What affects the cost?
Insulation cost depends on the area, material, property type, access and whether surveys identify damp or other remedial work before installation.
- Loft or cavity wall insulation
- Insulated area
- Property type
- Material choice
- Access and preparation
- Damp or wall-condition issues
Typical cost breakdown
Sources used for this guide
UK loft and cavity wall insulation cost guidance
Published / checked: Checked September 2026
Used for: Loft insulation property benchmarks and cavity wall per-m² costs
Frequently asked questions
How much is loft insulation?
Current UK examples for professional quilt insulation are roughly £654 for a terrace, £825 for a semi-detached house and around £1,206 for a detached house.
How much is cavity wall insulation per m²?
Current planning guides put glass wool around £25–£30 per m² and polyurethane foam around £30–£65 per m².
Related costs
Cavity wall insulation
Typical UK cavity wall insulation costs by property type and wall area.
£950–£4,600 by property typeView guide →Cost guideExternal wall insulation
UK external wall insulation costs per square metre and by property type.
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