Keep more of the warmth you pay for.
From your loft to your walls, understand which improvements suit your property. A proper assessment is the first step to effective insulation.
Find insulation helpExplore your options. Get a quote. Decide in your own time.
Why Insulate Your Home?
Save Money
Cut heat loss and lower your heating bills
Warmer Home
Maintain comfortable temperatures
Reduce Carbon
Lower your environmental impact
Funding May Help
Some households get help through ECO4 or their council
Types of Insulation
Typical costs, last reviewed September 2026. Source: Energy Saving Trust, July 2026 prices (unsubsidised, gas-heated home). What you save depends on your home.
Cavity Wall Insulation
Fill the gap between the two layers of your outside walls with insulating material. Common in homes built after the 1920s.
- Saves around £110-£380 a year
- Typical cost £950-£3,900
- About two hours for an average home
- Ask for a 25-year guarantee
Loft Insulation
Reduce heat escaping through your roof with mineral wool rolls or blown insulation. An uninsulated home can lose around 25% of its heat this way.
- Saves around £140-£360 a year (from none)
- Typical cost £650-£1,200
- 270mm depth recommended
- Lifespan of around 40 years
External Wall Insulation
Add insulation to the outside of solid walls, finished with render or cladding. For homes without cavity walls.
- Saves around £140-£500 a year
- Around £15,000 for a 3-bed semi
- Doesn't reduce room sizes
- Check planning rules with your council
Internal Wall Insulation
Insulation boards or an insulated stud wall fitted to the inside of solid walls. An option when external work isn't possible.
- Saves around £140-£500 a year
- Around £12,000 for a 3-bed semi
- Leaves the outside unchanged
- Slightly reduces room sizes
Floor Insulation
Insulate ground floors to reduce heat loss and draughts. Most common in older homes with suspended timber floors.
- Saves around £40-£100 a year
- Typical cost £1,400-£2,500 (suspended timber)
- Reduces draughts
- Airbricks must be kept clear
Room-in-Roof Insulation
Insulation for loft conversions and rooms with sloping ceilings, fitted between and over the rafters.
- Needed when a loft is used as a room
- Helps stop rooms overheating in summer
- Keeps heat in during winter
- A job for trained installers
Specialist Insulation and Removal
Superfoil Insulation
Thin multi-layer reflective (multifoil) insulation for places where thicker insulation won't fit. Check its tested performance, as thinner does not mean equal.
- Thin profile for limited spaces
- Most products need air gaps to work as designed
- Used in roofs, walls and floors
- Ask for independently tested performance
Spray Foam Insulation Removal
Removal of spray foam insulation where it is causing problems with roof timbers, ventilation, or a sale or remortgage.
- Some lenders have been wary of spray foam in roof spaces
- Check what your lender or surveyor needs first
- Roof timbers may need repair after removal
- Get written quotes after a survey
ECO4 and Other Insulation Funding
The Energy Company Obligation (ECO4) is a government obligation on energy suppliers in Great Britain. It is not a grant: suppliers and installers decide what support to offer, so work may be fully or partly funded and you may be asked to contribute. ECO4 ends on 31 December 2026 and there is no successor scheme.
Who May Qualify for ECO4?
- Owner-occupiers with an EPC rating of D-G (private tenants E-G, with the owner's permission)
- Households getting certain benefits, such as Universal Credit, Pension Credit or Housing Benefit
- Through your council (ECO4 Flex): household income under £31,000, or other local routes
- Apply through an energy supplier or your local council
Other Options
- England: Warm Homes: Local Grant through councils (EPC D-G, income usually £36,000 or less)
- Scotland: Home Energy Scotland Grant and Loan. Wales: Warm Homes Nest scheme
- Northern Ireland: Affordable Warmth Scheme and NISEP
- The Great British Insulation Scheme closed on 31 March 2026
- Installed insulation has 0% VAT until 31 March 2027, then 5%
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 on GOV.UK or Warm Homes: Local Grant.
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