Cost guide
Sash Window Draught Proofing: What It Costs and How It Works
Draught proofing a typical Cheltenham sash window costs £250–£450 and takes a few hours per window. A discreet brush-pile seal is routed into the sash edges and beads, cutting air leakage by up to 80%, stopping rattles and reducing street noise — all without changing the window's appearance.
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What draught proofing actually does
Perimeter sealing closes the gaps around the meeting rail, staff beads, parting beads and sill without touching the external sightlines.
- Cuts draughts by up to 80%
- Stops rattles on windy nights
- Reduces street noise and dust
- Rooms feel warmer the same day
- No visible change to the window
- Fully reversible, so it's suitable for listed buildings
How the work is done
Step 1
Survey and measure
We check every gap, the paint condition and whether beads need replacing, then price sash by sash.
Step 2
Remove and ease
Sashes come out, paint build-up is eased from the runs and the meeting rail is cleaned.
Step 3
Rout and seal
A narrow groove is machined into the sash edges and a silicone-treated brush pile is set flush.
Step 4
Refit and rebalance
New beads carrying integral pile are fitted, cords checked and the sash rebalanced so it slides freely.
What moves your quote up or down
- Number of sashes — whole-house discounts apply
- Sash size and whether it's a bay or triple-sash unit
- Thickness of paint build-up that needs easing
- Whether staff and parting beads need replacing
- Choice of standard softwood or premium Accoya/Sapele beads
- Access — upper floors may need scaffolding or towers
Conservation areas such as Pittville, Lansdown and Montpellier often need exact profile matching, which can push a job toward the upper end. Accoya and Sapele beads cost more than standard softwood but carry far longer rot resistance. For a fixed written quote, book our draught-proofing service.
Sash Window Draught Proofing: What It Costs and How It Works FAQs
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