Cavity wall insulation installers are the people who will carry out the work on your home to fill the gaps between your outer and inner walls with insulating material. This is a simple, quick and cheap way to reduce heat loss and improve energy efficiency in your home.

Almost all homes built after the 1930s have cavity walls which consist of two ‘skins’ with a gap of around 50mm between them. This is a good thing as it means that the warmth of your house can’t escape from the outside through the walls.

It’s important to use a qualified installer and look for those registered with bodies such as the National Insulation Association or the Cavity Insulation Guarantee Agency (CIGA) which will ensure that their installations align with building regulations and they can offer you a 25-year guarantee against insulation problems.

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To fit the insulating material, installers will drill small holes in your external walls at regular intervals. They then blow the chosen insulation, which could be mineral wool or polystyrene beads into these holes. The holes are then filled so that you don’t even notice them and the whole process only takes about two hours.

The cost of insulating your property will be offset by the savings that you make on your heating bills. It’s advised by the Energy Saving Trust that you should recover the installation costs within five years or less. This is especially true if you live in an old, uninsulated flat or a detached house.