Most types of wall can be insulated in one way or another. A typical house with cavity walls could save up to £155 per year in heating bills just from wall insulation
Cavity Wall Insulation
Cavity wall insulation fills gaps often found between external walls in homes built after 1920, keeping the warmth in to save energy. It can also help reduce condensation inside the house if this is a problem stemming from your external walls. The insulation is blown into the cavity from the outside of a house. Every part of the wall must be filled with insulation, so it’s important that the installer can reach all your external walls.
The installer would carry out a technical survey prior to any wall insulation installation. This is to ensure that each elevation is suitable for any proposed insulation. It will also ensure that you are made aware of what will happen during the install, how long it will take and when it will take place.
If you are looking for someone to insulate your walls, you will find installers listed by the National Insulation Association.
The Smith Emsley Partneship can also provide recommendations for local reputable installers.