Restore crystal-clear views, improve insulation and eliminate condensation between the glass with our made-to-measure sealed unit replacement service across London.
If the condensation is trapped inside the glass rather than on the room side or outside surface, your window frames are often still perfectly serviceable. Replacing only the failed sealed unit is a faster, more cost-effective solution that restores your windows to their original clarity while saving thousands compared with full window replacement.
From £220
From £220
From £220
From £220
From £220
From £220
No Hidden Charges
Work Guaranteed
Energy Efficiency
Google Reviews
Please note: We do not replace glass in timber windows and doors, Single glazing, Secondary glazing, Velux windows and old aluminium sliding doors.
We'll identify whether your glass has failed and provide a fixed quotation before we visit.
Send a Photo or Video
Call Now
Send enquiries
Send a photo or video of the broken glass and receive a fast & free estimate from our team.
Send a photo or video
Talk to an expert
Send your enquiries
No Hidden Charges
Energy Efficient Glass
Work Guaranteed
Google Reviews
Please note: We do not replace glass in timber windows and doors, Single glazing, Secondary glazing, Velux windows and old aluminium sliding doors.
Local experts near you
On all repair work
Years of experience
5 - Star rated service
If you’ve noticed condensation inside your double glazing, a cloudy appearance, or your windows have become foggy between the panes, your sealed unit has most likely failed. This is commonly referred to as blown double glazing, misted double glazing, or a failed sealed unit. Because the moisture is trapped inside the insulated glass, no amount of cleaning will remove it from the inside of the window.
The good news is that in most cases, your window frame doesn’t need replacing. We simply replace the failed double glazed glass unit with a brand new, made-to-measure sealed unit, restoring crystal clear views, improving thermal efficiency and giving your windows a new lease of life. Every replacement glass unit is backed by our 10-year anti-fog guarantee, so you can enjoy complete peace of mind for years to come.
AUTUMN SPECIAL
Save 20% on 3+ Glass Replacements
When double glazing turns misty, cloudy or foggy between the panes, you shouldn’t automatically need new windows. Window Fixers specialises in replacing failed double glazed sealed units across London, keeping your existing frames wherever possible. From straightforward uPVC windows to patio doors, bifolds and decorative glass, we provide clear pricing, made-to-measure replacement sealed glass units and a 10-year anti-fog guarantee, so you get a long-term solution without paying for unnecessary window replacement.
Misted or blown double glazing rarely means a new window. We replace the failed sealed glass unit while keeping your existing frame.
Our replacement double glazed units are backed by a 10-year anti-fog guarantee against condensation between the panes.
Send us a photo of your misted glass for an initial quote. Clear pricing, no call-out charge and no hidden extras.
If we can't complete the agreed misted glass replacement, you won't pay for a repair we haven't successfully carried out.
Every replacement sealed unit is made to measure, with energy-efficient, toughened, privacy and decorative glass available.
We replace cloudy, foggy and failed double glazing in uPVC windows, doors, bifolds, patio doors and conservatories across London.
We make misted double glazing replacement simple, fast and hassle free. Clear answers, fixed prices and expert replacement, all with zero surprises.
Send us a Photo/Video
For an initial assessment, email or WhatsApp us a photo or video of your misted windows. We’ll assess the issue, provide an initial quote, then arrange a convenient free home visit to measure the glass and confirm the final price.
Expert installation, minimum fuss
Our specialist technicians remove the failed sealed unit and install a brand-new, made-to-measure double glazed unit in your existing window frame.
No mess. No damage to your surroundings.
Clear views & total peace of mind
Clear views & total peace of mind
Enjoy crystal-clear views, better insulation and improved energy efficiency. Every replacement glass unit is backed by our 10-year anti-fog guarantee.
Every replacement double or triple glazed sealed glass unit we supply and fit is backed by our 10-year guarantee against internal misting and condensation, giving you long term confidence in your new sealed glass units.
Misted or blown double glazing doesn't usually mean you need a whole new window. Where the frame is serviceable, we replace only the failed sealed glass unit saving money, reducing disruption and restoring a crystal-clear view.
Window Fixers specialises in misted and blown double glazing replacement across London. If condensation is trapped between the panes, we’ll replace the failed sealed unit with new made-to-measure glass while keeping your existing frame wherever possible. From uPVC windows and French doors to patio doors, bifolds and conservatories, we provide a professional glass-only replacement backed by our 10-year anti-fog guarantee.
Get clear answers about blown double glazing, condensation between the panes, replacement costs, lead times and our 10-year anti-fog guarantee.
If the mist or condensation is between the two panes of glass and you can’t wipe it away from either side, the sealed double glazed unit has most likely failed. Moisture has entered the cavity between the panes, creating the cloudy or foggy appearance commonly known as misted or blown double glazing.
Window Fixers solution: We can replace the failed glass unit while keeping your existing window frame.
Try wiping the glass from both inside and outside. If the condensation, mist, white haze or water droplets remain trapped between the panes, this is a strong sign of a failed sealed unit.
Send us a photo and we can usually identify the problem before arranging a visit.
“Blown double glazing” is a common term for a failed double glazed sealed unit. The edge seal that keeps the cavity between the panes sealed has deteriorated, allowing moisture laden air into the unit.
The result can be misting, fogging, cloudiness, internal droplets or staining between the panes.
The dependable long term solution is normally to replace the failed sealed glass unit. You usually don’t need to replace the complete window.
