You could save money on your energy bills by insulating your home.

One way to do this is with cavity wall insulation – this could save you from £70 to £225 per year. Find out how much you could save by visiting the Energy Saving Trust.

What is a cavity wall?

Cavity walls are made up of two layers of brick or concrete. They have a hollow gap (or cavity) between them.

If your home was built after 1920 or the walls are thicker than 28cm it's likely you have cavity walls.

The installation process

When you get cavity wall insulation, the engineer will drill holes (measuring between 18mm and 25mm) into your walls from the outside of your house.

Once they've pumped the insulation material in through the holes, they'll fill them in. They'll try to make sure it looks as close to how your external walls look as possible.