Loft Insulation
One of the cheapest insulation jobs. An uninsulated home can lose around 25% of its heat through the roof, and funding may help eligible households
What is Loft Insulation?
Loft insulation is a layer of material, most often mineral wool rolls, laid between and over the joists in your loft space. An uninsulated home can lose around 25% of its heat through the roof, and loft insulation reduces that heat loss.
Building regulations recommend a minimum depth of 270mm for mineral wool. Going from no insulation to 270mm saves around £140-£360 a year depending on your home, but topping up from about 120mm saves much less: around £13-£35 a year (Energy Saving Trust, July 2026 prices). Easy-to-reach, damp-free lofts can often be done yourself; flat roofs, damp lofts and lived-in lofts need a professional. If you want to store things up there, Better Lofts explains how to board a loft without squashing the insulation.
Why Choose Loft Insulation?
Lower Cost
Usually the cheapest of the main insulation jobs
Simple Job
Straightforward in an accessible, damp-free loft
Lower Bills
Around £140-£360/year if you have none now (Energy Saving Trust)
Funding May Help
ECO4 (until 31 December 2026) or your council may fully or partly fund it for eligible homes
Warmer Home
Uninsulated roofs can lose around 25% of a home's heat
Long Lasting
A lifespan of around 40 years if installed correctly
Loft Insulation Costs
Typical costs, last reviewed September 2026. Source: Energy Saving Trust, July 2026 prices (unsubsidised, gas-heated home).
Funding May Help With the Cost
ECO4 ends on 31 December 2026 and work must be finished by then. It is not a grant: work may be fully or partly funded, and you may be asked to contribute. In England, councils also run the Warm Homes: Local Grant (EPC D-G, household income usually £36,000 or less). The Great British Insulation Scheme closed on 31 March 2026.
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: ECO4 or Warm Homes: Local Grant.
Quick Grant Finder
Answer up to three quick questions to see which schemes may be worth checking
Loft Insulation Options
Blanket Insulation
Mineral wool rolls laid between joists
- Most common and affordable
- 270mm depth recommended
- Easy to install and top-up
Blown Insulation
Loose-fill material, such as mineral wool fibre or treated cellulose, blown into the loft
- Fills awkward spaces
- Fitted by a professional with specialist equipment
- Good for lofts that are hard to access
Ready to Insulate Your Loft?
Sending an enquiry is free. Better Home Hub, which runs this site, introduces installers who may be able to help. Check they are TrustMark registered before you agree to work.
Request Quotes from Installers