Cavity wall insulation

Roughly 35% of household heat escapes through the walls if uninsulated.

Proper insulation of your home’s cavity walls will keep your home warmer for longer and cut down your energy bills.

How cavity wall insulation works

Wall preparation
Small holes approximately 22mm in size are drilled in the outside walls of your home.
Injected insulation
Insulation material such as polystyrene beads is injected through the holes to fill the cavity in your walls.
Wall finish
Once the insulation has been injected, the holes in the wall are filled to become barely noticeable.
Warmer in winter
Insulation creates a barrier to stop warm air from leaving through your walls.

Energy bill savings with cavity wall insulation

Here’s how much you can save on your energy bill with cavity wall insulation per year.






Estimates based on a gas-heated home. Figures are based on fuel prices as of October 2022.

Benefits of insulation

Reduce energy bills
Save money by reducing your energy bills.
Reduce heat loss
Keep your home warmer for longer
Save energy
Reduce the amount of wasted energy in your home
Lower carbon footprint
Contribute to lowering carbon emissions.

Funding available with government-backed grants

As part of the UK government’s initiative to cut carbon emissions, grants are available to fund energy-efficient upgrades to homes with low energy ratings.

If you are living on a low-income or receive income-related benefits, you could be eligible to receive full funding for home insulation, air source heating and solar panel energy.