A well-insulated home is cheaper to heat, more comfortable and better for the
planet. Small changes make a difference, and bigger measures are often
part-funded by a grant — but quality matters, so it’s important to use the
right people.
The main measures
The biggest wins are usually insulating what you already have:
loft insulation,
cavity wall insulation where your walls are suitable, and
solid wall insulation for older homes without cavities.
Draught-proofing, a hot-water cylinder jacket and floor insulation all help
too. Your EPC is a good place to start, as it
lists the measures likely to have the most impact on your home.
Grants that can help
Several schemes can cover part or all of the cost for eligible households. The
Great British Insulation Scheme offers insulation help but is
closing to new installations on 31 March 2026; the
Warm Homes: Local Grant supports lower-income owners in
England; and ECO4 has now closed to new applications. Our
insulation grants page and
Grants and funding hub set out what you can still get.
Use a quality installer
Insulation done badly can cause damp, so quality is not optional. Look for a
TrustMark-registered installer working to the recognised
standards (PAS 2035/2030), get a written quote and guarantee, and be wary of
unsolicited doorstep or phone offers that pressure you to sign quickly. If
something sounds too good to be true, take your time and check.
What to do next
Check your EPC, see which grants you qualify for, and use a
TrustMark-registered installer. If insulation work has gone wrong, see our
home-improvement and insulation claims
page.
Sources
GOV.UK (Great British Insulation Scheme; Warm Homes: Local Grant); Ofgem;
TrustMark. Reviewed: 3 September 2026.