Group G · Airtightness, thermal bridging and finishing
Draught-proofing
Sealing doors, windows, letterboxes, hatches, floorboards and unused chimneys — every home's quick win.
Price by property type
Draught-proofing
- Mid-terrace£250–£600
- Semi / end-terrace£300–£800
- Detached£450–£1,100
- Bungalow£300–£800
- Flat / block£200–£500
Before grants · updated 11 October 2026 · a survey confirms the final figure.
- Best for
- Every home; quick win
- Guarantee or standard
- Manufacturer's guarantee, confirmed in your quote
- Time on site
- Draught-proofing is usually done in a day.
- Typical price
- From £200
What it is
What is draught-proofing?
Sealing doors, windows, letterboxes, hatches, floorboards and unused chimneys — every home's quick win.
Best for: Every home; quick win.
Who it suits
Which homes is draught-proofing suitable for?
Is my home suitable?
Pick your property type for a straight answer on draught-proofing.
Guidance only — every home is different, and a survey confirms what suits yours.
Houses
- Detached house
- Semi-detached house
- End-of-terrace
- Mid-terrace
- Townhouse
- Mews house and cottage
- Detached bungalow
- Semi and terraced bungalow
- Chalet and dormer bungalow
- Period home
- 1930s home
- Post-war and ex-council house
- Non-traditional / system-built
- Listed building or conservation area
- Farmhouse, barn conversion or rural home
- New build or self-build
- Park and mobile home
Flats and blocks of flats
Commercial and public buildings
Usually suitable Depends — a survey confirms
Materials and brands
What we use
Doors, windows, letterboxes, loft hatch, floorboards, skirting, unused chimneys (chimney balloons and caps).
Insulation brands we work with
- Knauf Insulation (Earthwool, Supafil blown)
- Rockwool
- Superglass
- Isover
- Kingspan
- Celotex
- Recticel
- Xtratherm
- Steico wood-fibre
- YBS and Actis multifoil
The exact system and brand for your home are confirmed in your written quote.
Heat, bills and EPC
What it does for your heat loss, bills and EPC
Draughts carry warm air straight out of a home, and thermal bridges create cold spots where heat bypasses the insulation. Sealing and fixing them reduces heat loss and makes rooms feel warmer, while controlled ventilation keeps the air healthy and the fabric dry.
See the EPC points and savings for your home in the EPC plannerU-value before and after, typical heat and bill saving, and EPC points — worked out for your property.Price
How much does draught-proofing cost?
Prices change with your property type. Pick your column — the quote builder then refines it for your home.
| Measure | Mid-terrace | Semi / end-terrace | Detached | Bungalow | Flat / block |
|---|---|---|---|---|---|
| Draught-proofing | £250–£600 | £300–£800 | £450–£1,100 | £300–£800 | £200–£500 |
Indicative ranges for London and the South East, supplied and installed, including VAT, before grants. Updated 11 October 2026. A survey confirms your final price.
0% VAT on energy-saving materials
Insulation, solar panels, batteries and heat pumps installed in homes in Great Britain are zero-rated for VAT until 31 March 2027. Windows and doors are not included.What to expect
Time on site, disruption and approvals
Time on site
Draught-proofing is usually done in a day. Airtightness, thermal bridging and ventilation work is scheduled with the main retrofit.
Disruption
Low for draught-proofing; higher where floors, linings or ceilings are opened up.
Planning and building control
Ventilation must meet Building Regulations Part F, fire-stopping follows Approved Document B, and funded whole-house retrofit follows PAS 2035.
Guarantee and standard
Manufacturer's guarantee, confirmed in your quote.
60-second grant check
Could a grant help pay for it?
Grant eligibility checker
About 60 seconds · plain results: likely, possibly or not eligible
Before we start
What type of property is it?
Questions
Draught-proofing: your questions answered
How much does draught-proofing cost?
Typical installed prices in London and the South East, including VAT and before any grant: £250–£600 for a mid-terrace; £300–£800 for a semi-detached or end-of-terrace house; £450–£1,100 for a detached house; £300–£800 for a bungalow; £200–£500 for a flat. Prices updated 11 October 2026. A survey confirms your final figure.
What does draught-proofing include?
Sealing gaps around doors and windows, letterboxes, the loft hatch, floorboards and skirtings, and unused chimneys with chimney balloons or caps.
Is draught-proofing worth it?
It's one of the lowest-cost improvements and makes rooms feel warmer quickly — a quick win for almost every home.
Can I draught-proof a room with a gas fire or open-flued boiler?
Rooms with open-flued appliances need their air supply, so we never block required ventilation and check combustion air before sealing.
Can you draught-proof sash windows?
Yes — draught-proofing sashes is a common upgrade for period homes that keeps the original windows.
Group G
More in airtightness, thermal bridging and finishing
Thermal bridging fixes
Insulated lintels, reveal and cill insulation and thermal breaks that stop cold spots and mould.
Airtightness works
Membranes, tapes, grommets and sealants at joints, service holes and floors.
Pipe, tank and cylinder insulation
Pipe lagging, cylinder jackets, radiator reflector panels and loft tank insulation.
Acoustic insulation
Sound insulation in floors, party walls and ceilings.
Fire-stopping and cavity barriers
Cavity barriers and fire-stopping installed with EWI, cavity and loft works.
Ventilation with insulation
Trickle vents, extract fans, PIV or MVHR so a better-sealed home stays dry.
Begin your project
Price draught-proofing in two minutes
See a price range for your property type, with grants and 0% VAT applied where they fit. A survey always confirms the final figure.