Private Homeowners / Landlords

If your home was built before 1919, its external walls are probably solid rather than cavity walls.

Cavity walls are made of two layers with a small gap or ‘cavity’ between the whereas solid walls have no gap, so they let more heat through. Adding insulation to the outside of your home acts as a ‘thermal jacketing’ effect, keeping heat in during winter whilst and cooler during summer months. It also helps reduce temperature fluctuations throughout the year and maintains a more comfortable internal living environment in your home.

So put simply, the better insulated a building is, the less money will be spent on heating it.