Comprehensive guides to insulating your UK home. Cavity wall, loft, external wall, and underfloor insulation costs, savings, and DIY vs professional installation.
209 articles
Bonded bead cavity insulation saves £255–£380 per year on heating bills for a typical semi-detached home. It reduces heat loss by up to 70% and pays back in 4 to…
Garage roof insulation costs £20-£35 per m² for PIR boards, or £8-£15 per m² for mineral wool. An uninsulated attached garage roof can account for up to 25% of house…
Yes, loft conversions under 2026 regs must achieve a roof U-value of 0.18 W/m²K or better, plus a vapour control layer. This is stricter than top-up insulation for cold lofts…
A wall insulation contractor costs £800-£2,400 for cavity walls or £5,000-£15,000 for solid walls in 2026. The right certified installer can save you hundreds on heating bills annually, while an…
Mineral wool and closed-cell spray foam are the most pest-proof insulation choices for UK homes. These inorganic materials resist nesting, chewing, and moisture that attracts rodents, unlike organic options like…
A cold bridge adds £75-£150 yearly for a gas-heated home or £340-£680 for an electric home, per Energy Saving Trust and Ofgem 2026 data. Fix wall-to-floor junctions, window reveals, and…
Cellulose insulation costs £18-£25 per m² installed for a loft at 270mm depth and saves £180-£260 annually on heating for a semi-detached house. It contains 80-85% recycled newspaper and has…
Flat roof insulation costs £900–£4,500 in 2026 for a 30m² roof, with warm roofs at the higher end and cold roofs at the lower end. The largest cost factor is…
Sheep wool insulation costs £8–£14 per m², roughly double the £4–£7 per m² for mineral wool. It offers unique moisture management benefits but is slightly less thermally efficient than synthetic…
Internal wall insulation costs £55–£100 per m², and external costs £100–£200 per m². The key trade-off is lower cost and less disruption with internal, versus no floor space loss and…
An air tightness test costs £200-£350 and measures air leakage through your home's fabric. A typical new UK home should achieve 5 m³/(h·m²) at 50 Pa or lower. The test…
Park home insulation costs £1,500-£5,000 typically. The two main options are upgrading cavity/void insulation or adding external/internal insulation. Always get written site owner consent first.
Acoustic insulation UK costs £2,500-£5,000 for a full party-wall retrofit and reduces neighbour noise by 40-60 dB. A single room costs £400-£1,200. Compare quotes from MCS-accredited installers to find the…
Conservatory insulation costs £2,500 to £8,000 for a full upgrade, roughly half the price of a solid-roof replacement. The final cost depends on conservatory size and the materials you choose.
PIR boards outperform mineral wool in thermal efficiency (0.022 vs 0.032–0.044 W/mK), needing less thickness for the same U‑value. However, mineral wool wins on fire resistance, sound damping, and cost.…
Spray foam insulation can block mortgages, over 70% of lender queries involve it (BSA, 2026). It is not banned but must meet PAS 2035 standards to avoid rejection. Check compliance…
The cheapest way to insulate a conservatory roof is DIY rigid foam boards at £5-£15 per m², achieving U-values of 0.18-0.25 W/m²K. Check planning permission first to avoid costly mistakes,…
Cavity wall insulation problems cost thousands to fix. The main issues are damp from thermal bridging, cold spots, and structural cracks, all caused by wrong material or installation. A borescope…
The maximum solid wall insulation grant in 2026 is £7,500 under ECO4, but most households will not receive this full amount. Eligibility depends on income, property type, and energy performance,…
Internal wall insulation typically needs 60–120 mm thickness to meet Building Regulations U-values. Solid brick walls require 80–100 mm, cavity walls 60–80 mm, and solid stone walls 100–120 mm. Thicker…
Insulating a suspended timber floor costs £500–£1,200 for a typical UK semi-detached home. Annual heating bill savings range from £40–£80 (Energy Saving Trust, 2026).
Insulating a garage roof costs £300–£800 for materials on a single-car garage. This is one of the cheapest ways to cut heat loss from an attached garage, according to the…
Silicone render costs £45-£60 per square metre installed for external wall insulation. It is the most breathable and self-cleaning finish, reducing long-term maintenance. Compare render types now.
Insulating a brick wall from inside costs £40-£80/m² and cuts heat loss by up to 45%. The Great British Insulation Scheme closed on 31 March 2026. It funded insulation measures…
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…
