Foggy glass, a blown window pane or condensation between the panes? The lasting double glazing repair is a new sealed unit: we replace the failed unit with made-to-measure glass and keep your existing frame. Fixed price from £220 per unit, all in.
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Misted double glazing replacement means taking out a failed sealed glass unit, where moisture has got between the panes, and fitting a new made-to-measure unit into your existing uPVC or aluminium frame. It restores clear views and insulation without replacing the whole window.
At Window Fixers it costs from £220 per unit, including fitting and VAT. Most standard units are made in 3–5 working days and fitted in around 30–60 minutes.
Glass, fitting and VAT included
Typical lead time for standard units
Anti-fog cover on every new unit
No call-out charge, ever
If there is condensation between the double glazing that won’t wipe away from either side, the sealed unit has most likely blown. Send us a photo and we’ll confirm before you book.
Beads of moisture sit between the two panes, where no cloth can reach them.
The view through the window looks dull or blurred even after cleaning both sides.
The glass mists up between the panes as temperatures change, then clears later in the day.
A milky film builds up inside the cavity as moisture comes and goes.
Streaks or stains form inside the unit where trapped water has dried.
Wipe the glass inside and out. If the mist remains, the edge seal has failed.
We replace sealed units in uPVC and aluminium windows and doors. We don’t replace glass in timber windows and doors, single or secondary glazing, Velux windows or old aluminium sliding doors.
Fixed prices per sealed unit, supplied and fitted into your existing frame. VAT included and no call-out charge.
Misted or cloudy glass in uPVC windows. 3–5 days lead time.
Steamed-up door glass replaced with an A+ energy-rated unit. 5–7 days lead time.
Condensation inside French door glass, cleared for good. 3–5 days lead time.
Cloudy patio door glass, replacing the glass unit only. 5–7 days lead time.
| Glass type | Price per unit | Lead time |
|---|---|---|
| Standard window glass | From £220 | 3–5 days |
| Decorative or leaded glass | From £239 | 3–5 days |
| uPVC door glass | From £264 | 5–7 days |
| French door glass | From £299 | 3–5 days |
| Conservatory glass | From £299 | 5–7 days |
| Bifold door glass, toughened | From £599 | 5–7 days |
| Office glass, toughened or laminated | From £699 | 5–7 days |
| Sliding patio door glass | From £899 | 5–7 days |
| 3 or more glass units | 20% off |
Final prices depend on glass size and thickness, toughened or laminated safety glass, Low-E, obscure or Georgian and leaded designs, and access. Specialist, decorative, oversized or toughened units may take longer to make; we confirm the lead time when we quote.
Clear answers, fixed prices and no surprises.
WhatsApp or email the misted window, ideally with rough glass sizes. We send an initial quote, then arrange a free visit to measure and confirm the final price.
Your technician removes the failed sealed unit and fits a new made-to-measure unit in your existing frame. No mess, no damage to your surroundings.
Crystal-clear glass, better insulation and improved energy efficiency, backed by our 10-year anti-fog guarantee.
When you repair 3 or more glass units
Replace three or more misted sealed units at the same property and take 20% off the glass replacement price.
Save when you repair three or more.
Reduce draughts from faulty windows.
Smooth, secure window operation.
Eligible repairs include a warranty.
Standard repair pricing
Get 20% off eligible repairs
Applies when 3 or more glass units are replaced at one address.
Send photos or a short video on WhatsApp for your no-obligation repair quote.
Misted or blown double glazing rarely means new windows. We keep your serviceable frames and replace only the failed sealed unit.
We replace cloudy, foggy and failed double glazing in uPVC windows, doors, bifolds, patio doors and conservatories.
Every unit is made to measure, with energy-efficient, toughened, privacy and decorative glass available.
Clear prices from £220 per unit, agreed before we start. No call-out charge and no hidden extras.
If we can’t complete the agreed glass replacement, you don’t pay for it.
Every new double or triple glazed unit is covered against misting between the panes.
Fully insured technicians covering homes and commercial properties across London.
