Loft Insulation Cost Calculator
See typical costs and bill savings for insulating your loft to 270mm, from scratch or as a top-up, based on Energy Saving Trust figures (July 2026 prices).
Estimate Your Loft Insulation Cost
Typical costs, last reviewed September 2026. Source: Energy Saving Trust, July 2026 prices, gas-heated home. Your quote and savings will depend on your home.
You may be able to get funding
With an EPC of D, your home is in the band ECO4 uses (until 31 December 2026). ECO4 may fully or partly fund the work if you get qualifying benefits or your council accepts you, for example with gross income under £31,000; you may be asked to contribute. In England, the Warm Homes: Local Grant covers privately owned homes rated D to G, usually for household incomes of £36,000 or less.
Get free quotes from local insulation installers
Tell us about the job and we’ll find up to 3 local insulation installers who cover your area and ask them to contact you with a quote. Your answers above go with your enquiry. Free, no obligation.
Send a Free EnquiryTypical Loft Insulation Costs
No insulation to 270mm
Semi-detached house
Saves around £190 a year
£750
Detached house
Saves around £360 a year
£1,100
Mid-terrace house
Saves around £140 a year
£650
Detached bungalow
Saves around £350 a year
£1,200
Top-up from 120mm to 270mm
Semi-detached house
Saves around £17 a year
£600
Detached house
Saves around £35 a year
£800
Mid-terrace house
Saves around £13 a year
£500
Detached bungalow
Saves around £35 a year
£800
Typical costs, last reviewed September 2026. Source: Energy Saving Trust, July 2026 prices; average unsubsidised professional installation, savings for a gas-heated home.
What Affects the Price
- House type and loft size: bigger lofts need more material and labour
- Starting depth: a top-up costs less, but also saves far less than insulating an empty loft
- Access: cluttered or awkward lofts can take longer
- Boarding: if you want to store things, ask for raised boards so the insulation is not squashed
Funding for Loft Insulation
ECO4 (ends 31 December 2026)
Not a fixed grant: work may be fully or partly funded, and you may be asked to contribute.
- ✓Qualifying benefits, or gross household income under £31,000 through a participating council (ECO4 Flex)
- ✓EPC rating D to G if you own your home; E to G if you rent privately
Warm Homes: Local Grant (England)
Run by councils until 31 March 2028. Owner-occupiers do not pay; landlords may need to contribute.
- ✓Household income usually £36,000 or less, or certain benefits, or an eligible postcode area
- ✓Privately owned home with an EPC rating of D to G
The Great British Insulation Scheme closed on 31 March 2026 and was not extended. UK Energy Partnership is run by Harber Glaves Trading Ltd. We are not a government body and cannot decide who gets funding — check eligibility with the official scheme, for example Warm Homes: Local Grant on GOV.UK or our loft insulation grants guide.
Benefits of Loft Insulation
💰 Save Around £140 to £360 a Year
Insulating an empty loft to 270mm, depending on house type (Energy Saving Trust). Estimates, not guaranteed.
🏠 Warmer Home
Less heat escapes through your roof
⚡ Usually Straightforward
Often a simple job where the loft is easy to get into
🌍 Lower Emissions
Around 460 to 1,200 kg less CO2 a year for an empty loft (Energy Saving Trust)
📈 Better EPC Rating
Loft insulation can improve your EPC rating
🔍 Check the Installer
Check an installer's registration on TrustMark before agreeing to work
Get Loft Insulation Quotes
Free to send an enquiry • We pass it to Better Home Hub • Funding is decided by the scheme, not us
Send a Free Enquiry