Windows · repairs
Replacement glass units
When condensation appears between the two panes of glass, the seal on that unit has failed. You don't need a new window: the glazier measures the unit, has a new one made, and swaps it into the existing frame on a second visit, usually in under an hour.
Is it right for your home?
Suits
- Misted or blown double glazing
- Cracked or broken panes in a sound frame
- Upgrading old units to better glass
Good points
- A fraction of the cost of a new window
- The frame, colour and handles stay as they are
Watch out for
- Only worth it if the frame is in good order
- Two visits: one to measure, one to fit
What replacement glass units cost
Replacement glass units typically cost £90 (one misted sealed unit in a mid-sized window), with most jobs between £50 and £200. That includes VAT at 20%. Fitting takes 1–2 hours on site.
What you would actually pay
Typical one misted sealed unit in a mid-sized window · UK- Typical installed cost Replacement glass units, supplied and fitted
- £75
- VAT at 20% Standard rate
- £15
- Net cost to you
- £90
If you borrowed £90.00 over 36 months at 0.0%, it would cost £2.50 a month – £90.00 in total, of which £0.00 is interest.
Illustration only – not a quote, not an offer of credit, and not financial advice. Rates depend on your circumstances and creditworthiness.
Where the money goes
| Element | Typical range |
|---|---|
| Sealed unit A new double glazed unit made to the size of the old one, with a warm edge spacer. | £40 – £130 |
| Fitting Removing the beads, swapping the unit and refitting the beads. | £20 – £70 |
Guide prices including VAT. Your actual cost depends on your home, access and specification.
What moves the price
- Size
A small fanlight unit costs a fraction of a large picture pane. Several on one visit bring the price per unit down.
- Glass type
Toughened, laminated, obscure and leaded units cost more. Glass in doors and low windows must be toughened.
- Guarantee
Check whether the window is still under its original guarantee before paying, as many cover the sealed units for ten years.
What should be in a quote
If a quote is missing any of these, ask why before you compare it with another.
- The size and specification of each unit, including toughened glass where needed
- Whether there is a call-out or measuring charge
- The guarantee on the new units
- Whether the price is per unit or for the job
Prices by region
Labour is most of the difference. Typical price (one misted sealed unit in a mid-sized window), including VAT.
| Region | Typical | vs UK average |
|---|---|---|
| London | £110 | +25% |
| South East | £110 | +17% |
| South West | £100 | +10% |
| East of England | £100 | +6% |
| West Midlands | £90 | +4% |
| Scotland | £90 | +2% |
| East Midlands | £90 | UK average |
| Yorkshire and the Humber | £90 | UK average |
| North West | £90 | −2% |
| North East | £90 | −5% |
| Wales | £80 | −6% |
| Northern Ireland | £80 | −12% |
Common questions
Can misted double glazing be fixed without new glass?
Demisting services drill and dry the unit, but the result rarely lasts and the insulation does not come back. A new unit is the proper fix.
Why has my double glazing misted?
The seal around the edge of the unit has failed and moist air has got in. It is common in units that are fifteen years old or more.
Get quotes for your home
A guide price only takes you so far. Local firms can price the work on your own home, and comparing a few quotes is the quickest way to see what is reasonable.
Compare free quotes