Insulation Cost Calculator — UK Prices 2025
Insulation Cost Calculator
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How much does insulation cost in the UK?
Use our calculator above to get an accurate estimate based on your specific requirements. Prices are based on real quotes from UK tradespeople and updated quarterly.
What affects the cost of insulation?
- Location: London and the South East are 15–40% more expensive than the national average.
- Size and complexity: Larger or more complex jobs cost proportionally more.
- Material quality: Budget, mid-range and premium specifications can vary by 2–3x.
- Time of year: Demand peaks in spring and summer — book in winter for better availability and pricing.
- Access: Difficult access (scaffolding, confined spaces) adds to labour costs.
How to save money on insulation
- Get at least 3 quotes from different tradespeople.
- Book during quieter periods (January–March for most trades).
- Be flexible on start dates — tradespeople often discount for convenient scheduling.
- Supply your own materials where possible (but confirm with your tradesperson first).
- Combine jobs — having multiple trades on site at once can reduce overall costs.
How to find a good tradesperson
Always check reviews on Checkatrade, Rated People or MyBuilder. Ask for references from recent similar jobs. Ensure they are appropriately qualified and insured. Never pay the full amount upfront — a deposit of 10–25% is standard.
Frequently asked questions
How much does loft insulation cost in the UK?
Loft insulation costs £300–£600 for a typical semi-detached house. If you qualify for ECO4 or the Great British Insulation Scheme, it may be free or heavily subsidised.
How much does cavity wall insulation cost?
Cavity wall insulation costs £400–£1,200 for a typical semi-detached house. It is often available free under ECO4 for eligible households.
How much does solid wall insulation cost?
Internal solid wall insulation costs £5,000–£12,000 for a typical house. External solid wall insulation costs £8,000–£20,000. Both are eligible for ECO4 grants for qualifying households.
What government grants are available for insulation?
ECO4 provides free insulation for households on benefits or with low EPC ratings. The Great British Insulation Scheme (GBIS) provides subsidised insulation for homes in EPC bands D–G. Check eligibility at gov.uk.
How much can I save with loft insulation?
Loft insulation saves £150–£300/year on heating bills for a typical semi-detached house. Cavity wall insulation saves £200–£400/year. Solid wall insulation saves £300–£600/year.