Home Insulation Savings Calculator

Loft insulation typically saves 10-20% on heating bills. For a medium home with £2,400 annual bills, this is £240-£480 per year. Payback is usually 1-3 years.

GBIS offers free or heavily subsidised insulation for homes in council tax bands A-D (EPC rating D or below) or households receiving certain benefits. Apply through your energy supplier.

Loft insulation has the best ROI (payback 1-3 years, cost £300-£600). Cavity wall insulation (payback 3-5 years, cost £500-£1,000) is also excellent. Solid wall insulation (cost £8,000-£20,000) has a much longer payback.

Yes. Better EPC rating from insulation can add 2-5% to property value. Energy-efficient homes are increasingly valued by buyers and mortgage lenders.

Accessible loft insulation (rolls or blown) is a DIY project. Lay 270mm depth of mineral wool. Professional installation costs £300-£600 for average homes and ensures correct depth and coverage.

Cavity wall insulation fills the gap between the inner and outer leaves of cavity walls with mineral wool or bead insulation. Suitable for homes built after 1920 with standard 50mm+ cavity.

Homes built after 1920 generally have cavity walls. Check by measuring the width of exterior walls — cavity walls are typically 27cm+ thick versus solid walls at 22cm.

Available grants: Great British Insulation Scheme (GBIS), ECO4 scheme for low-income households, and Warm Homes Local Grant. Scotland has Warmer Homes Scotland. Wales has the Warm Homes Programme.

An Energy Performance Certificate (EPC) rates your home A-G for energy efficiency. Insulation typically improves your EPC by one or two grades, which can reduce mortgage rates and attract better rental yields.

External solid wall insulation changes the appearance of your home and may require planning permission in conservation areas or for listed buildings. Check with your local council.

ECO4 provides free energy efficiency measures including insulation, heat pumps, and boiler upgrades for low-income households or those in poor-quality homes. Check eligibility at gov.uk.

Mineral wool loft insulation lasts 40+ years. Cavity wall insulation typically lasts 25+ years. Solid wall insulation can last the life of the building. All types require occasional inspection.