Who we help · Houses
Farmhouse, barn conversion or rural home
Usual measures: Breathable IWI, roof, floor, heat pump, solar. Watch-out: Oil and LPG homes: biggest bill savings.
Typical prices
Detached prices
- Internal wall insulation (whole home)£15,000–£30,000
- Suspended floor insulation£2,500–£6,500
Before grants · updated 11 October 2026 · a survey confirms the final figure.
At a glance
Construction, heat loss and watch-outs
- Typical construction
- Stone, timber, off-gas-grid
- Where heat is lost
- Walls, roof, oil heating
- Usual measures
- Breathable IWI, roof, floor, heat pump, solar
- Watch-outs
- Oil and LPG homes: biggest bill savings
Recommended
The insulation we usually recommend
Breathable IWI for period homes
Wood-fibre, cork or hemp-lime systems that let solid walls stay dry.
Pitched roof insulation from inside
Insulation between and under the rafters to turn a cold loft into a warm one.
Warm roof (over-rafter) insulation
Rigid insulation laid over the rafters while the roof is being replaced.
Suspended timber floor insulation
Mineral wool or rigid board between the joists with an airtight membrane.
Solid floor insulation
PIR or XPS boards over the slab with a new screed or floating floor.
Wood-fibre insulation
Breathable boards and batts with good summer heat protection and low carbon.
Prices
Detached price column
| Measure | Detached |
|---|---|
| Loft insulation (new or top-up) | £900–£1,800 |
| Loft clearance and replacement | £2,000–£4,000 |
| Room-in-roof | £5,500–£12,000 |
| Cavity wall insulation | £2,000–£3,500 |
| Cavity extraction and refill | £6,000–£11,000 |
| Internal wall insulation (whole home) | £15,000–£30,000 |
| External wall insulation + render | £20,000–£35,000 |
| EWI with brick slip finish | £26,000–£45,000 |
| Re-render only (K Rend silicone) | £9,000–£18,000 |
| Suspended floor insulation | £2,500–£6,500 |
| Draught-proofing | £450–£1,100 |
| Whole-house fabric package | £35,000–£70,000 |
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.
Grants and savings that may help
- ECO4Closes in 73 days
Up to fully funded; paid by energy suppliers per measure
Grant via local councils (£960m nationally in 2026/27)
- Social Housing Fund
Landlord-led bids
Saves 20% VAT
- Local schemes
Varies
Eligibility depends on your circumstances and is confirmed by evidence and the funder or council.
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.Houses
Other property types
- 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
- New build or self-build
- Park and mobile home
- Every property type
Begin your project
Price insulation for your farmhouse, barn conversion or rural home
See a price range for your property type in two minutes, with grants and 0% VAT applied where they fit. A survey always confirms the final figure.