Calculate your external wall insulation cost
External wall insulation cost per m² in Brighton
External wall insulation by property type in Brighton
The UK figures are current property examples; the city column applies the same moderated 18% regional weighting as the live calculator.
UK £5,000–£7,000 · avg £6,000£5,150–£7,200 · avg £6,150
UK £6,000–£10,000 · avg £8,000£6,150–£10,250 · avg £8,200
UK £14,000–£20,000 · avg £17,000£14,400–£20,550 · avg £17,450
UK £15,000–£21,000 · avg £18,000£15,400–£21,550 · avg £18,500
UK £20,000–£30,000 · avg £25,000£20,550–£30,800 · avg £25,650
Current UK system benchmarks
What can change a real Brighton quote?
- External wall area
- EPS, mineral wool or board system
- Render or cladding finish
- Scaffolding
- Gutter and pipework changes
- Existing wall condition
Local planning considerations
Coastal exposure, conservation areas, parking and restricted access can affect individual quotations beyond the broad South East planning model.
- Exterior specifications may need more attention where a property is exposed to coastal weather and salt-laden air.
- Tight street access or controlled parking can change waste, scaffold and delivery logistics even when the underlying project is unchanged.
- Check listed-building or conservation constraints before assuming a standard window, roof, rendering or extension specification.
How the regional model works
The live external-wall-insulation calculator uses only 18% of the broad South East regional difference because insulation boards, fixings and render systems contain a substantial nationally priced material component. The resulting Brighton EWI factor is 1.027× and is applied to the current £150–£200 per m² installed benchmark.
Sources
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 in Brighton in 2026?
The current UK installed benchmark is £150–£200 per m², averaging about £175 per m². Using the same moderated regional factor as the live calculator gives a Brighton planning rate of about £154–£205 per m².
How much is external wall insulation for a semi-detached house in Brighton?
The current UK semi-detached example is £14,000–£20,000, averaging £17,000. Applying the moderated Brighton model gives about £14,400–£20,550, with a modelled midpoint near £17,450.
Why is the Brighton EWI adjustment smaller than the broad regional factor?
External wall insulation contains a large material and system component, so the live calculator applies only 18% of the broad regional difference rather than treating the entire installed price as locally variable labour.
What can make external wall insulation more expensive?
Wall repairs, scaffolding, architectural detailing, moving rainwater pipes and services, premium finishes, difficult access and larger exposed wall areas can all increase the final quote.