Roof Insulation Costs in the UK
Good roof insulation is one of the most cost-effective improvements you can make to your home. Whether you're having a new roof fitted or looking to improve insulation on its own, here's what you need to know about costs and benefits.
Insulation Costs by Type
| Type | Cost | Energy Saving |
|---|---|---|
| Loft Roll (between joists) | £300 – £600 | Up to 25% |
| Loft Roll (DIY) | £150 – £300 | Up to 25% |
| Between-Rafter Insulation | £1,500 – £3,000 | 15–20% |
| Spray Foam | £1,200 – £2,500 | 15–25% |
| Flat Roof Insulation | £500 – £1,500 | 10–20% |
Adding Insulation During a Roof Replacement
If you're already having your roof replaced, adding insulation at the same time is significantly cheaper than doing it separately. The roof is already stripped, making it easy to install between-rafter or above-rafter insulation. The additional cost is typically £500–£1,500 on top of the re-roofing price.
Government Grants and Schemes
Several schemes can help with insulation costs:
- ECO4 Scheme — free insulation for qualifying low-income households
- Great British Insulation Scheme — available to households in council tax bands A–D
- Local authority grants — many councils offer additional funding
- Energy company obligations — your energy supplier may offer free or subsidised insulation
Return on Investment
Loft insulation has one of the best returns on investment of any home improvement. At a cost of £300–£600 and annual savings of £150–£250, it typically pays for itself within 2–3 years. Over a 40-year lifespan, that's a potential saving of £6,000–£10,000.