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Cavity Wall Insulation Removal
Cavity Wall Insulation Removal
Damp, cold spots or mould since your cavity walls were insulated? Find out what to check first and find a specialist to assess your walls.
Understand your options
What is cavity wall insulation removal?
Cavity wall insulation works well in many homes, but it can cause problems when a wall was unsuitable or the work was poor: for example walls exposed to driving rain, narrow or blocked cavities, or brickwork in poor repair. Damp can also have other causes, such as leaking gutters or damaged pointing, so the cause needs confirming before anything is removed.
Before you pay for removal
The Energy Saving Trust advises contacting the company that installed the insulation first. If they will not help or no longer trade, check your paperwork for a guarantee from the Cavity Insulation Guarantee Agency (CIGA) or an independent insurance-backed guarantee. If the damp is down to a lack of maintenance rather than the insulation, a guarantee is unlikely to pay.
If the insulation was fitted through a government scheme such as ECO4 or the Great British Insulation Scheme, GOV.UK explains what to do about poor quality wall insulation, including Ofgem's helpline and TrustMark's complaints process.
If none of that resolves it, an independent building surveyor can assess the walls, and a specialist cavity insulation removal company can take the insulation out. Our guide to who to contact about problems after insulation sets out that order step by step, and Cavity Wall Advice explains how to tell whether damp is coming from the cavity fill or something else.
Last reviewed September 2026. Sources: Energy Saving Trust, cavity wall insulation (updated May 2026); GOV.UK and Ofgem guidance linked above.
Tell us about the job and we'll find up to 3 local removal specialists who cover your area and ask them to contact you with a quote. The specialist assesses your walls before quoting.
From enquiry to installation
Your next steps, made clear.
Get the walls assessed
A specialist inspects the walls, usually with a borescope, to confirm the insulation is the cause and how much needs removing.
Review your quote
Ask for a written quote covering how the insulation will be extracted, how the brickwork will be made good and how removal will be checked.
Removal and checks
The insulation is extracted and the cavity checked. Ask for photos and a written record of the work for your files.
How do I know if my cavity wall insulation is causing problems?
Common signs are damp patches on inside walls, especially after rain, cold spots, mould, and peeling paint or wallpaper on external walls. These can have other causes too, so have the walls checked before deciding on removal.
Why does cavity wall insulation sometimes fail?
Common reasons include walls exposed to driving rain, cavities that are too narrow or blocked with rubble, brickwork or pointing in poor repair, and insulation fitted without a proper survey.
Will my guarantee pay for removal?
It may, if the problem is down to the installation. Contact your installer first, then CIGA or your guarantee provider. Guarantees generally do not cover damp caused by a lack of maintenance.
What if it was fitted through a government scheme?
GOV.UK guidance explains what to do if you have poor quality wall insulation fitted through ECO4 or the Great British Insulation Scheme. You can contact Ofgem, and TrustMark has a complaints process, including for installers that are no longer trading.
Will my home be colder afterwards?
Your walls will be uninsulated again, so you may use more heating. Once the cause of the damp is fixed, a specialist can advise whether the wall can be re-insulated or whether another option would suit it better.
How much does removal cost?
It depends on the size of the walls, the type of insulation and how easy it is to reach. Ask for a written quote after an assessment, and check your guarantee before you pay.
Your next step
A warmer home.
Let's start with a conversation.
Tell us what you need. We'll help you find the right specialist.