Some services advertise drilling or “defogging” the existing unit, but this doesn’t recreate the original factory sealed insulated glass unit.
Usually, no.
If your uPVC, aluminium frame is still in good condition, we can normally remove the failed double glazed unit and install new made-to-measure glass into your existing frame.
Energy Saving Trust specifically notes that when condensation develops between the panes, it may be possible to replace the double glazing rather than the entire window unit.
Replace the glass, not your windows.
At Window Fixers, standard misted double glazed glass replacement starts from £220 per unit, including fitting, subject to size, specification and access.
The final price depends on factors including:
Send us a photo for a quotation before we visit.
Double glazed sealed units don’t last forever. Failure can occur as the perimeter seal deteriorates through ageing, repeated temperature changes, installation conditions, frame movement or drainage related problems.
Once that seal is compromised, moisture can enter the cavity and the glass gradually becomes misted or cloudy.
Yes. Our replacement sealed glass units come with a 10 year anti-fog guarantee, giving you long-term protection against premature sealed-unit failure, subject to our guarantee terms.
No. This distinction is important.
If condensation can be wiped from the room-facing surface, it is usually related to indoor humidity, ventilation and the temperature of the glass not necessarily a failed sealed unit.
If the condensation is trapped between the panes and can’t be wiped away, the sealed unit has probably failed
External condensation isn’t normally a sign that your double glazing has failed.
In fact, Energy Saving Trust says condensation on the outside can be a sign that the windows are performing efficiently because less heat is escaping through the glass to warm the external pane.
Outside = usually normal.
Between the panes = likely failed unit.
A failed seal can reduce the effectiveness of the insulated glass unit. Energy Saving Trust states that double glazing letting air in between the panes reduces the window’s effectiveness.
Replacing the failed unit gives you the opportunity to restore the glazing and use modern energy-efficient glass without replacing a serviceable frame.
Normally, the complete sealed glass unit is replaced, rather than separating and replacing one of its panes on site.
Double glazing is manufactured as an insulated unit comprising multiple panes, a spacer system and perimeter seals. Your existing frame can usually remain in place.
Once your made-to-measure glass is manufactured, the actual replacement of a straightforward sealed unit can often be completed relatively quickly.
The old unit is removed, the glazing system and relevant frame condition are checked, and the new sealed unit is installed into your existing frame.
“Many standard units can be fitted in around 30–60 minutes, depending on the window, size and access.”
Most standard replacement sealed units are ready within approximately 3–5 working days, while specialist, decorative, oversized or toughened units may take longer. We’ll confirm the expected lead time when we quote.
Yes. Failed sealed units aren’t limited to ordinary windows.
Window Fixers can replace misted or blown glass in:
standard uPVC windows, French doors, uPVC doors, sliding patio doors, bifold doors, conservatories, office glazing and many other double glazed applications.
Safety glass specifications will be used where required.
The easiest way is to WhatsApp us a photo of the misted window or door.
If possible, include a photograph showing the entire window and the approximate glass dimensions. We’ll identify the likely glass specification and provide an initial quotation. Where further measurements or inspection are required, we’ll let you know.
No call-out charge. No fix, no fee. Fixed pricing confirmed before work begins.
See how our professional uPVC window repairs restore damaged windows without the cost of full replacements. Every project includes real customer photos, the repair completed and the final price paid.
Four double glazed glass units supply & fit in Ilford, London. Total cost £528 all in
Two blown glass units supply & fit in uPVC window first floor in North London, £440 inc VAT
uPVC patio door middle glass supplied and fitted in West London. £599 inc VAT
Aluminium bifold middle glass replacement in London. £599 inc VAT
21 double glazed glass replacements in uPVC conservatory in SW. £4550 inc VAT
uPVC French door both glass replaced in south east London. £600 in VAT
Window Fixers provides specialist misted double glazing replacement across London, helping homeowners, landlords, businesses and property managers restore cloudy, foggy and blown windows without unnecessarily replacing the complete window. Whether you have condensation trapped between the glass panes, a cloudy uPVC window, a blown patio door or failed double glazing throughout a property, we’ll manufacture replacement sealed units to suit your existing frames.
Our service covers North, South, East, West and Central London, with replacement glass backed by our 10-year anti-fog guarantee.
Looking for misted window repair near me or a reliable company to replace blown double glazing in London? Our engineers cover homes and commercial properties throughout London.
Our misted glass replacement service covers London boroughs including Barnet, Enfield, Haringey, Camden, Islington, Hackney, Waltham Forest, Newham, Redbridge, Barking & Dagenham, Havering, Greenwich, Lewisham, Southwark, Lambeth, Wandsworth, Merton, Croydon, Bromley, Sutton, Kingston upon Thames, Richmond upon Thames, Hounslow, Ealing, Hillingdon, Brent, Harrow, Hammersmith & Fulham, Kensington & Chelsea and Westminster.
Not sure if you're within our service area?
Send us a photo of your Misted. Cloudy. Foggy. Blown. Whatever you call it, we'll help make it clear again. Foggy to Fabulous — across London.
See why homeowners across London choose Window Fixers for professional misted double glazing replacement, clear pricing and results they’re happy to recommend.
Find answers, explore our services and see how we can help.
FAQs & Advice
Find answers to common questions and get expert help.
London & Kent
We cover all London boroughs and some areas in Kent.
Repairs & Pricing
Explore all our window and door repair services with fixed pricing.
Trusted by 100+
See what our customers say about our service and workmanship.
0208 064 1844
Technicians
Promise
Quality Service