Roof and loft
Insulating the loft is usually the cheapest big upgrade, and the first job in a home that has little or none.
The short answer
- Usually, yes It costs £600 to £750 and lasts about 40 years, and a grant often pays for it
- A median 3.2% less gas after loft insulation, about £28 a year for a 3 bed semi on gas
- About 21 years to pay back a £600 top-up at full price, though a loft with little in it usually saves more
Calculators
Guides
Is Loft Insulation Worth It?Loft insulation costs £600 to £750. Homes used 3.2% less gas after it, about £28 a year for a 3 bed semi. When it pays back and how to get it free.
DIY Loft Insulation: Step-by-Step GuideDIY loft insulation step by step: lay 270mm without blocking eaves vents, cables or downlights. A pro charges £600 to £750, says the Energy Saving Trust.
How Long Does Loft Insulation Last?Loft insulation lasts around 40 years if it stays dry and uncompressed, says the Energy Saving Trust. Signs it needs attention and when to top up to 270mm.
How to Get Free Loft Insulation UK 2026Free loft insulation in 2026: ECO4 until 31 December 2026 if you claim a qualifying benefit, or a council grant in England. Who qualifies and how to apply.
Draught-Proofing Your HomeDraught-proofing a whole house costs about £250 professionally and saves about £55 a year, says the Energy Saving Trust. What to seal, what never to block.