Comprehensive guides to insulating your UK home. Cavity wall, loft, external wall, and underfloor insulation costs, savings, and DIY vs professional installation.
209 articles
EPS insulation saves UK homeowners £300-£400 per year on heating bills for a typical semi-detached home. It is a lightweight, cost-effective foam with a lambda value of 0.030-0.038 W/mK, suitable…
Phenolic foam insulation costs £25–£40 per m² installed for 100mm boards in 2026. It outperforms PIR by 30% per mm, saving £150–£400 yearly on heating for a typical semi-detached house.
Sheep's wool insulation costs £25–£40 per m² installed in the UK, roughly 30–50% more than mineral wool. It offers comparable thermal performance (0.035–0.040 W/mK) and superior moisture management, absorbing up…
Mineral wool insulation costs £5-£8 per m² installed, saving £150-£300 yearly on heating bills. It is the cheapest insulation per square metre, with payback under 2 years for loft top-ups…
PIR insulation board costs £12–£30 per m² in 2026, with the lowest thermal conductivity of any rigid foam at 0.018–0.022 W/mK. It outperforms EPS and mineral wool at equivalent thickness,…
Insulation removal cost UK ranges from £300 to £2,000. Loft fibreglass removal costs £300–£600, while spray foam removal reaches £1,500–£2,000. Cavity wall insulation removal averages £800–£1,500. Compare quotes for accurate…
Insulation cost for a bungalow UK 2026 ranges from £500 for DIY loft insulation to over £20,000 for full solid-wall insulation. Actual costs depend on your roof type and wall…
Roof insulation cost UK ranges from £600 to £1,400 for a typical three-bed semi in 2026, with mineral wool being the cheapest option. The Great British Insulation Scheme closed on…
Solid wall insulation costs £8,000–£22,000 for a UK semi-detached home in 2026. Internal insulation is cheaper at £4,500–£14,000 but involves more indoor disruption. Savings depend on your home size and…
Loft insulation costs £300–£700 for DIY mineral wool rolls or £450–£1,000 for professional installation in a typical 3-bed semi. Annual savings of £180–£285 mean payback in 2–5 years.
Insulation cost per square metre in the UK ranges from £15 for DIY loft rolls to £130 for external wall insulation. Cavity wall insulation is the cheapest major retrofit at…
A full loft conversion insulation system costs £4,500–£6,000 for a 40 m² roof in 2026, which is £3,000 more than a standard top-up. Meeting Building Regulations Part L's 0.16 W/m²K…
Vapour-open IWI prevents damp in solid-wall homes; vapour-closed traps moisture. The key is choosing a breathable system that allows walls to dry into the room, avoiding rot and structural damage.
Insulation for a listed building costs £8,000 to £22,000 for solid walls, roughly double the cost for a standard home. Internal wall insulation using breathable materials is the most common…
Insulation for flats UK costs £300-£12,000 depending on type. Cavity wall insulation is cheapest at £1,000-£1,800, saving £150-£300 yearly. Solid wall insulation costs £4,000-£12,000 but saves £300-£500 annually. Compare options…
Insulating a typical 40m² park home costs £1,200–£3,500 installed and saves £200–£400 a year on heating bills (Energy Saving Trust, 2026). Payback ranges from 3 to 17 years, but comfort…
Hempcrete insulation costs £40–£65/m² installed, 30–50% more than mineral wool, but it is carbon-negative and breathable. The higher upfront cost can be offset by lower heating bills and no need…
Cellulose costs £15–£25/m², glass wool £10–£20/m², and sheep wool £25–£45/m² installed. All three achieve similar thermal performance at equal thickness, choose based on budget, eco-priorities, and handling safety. Compare quotes…
Loft insulation saves £300-£400 per year for an uninsulated gas-heated semi-detached home. Mineral wool costs £10-£20 per m², making it the cheapest and best option for most UK homes. Compare…
Mineral wool is the cheapest loft insulation at £4-£8/m², while PIR boards offer the best thermal performance (lambda 0.022 W/mK). Sheep's wool and cellulose fibre cost more but suit eco-friendly…
The UK standard for loft insulation is 270 mm, achieving a U-value of 0.16 W/m²K. Cavity walls need 100–150 mm, and solid walls require 50–100 mm. Check your current thickness…
New-build walls must achieve U-values of 0.18-0.26 W/m²K, roofs 0.11-0.16, and windows 1.2-1.6 under 2026 standards. These targets cut heat loss dramatically compared to uninsulated fabric. Check your retrofit options…
The 2026 insulation building regulations set U-value limits of 0.18 W/m²K for walls and 0.11 W/m²K for roofs in new builds, with a 31% lower carbon baseline than 2021. Extensions…
Floor insulation for a concrete slab costs £25 to £50 per m² installed. Annual savings are £50-£75 for gas heating or £100-£200 for electric heating. Payback ranges from 5 to…
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…
