Cavity Wall Insulation

Cavity wall insulation can also help to reduce condensation inside the house if it is a problem on external walls.
What could you save?

Measure Annual saving per year (£) Installed cost £ Installed payback CO 2 saving per year
Cavity wall insulation Around £115 Around £250 Around 2 years Around 610kg

These are estimated figures based on insulating a gas-heated, semi-detached home with three bedrooms. The installed cost includes the subsidy available from the major energy suppliers under the Carbon Emissions Reduction Target (CERT); the typical unsubsidised installed cost is around £500

Cavity wall insulation is so cost effective that it will pay for itself over and over again. The better insulated your home, the less energy you need to keep it warm - and the more money you'll save.

By insulating your cavity walls you could cut your heating costs and, by saving energy, your household will produce less CO2. So, insulating your cavity walls is a great way to help fight climate change.

Could cavity wall insulation work for your home?

Generally speaking, your home will be suitable for cavity wall insulation if:
• its external walls are unfilled cavity walls
• the masonry/brick work of your property is in good condition
• your cavity is at least 50mm wide

If your home was built in the last 10 years it is likely that the cavity is already insulated. Some walls exposed to driving rain can also be unsuitable for cavity wall insulation. In all cases if you're thinking about cavity wall insulation, always check with a registered installer who will assess whether your home ticks all the right boxes.

Did you know?

An un-insulated home loses around a third of its heat through its external walls. If every UK household that is suitable for cavity wall insulation installed it, we could save around £690 million and nearly 4 million tonnes of CO2 every year.

How do you get cavity wall insulation?

Filling cavity walls is not a job you can do yourself. Installation must always be carried out by a registered installer. Find out how to get cavity wall insulation installed.

What is a registered installer?

We consider a registered installer for cavity wall insulation being one that is a member of any one of the following organisations:
• The National Insulation Association (NIA)
• The Cavity Insulation Guarantee Agency (CIGA)
• The British Board of Agrement (BBA)

Two key things to look out for when considering an installer:
• They sign up to a code of professional practice like those provided by the NIA
• The installation is guaranteed for 25 years by CIGA

For these installers, the job is simple, quick - and makes no mess. Typically, a home will take around two hours to insulate, depending on how big your house is and how accessible its external cavity walls are.