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External wall insulation · Render · Repairs

External wall insulation and render, detailed to last

Insulate solid and hard-to-heat walls from the outside, cover tired pebble dash or failing render, and get a fixed written price after a free survey — anywhere in England, Wales, Scotland or Northern Ireland.

  • Free survey and written quote, no obligation
  • Guide prices online — EWI from £105 per m² plus scaffold, 0% VAT
  • Planning and building control checked for your address
  • 0% VAT on qualifying home insulation until 31 March 2027
Get a guide price 0800 088 6248
A 1930s semi-detached house with finished off-white render on one half and grey insulation boards with orange fixings behind scaffolding on the other Boards and fixings on one half, finished silicone render on the other

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  • Free surveyand written quote
  • Fixed pricefor the agreed specification, in writing
  • UK-wideEngland, Wales, Scotland and NI
  • Guarantee termsset out in writing before you sign
  • 0% VATon qualifying home insulation until 31 March 2027

How we work

What makes an EWI job last

Most failures come from details, not the insulation. We plan those details at survey and write them into the quote.

Insulation first

We look at whether the wall should be insulated before talking about colour — especially when you're re-rendering anyway.

Details that keep walls dry

Starter track above the damp-proof course, extended cills, sealed penetrations and roofline details planned at survey.

The right board for the wall

EPS, mineral wool, wood fibre or phenolic, chosen for the wall type, building height and planning setting.

Prices you can see

Guide prices online and a quote tool, then a fixed written price after the survey.

Shop by service

Insulation, render and repairs

Every service has a guide price. Pick the closest match — the survey confirms what your walls need.

External wall insulation

Insulation fixed to the outside of the wall and finished in render, brick slip or dash.

Side gable of a semi-detached house part-way through external wall insulation, with mineral wool slabs, mesh base coat and finished white render
From £105 per m² + scaffold · 0% VAT

External wall insulation

Insulation boards fixed outside and finished in render — no lost room space.

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Close-up of white EPS insulation boards being fixed to a brick wall with orange-capped mechanical fixings
From £105 per m² + scaffold · 0% VAT

EPS external wall insulation

Light, cost-effective polystyrene boards for houses and bungalows.

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Mineral wool insulation slabs fixed to the wall of a low-rise block of flats behind scaffolding with debris netting
From £125 per m² + scaffold · 0% VAT

Mineral wool external wall insulation

Non-combustible, breathable slabs — the choice for flats and taller walls.

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Brown wood fibre insulation boards fixed to an old stone cottage wall, with part of the wall already in lime render
From £150 per m² + scaffold · 0% VAT

Wood fibre insulation for older homes

Breathable boards with lime render for stone and period walls.

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A pair of post-war concrete semi-detached houses newly rendered in white and grey beside neighbours still showing concrete panels
From £120 per m² + scaffold · 0% VAT

Non-traditional and concrete house insulation

EWI for no-fines, PRC, steel-framed and other system-built homes.

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A single-storey park home finished in smooth stone-coloured render with a small planted garden
From £7,995 0% VAT

Park home insulation

Thin EWI and render systems for single and twin-unit park homes.

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A five-storey block of flats half re-clad in white and grey insulated render, with scaffolding on the brick half
From £110 per m² + scaffold · 0% VAT

EWI for flats and blocks

Whole-block insulation for landlords, RMCs and managing agents.

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A two-storey commercial building finished in white insulated render with a charcoal plinth and dark windows
From £110 per m² + scaffold · + VAT

Commercial and public building EWI

Insulated render for offices, schools and community buildings.

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Solid and internal wall insulation

Options for solid-walled homes, including insulating from the inside.

Victorian end-of-terrace house with dark insulation boards fixed to the lower half of the gable wall behind scaffolding
From £75 per m² + scaffold · 0% VAT

Solid wall insulation

External or internal insulation for homes with no cavity to fill.

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A bedroom wall being lined with insulated plasterboard around a window, with dust sheets and a stepladder
From £75 per m² 0% VAT

Internal wall insulation

Insulate from the inside, room by room, when the outside can't change.

