If you live in South Wales, Swansea, Cardiff, or Bristol and suspect your cavity wall insulation has failed, your first thought will often be about the guarantee. Many homeowners have heard of CIGA but aren’t sure exactly what the guarantee covers or how to start a claim when you notice damp patches, cold walls, or other signs of insulation problems. Understanding your guarantee is key to getting the issue resolved quickly and without extra cost.
This guide will help you identify what paperwork to look for, explain the role of CIGA as the guarantee administrator, and walk you through the typical steps to make a claim. Whether it’s contacting your installer, arranging an inspection, or gathering evidence like photos and dates, you’ll find practical advice to prepare and protect your home. If you need a second opinion or specialist advice on repairs or insulation extraction, we also explain when and how to get expert help.
Understanding CIGA and cavity wall guarantees
CIGA stands for the Cavity Insulation Guarantee Agency. It is not an installer or a government body, but an organisation that administers long term guarantees for certain types of cavity wall insulation in existing homes.
In most cases, when insulation is installed by a registered contractor, the homeowner receives a CIGA guarantee certificate. This usually provides cover for a set number of years against problems arising from the workmanship or materials, subject to the terms and exclusions in the document.
It is important to remember that guarantees are not all the same. Some homes have a CIGA guarantee, others have a different scheme or only the installer’s own warranty. Always check your own paperwork to see what applies to your property.
Paperwork you might have for your cavity wall insulation
Before starting any claim, gather the documents relating to your insulation. These will help show when the work was done, who did it, and what guarantee, if any, is in place.
CIGA guarantee certificate or other guarantee document
Installer invoice, contract, or completion paperwork
Any previous survey reports relating to damp, cracking, or insulation
Letters or emails from the installer about the work or past issues
If you cannot find your guarantee, check old files from when you bought the house, or ask your solicitor if they handled the purchase. Guarantees are sometimes kept with mortgage or conveyancing paperwork, especially for properties in areas like Swansea, Cardiff, Bristol and across South Wales where insulation schemes were common.
You can also contact CIGA directly to see if they hold a record for your address. They may be able to confirm whether a guarantee was issued and provide a duplicate, usually for a fee.
How the CIGA claims process usually works
Every case is different, but most claim journeys follow a similar pattern. The key is to follow the procedure set out by your guarantor so you do not risk delaying or invalidating your claim.
In many situations the steps look like this:
Check your documents to confirm the guarantee provider, the date of installation, and any conditions or exclusions.
Contact the right party. If you have a CIGA guarantee, you usually go to CIGA rather than the installer first. If your guarantee is from the installer or another body, follow their contact details and process.
Submit a claim or enquiry form. This may involve explaining the problems you are seeing, when they started, and which rooms are affected.
Arrange a site inspection. An inspector or surveyor acting for the guarantor will normally visit your home to assess the issues.
Await a written outcome. After the visit, you should receive a report or letter describing the findings and the next steps.
Keep copies of all emails and letters, and make a simple timeline of events. This makes it easier to explain your position clearly, especially if problems have been ongoing for several years.
Preparing your home and evidence for a CIGA inspection
Good preparation helps the inspector see the full picture in a single visit. This can make the process smoother and reduce the need for repeat appointments.
Before the inspection, it often helps to:
Record what you can see inside. Note which rooms have damp patches, black mould, peeling wallpaper, or cold spots. Make a simple list, such as “front bedroom, left corner above window” so you can point issues out quickly on the day.
Take clear photographs. Photograph damp patches, condensation patterns, skirting boards, and any areas where plaster is crumbling. Try to note the date the problem first appeared, and any times it has got worse, for example after heavy rain or strong winds.
Check external walls. Walk around the outside of the property and look for cracks in render, missing pointing, blocked air bricks, leaking gutters or downpipes, and signs of high ground levels or bridging at DPC level. Photos of these areas can be very helpful, especially on exposed elevations in coastal parts of South Wales and around Bristol.
Gather previous repair history. If you have had roofing work, repointing, damp proofing, or previous insulation investigations, have any reports and invoices ready. This background helps the inspector separate insulation issues from wider building defects.
On the day, try to provide easy access to all affected rooms, loft hatches and key external walls. Move furniture a little away from problem areas so surfaces can be checked properly.
Possible outcomes after a CIGA claim inspection
After the inspection, the guarantor will normally issue a conclusion based on their findings and the guarantee terms. This is typically set out in a letter or report.
Common outcomes include:
Remedial works to the insulation. If the inspector concludes that the cavity wall insulation or its installation is causing problems covered by the guarantee, they may arrange corrective work. This might include localised repairs, top-ups, or measures to address specific defects.
Recommendations for other repairs. Sometimes the main issues are linked to building defects such as cracked render, defective pointing, guttering leaks, or structural movement. In these cases, you may receive advice to repair those problems rather than works to the insulation itself. These repairs are usually the homeowner’s responsibility.
Advice to remove or extract insulation. In some properties, particularly those exposed to severe wind-driven rain or where walls are in poor condition, the recommended solution may be partial or full cavity wall insulation extraction. This is more common in certain construction types and locations, and is usually carried out by specialist contractors.
If you are told that extraction is recommended or being considered, you may wish to read more about the process and its impacts on your home. An example resource would be a dedicated cavity wall insulation extraction information page that explains methods, access requirements and what to expect.
Important notes and getting a second opinion
Every guarantee has its own wording, conditions and limits. The information above is a general guide only and is not legal advice. You should always read your own guarantee documents carefully and follow the process set by your guarantor, whether that is CIGA or another provider.
If you feel unsure about the outcome of a CIGA inspection, or you would like an independent view before agreeing to major works such as extraction, an impartial survey can be very useful. A second opinion can help you understand whether problems are mainly insulation-related or linked to broader building issues.
Homeowners in South Wales, Swansea, Cardiff and Bristol who need independent cavity wall insulation surveys or advice on possible extraction can contact Cavi Clear Ltd for help. To book a survey or discuss your concerns, call 01639790426 and speak to the team about your property and the issues you are seeing.
