Updated 25 September 2026
Sash window draught-proofing cost UK 2026
The going rate for sash window draught-proofing in 2026 is £200–£400/window (total, ex VAT). Below: a calculator, what the job involves, materials at three price levels, and the prep that changes the price.
Market band£200–£400/window
Worked example, 2 window£619
Time on site1.25 days
Sash window draught-proofing calculator
Price a real job freeUses your rates, your speed and your receipts.
Market band source: Trade2Base.
What the job involves
| Stage | Task | Typical time |
|---|---|---|
| work | Ease, seal and rehang sashes | 5 h per window |
Materials at three price levels
| Material | Budget | Trade choice | Premium |
|---|---|---|---|
| Sash draught-seal kit per window | £25 Brush seal and new cords — Stops rattles and draughts | £40 Routed brush and staff beads — Neat, lasts | £60 Full parting-bead system with new pulleys — Smooth running |
Trade prices ex VAT, estimates checked 2026-09-25. Log your receipts in Grafto and your own prices replace these.
What changes the price
- Thick old paint? no · yes
Good practice
- Lived-in home: time for dust sheets and moving furniture
Prep to look for
| Condition | Check | Effect |
|---|---|---|
| Rotten timber | soft, dark or flaking sills, frames or skirting | Cut out and splice rotten section |
| Possible lead paint | Thick, layered old paint on pre-1960 joinery? | Lead-safe paint prep. Possible lead paint: lead-safe prep, no dry sanding |
Questions
How much does sash window draught-proofing cost in the UK in 2026?
The researched market band is £200–£400/window (total, ex VAT), from Trade2Base. A worked example of 2 window comes to about £580–£669 across budget, trade and premium materials.
How long does sash window draught-proofing take?
The worked example of 2 window takes about 1.25 working days.
What changes the price of sash window draught-proofing?
Mainly size and access, plus any prep found on site: rotten timber, possible lead paint.