Free External Wall Insulation Quote
External Wall Insulation Cost Estimate
Get a professional external wall insulation and rendering price guide tailored to your home.
Request a custom pricing breakdown from our local Hertfordshire experts for EPS, Rock Wool or Kingspan, complete with practical energy-saving advice. Absolutely no obligation.
Cost Calculator
Request Your Personalised EWI Quote
Get a detailed project estimate from our expert team. Simply fill out our quick form below, select your preferred insulation type, and we will prepare your custom pricing overview.
Simple, transparent and zero obligation.
Why request an EWI quote with us?
- Save time – receive a clear pricing outline tailored directly to your property style without endless back-and-forth calls.
- Transparent pricing – easily compare our structural rates for EPS, Rock Wool or Kingspan at a glance.
- Energy-saving insight – get an expert assessment of potential EPC gains before you commit to the project.
- Zero obligation – receive honest, fixed per-m² budgeting figures with absolutely no pressure.
Request Your Price Breakdown Today
Share your property details with us using the form above.
Our specialists will manually evaluate your requirements, crunch the numbers, and deliver a comprehensive project estimate straight to your inbox.
How we calculate your external wall insulation cost per m²
- Wall area – total length × height (we ensure exact physical dimensions are analysed for precision pricing, avoiding any hidden surprises).
- Material rate – choose:
• EPS £120/m²
• Rock Wool £140/m²
• Kingspan £135/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 2026
Bungalow ≈ 80 m²
- EPS ≈ £9,600
- Rock Wool ≈ £11,200
- Kingspan ≈ £10,800
End‑Terrace ≈ 100 m²
- EPS ≈ £12,000
- Rock Wool ≈ £14,000
- Kingspan ≈ £13,500
Semi‑Detached ≈ 120 m²
- EPS ≈ £14,400
- Rock Wool ≈ £16,800
- Kingspan ≈ £16,200
Detached 2‑storey ≈ 170 m²
- EPS ≈ £20,400
- Rock Wool ≈ £23,800
- Kingspan ≈ £22,950
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 comprehensive quote?
Fill out our short enquiry form to get started. You will receive:
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A bespoke, accurate project pricing overview from our expert estimating team.
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A direct option to book a free, no-obligation physical site survey within 48 hours.
Prefer a chat? Call 07594 373 464 or visit our contact page.
External Wall Insulation FAQs
How accurate is our project estimate?
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 £120/m² for EPS, £140/m² for Rock Wool and £135/m² for Kingspan. Submit your details below to receive a personalised pricing guide for your property.
Want independent advice first?
Read the Energy Saving Trust’s solid‑wall guide.
Area We Cover
Office Location
Over 21 Years of Experience
Why Choose EWI Specialists?
With 21+ years’ experience, our fully insured installers deliver external wall insulation and rendering that lasts – protecting brickwork, cutting heat loss and refreshing your façade. Tidy, on-time workmanship, clear pricing, and 4.9★ Google-rated service.