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A surveyor in a hi-vis vest measuring a pebble-dashed semi-detached house with a laser measure and tablet
Free survey

EWI and render survey

Free measured survey and fixed written quote for installation work.

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Render finishes

Thin-coat, through-coloured, lime and brick-slip finishes, with or without insulation.

A modern detached house in crisp white insulated render with a charcoal grey render entrance bay
From £105 per m² + scaffold · 0% VAT

Insulated render systems

Board, mesh and render in one manufacturer-tested system.

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A gloved hand finishing off-white textured silicone render with a steel trowel
From £66 per m² + scaffold · inc VAT

Silicone render

Thin-coat, through-coloured render that sheds water and dirt.

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A worker spraying cream monocouche render onto the blockwork wall of a house extension
From £54 per m² + scaffold · inc VAT

Monocouche render

One-coat, through-coloured render for blockwork and extensions.

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A stone cottage finished in warm off-white lime render with sage green windows and a cottage garden
From £78 per m² + scaffold · inc VAT

Lime render

Breathable, hand-applied render for stone and period walls.

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Red brick slips being bonded onto a base coat over mineral wool insulation, with grey mortar joints
From £185 per m² + scaffold · 0% VAT

Brick slip finish over insulation

Insulate the wall and keep a brick appearance.

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A single-storey rear extension in pale grey acrylic render with large black bifold doors and a patio
From £60 per m² + scaffold · inc VAT

Acrylic render

Flexible, through-coloured thin-coat render in a wide colour range.

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Re-rendering, repairs and upkeep

Covering pebble dash, re-rendering, crack repairs, EWI repairs and cleaning.

A 1950s semi-detached house with new white render on one half and old pebble dash still showing on the other
From £72 per m² + scaffold · inc VAT

Covering pebble dash

Insulate or render over old pebble dash — tested first.

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A worker on scaffolding hacking off old cracked render to expose the brick wall underneath
From £90 per m² + scaffold · inc VAT

Re-rendering

Strip failed render, repair the wall and render again — or insulate.

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A gloved hand applying repair base coat to a cracked section of render beside a window
From £475 inc VAT

Render repairs

Cracks, hollow patches and beads repaired after finding the cause.

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A damaged corner of external wall insulation showing broken render, mesh and grey insulation board
From £540 inc VAT

EWI repairs and maintenance

Damage, cracks and water ingress on insulated render put right.

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A worker soft-washing green algae from a white rendered wall, with one section already cleaned
From £10 per m² inc VAT

Render cleaning and treatment

Soft-wash algae and dirt removal that won't damage thin render.

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How external wall insulation works

Six layers, one tested system

External wall insulation wraps the outside of the wall in insulation, so the masonry stays on the warm side. The boards are bonded and fixed, then covered with a reinforced base coat, primer and a decorative finish. Each layer comes from one manufacturer's tested system.

On a typical 225mm solid brick wall, around 90–110mm of board takes the U-value from roughly 2.1 to about 0.30 W/m²K — the benchmark Building Regulations in England and Wales use when a wall is renovated.

How an external wall insulation system is built upA stepped cutaway showing the existing wall, adhesive, insulation board with mechanical fixings, base coat with mesh, primer and the render finish.1Existing wall2Adhesive3Insulation board + fixings4Base coat + mesh5Primer6Silicone render finish

The details that stop EWI going wrong →

Who we help

Homes, blocks and buildings

Homeowners

For homeowners with solid-walled, pebble-dashed or tired rendered houses who want a warmer home and a new finish witho…

Private landlords

Landlords use external wall insulation to improve EPC ratings on solid-walled lets without stripping rooms, and render…

Managing agents and RMCs

For blocks, the outside walls are a shared responsibility. We provide the specification and pricing needed for leaseho…

Councils and housing associations

Social landlords own much of the UK's non-traditional and solid-walled housing. We price programmes of EWI on houses a…

Park home owners

Park home walls are thin, so insulation makes a noticeable difference to comfort. We check your site's licence spacing…

Commercial property owners

Commercial buildings often need a new façade and better thermal performance at the same time. Insulated render does bo…

Schools and public buildings

Schools, clinics and community buildings need work planned around the people using them. We phase insulated render pro…

Builders and developers

On new builds, extensions and conversions, we price render and insulation packages from drawings, programme them aroun…

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What happens next

From enquiry to handover

  1. Tell us about the property

    Use the quote tool or form, or call free on 0800 088 6248.

