How much does it cost to insulate a loft?
Loft insulation is priced by loft area. Enter your loft footprint below — it's one of the cheapest ways to lift an EPC.
What loft insulation involves
- 1Measure the loft
Insulation is priced per m² of loft floor area — usually a bit less than the ground-floor footprint.
- 2Depth to 270mm
Current guidance is around 270mm of mineral wool; topping up thin existing insulation is cheaper than a full lay.
- 3Ventilation and boarding
Keep eaves ventilation clear; raised boarding to retain storage adds cost but avoids compressing the insulation.
Loft insulation is the classic quick EPC win — cheap, fast and low-disruption. On a refurbishment aimed at MEES compliance it's usually the first improvement to price in.
Loft insulation costs (indicative)
| Property | Loft area | Indicative cost |
|---|---|---|
| Flat / small | ~25 m² | £300 – £650 |
| 3-bed house | ~45 m² | £550 – £1,200 |
| Large / detached | ~70 m² | £850 – £1,900 |
| Per m² (270mm) | — | £12 – £30/m² |
Roll insulation to 270mm. Insulating a boarded loft or a room-in-roof costs more.
Frequently asked questions
How much does loft insulation cost?+
Loft insulation typically costs £12–£30 per m², so a 3-bed house (~45 m² loft) is roughly £550–£1,200. It's one of the cheapest ways to improve an EPC.
Does loft insulation improve the EPC?+
Yes — increasing loft insulation to the recommended depth is a low-cost, high-impact EPC improvement, which matters for lettings under minimum energy standards.
Related tools & guides
Want to know how these figures are calculated? See our cost methodology.
Cost figures shown are indicative estimates, not quotations. You are responsible for verifying all costs (obtain contractor quotes) and any figures submitted to a lender. ScopeWise is a documentation tool, not financial, tax, structural or planning advice. HMO compliance prompts are guidance only — confirm requirements with your local council, as standards and licensing vary by authority.