UK cavity wall insulation calculator
Cavity Wall Insulation Cost Calculator
Estimate cavity wall insulation using current 2026 UK property-type benchmarks with transparent condition and regional adjustments.
Enter a postcode to set the cost region automatically.
Estimated cavity wall insulation budget
£2,329 – £3,122Typical planning estimate £2,676. The model is anchored to current UK property examples of about £950 for a flat, £2,700 for a semi-detached house and £4,600 for a detached house. Condition and regional adjustments are modelling assumptions.
Benchmark source: Checkatrade Cavity Wall Insulation Cost 2026 guide, July 2026. See sources →