Comprehensive guides to insulating your UK home. Cavity wall, loft, external wall, and underfloor insulation costs, savings, and DIY vs professional installation.
209 articles
Yes, you can draught proof old sash windows without replacing them, reducing heat loss by up to 20% according to the Energy Saving Trust. For a typical three-bedroom house with…
The best way to draught proof a UK front door is to combine a brush strip for the bottom gap with self-adhesive foam strips for the sides and top. This…
Hot water cylinder insulation is highly effective, reducing heat loss by up to 80% and saving a typical UK household £50 to £80 a year on energy bills, according to…
Insulating a suspended timber floor in a UK home typically costs between £1,200 and £2,500 for a 50m² area, including materials and professional installation. The final price depends on whether…
Internal wall insulation can cause moisture problems in UK homes if installed without a proper vapour control layer or ventilation strategy, but correctly fitted systems are safe. For pre-1919 solid…
The main EWI render finishes available in the UK are silicone, acrylic, mineral, and monocouche. Silicone render is the most popular choice, costing roughly £40 to £60 per square metre…
To fix a thermal bridge in a UK home, you must apply continuous insulation that fully wraps the building element, such as at wall-floor junctions or around windows, to stop…
Phenolic insulation offers around 20% better thermal performance than PIR for UK walls, with a lambda value as low as 0.018 W/mK versus PIR's 0.022 W/mK, meaning you can achieve…
PIR insulation boards offer slightly better thermal performance with a lambda value of 0.022 W/mK compared to PUR's 0.023 W/mK, and they have higher fire resistance ratings under BS EN…
Loft hatch insulation is highly effective, reducing heat loss through the opening by up to 90% with a properly fitted insulated cover. A standard uninsulated hatch can lose over 100…
You can DIY install loft insulation in the UK without a notification, but you must meet the minimum U-value of 0.16 W/m²K, typically requiring 270mm to 300mm of material. Cavity…
Yes, insulation can cause damp and mould in UK homes if incorrectly installed or combined with poor ventilation. For a typical solid-wall home, fixing condensation issues after insulation can cost…
Under UK Building Regulations 2026, loft insulation must be at least 270mm thick, while cavity wall insulation typically ranges from 100mm to 150mm, as set out in Approved Document L.…
For a UK Victorian terrace with solid brick walls, the best insulation is internal wall insulation using vapour-permeable wood fibre or mineral wool boards, not spray foam. Internal insulation with…
The best insulation for a 1930s UK semi-detached house is cavity wall insulation costing £600–£1,200, combined with 300 mm of mineral wool loft insulation for £300–£500. This combination can cut…
Mineral wool insulation is generally slightly more thermally efficient than sheep wool, with a thermal conductivity of 0.032–0.040 W/mK compared to sheep wool's 0.038–0.042 W/mK, and costs around £10–£15 per…
Yes, spray foam insulation can be a significant problem when selling a UK house, with over 70% of lenders now requiring a specialist survey before approving a mortgage (BSA, 2026).…
In 2026, UK U-value targets for new dwellings are 0.18 W/m²K for walls, 0.11 W/m²K for roofs, and 0.13 W/m²K for floors under Approved Document L of the Building Regulations.…
The Great British Insulation Scheme closed on 31 March 2026. It funded insulation measures only and never covered windows or glazing. The Great British Insulation Scheme closed on 31 March…
Loft insulation costs between £10 and £30 per square metre installed in the UK in 2026, with the final price depending on material, thickness, and whether you DIY or hire…
Bargeboard, fascia, soffit, and verge are the four key roofline components protecting your home from weather and pests. Fascias run horizontally under the gutter, bargeboards diagonally along gables, soffits ventilate…
An orangery costs £38k-£50k for 20 m² in 2026, versus £26k-£38k for a conservatory and £30k-£45k for a garden room. The choice depends on whether you need year-round habitable space…
A conservatory solid roof replacement costs £8,000–£18,000 in the UK. Building Regulations approval is mandatory because it changes the thermal envelope, and labour typically accounts for 40–50% of the total…
Loft insulation costs £300-£500 for DIY mineral wool or £500-£1,000 for professional blown-fibre in a 3-bed semi. Sealing all air gaps before laying material is the most critical step 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…
