If your double glazing has started to fail — whether it's misting between the panes, a broken handle, or a draughty seal — the first question is always the same: how much does double glazing repair cost? The honest answer in 2026 is that most problems can be fixed for £60–£250, which is a small fraction of the £350–£800 you'd pay to replace the whole window. This guide breaks down every common double glazing repairs cost in the UK, when repair is the right call, and when it's worth going straight to replacement.
Prices below are based on jobs we've quoted across Southampton, Eastleigh, Portsmouth, Bournemouth, Fareham and Winchester in the last 12 months. They reflect what a homeowner can realistically expect to pay a reputable local installer — not the cheapest pop-up trader or the most expensive national brand.
Typical Double Glazing Repair Costs in 2026
Here's a rough guide to common double glazed window repair cost in the UK for 2026:
- Misted / failed sealed unit replacement: £60–£120 per unit (depending on size)
- Window handle replacement: £30–£60 per handle
- Window hinge replacement: £50–£90 per hinge pair
- Window lock repair/replacement: £40–£80
- Rubber seal replacement: £5–£15 per metre
- Door lock mechanism (multipoint): £120–£250
- Door alignment / adjustment: £60–£120
These are guide prices — actual costs depend on the specific parts, access requirements, and number of items being repaired. Note our £180 minimum job charge applies to all visits, so combining several small repairs into one call-out is always the most cost-effective approach. We always provide a fixed quote before any work begins.
Misted Window Repair Cost by Size (2026)
The single most-asked question we get is "how much is misted window repair?" Pricing scales with the size of the sealed unit, not the frame. Here's what to expect for a standard A-rated argon-filled replacement unit fitted into your existing UPVC frame:
- Small (up to 600 × 600mm — bathroom / WC): £60–£80 per unit
- Medium (up to 1000 × 1000mm — kitchen / bedroom): £80–£110 per unit
- Large (up to 1500 × 1200mm — living room casement): £110–£150 per unit
- Extra-large (above 1500mm — patio / picture window): £150–£250+ per unit
- Obscure, Georgian-bar or leaded units: add £20–£60
- Toughened or laminated safety glass: add £30–£80
On a typical 3-bed semi where 4–5 units have misted up, the all-in misted double glazing repair cost usually lands between £350 and £550 fitted in a single visit. That's roughly one-tenth the cost of replacing every window.
Full Replacement Costs
When repair isn't viable — for example, if UPVC frames are cracked, warped, or at the end of their lifespan — full window or door replacement becomes the better investment. Here's how much it costs to replace a double glazed window in 2026:
- Standard UPVC casement window: £350–£550 supplied & fitted
- Large UPVC casement / tilt & turn: £550–£800
- UPVC sash window (vertical slider): £700–£1,200
- UPVC bay window (3–5 sections): £1,200–£2,400
- Triple glazed upgrade: add 15–25% over standard
- UPVC door replacement: £500–£1,200 (supply & fit)
- Composite front door: £800–£1,800 (supply & fit)
- Full house window replacement (3-bed semi): £3,000–£6,000
- Full house (4-bed detached): £5,000–£9,500
Repair vs Replacement: Cost Comparison
For most homeowners the maths is simple — if the frames are sound, repair wins by a huge margin. Here's the typical saving per window:
- Misted unit: Repair £85 vs Replace £450 — save ~£365 (81%)
- Failed handle: Repair £45 vs Replace £450 — save ~£405 (90%)
- Dropped/sticking sash: Repair £70 vs Replace £450 — save ~£380 (84%)
- Broken hinge: Repair £70 vs Replace £450 — save ~£380 (84%)
- Perished rubber seals: Repair £60 vs Replace £450 — save ~£390 (87%)
When Should You Repair vs Replace?
Repair is usually the right choice when the frames are in good condition and only individual components have failed — a misted unit, a broken handle, a worn hinge, or a degraded seal. These repairs typically cost a fraction of full replacement and can add years of life to your existing windows.
Replacement makes more sense when frames are severely damaged, windows are 25+ years old, energy efficiency is a concern, or multiple components have failed simultaneously. Modern UPVC windows offer significantly better insulation, security, and noise reduction than older units.
At Restoration Glazing, we offer both services and will always give you honest advice on which option makes the most sense for your situation. We never push unnecessary replacements — but we won't recommend a repair if it's only a short-term fix.
Factors That Affect Cost
- • Window size: Larger units cost more for both glass and frames
- • Glass type: Standard vs low-e, self-cleaning, or acoustic glass
- • Access: Ground floor is cheaper than upper floors requiring scaffolding
- • Quantity: Doing multiple repairs or replacements in one visit is more cost-effective
- • Frame condition: Minor frame repairs add cost; severe damage may necessitate replacement
- • Location / access: Upper floors above the first storey may attract a small access surcharge
- • Lead time: Standard sealed units are typically fitted within 7–10 days; bespoke or shaped units 2–3 weeks
How to Get an Accurate Quote
The fastest way to get a real number for your double glazing repair cost — not just a range from a price guide — is to use our online calculator. It takes 60 seconds, asks for the dimensions and type of repair, and gives an instant fixed price including VAT. No call-back chasing, no salesperson visit.
If your job is more complex (multiple windows, awkward access, bay configurations) we'll do a free no-obligation site visit and confirm the price in writing before any work starts. We require a 50% deposit on booking and the balance on completion — no upfront surprises.
Frequently Asked Questions
How much does misted window repair cost in the UK?
Misted window repair costs in the UK typically range from £60 for a small bathroom unit up to £180 for a large living room window. The 2026 UK average is around £85 per unit fitted, including removal of the failed sealed unit and installation of a new A-rated argon-filled unit.
How much to replace a double glazed window in 2026?
Replacing a single double glazed window in 2026 costs between £350 and £800 supplied and fitted, with most standard casement windows landing around £450–£550. Larger bay windows, sash-style UPVC, or triple-glazed units can reach £900–£1,400 per window.
How much does it cost to repair a misted double glazed unit?
Misted or failed double glazed unit replacement typically costs between £60 and £120 per unit, depending on size. This replaces the sealed unit within the existing frame — much cheaper than replacing the whole window.
Is it cheaper to repair or replace double glazing?
In most cases, repairing individual components is significantly cheaper than full window replacement. However, if frames are severely damaged or windows are 25+ years old, replacement may be the more cost-effective long-term investment.
How long do repaired double glazing units last?
A professionally replaced sealed glass unit comes with a 5–10 year manufacturer warranty against seal failure, and in practice will last 15–20 years — the same lifespan as the original double glazing.
Is there a call-out fee for double glazing repairs?
Restoration Glazing operates a £180 minimum job charge, which covers the call-out, assessment, and standard repair work. There is no separate hidden call-out fee — the price quoted is the price you pay.
