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Install loft insulation.
270mm mineral wool or premium PIR loft insulation — cuts heat loss through the roof by 70%+.
✓ Updated Mar 2026✓ Free quotes✓ Vetted pros
20,000+UK homeowners
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Costs, timelines, pitfalls and the right questions to ask before any insulation starts on loft Insulation Installation.
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Itemised quotes from up to 3 local insulations on loft 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 into the corners blocks airflow, leading to roof timber rot and damp.
Compressed Insulation
Squashing 270mm of wool down to 100mm to fit floorboards reduces its effectiveness by over 50%.
Electrical Hazards
Covering cables or recessed lights can cause overheating and potential fire risks.
Uninsulated Hatch
Leaving the loft hatch bare creates a "chimney effect" where heat bypasses the new insulation.
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
Mid-Terrace (Mineral Wool)Standard 270mm depth
£450–£750
Semi-Detached (Mineral Wool)Top-up or full install
£600–£950
Large Detached (Mineral Wool)Includes pipe lagging
£900–£1.6k
PIR Rigid Board UpgradePer square metre
£40–£65
Loft Boarding (on stilts)Per square metre
£55–£85
!
Quote spread is typically ± 18% — always get 3 quotes.
At a glance
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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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