Insulation fitted under ECO4 or GBIS? Check your repair options

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External Wall Insulation

External Wall Insulation Removal Cost: What to Expect

How removing external wall insulation (EWI) is usually priced, the few cost figures that are actually published, and when you should not be paying for the work at all.

Fitted under ECO4 or GBIS? Check the free route before paying anyone
TrustMark offers a free Find & Fix audit for external wall insulation installed under ECO4 or the Great British Insulation Scheme. If it finds faults, putting them right should cost you nothing.

Before You Pay for Removal

ECO4 or GBIS external wall insulation: TrustMark runs the government's Find & Fix programme and offers every household with EWI installed under these schemes a free audit. If faults are found, TrustMark arranges for the installer or retrofit coordinator to fix them, and you should not be asked to pay. If the installer has gone, the 25-year guarantee covers repairs (up to £20,000, or up to £25,000 for Installation Assurance Authority guarantees since 17 June 2026), and the National Energy Foundation covers some homes where the guarantee was cancelled, fraudulent or missing.

Contact TrustMark on 0333 555 1234 (option 1) or onsitebookings@trustmark.org.uk. Paying for removal before the audit could leave you paying for work that should have been free.

Privately paid EWI: go back to the installer first, then check your guarantee. The Energy Saving Trust says any TrustMark solid wall insulation company will offer a 25-year guarantee, backed by an insurance company or provided through SWIGA.

Published Cost Figures

There is no reliable published price for removing EWI from a whole house, and the real cost depends heavily on the property and the damage found. These are the only figures we could source.

£30 to £40 per m²
Removal only
Excludes scaffolding and making good. Checkatrade, table updated July 2026. One trade directory's figure, so treat it as a rough guide.
£5,000 to £18,000
Repairing ECO4/GBIS EWI
Typical repair cost if done before major damage, according to the National Audit Office (October 2025). Paid by the installer or guarantee, not you.
Around £15,000
Installing new EWI
Typical three-bed semi, installation only, according to the Energy Saving Trust (updated June 2026). Relevant if you plan to replace the system.

Last reviewed September 2026.

How a Removal Quote Is Usually Built Up

Removal is usually quoted per m² plus scaffolding and repairs. Make sure every quote you compare covers the same stages, and get independent quotes.

1. Survey and assessmentDamp survey typically £150 to £300; RICS Level 3 survey £630 to £1,500 (HomeOwners Alliance)
2. Scaffolding and accessPriced by quote; not included in per-m² removal figures
3. Removing render, boards, fixings and adhesiveCheckatrade: £30 to £40 per m²
4. Waste disposal and skipsPriced by quote
5. Wall repair and making goodPriced by quote, often only once the wall is exposed
6. Finishing (render, masonry paint or brick cleaning)Priced by quote

Last reviewed September 2026.

Scaffolding depends on the height of the house, access and how long it stays up, so delays add hire time. Removal is labour-intensive and needs care to avoid damaging the wall underneath. Wall repairs such as repointing, render patching or replacing wall ties often cannot be priced until the insulation is off, so agree in writing how any extra work will be priced before the job starts.

Factors That Affect EWI Removal Cost

1. Wall area

Costs scale with the wall surface involved. Measure or estimate your external wall area (height times perimeter, minus windows and doors) so quotes can be compared like for like.

2. Type of EWI system installed

Insulation board type and thickness

Polystyrene (EPS), mineral wool and phenolic boards behave differently when cut away and create different amounts of waste and dust.

Render type and thickness

Thicker or heavier render layers take more labour to remove.

Mechanical fixings

Every fixing into the wall leaves a hole to fill, so heavily fixed systems need more making good.

3. Damage behind the insulation

Where moisture has damaged brickwork, mortar or wall ties, the job goes well beyond simple removal. This is the hardest part to price in advance.

4. Access and property characteristics

Cost-increasing factors

  • Three storeys or more
  • Limited access for vehicles and equipment
  • Listed building or conservation area
  • Complex architectural details

Cost-reducing factors

  • One or two storeys
  • Good vehicle access for equipment
  • Simple rectangular design
  • Little damage to the wall underneath

Who Pays, and Other Ways to Cover the Cost

1. ECO4 or GBIS installations

The original installer is liable, then the 25-year guarantee, then in some cases the National Energy Foundation. The government's position is that households should not be asked to pay. Start with the free Find & Fix audit. If you had internal wall insulation instead, raise concerns with Ofgem's ECO contact centre on 0808 169 4447.

