The short answer
Government energy grants generally fund installing cavity wall insulation, not removing it, so extraction is rarely free through a grant scheme. The main route to free or funded removal is the CIGA 25-year guarantee: if your insulation was fitted by a registered installer and has failed — for example causing damp because it was unsuitable for the property — you may be able to claim remedial work, including extraction, under that guarantee. If the original installer has ceased trading, CIGA can step in. Outside a valid guarantee claim, homeowners usually pay for removal themselves. It is worth checking whether your installation is registered with CIGA before assuming you have to fund the work, and keeping any original paperwork.
The funding picture for removal is very different from installation. Grants are built around saving energy, while removal often happens because a fill failed — which points towards a guarantee claim rather than a grant.
Funding cavity removal
- Grants for removal?Rarely — grants fund installation
- Main free routeValid CIGA guarantee claim
- Guarantee length25 years from installation
- If installer goneCIGA can cover the claim
- OtherwiseHomeowner usually pays
Why grants usually don't cover removal
UK energy-efficiency schemes are designed to add insulation to homes, because that is what cuts heating demand and carbon. Funding routes such as the Energy Company Obligation (ECO) and other government schemes pay for installing measures like cavity wall insulation, loft insulation and heating upgrades in eligible households.
Removing insulation does the opposite — it raises heat loss — so it generally falls outside the aims of those schemes. The exception is where removal is a necessary step before a correct re-installation in an eligible home, but that is handled case by case and is not a standalone removal grant. As a rule, do not assume a grant will pay to extract a failed fill.
The CIGA guarantee: the real route to funded removal
Most cavity wall insulation installed in the UK by registered installers is covered by a 25-year guarantee from the Cavity Insulation Guarantee Agency (CIGA). This is the most common way removal gets paid for without the homeowner footing the bill.
- If the insulation has caused a problem the guarantee covers — such as damp penetration linked to an unsuitable installation — you can make a claim.
- The first port of call is normally the original installer, who is obliged to investigate and remedy a valid defect.
- If that installer has ceased trading, CIGA itself can handle the claim and arrange remedial work, which may include extraction.
To use the guarantee you typically need to know the installation was registered with CIGA. You can ask CIGA to check whether a guarantee exists for your address even if you have lost the certificate.
When you will pay for removal yourself
Plenty of removals fall outside both grants and guarantees, and the homeowner pays. Common situations:
| Situation | Likely funding |
|---|---|
| Fill failed, valid CIGA guarantee | Possible free remedial claim |
| Fill installed without registration | Usually homeowner pays |
| Removal for renovation/rewall works | Homeowner pays |
| DIY or unrecorded historic install | Homeowner pays |
| Grant-eligible re-install after removal | Install may be funded, removal case by case |
Typical funding outcomes for cavity insulation removal in the UK. A valid guarantee is the main route to funded extraction.
Steps before assuming you have to pay
Before commissioning a private extraction, it is worth a short checklist to see whether the cost can be covered:
- Find the paperwork — look for a CIGA certificate, an installer invoice or scheme reference from when the insulation was fitted.
- Ask CIGA directly whether a guarantee is registered for your address; they can confirm even without your certificate.
- Document the problem — photograph damp patches, mould or staining and note when they appeared, as evidence for any claim.
- Get an independent diagnosis that the cavity fill is the cause (for example a borescope survey), rather than relying on assumption.
If no guarantee applies and the work is not part of a funded re-installation, the cost sits with the homeowner — but checking first can avoid paying for work that a guarantee would have covered.
Frequently asked questions
Will the government pay to remove my cavity wall insulation?
Generally no. UK energy schemes such as ECO are designed to install insulation, not remove it. Funded removal usually comes through a CIGA guarantee claim where the original fill has failed, not through a grant.
What if the company that installed my insulation has gone bust?
A CIGA 25-year guarantee is designed to survive the installer ceasing to trade. If the original installer has gone, CIGA can take on the claim and arrange remedial work, which may include extraction, provided the installation was registered.
I have lost my CIGA certificate — can I still claim?
Possibly. CIGA holds records of registered installations, so you can ask them to check whether a guarantee exists for your address even without the original certificate. Keeping photographic evidence of any damp problem also helps a claim.
Sources & further reading
- CIGA — Cavity Insulation Guarantee Agency (25-year guarantee and claims)
- GOV.UK — Energy Company Obligation (ECO) home upgrades
- Energy Saving Trust — grants and ways to save energy
Figures on this page are typical UK ranges drawn from published sources and depend on your specific property. They are guidance, not a quotation.