Summary

Cavity wall insulation has been around since the 1970’s, and many of us have already had it installed now. If you have cavity walls, it is the single most effective energy saving measure you can have installed in your home.

It can save around 35% of the heat loss through your walls, and can save as much as 30% from your heating bills. It also saves around a tonne of carbon dioxide a year.

Homes and extensions built since around 1996 will usually have had cavity wall insulation built in as standard under building regulations but this is not always the case, on smaller housing developments in particular.

Cavity wall insulation should only be installed by registered installers, who will offer a 25-year insurance backed guarantee with the work.