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External wall insulation in London typically costs between £90 and £180 per square metre installed in 2026, with most whole-house projects landing between roughly £8,000 and £22,000 depending on size, access and finish. If you are buying materials rather than a full installed service, a complete system usually works out at around £40 to £65 per m². Penguin BM supplies external wall insulation London projects with complete, certified systems from our Wembley trade counter, with collection on site and fast delivery across the UK. This page covers current costs, the materials we stock, the benefits, and how to order.
What external wall insulation costs in London in 2026
London and the South East usually sit around 15% above the national average, mainly because of higher labour rates and trickier access. Restricted parking, pavement licences and tight terraces all add scaffolding time. Use the table below as a planning guide, then confirm with quotes. These are 2026 figures and prices move with materials and energy markets, so treat them as indicative.
| Property type | Typical installed cost (London) |
|---|---|
| Mid-floor flat | £5,000 – £8,000 |
| Mid-terrace house | £8,000 – £14,000 |
| Semi-detached house | £12,000 – £20,000 |
| Detached house | £18,000 – £30,000+ |
Installed cost covers boards, adhesive, mesh, render, scaffolding and labour. Scaffolding alone is often 15 to 30% of the total. For a full national breakdown by material and thickness, see our external wall insulation cost guide. To price your own project by wall area, our EWI calculator gives a materials take-off in minutes.
Materials cost vs installed cost
If you or your contractor are fitting the system, you only pay for materials. A complete graphite EPS system (board, adhesive, basecoat, mesh, primer and silicone render) is typically £40 to £65 per m², which is where trade buyers make the biggest saving against an installed quote.
EWI materials we supply for London projects
An EWI system only performs when the layers are compatible, so we supply complete external wall insulation systems rather than loose parts:
- Insulation boards: graphite (grey) EPS for the best cost-to-performance ratio, mineral wool where A1 fire performance or breathability matters, and PIR where a slim profile is needed.
- Adhesive and basecoat: cement-based adhesives for solid brick, plus reinforcing basecoat.
- Reinforcement mesh: alkali-resistant fibreglass mesh, typically 160 to 165 g/m².
- Mechanical fixings, corner beads and facade profiles.
- Finish: silicone render for flexibility, water resistance and self-cleaning, in a wide colour range.
EPS or mineral wool?
Graphite EPS (thermal conductivity around 0.031 W/mK) reaches a low U-value with a thinner board and suits most houses. Mineral wool is heavier and dearer, but it is classed A1 for reaction to fire and is breathable, which is why it is specified on taller buildings and where fire performance is the priority.
Build a complete, compatible EWI system at trade prices, ready to collect in Wembley or delivered UK-wide.
Shop nowBenefits of external wall insulation
Solid-wall homes, common across London’s Victorian and Edwardian streets, can lose up to around 35 to 45% of their heat through uninsulated walls. A well-fitted system:
- cuts heat loss and lowers heating bills, often by £300 to £700 a year depending on property and fuel;
- improves your EPC rating, which matters for resale and for landlords facing tightening minimum standards;
- warms internal wall surfaces, reducing condensation and mould;
- protects brickwork from rain and frost, extending the life of the fabric;
- refreshes tired facades without losing internal floor space, unlike internal insulation.
Standards, fire and compliance
Retrofit EWI in the UK sits under the PAS 2035 framework, with installation carried out to PAS 2030 by TrustMark-registered installers where grant funding is involved. Under Building Regulations Part L, upgraded walls typically target a U-value of around 0.30 W/m²K or better, which usually means roughly 90 to 100 mm of graphite EPS, though the exact thickness depends on the wall and your target performance. Reaction-to-fire classification (Euroclass) also matters: buildings above 18 m must use non-combustible materials, and mid-rise blocks face tighter rules, which is where A1-rated mineral wool is specified. These thresholds change, so confirm current requirements for your building before you specify.
Collection from our Wembley store and UK delivery
Our trade counter is at 416 Ealing Road, Wembley HA0 1JQ, close to the North Circular and well placed for external wall insulation Wembley pickups and the wider London area. Opening hours are Monday to Friday 7:00 to 16:00 and Saturday 7:00 to 13:00.
Wembley trade counter
Collect complete systems and individual components in person from our store in Wembley.
Click and collect
Order online and collect, or call ahead and we will have your pallet ready.
Fast UK delivery
We deliver complete EWI systems across the UK, usually within a few working days.
Whether you are an EWI installer working across London or a homeowner buying for your own project, we can put together a compatible system at a trade price.
Frequently asked questions
How much does EWI cost in London?
As a rough 2026 guide, EWI London cost runs about £90 to £180 per m² installed, or roughly £8,000 to £22,000 for a typical house, with London a little above the national average. Materials on their own are usually £40 to £65 per m². For an exact figure, price your wall area with our EWI calculator or ask us for a trade quote.
Can I collect materials from your Wembley store?
Yes. You can collect complete systems and individual components from our store at 416 Ealing Road, Wembley HA0 1JQ. Order online for click-and-collect, or call to check stock before you travel.
Do you work with EWI installers in London?
We are a materials supplier, not an installation company, and many EWI installers in London buy their systems from us at trade prices. If you are a homeowner, we would always point you to a PAS 2030 and PAS 2035 certified installer for the fitting, and we are happy to supply the materials they specify.
Are there grants for external wall insulation in 2026?
Possibly, depending on your circumstances. The Great British Insulation Scheme closed on 31 March 2026, while ECO4 has been extended to 31 December 2026 for eligible low-income households. In England, the Warm Homes: Local Grant now runs through local councils, including London boroughs, for lower-income households in poorly rated homes. Schemes, budgets and deadlines change through the year, so check the latest position on gov.uk or with your council.
Do I need planning permission for EWI in London?
Usually not, as most EWI falls under permitted development. The main exceptions are listed buildings and conservation areas, which are common in parts of London, so always check with your local planning authority first.
Get your EWI system from Penguin BM
Request a trade quote for your London project, or collect from our Wembley store at 416 Ealing Road, HA0 1JQ. Not local? We deliver complete external wall insulation systems across the UK within a few working days. Get in touch for a trade price today.
