What is cavity wall insulation?

Views of cavity wall insulation from the side and from the top.

Cavity wall insulation is a filling blown into the gap between your exterior wall. It helps prevent heat escaping through the cavity walls of your home. Without cavity wall insulation you could be wasting as much as £160[2] every single year.

It keeps your home warmer in winter and cooler in summer.

You don't need to be a British Gas customer to get free insulation.

If your home was built between 1932 and 1982 then you are likely to have cavity walls.

Any home built after 1st January 1983 should already have cavity wall insulation installed.

Benefits of cavity wall insulation

  • Save up to £160[2] every year on your energy bills.
  • It’s quick and usually takes less than a day.
  • Convenience and hassle free installation and we tidy up after.
  • Reduce heat loss – up to 35% of heat is lost through uninsulated walls.
  • Save around 600kg of CO2 every year, reducing the impact on the environment.

[1] British Gas installs in mainland Great Britain only. Free installations are through the Energy Companies Obligation and are subject to assessment, technical survey and eligibility criteria. The funding available is to cover insulation and if needed extra specialist equipment i.e. scaffolding and vents. Some properties require more specialist equipment which can't always be covered so if you need more you have the option to pay the extra. Tenants must seek landlord's permission.

[2] Savings figure source energysavingtrust.org.uk/Insulation/Roof-and-loft-insulation and energysavingtrust.org.uk/Insulation/Cavity-wall-insulation March 2015. Actual savings depend on individual circumstances.