2026 Insulation Prices UK
Real installed prices for loft, cavity wall, internal wall & external wall insulation — plus eligibility checks for ECO4 & GBIS grants that can cover 100% of the cost.
Typical UK insulation prices by type
Range reflects property size, material and accessibility.
Prices include VAT & standard installation. Your exact quote will reflect your property & postcode.
What affects insulation prices?
The six biggest factors that push your insulation quote up or down.
Property size
Bigger loft or wall area = more material and labour. Priced per m².
Insulation type
EWI is ~10× the price of loft insulation but delivers the biggest energy saving.
Grant eligibility
ECO4 & GBIS can fund 100% of qualifying jobs for low-income or EPC D–G homes.
Accessibility
Cramped lofts, scaffolding needs and render complexity add to labour time.
Existing insulation
Topping up existing insulation is cheaper than starting from scratch.
Region
London & the South East run 15–25% above national average on labour.
How much does insulation cost in 2026?
The average UK homeowner pays £395 for loft insulation, £1,890 for cavity wall, and £14,500 for external wall insulation — installed and including VAT. Prices depend on property size, insulation type and whether existing material needs removing first.
If you qualify for ECO4 or the Great British Insulation Scheme, you may pay nothing at all. Around 1 in 4 households qualify.
Which insulation gives the best return?
Loft insulation pays back fastest (under 2 years) if your home has less than 120mm. Cavity wall pays back in 3–5 years. EWI takes longer (10–15 years) but can knock £500+ off yearly energy bills and add ~14% to property value.
Grants & funding explained
- ECO4 — fully-funded loft, cavity & IWI/EWI for low-income or EPC D–G homes (runs to March 2026).
- GBIS — partial funding for council tax bands A–D (A–E in Scotland).
- Local authority flex — broader eligibility if your council has signed up.
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