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Insulate your roof.
Pitched roof at rafter level (warm roof) or ceiling level (cold roof) — sized to current Part L.
✓ Updated Mar 2026✓ Free quotes✓ Vetted pros
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Costs, timelines, pitfalls and the right questions to ask before any insulation starts on roof Insulation Installation.
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Itemised quotes from up to 3 local insulations on roof Insulation Installation — so you can compare like-for-like, not lump sums.
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Top tips
Hiring a insulation, without the regret.
Four moves that separate a smooth job from a nightmare.
Blocked Eaves
Pushing insulation right into the corners can block airflow, leading to structural rot and mould.
Compressed Insulation
Squashing 270mm of wool under floorboards for storage reduces its effectiveness by up to 50%.
Thermal Bridging
Leaving gaps between rigid boards or around joists allows heat to escape rapidly.
Unprotected Downlights
Covering halogen or LED downlights with insulation is a fire hazard; they must have "loft caps" or fire-rated covers.
Costs & timeline
Know what it costs. Know when it ends.
Indicative UK ranges and what affects price.
Cost range
By job type
Inc. VAT · 2026
Source: NMT quotes
Source: NMT quotes
Glass/Mineral Wool (per m²)Standard 270mm thickness.
£6–£12/m²
Rigid PIR Boards (per m²)Higher R-value for rafter installs.
£25–£50/m²
Full 3-Bed Semi (Loft Floor)Total project cost inc. VAT.
£600–£1.1k
!
Quote spread is typically ± 18% — always get 3 quotes.
At a glance
Infographic · VideoThe Insulation briefing.
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Insulation explained
This guide was written with AI assistance and is intended for general information only. Prices are estimates based on UK averages and may vary by region. Always get at least three quotes and consult a qualified professional before starting any work.
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