By property
| Property | Loft floor area | Installed, wool to 270mm | DIY materials |
|---|---|---|---|
| Mid-terrace | 35–50 m² | £400 – £900 | £150 – £300 |
| Semi-detached | 50–70 m² | £450 – £1,600 | £200 – £450 |
| Detached | 70–110 m² | £700 – £2,200 | £300 – £650 |
| Bungalow | 70–100 m² | £700 – £2,000 | £300 – £600 |
By extra
- Raised boarding for storage: +£25–£45 per m² boarded. Boarding.
- Removing old insulation: +£300–£1,200. Removal.
- New hatch and ladder: +£250–£600.
- Pipe and tank insulation: +£80–£200.
- Rafter-level insulation instead of floor: see foil insulation cost and room-in-roof.
How these numbers were reachedCompiled from published UK cost guides and installer input, compiled and reviewed 3 September 2026. We will replace these with anonymised quote data from this site as it accrues. Methodology.
Get a quote for your loft, not a table
Get loft insulation quotesUp to two vetted installers, only if you ask.
Is it worth paying an installer?
For a clear, accessible loft, DIY is realistic and saves several hundred pounds. Pay an installer when the loft is awkward, has tanks and services to work around, needs old material removed, or when funding may cover it — funded work must be done by an approved installer.
Questions homeowners ask
Why does one quote say £500 and another £1,500?
Area, access and what is included. Ask each installer to state the area in m², the depth, whether old material is removed and whether pipes, tanks and the hatch are covered.
Is loft insulation free?
For eligible households under current schemes, it can be fully funded. Eligibility criteria apply. Who may qualify.
Sources and when they were last checked
- Checkatrade — Loft insulation cost guide — checked 2 September 2026
- MyBuilder — Loft insulation cost guide — checked 2 September 2026
- Energy Saving Trust — Roof and loft insulation — checked 2 September 2026