Recent jobs from homes across London, with what each one cost, all in.
Four double glazed units supplied and fitted, Ilford. £528 all in
Two blown units in a first-floor uPVC window, North London. £440 all in
uPVC patio door middle glass, West London. £599 all in
Aluminium bifold middle glass replacement, London. £599 all in
21 double glazed units in a uPVC conservatory, south-west London. £4,550 all in
uPVC French doors, both glass units replaced, south-east London. £600 all in
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Google reviews
Straight from our Google Business Profile, unedited. Real homes, real repairs and real replies from the team.
Based on 147 reviews on Google
Latest review 5 days ago
Abir Shahid
5 days ago
“Came and replaced my window hinges within an hour of contacting them. Fast and efficient service”
Window FixersResponse from the owner
Thank you so much for your lovely review! We’re really pleased we could get to you so quickly and replace your window hinges within an hour of your call. We always aim to provide fast, reliable and efficient window repair services. Thanks again for choosing us – we really appreciate your support!
S W
2 weeks ago
“Extremely professional and incredibly fast. A true window repair expert.”
Window FixersResponse from the owner
Thanks so much for the lovely feedback! Really glad we could get your window repair sorted quickly and that you were happy with the service. We always try to make things as easy and stress-free as possible for our customers. Thanks again for choosing Window Fixers, we really appreciate it!
Charming One
2 months ago
Have been using Glazie Ltd for all of my properties when there are window issues and they have never let me down! One phone call and they are on the case. Never get the feeling of being ripped off and always completed on time. I can honestly recommended them to anyone.
Window FixersResponse from the owner
Thank you so much for your continued trust and support! It really means a lot to know you’ve been happy with our window repair services across your properties. We always aim to respond quickly, do a proper job and keep our pricing fair and honest. It’s been a pleasure helping you over the years, and we’re always just a phone call away whenever you need us. Thanks again for recommending Glazie Ltd and Window Fixers!
Lesli
2 months ago
Appointment arranged for my convenience. A bit expensive but “Mr Luke”, who attended, methodically worked through to accurately diagnose the fault and rectify a tilt and turn window so well worth sorting to ensure working properly and secure. .
Window FixersResponse from the owner
Thank you for taking the time to share your experience! Really pleased to hear Luke was able to get your tilt and turn window working properly and securely again. We know window repairs aren’t always an expected expense, but we do our best to make sure the job is done properly and provides a lasting solution. We’ll be sure to pass your kind feedback on to Luke. Thanks again for choosing Window Fixers, we really appreciate it!
Jags Rayatt
3 months ago
This company is fantastic ! From booking the job to completion. I was told by an experience fitter of 20 years that I'd need a new door but this company came in and sorted my door hinges out and Luke gave me more advise regarding my door. I will definitely be using them again and recommending to all my friends and family
Window FixersResponse from the owner
Thank you so much for the fantastic review and for recommending us to your friends and family! We’re really pleased Luke was able to get your door working properly again by repairing and adjusting the hinges, especially after you had been advised that the whole door needed replacing. At Window Fixers London, we always aim to repair before replacing wherever possible, whether it’s faulty door hinges, locks, handles or alignment issues. It’s great to hear you were happy with the service from booking through to completion. Thank you again for choosing Window Fixers London, we’ll be happy to help whenever you need us in the future!
Bullchuck Bullchuck
3 months ago
“Amazing fast work good value for money. Highly recommended”
Window FixersResponse from the owner
Thank you so much for your fantastic review! We’re delighted you were happy with the fast service and great value. It was a pleasure helping you with your window repair. If you ever need window or door repairs in London, whether it’s a broken lock, faulty hinges, misted double glazing or any other issue, we’re always here to help. Thanks again for recommending Window Fixers London!
Niall McSheffrey
3 months ago
Very pleased with Luke's work, very clean efficient and professional. Had hinge replaced and two locks to my windows. I thought i needed 3 hinges but informed 2 were in good working order which saved me money. Thank you.