  2. Free survey

    We measure the walls, check condition and confirm planning and building control.

  3. Fixed written quote

    The system, details, access, exclusions and VAT, in writing. Anything hidden is priced and agreed before extra work.

  4. Installation and handover

    Work planned around the weather, then inspected and documented.

Guides

Plain answers before you spend

How much does external wall insulation cost in 2026?

External wall insulation typically costs £105–£170 per m² of wall in 2026, plus scaffolding, depending mainly on the insulation board and the finish. …

Is external wall insulation worth it?

External wall insulation is usually worth it on solid-walled and concrete houses that are hard to heat, especially when the outside needs re-rendering…

External vs internal wall insulation

External wall insulation usually performs better, keeps room sizes and renews the outside, but changes the look and needs scaffolding. Internal insula…

EPS or mineral wool: which EWI board?

EPS is lighter, cheaper and slightly thinner for the same U-value, and is the usual choice on low-rise houses. Mineral wool is non-combustible, vapour…

Do you need planning permission for external wall insulation?

For a house in England, external wall insulation is often permitted development if the finish looks similar to the existing walls. You'll usually need…

Building Regulations for wall insulation and re-rendering

In England and Wales, insulating, re-rendering or replastering more than half of a wall's area — or more than a quarter of the whole building's envelo…

All guides →

FAQ

Common questions

How much does external wall insulation cost in 2026?

Our guide price is £105–£170 per m² of wall depending on the insulation and finish, plus scaffolding. A typical three-bed semi with EPS and silicone render comes to about £10,200–£17,700 including scaffold. Installing insulation in a home is zero-rated for VAT until 31 March 2027, so that's the total. The survey fixes the price in writing.

Is there 0% VAT on external wall insulation?

Installing insulation for walls in residential accommodation is zero-rated for VAT in Great Britain until 31 March 2027 (and in Northern Ireland from 1 May 2023 to the same date), then 5% from 1 April 2027. Render-only work, repairs and commercial work are normally standard-rated.

Do I need planning permission?

Often not for a house in England or Wales if the finish looks similar to the existing walls, but you usually will in a conservation area, for flats and for commercial buildings. Scotland and Northern Ireland have their own rules. We check your address before quoting.

Can you insulate over pebble dash?

Usually, yes. We tap-test the dash for hollow areas, remove anything loose, and use extra mechanical fixings into the wall.

How long does it take?

A typical semi-detached house takes about 2–4 weeks for full external wall insulation, depending on weather and detailing. Render-only work is usually quicker.

Can I get a grant?

Possibly, depending on where you live and your circumstances: ECO4 until 31 December 2026, Warm Homes: Local Grant via some councils in England, Home Energy Scotland, Warm Homes Nest in Wales, or Affordable Warmth in Northern Ireland. Grant schemes use installers registered with them, so apply through the scheme. Our quotes are for privately funded work.

Is the price really fixed?

Yes, for the agreed specification. If something couldn't be seen at survey — such as damage behind old render — we explain it and agree any change in writing before doing extra work.

Do you cover my area?

We work across England, Wales, Scotland and Northern Ireland. Remote and island locations are covered by arrangement — send your postcode and we'll confirm.

More questions →

Areas covered

Across all four nations

Rules on planning, building control and grants differ by nation, so every area page is written for where you live.

England

Wales

Scotland

Northern Ireland

Free survey, fixed written price

Tell us about the walls and we will arrange a survey. No obligation, no work until the price is agreed in writing.

Get a guide priceCall 0800 088 6248
Call freeGet a quote