PRICE GUIDE · TRADES & CONSTRUCTION · 2026–2027
Loft Insulation cost in the UK
£300–£1,500 per job. Typically £950.
Professional loft insulation costs £300–£1,500 in the UK, with about £950 typical for a full install. Topping up thin insulation in a small loft is cheapest; a large loft, blown fibre for awkward eaves, or boarding over the insulation for storage brings the price up.
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HOW MUCH IT COSTS
How much does loft insulation cost in the UK?
| Low end | £300 | a top-up in a small loft |
|---|---|---|
| Typical | £950 | what most people pay |
| High end | £1,500 | a large loft insulated and boarded |
Locufy guide prices for 2026–2027. Updated 2026. A national range, not a quote — enter your town above for real prices from the builders and trades near you.
What moves the price
- Loft size — a terrace or flat-roofed bungalow loft needs far fewer rolls than a large detached house
- Top-up or full install — adding a layer over existing insulation is cheaper than starting from bare joists
- Insulation type — mineral wool rolls are cheapest, while blown fibre and rigid boards cost more
- Boarding for storage — raised loft boarding keeps the insulation at full depth but adds to the job
- Access and clutter — a full loft or a tight hatch slows the installer down
- Grant eligibility — households on certain benefits may get loft insulation funded through ECO4
Building and repair prices in the UK are up 6% over five years (ONS Consumer Price Inflation, Services for maintenance and repair, to 2026 August). Five years ago a typical loft insulation would have cost about £900 — an estimate from today's guide price and that index, not a recorded price. Source: ONS MM23 D7DO →
WHAT YOU GET
What a loft insulation booking includes
Takes: Half a day to a day for most lofts, longer with boarding. Not included: Clearing a cluttered loft, raised boarding, new loft ladders and electrical work are usually priced separately — see the related guides below.
WHAT PEOPLE BOOK
Common loft insulation jobs
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Loft Insulation near you, with prices shown
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How to pay less
- Check ECO4 and the Great British Insulation Scheme before paying, as loft insulation may be funded
- Clear the loft before the installer arrives so the paid time goes on insulation
- Have loft insulation laid at the same time as any loft boarding or roof work, so the installer visits once
Before you book
- Ask the loft installer to keep eaves vents clear so the roof space stays ventilated
- Ask for the cold water tanks and pipes in the loft to be insulated once the floor is covered
- Do not cover old wiring or downlighters with insulation without an electrician checking them
- If the loft insulation is grant-funded, ask for the work to be lodged with TrustMark
Loft Insulation cost: questions people ask
£300–£1,500 per job, about £950 typical. A top-up in a small loft costs least; a large loft with boarding over the insulation costs most.
Most lofts are insulated in half a day to a day. Raised boarding adds another day or so.
Possibly. ECO4 and the Great British Insulation Scheme, run through energy suppliers, fund insulation for eligible households, so check before booking.
About 270mm of mineral wool is the usual recommendation. Many older lofts have far less and benefit from a top-up.
Clearing the loft, raised boarding, a new loft ladder and any electrical work are usually extra.
They are Locufy guide prices for the UK, read from published UK loft insulation cost guides — a national range, not a quote. Loft size and boarding set your price.