Free External Wall Insulation Quote
External Wall Insulation Cost Calculator
Calculate your external wall insulation cost per m² in seconds with our free online tool.
Receive an instant PDF quote for EPS, Rockwool or Kingspan-plus, energy-saving tips and grant guidance. No obligation, ever.
Instant External Wall Insulation Cost Calculator
Get a live external wall insulation estimate and instant PDF quote in under two minutes.
Why check your EWI cost online?
- Save time – skip back‑and‑forth calls and know your budget today.
- Transparent pricing – compare EPS, Rock Wool or Kingspan at a glance.
- Energy‑saving insight – preview potential EPC gains before you commit.
- Zero obligation – tweak wall sizes & extras until you’re happy.
Try the calculator now
Enter your wall lengths and height, pick an insulation type and click “See My Estimate”.
We’ll crunch the numbers and email a detailed PDF you can keep.
How we calculate your external wall insulation cost per m²
- Wall area – total length × height (many UK external wall insulation calculators ignore height – we don’t).
- Material rate – choose:
• EPS £60/m²
• Rock Wool £72/m²
• Kingspan £85/m² - Site extras – soil / waste / down pipes, outdoor sockets, lights and cameras.
- Soffit insulation (optional) – £80 / linear metre if you tick the box.
Average external wall insulation prices 2025
Bungalow ≈ 80 m²
- EPS ≈ £4,800
- Rock Wool ≈ £5,760
- Kingspan ≈ £6,800
End‑Terrace ≈ 100 m²
- EPS ≈ £6,000
- Rock Wool ≈ £7,200
- Kingspan ≈ £8,500
Semi‑Detached ≈ 120 m²
- EPS ≈ £7,200
- Rock Wool ≈ £8,640
- Kingspan ≈ £10,200
Detached 2‑storey ≈ 170 m²
- EPS ≈ £10,200
- Rock Wool ≈ £12,240
- Kingspan ≈ £14,450
Prices include labour and materials but exclude scaffolding and waste removal – those are itemised after our free site survey.
Can external wall insulation pay for itself?
The Energy Saving Trust says un‑insulated solid walls can lose up to 45 % of a home’s heat.
Upgrading costs £6,000 – £15,000 on average and typically:
- cuts heating bills by £400 – £900 per year*
- often moves homes up one or two EPC bands*
*Source: Energy Saving Trust 2024
Recent EWI projects
Ready for a firm quote?
Finish the calculator and click “Submit”.
You’ll instantly receive:
- Your personalised PDF estimate
- Easy link to book a free site survey within 48 h
Prefer a chat? Call 07594 373 464 or visit our contact page.
External Wall Insulation FAQs
How accurate is the online calculator?
The figure is usually within ±10 % of the final price. A free site inspection confirms scaffolding, waste and any access factors.
What is the cost of external wall insulation per m²?
From £60/m² for EPS, £72/m² for Rock Wool and £85/m² for Kingspan in 2025. Use the calculator for a personalised figure.
Want independent advice first?
Read the Energy Saving Trust’s solid‑wall guide.
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We understand that investing in your property can be both exciting and, sometimes, a bit nerve-wracking. We believe that your peace of mind is paramount and that you should feel secure and reassured at every step of the process.
That’s why we confidently offer an industry-leading 10-year warranty on all our rendering and insulating services.
To further boost your confidence, we’ve partnered with the renowned Quality Mark Protection company. This gives you the benefit of insurance-backed protection for our services.