Window FixersResponse from the owner
Thank you so much for your wonderful review! We’re delighted to hear Luke provided such a clean, efficient and professional service. We always believe in honest advice, so we’re pleased we could save you money by only replacing the parts that genuinely needed changing. Thank you for trusting us with your window hinge replacement and window lock repairs. If you ever need reliable window and door repairs in London, we’d be more than happy to help again. We really appreciate your support!
Debra Leigh
3 months ago
Really pleased with the efficiency all round from booking & getting the job done - definitely recommend ⭐️
Window FixersResponse from the owner
Thank you for taking the time to leave such a lovely review! We’re really pleased to hear you were happy with the whole process, from booking through to completing the repair. Providing fast, reliable window and door repairs in London with great customer service is what we aim for every day. We truly appreciate your recommendation and look forward to helping you again if you ever need us.
Amy
5 months ago
Very quick response and arranged to come and do the fix the next day. Luke was fantastic and fixed our window on our second floor flat that others had refused to fix. Great quality repair and service thank you so much. I would highly recommend Window Fixers London!
Window FixersResponse from the owner
Thank you so much for your fantastic review and recommendation! We’re really pleased we could respond quickly and get your second-floor window repaired when others had been unable to help. Luke will be delighted to hear your kind feedback. We take pride in providing reliable window repairs in London, even for more challenging jobs, while delivering a high-quality repair and great customer service. Thanks again for choosing Window Fixers London—we’re always here if you need any window or door repairs in the future.
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We cover North, South, East, West and Central London, in homes, flats, rentals and commercial premises, with replacement units made to suit your existing frames. Not sure if we reach you? Send your postcode with your photos.
Can’t see yours? Send us a message and we’ll reply in minutes.
Standard misted double glazing replacement starts from £220 per unit, including fitting and VAT. Decorative glass starts from £239, uPVC door glass £264, French door and conservatory glass £299, bifold glass £599 and sliding patio door glass £899. Three or more units get 20% off.
If the mist is between the two panes and won’t wipe away from either side, the sealed unit has failed. Moisture has entered the cavity, causing the cloudy look known as misted or blown double glazing.
It is a common term for a failed sealed unit. The edge seal around the cavity has deteriorated and let moist air in, causing misting, fogging, droplets or staining between the panes.
Yes. A blown window pane is a double glazed unit whose edge seal has failed, so it mists up between the panes. We replace just that sealed unit with new made-to-measure glass in your existing frame, from £220 per unit, with a 10-year anti-fog guarantee.
Yes. For misted, blown or cracked glass, double glazing repair means replacing the failed sealed unit, which we do across London from £220 per unit. If the glass is fine but the window is stiff, dropped or won’t lock, see our uPVC window repairs.
The dependable long-term fix is to replace the failed sealed unit. Drilling or “defogging” the existing unit doesn’t recreate the original factory seal.
Usually not. If your uPVC or aluminium frame is in good condition, we remove the failed unit and fit new made-to-measure glass into your existing frame.
No. Condensation you can wipe from the room side is usually down to indoor humidity and ventilation. Condensation trapped between the panes means the sealed unit has probably failed.
Most standard sealed units are made within 3–5 working days; specialist, decorative, oversized or toughened units can take longer. Once made, many standard units are fitted in around 30–60 minutes.
Yes. Every replacement double or triple glazed unit comes with a 10-year anti-fog guarantee against misting between the panes, subject to our guarantee terms.
Yes. We replace misted glass in uPVC windows, French doors, uPVC doors, sliding patio doors, bifold doors, conservatories and office glazing, using safety glass where required.
WhatsApp us a photo of the whole window or door and the approximate glass sizes. We’ll send an initial quote, usually within 15 minutes in opening hours, and confirm the fixed price before work begins.
Condensation trapped between the panes means the unit’s edge seal has failed, and it can’t be wiped or dried out for good. The fix is to replace the sealed unit in the existing frame, from £220, with a 10-year anti-fog guarantee. Condensation on the room side of the glass is a ventilation issue instead; see our guide to window condensation.
