We use cookies to allow us and selected partners to improve your experience and our advertising. By continuing to browse you consent to our use of cookies. You can understand more and change your cookies preferences here. In this article. Cavity wall insulation can cause damp. Find out if your home's likely to be affected. Posing as a consumer considering cavity-wall insulation, we invited eight insulation companies to assess a house for suitability.
We wanted to see whether the installers would correctly recognise and report that it was unsuitable for cavity wall insulation, as it had walls that were regularly exposed to wind-driven rain. We secretly filmed the sales visits and showed our findings to an expert chartered surveyor. Our video footage below shows the poor advice we received, and reveals some staggering price differences.
Ask any potential installer about these factors, too. Damp could occur in properties as a result of cavity-wall insulation if there is a combination of these factors:. Does my house have cavity walls? Can I get financial help to pay for cavity wall insulation? Can cavity-filled walls become damp? Do I need planning permission for cavity wall insulation?
Where can I find a wall insulation installer? What other types of insulation could reduce my heating bills? How much does wall insulation cost? Cavity wall insulation Cavity wall insulation costs and savings Cavity wall insulation installation Cavity wall insulation: damp problems Cavity wall insulation FAQs.
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We've also split these so you can look at the average costs for a terraced, semi-detached and detached house. Do bear in mind that costs will vary, depending on where you live in the country.
Only logged-in Which? If you're not yet a member, join Which? How much money solid wall insulation will save you each year will depend on the type and size of your home. The chart below show the average reductions to heating bills and CO2 emissions for homes of differing sizes.
Remember that the price you'll pay for external wall insulation will be affected by the condition of your walls and whether other building work or repairs will be taking place at the same time, as well as your property size.
Solid wall insulation is more expensive than cavity wall insulation, but it should lead to bigger savings on heating bills. The type you need is determined by what type of walls you've got. Head to our guide to cavity wall insulation to find out more. Solid wall insulation can be applied to either the inside or outside of solid walls.
A professional installer should be able to advise you on which option is most suitable for your home. Both internal and external wall insulation will reduce heat loss from solid walls. The type you choose will be based on factors including:. External solid wall insulation is usually installed when a building has severe heating problems or already requires some form of external repair work.
The thickness of the insulation needs to be between mm. External insulation is generally more expensive than internal, though you'll avoid the significant re-decorating that comes with internal insulation.
Once your external insulation is fitted, decorative coatings and cladding can be used to improve your home's kerb appeal. This can match a wide variety of homes, including Georgian, Victorian and Edwardian properties.
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