowners can handle cleaning, lubrication, and simple gasket replacement without specialist tools. The key is knowing which materials to use and which actions to avoid.

DIY-safe tasks and correct materials:

• uPVC frames: warm water and a small amount of washing-up liquid; rinse thoroughly
• Aluminium frames: pH-neutral cleaner only; acidic or alkaline products cause pitting
• Timber frames: mild soap and water for cleaning; microporous paint for recoating bare patches
• Glass: a squeegee and clean water, or a proprietary glass cleaner without ammonia

Clearing weep holes (step by step):

1. Locate the small slots along the bottom of the outer frame
2. Insert a cocktail stick or soft-bristle brush and work debris loose gently
3. Blow or brush the loosened material clear; do not push it inward
4. Check the channel runs clear by pouring a small cup of water along the sill

Lubricating hinges:

Apply silicone spray to all moving parts, including hinges, locking points, and handle mechanisms. Oil-based lubricants attract dirt and cause mechanisms to seize over time; silicone spray is the correct product.

Perimeter gasket replacement is feasible on most uPVC windows: pull the old gasket from its channel, measure the profile, purchase matching rubber gasket from a glazing supplier, and press the new gasket in from one corner around the full perimeter.

Never attempt: pressure washing frames or weep holes, solvent-based cleaners on uPVC, drilling into sealed units, or adjusting the glazing beads without professional guidance.

Pro Tip: Photograph the gasket profile before removing it. The photo makes matching the replacement profile at a glazing supplier straightforward and avoids a wasted trip.

How do you winterproof windows and reduce condensation in the UK?

The UK’s damp winters make condensation management the most practical energy-saving step you can take. Ventilation control — using trickle vents and extractor fans consistently — reduces internal humidity and slows seal degradation.

Practical winterproofing steps:

• Keep trickle vents open, even in cold weather; they are sized to ventilate without significant heat loss
• Run kitchen and bathroom extractor fans during and for 15 minutes after cooking or bathing
• Apply self-adhesive foam draught-proofing strips to draughty casement edges; avoid covering weep holes
• Use a condensation prevention workflow to identify whether moisture is on the surface or between panes
• Consider internal shutters as an additional insulation layer; they also help with condensation control on cold nights

A failed window seal can reduce thermal efficiency by up to 50%, so replacing a blown unit before winter is one of the most cost-effective energy upgrades available. When a full replacement is due, A-rated or better double glazing units with improved U-values (1.6 W/m²K or lower for replacements under Part L) deliver measurable reductions in heat loss.

Pro Tip: Temporary draught-proofing strips cost under £10 and buy you a winter season while you arrange a professional quote. They are not a substitute for a failed seal, but they reduce discomfort while you plan.

What do window repairs and replacements cost in the UK?

Repair costs vary by fault type, frame material, and access. As a general guide:

• Hinge or handle replacement: around £80–£150 per pair
• Failed sealed unit (re-glazing): approximately £120–£250 per unit
• Gasket replacement: approximately £80–£150 per window
• Locking mechanism: approximately £100–£200 per window
• Full window replacement: typically £500–£1,200 per window depending on size and material

These figures are indicative; always obtain a written, itemised quote before committing. Lead times for minor repairs are typically 1–2 weeks; full replacement units may take 3–6 weeks depending on specification and supplier.

A useful decision rule: if the repair cost is less than 40% of the replacement cost and the frame is structurally sound, repair. If multiple units have failed, the frame is rotten, or the window is over 20 years old with recurring faults, replacement is the stronger long-term choice.

Pro Tip: Request at least two written quotes and ask each repairer to specify whether the price includes VAT, disposal of the old unit, and a guarantee on parts and labour.

Why trust this guidance, and where does Cloudy2Clear Windows fit in?

Cloudy2Clear Windows has been repairing and replacing double glazed windows across residential and commercial properties since 2005. The team carries out glass-only sealed-unit replacements, hinge and lock repairs, conservatory and Velux glass work, and compliance inspections for commercial and housing association properties.

Cloudy2Clear Windows has completed thousands of sealed-unit replacements and hardware repairs across the UK since 2005, working with homeowners, businesses, and housing associations to restore window performance without unnecessary full-frame replacement.

When you contact Cloudy2Clear Windows, you can request a written quote, a site visit, and documentation of the work carried out, including any warranty details. For further reading on spotting damage early, the guide on signs of window damage covers the most common indicators that seasonal wear has become a repair job.

Pro Tip: Ask any repairer whether they are FENSA-registered or work to equivalent standards. FENSA registration means replacement work is self-certified for Building Regulations compliance, saving you the cost of a separate inspection.

What Cloudy2Clear Windows technicians actually look for on a site visit

When a Cloudy2Clear Windows technician arrives, the first check is always the glass: is there misting between the panes, and is the sealed unit intact? From there, the frame is assessed for structural soundness, hardware is tested under load, and drainage channels are inspected. Health and safety on-site means no work is carried out on cracked or loose glass without securing the area first. Every job is documented with before-and-after photographs, and the customer receives a clear explanation of what was found, what was done, and what, if anything, needs monitoring.

Cloudy2Clear Windows: book a survey or request a quote

Cloudy2Clear Windows offers glass-only sealed-unit replacements, hinge and lock repairs, and commercial window repair services across the UK. Whether you need a single misted pane replaced or a full survey of a commercial property, the team provides written, itemised quotes with no obligation.

Branches cover Milton Keynes, Watford, Oxford, Leicester, Loughborough, Norwich, Bury St Edmunds, and surrounding areas. Operating hours are Monday to Friday, 8:30 AM to 6:30 PM. To book a site visit or request a quote for double glazing replacement or repair, contact your nearest branch directly. All completed work is documented and warranted, giving you a clear paper trail for insurance or future sale.

FAQ

How often should you clear window weep holes?

Clear weep holes at least twice a year, in spring and autumn. Blocked weep holes are one of the two most common preventable causes of seal failure and water ingress.

What does misting between window panes mean?

Misting between the panes means the sealed unit has failed. Surface cleaning will not fix it; the unit needs professional replacement, typically costing £120–£250 per unit.

Can you repair double glazing yourself, or do you need a professional?

Cleaning, lubrication, and simple gasket replacement are safe DIY tasks. Cracked glass, failed sealed units, rotten frames, and broken locking mechanisms all require a qualified professional.

How do you reduce condensation on windows in winter?

Keep trickle vents open, run extractor fans during and after cooking or bathing, and maintain indoor humidity below 60%. If condensation appears between the panes rather than on the surface, the sealed unit has failed and needs replacing.

When is it better to replace a window than repair it?

Replace when the repair cost exceeds 40% of the replacement cost, when multiple sealed units have failed, or when the frame is structurally unsound. A single failed hinge or seal on a sound frame is nearly always worth repairing first.

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