Getting an installer around to have a look at your home may seem like the obvious thing to do, but informing yourself is always a good idea. Read this list of pros and cons to see it cavity wall insulation is for you or if it might be better to spend your money on other energy saving features.


  • You can expect to save around £150 each year on your heating bills and if it is installed along with loft insulation you could be looking at savings of more than £265 every year. This benefit is ongoing.
  • If you are on benefits or aged over 70 you may be able to get a cavity wall insulation grant for free. Energy suppliers also offer schemes to help with payment.
  • You will be helping to reduce the amount of carbon which is released into the atmosphere each year by burning less fossil fuel and consuming less energy.
  • You will add to the value and saleability of your home. You may also be able to get a better energy rating for your home.
  • You are likely to have fewer problems with condensation on exterior walls.
  • Your heating will work more efficiently, especially those radiators which are installed on external walls.
  • Wall cavity insulation will actually help to keep your home cooler in the summer months as well as warmer in the winter months.


  • You will need to pay anything up to £300 to have wall cavity insulation installed if you are not on benefits or aged over 70.
  • The larger your home the more expensive it will be.
  • Homes which were built before 1920 may not be suitable for this type of insulation, yet they are probably the homes which need it the most.
  • If your external walls are prone to dampness, they will not be suitable. You will need to fix this problem before you start, which is added expense.
  • On its own, wall cavity insulation only saves around £150 each year which is a relatively small amount compared to other energy saving measures.
  • Holes will need to drilled into your masonry which can be disguised but not completely hidden.
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