2. Privately paid installations

Complain to the installer in writing first. If the business is TrustMark registered, use TrustMark's complaints process: the business, then its Scheme Provider, then the Dispute Resolution Ombudsman (which cannot help if the business has ceased trading, or with claims for compensation). You can also contact your guarantee provider.

Under the Consumer Rights Act 2015, a trader must carry out a service with reasonable care and skill (for contracts from 1 October 2015). The small claims limit is £10,000 in England and Wales and £5,000 in Northern Ireland; in Scotland, the simple procedure covers claims of £5,000 or less. For advice on your position, contact the Citizens Advice consumer helpline on 0808 223 1133.

3. Buildings insurance

Check your policy wording and ask your insurer. Policies differ on whether damage linked to poor workmanship or gradual damp is covered.

There is no government compensation scheme
Scheme guarantees pay for repairs, not for damaged belongings, ill health or loss of earnings. Be wary of anyone who contacts you offering to run a claim for a fee, and get independent advice before signing anything.

4. If you are paying yourself

  • Ask for staged payments linked to completed work rather than a large upfront deposit
  • If you are considering a loan or remortgage, get independent financial advice first
  • Ask your council whether any local help is available

What's Included vs Extra Costs

Usually included in a quoted price

  • Labour for removal and basic wall repair
  • Scaffolding hire for an agreed period (check this)
  • Disposal of non-hazardous waste
  • Materials for a standard wall finish

Often charged as extras

  • Surveys and assessments before work starts
  • Asbestos testing and removal, if older wall coatings need checking
  • Structural repairs beyond cosmetic work
  • Damp treatments
  • Premium finishes such as lime render or specialist paints
  • Scaffolding kept up beyond the agreed period
  • Making good inside (plaster and decoration)

How to Get Accurate Quotes

Information to provide

  1. 1.Property details: type, number of storeys, approximate wall area or dimensions
  2. 2.EWI type: if known, the insulation, thickness and render type
  3. 3.Installation date: when it was installed, by whom and under which scheme
  4. 4.Current problems: damp, mould, cracking, with photos if possible
  5. 5.Access details: parking and any access restrictions
  6. 6.Desired finish: render and paint, brick restoration or another preference

Questions to ask contractors

Experience and credentials

  • •How many EWI removal jobs have you done, and can I speak to recent customers?
  • •Are you TrustMark registered? (Check on TrustMark's register.)
  • •What insurance do you hold, and can I see the certificates?
  • •Are you independent of the original installer?

Scope and process

  • •Exactly what is included in your price, and is scaffolding extra?
  • •How long will the job take from start to finish?
  • •How will you price any extra damage found during removal?
  • •What guarantee do you give on the work, and who backs it?

If no free route covers you

If your EWI was not fitted under ECO4 or GBIS, or no guarantee applies, we can introduce you to a removal specialist through Better Home Hub. Sending an enquiry is free. The specialist may pay Better Home Hub a fee, and any quote or work is agreed and paid for between you and them, so check their registration, insurance and guarantee yourself.

Ask for a specialistRead about surveys first

Frequently Asked Questions

Can I remove EWI myself to save money?

Not recommended. It involves working at height, heavy waste and the risk of damaging the wall underneath. Removing or disturbing the insulation yourself could also affect a guarantee or the free audit, so check the guarantee terms before anyone touches it.

How long does EWI removal take?

It depends on the size of the house, access, the weather and what is found behind the boards. Ask each contractor for a written programme, including how long the scaffolding will be up.

Do I need planning permission to remove EWI?

Check with your local planning authority before changing the outside appearance of your home, especially if it is a listed building, in a conservation area, or a flat.

Will removing EWI affect my EPC rating?

Removing insulation is likely to lower your EPC rating. If you want to recover some of that, ask a surveyor or retrofit adviser about alternatives such as internal wall insulation, loft insulation or better glazing.

Sources

Last reviewed September 2026.