Draught-Proofing Cost UK (2026)
Last updated 5 October 2026 · Prices based on the Ofgem price cap (October 2026 – December 2026)
Draughts let warm air escape and cold air in. Sealing the gaps around doors, windows, floors and chimneys is the cheapest efficiency upgrade available and something most people can do themselves in a weekend.
Draught-proofing cost payback calculator
At £200 net cost and £90 saved a year, it pays for itself in about 2.2 years.
- Net cost
- £200
- Payback
- 2.2 yrs
- 10-year saving
- £700
Simple payback = (cost − grant) ÷ annual saving, at today's price cap (26.32p electricity, 7.97p gas). Ignores future price changes.
Draught-proofing costs by area
| Area | DIY cost | Professional | Typical saving |
|---|---|---|---|
| Doors (strips, brushes) | £20–£50 | £60–£120 | £15–£25 |
| Windows (strips) | £30–£80 | £100–£250 | £20–£40 |
| Floorboards and skirting | £40–£100 | £150–£350 | £20–£40 |
| Chimney balloon or cap | £25–£40 | £80–£150 | £15–£30 |
| Loft hatch | £10–£25 | £50–£80 | £5–£10 |
What affects the cost
Number of gaps
Older homes tend to have more.
Floor type
Suspended timber floors are the biggest draught source.
Chimneys
Unused open chimneys lose a lot of heat.
Ventilation
Never block trickle vents, airbricks or extractor fans.
How to reduce the cost
- Use a lit incense stick to find draughts
- Fit a letterbox brush and keyhole cover
- Seal gaps under skirting with silicone
- Use a chimney balloon in unused fireplaces
- Keep trickle vents open to prevent damp
Frequently asked questions
How much can draught-proofing save?
Around £50–£125 a year for a typical home.
Can draught-proofing cause damp?
Only if you block intentional ventilation. Keep vents and extractor fans working.
Can renters draught-proof?
Yes — most products are removable and cheap.
Sources and methodology
Energy prices come from the Ofgem price cap for Direct Debit customers (GB average). Installation costs are typical UK ranges from installer quotes and industry guidance, rounded. Savings use today's rates and do not predict future prices.