What affects the cost?
External wall insulation pricing depends on wall area, insulation material, render or cladding finish, scaffolding, pipework alterations and property access.
- External wall area
- EPS, mineral wool or board system
- Render or cladding finish
- Scaffolding
- Gutter and pipework changes
- Existing wall condition
Typical cost breakdown
Regional planning examples
The examples below apply our published modelling factor to the same national benchmark. They are not claimed as observed city-wide average quotes.
Sources used for this guide
External Wall Insulation Cost: 2026 UK Guide
Published / checked: July 2026
Used for: Installed external-wall insulation cost-per-m² and property-type ranges
Frequently asked questions
How much does external wall insulation cost per m²?
Current UK installed costs are around £150–£200 per m², with an average planning point near £175 per m².
What does a semi-detached house cost to externally insulate?
A current UK planning range is around £14,000–£20,000.
Related costs
Home insulation
UK loft and cavity wall insulation costs by property type, material and insulated area.
£650–£1,200 loft / £30–£65 per m² cavity foamView guide →Cost guideHouse rendering
UK house rendering prices per square metre, by render type and property size.
£30–£80 per m²View guide →Cost guideScaffolding
Typical UK scaffolding hire costs per square metre, by house type and project setup.
£20–£25 per m²View guide →