Spray Foam Insulation Cost UK 2026

Spray foam loft insulation costs £30–£60/m² installed in 2026. While quick to apply, closed-cell foam can cause mortgage problems — most lenders prefer open-cell or traditional insulation.

Quick answer

Typical UK price range: £2,200–£6,000. Typical time: 1–2 days.

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Insulation calculator

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Insulation type Loft insulation (270mm) Cavity wall insulation External wall insulation Internal wall insulation Spray foam loft (open-cell)

Area to insulate (m²)

Region London South East South West Midlands North of England Scotland Wales Northern Ireland

Specification level Basic / standard Mid-range Premium / high-end

Extras

Pre-install survey £80–£200 Vapour control layer £150–£400 Ventilation upgrade £200–£600

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Estimate only. Prices reflect 2026 UK market data — get quotes from local tradespeople for accurate pricing.

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Budget Under £5,000 £5,000 – £15,000 £15,000 – £30,000 £30,000 – £60,000 £60,000+ Not sure

Timeline As soon as possible 1 – 3 months 3 – 6 months 6+ months Just researching

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Key points

• £30–£60/m² installed
• Open-cell preferred over closed-cell
• Most UK lenders restrict mortgages on closed-cell foam in lofts
• Quick install: 1–2 days

Cost breakdown

Item	Low	High
Open-cell spray foam (3-bed)	£2,200	£4,500
Closed-cell spray foam (3-bed)	£3,000	£6,000

Cost by UK region

Region	Typical cost
London	£5,535
South East	£5,125
South West	£4,510
Midlands	£4,100
North England	£3,690
Scotland	£3,895
Wales	£3,690

How to save money

• AVOID closed-cell foam in lofts — affects mortgage saleability
• Always check with your lender first
• Traditional mineral wool is much cheaper and lender-friendly

How to find a trusted tradesperson

Get at least 3 quotes from vetted UK trade networks:

• Checkatrade
• MyBuilder
• Bark

FAQs

Should I get spray foam in my loft?

Probably not — most UK lenders restrict mortgages on closed-cell spray foam. Open-cell is safer but still triggers some lender questions. Traditional mineral wool is the safer choice.

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Disclaimer: Prices are guide ranges based on 2026 UK market data. Get quotes from local tradespeople for accurate pricing.