A typical home loses about one third of its heat through uninsulated walls.
Improving wall insulation can help you stay warmer and reduce heating costs by 25%-40%.
If the property was built before or around 1920, it most likely has solid walls. Solid wall insulation can be installed from either the inside (internal insulation) or the outside (external insulation).
If the property was built after 1920, the property is likely to have cavity walls. These have a double external wall with a small gap between which can be filled with insulation.
If the property is less than 10 years old, the walls should already be insulated.
Internal wall insulation can cost between £5,500 and £8,500. External wall insulation can cost between £9,400 and £13,000.
Cavity wall insulation can cost around £500.
Wall insulation may be free for those on certain income-related benefits.
Potential saving: Up to £290 per year.