Greener homes. Cavity wall insulation

If your house was built after the 1920s, it’s likely to have cavity walls. And left uninsulated, you’ll lose heat and pay more on your energy bills. But we can help with that.

Get insulated

Does your home have cavity walls?

  • Was your home built between the 1920s and 1980s?
  • Are the walls thicker than 26cm?
  • From the outside looking on, are the bricks evenly laid like in the diagram?

Then it’s likely you’ve got cavity walls. And with a third of heat lost in uninsulated homes through the walls, having them insulated can help reduce that heat loss as well as lower your energy bills.

Help me with insulation

What happens when you get cavity wall insulation?

After being put in touch with a Trustmark registered installer, you’ll be one step closer to a warmer home. Here’s what’s involved in the process:

  • They do an assessment of your cavity wall, drilling small holes to make sure there’s no debris that could cause problems later down the line
  • Installation can take one day – the installer blows insulation beads into the cavity using compressed air
  • After installation, you’ll be given guidance on how to control moisture in your home along with other useful recommendations

You may be eligible for all your cavity wall insulation costs to be funded under the Great British Insulation Scheme. Check your eligibility here.

Help with home insulation

Loft insulation

Don’t let all your heat escape through the roof! Insulate your loft, keep the heat in and lower your energy bills.

Help me with insulation

Energy efficiency funding

There are different funding options available for insulation. Just take a look and see if you can apply.

See how it works

Frequently asked questions

How long does cavity wall insulation take?

Installing cavity wall typically takes a few hours. Your installer will drill small holes at intervals in the external walls of your home, inject insulation through the holes using specialist equipment, and then seal them with cement, so you’ll barely notice them.

Is cavity wall insulation right for my home?

Homes built between the 1920s and 1980 typically did not have Cavity Wall insulation installed when built.

During the survey, your home will be identified for its suitability for Cavity Wall insulation. This will include looking and the condition of the brickwork, and consideration of the local area (for factors such as wind-driven rain).

Are there grants available for cavity wall insulation?

It might be possible to get a partial grant for cavity wall insulation under the Great British Insulation Scheme. You can find out more here ECO scheme - British Gas.