What you will pay for sash window work in the UK in 2026, from a new pair of cords to a fully replaced double-glazed window. All prices are per window and include fitting unless stated.
Repair and restoration prices
| Work | Typical price per window |
|---|---|
| Replacing sash cords | £50 to £160 |
| Freeing a stuck sash | from £100 |
| Basic repair and adjustment | £200 to £350 |
| Rot repair to frame or sash | £200 to £400 |
| Draught-proofing | £200 to £600 |
| Full restoration (overhaul) | £600 to £1,000 |
A full overhaul usually includes new cords, easing, timber repairs, draught-proofing and painting. Doing several windows at once normally brings the price per window down.
Replacement sash window prices
| Window type | Typical price per window |
|---|---|
| uPVC sash window | £600 to £1,200 |
| Aluminium sash window | £800 to £1,500 |
| Timber sash window (softwood to hardwood) | £1,000 to £3,000+ |
| Timber, listed building or conservation area | £1,500 to £3,000+ |
The Federation of Master Builders gives average double-glazed prices of around £805 to £915 for uPVC and £2,450 to £2,775 for timber, depending on size (600 x 900mm to 900 x 1200mm). Triple glazing adds roughly 15%.
Double glazing and secondary glazing
| Option | Typical price per window |
|---|---|
| New double-glazed timber sash window | £1,300 to £3,000+ |
| New double-glazed sashes in your existing frame | usually less than a full window; ask for a quote |
| Secondary glazing | from about £500 |
Slim and vacuum double glazing cost more per pane than standard units, but can often go into restored original sashes. See our guides to double-glazed sash windows and secondary glazing.
What affects the price
- Location. London and the South East cost more because labour rates are higher.
- Size and condition. Large windows, heavy rot and badly painted sashes take longer.
- Access. Upper floors may need scaffolding or a tower, which can add £100 to £200 or more.
- Materials. Hardwoods and Accoya cost more than softwood. Slim or vacuum glazing costs more than standard units.
- Heritage requirements. Listed buildings may need drawings, matching mouldings and handmade glass.
- VAT. Most firms quote including VAT. Check, because it adds 20%.
Ways to keep the cost down
- Repair before you replace. A restored window can last decades.
- Group the work so one visit covers several windows.
- Draught-proof at the same time as other repairs, while the sashes are out.
- Get at least three quotes and compare exactly what is included.
Sources
Prices compiled from Checkatrade (June 2026), MyBuilder (August 2026), the Federation of Master Builders (2026) and Everest (2026). Prices are a guide only. Always get a written quote.
