Comprehensive guides to insulating your UK home. Cavity wall, loft, external wall, and underfloor insulation costs, savings, and DIY vs professional installation.
209 articles
Cavity wall insulation saves a typical 1960s semi-detached home £395 a year on heating bills. Check costs, payback period, and grant eligibility before installing.
Loft insulation costs £300–£700 in the UK in 2026. Learn the price breakdown for blanket vs rigid boards and how to save on installation. Compare quotes today.
Check cavity wall insulation with a borescope survey (£80-£150) or thermal imaging (£150-£300) in 2026. You can also spot damp patches or cold walls for free as DIY signs of…
Removing cavity wall insulation costs £2,500-£6,000 for a 3-bed semi-detached house, depending on the material type. Polystyrene beads are cheapest and fastest, while foam removal is most expensive and may…
Cavity wall insulation is foam, bead, or fibre injected into the 50-100mm gap between your home's two wall layers. After installation, the material is completely hidden and the outer wall…
Cavity wall insulation can cause damp in about 5% of installations, with average repair costs of £1,500 (INCA, 2026). The three main mechanisms are rain penetration, condensation, and rising damp…
Cavity wall insulation saves £170–£325 per year on heating bills for a typical UK home. It works by filling the cavity with material that traps still air, reducing heat conduction…
Removal takes one to two days for a typical 3-bed semi-detached house. Larger or complex homes can take three to five days. The exact duration depends on the insulation material…
The standard cavity wall insulation guarantee is 25 years from installation, provided by the Cavity Insulation Guarantee Agency (CIGA) for registered installers. It covers defects in materials and workmanship, not…
Cavity wall insulation typically lasts 25 years or more, with EPS beads lasting 30+ years. Material type and cavity dryness determine actual lifespan. Check for moisture ingress to maximise performance.
Cavity wall insulation removal costs £800-£1,500 for a 3-bed semi. Two approved methods exist: vacuum extraction for loose-fill materials and chemical foam removal for injected foams. Compare quotes before deciding.
Cavity wall insulation reduces heat loss by filling the air gap with low-conductivity material, stopping the convective loop that carries heat outside. This can cut wall heat loss by about…
Check your CIGA certificate or EPC first to identify cavity wall insulation. If paperwork is missing, look for 20–25mm injection holes on external walls or use a borescope to view…
EPS beads are best for most UK homes, costing £30-£45 per m² installed, while mineral wool is cheaper at £20-£35 but riskier in wet conditions. Choose EPS beads for exposed…
The minimum loft insulation thickness in UK homes is 270 mm for mineral wool, based on the Building Regulations target U-value of 0.16 W/m²K. Higher-performance materials like PIR boards need…
Cavity wall insulation became standard in the UK in 1985, when Building Regulations Part L required a U-value of 0.6 W/m²K for external walls. If your home was built before…
Cavity wall insulation has never been compulsory for existing UK homes, but new builds have required it since 2002 under Part L. Here is what the law actually says.
You need at least 270mm of attic insulation, typically three 100mm layers of mineral wool. Measure your loft floor area in square metres to calculate the exact amount. Check Energy…
270 mm of mineral wool loft insulation is best, achieving a U-value of 0.16 W/m²K. This depth meets UK Building Regulations (2026) and saves £180-£295 per year on a 3-bed…
UK building regulations require at least 270mm of mineral wool loft insulation for new builds, extensions, and conversions to achieve a U-value of 0.16 W/m²K. Existing homes have no legal…
Most UK homes need 270mm of mineral wool loft insulation, or the thermal equivalent of a U-value of 0.16 W/m²K. For a 60m² semi-detached loft, that means about 18 standard…
270 mm of mineral wool is the cost-effective limit for UK loft insulation, saving around £35 a year. Adding more offers less than 1% extra heat retention.
You need 270mm of mineral-wool loft insulation to meet the 2026 building-regulation minimum. This depth can save a typical gas-heated three-bed semi up to £300 per year on heating bills,…
270 mm is the recommended loft insulation depth for UK homes. This saves up to £400 per year on heating for a typical semi-detached house with gas heating. Check your…
Cavity wall insulation typically costs 500 to 1,500 pounds for a standard three-bedroom semi-detached house. The exact cost depends on the size of your home and accessibility. It can save around 150 to 250 pounds per year on heating bills, giving a payback of 3 to 6 years.
The recommended thickness for loft insulation in the UK is 270mm of mineral wool or equivalent. Many older homes have only 100mm or less. Topping up existing insulation to the recommended depth is one of the cheapest and most effective energy improvements you can make.
External wall insulation costs 8,000 to 15,000 pounds but can save 200 to 400 pounds per year on heating bills. It also improves comfort, reduces condensation risk, and can transform the appearance of your home. Grants through ECO4 or the Great British Insulation Scheme may cover part of the cost.
You can DIY loft insulation and basic draught proofing, which are straightforward projects. However, cavity wall insulation, external wall insulation, and underfloor insulation should be installed by certified professionals to ensure effectiveness, building regulations compliance, and warranty coverage.
Check your EPC certificate which will state whether cavity wall insulation is present. For a physical check, a professional can drill a small hole in the wall and use a borescope to inspect the cavity. Homes built after 1990 are likely to have insulation fitted during construction.
UK home insulation costs range from £300-£500 for loft insulation saving £200-£300 per year, to £500-£1,500 for cavity wall insulation saving £200-£400 per year. The Great British Insulation Scheme closed…
The recommended loft insulation thickness in the UK is 270mm of mineral wool for a standard cold loft, as specified under Part L of the Building Regulations and endorsed by…
External wall insulation in the UK costs between £80 and £200 per square metre installed in 2026, with whole-house projects typically ranging from £8,000 to £25,000 depending on property size,…
Insulating a solid wall house internally is a highly effective way to cut heat loss in older UK properties, where uninsulated solid walls can account for up to 35% of…
Underfloor insulation for a suspended timber floor involves fitting insulating material, most commonly mineral wool batts or rigid foam boards, between the timber joists in the void beneath your ground…
Internal wall insulation for period properties involves fixing insulating boards or natural materials to the inside face of solid brick or stone walls, preserving the exterior appearance while reducing heat…
