Who we help · Flats and blocks of flats
HMO and student housing
Usual measures: Loft, IWI, fire-safe EWI, acoustic insulation. Watch-out: HMO licence and MEES for landlords.
Typical prices
Semi / end-terrace prices
- Loft insulation (new or top-up)£600–£1,300
- Internal wall insulation (whole home)£10,000–£20,000
- External wall insulation + render£14,000–£24,000
Before grants · updated 11 October 2026 · a survey confirms the final figure.
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Construction, heat loss and watch-outs
- Typical construction
- Mixed
- Where heat is lost
- Walls, roof
- Usual measures
- Loft, IWI, fire-safe EWI, acoustic insulation
- Watch-outs
- HMO licence and MEES for landlords
EPC C by October 2030
Private rented homes must reach EPC C by October 2030, with a cost cap of £10,000 per property. A portfolio EPC C plan shows the route for each home.Recommended
The insulation we usually recommend
Loft insulation
Mineral wool laid between and across the joists to 270–300 mm so heat stays in the rooms below.
Internal wall insulation (IWI)
Insulated plasterboard or stud systems fitted inside solid walls where the outside must not change.
External wall insulation (EWI)
A complete certified build-up of insulation board, mesh and render from one system holder.
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.
Prices
Semi / end-terrace price column
| Measure | Semi / end-terrace |
|---|---|
| Loft insulation (new or top-up) | £600–£1,300 |
| Loft clearance and replacement | £1,500–£3,000 |
| Room-in-roof | £4,000–£9,000 |
| Cavity wall insulation | £1,200–£2,500 |
| Cavity extraction and refill | £3,500–£7,500 |
| Internal wall insulation (whole home) | £10,000–£20,000 |
| External wall insulation + render | £14,000–£24,000 |
| EWI with brick slip finish | £18,000–£32,000 |
| Re-render only (K Rend silicone) | £6,500–£12,000 |
| Suspended floor insulation | £1,500–£4,500 |
| Draught-proofing | £300–£800 |
| Whole-house fabric package | £22,000–£45,000 |
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.Begin your project
Price insulation for your hmo and student housing
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.