Around a third of all heat lost from homes is through uninsulated walls. Heat will always flow from a warm areas to colder areas. In winter, the colder it is outside, the faster heat from your home will escape into the surrounding air.
Most houses built from the 1990s onwards have wall insulation to keep the heat in, but if your house is older than that it may not have any wall insulation. If this is the case then you may be heating the outside air, instead of just heating your home. Most types of walls can be insulated in one way or another. If you have a typical house with cavity walls, you could save £160* per year in heating bills just from insulating the walls or if you have solid walls then you could save £260* a year in energy bills.
The first thing you need to find out is what sort of walls you have.
Houses in the UK mostly have either solid walls or cavity walls:
- A cavity wall is made up of two walls with a gap in between, known as the cavity; the outer leaf is usually made of brick, and the inner layer of brick or concrete block.
- A solid wall has no cavity; each wall is a single solid wall, usually made of brick or stone.
*Provided by Energy Saving Trust: Based on a gas-heated semi-detached house.