Action Surrey: Surrey's Low Carbon Community

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Insulation: Solid Wall

Reduce your gas bills and save up to £650 a year*

Approximately 1/3rd of heat from a home is lost through the walls.  Insulation on the walls slows this transfer of heat from the warm air inside the property to the cooler outside air.

New installation regulations may require additional ventilation to be fitted as part of a solid wall install.

Watch the video below to find out more:

*Based on a gas heated, detached property.

Check your wall type

TIP: If you're unsure whether you have solid walls, check the brick pattern: The brick pattern will show alternating long and short sides of the bricks (see below for example).

If your house was built before the 1930s it is likely to have solid walls. Newer houses are more likely to have cavity walls. 

If you can see the brickwork on the outside of the house, look at the pattern of the bricks. If your home has solid walls, the bricks will have an alternating pattern like this:

If your home has cavity walls, the bricks will have an regular pattern like this:


Cavity walls need cavity wall insulation, more information can be found here

How much could you save?

England, Scotland and Wales

 DetachedSemi-detachedMid terraceBungalowFlat           

Fuel bill savings per year






Carbon dioxide savings (kgCO2/year)

1500 kg

910 kg

580 kg

610 kg

450 kg


These are estimated figures based on insulating a gas-heated home. The average installed cost is unsubsidised. Figures are based on fuel prices as of April 2022.

External Wall Insulation

External wall insulation is an extremely effective way to improve the thermal performance of the home, and is the only option for properties that do not have a cavity wall that can be insulated.

It will keep a property warmer in winter, and cooler in summer, while preventing damp and condensation on internal walls. It can also improve the outside appearance of a property. In some cases it can also reduce noise and increase the lifespan of a property (as the structure is protected).

Internal Wall Insulation

Solid walls can also be insulated internally. The Energy Saving Trust has produced a guide on this:

Internal Wall Insulation - Energy Saving Trust

Need more information?

For more information contact Action Surrey on 0800 783 2503 or email

Alternatively, fill out our enquiry form online and one of our team will be in touch.

Enquire now

*All figures are taken from the Energy Saving Trust April 2022.