Action Surrey: Surrey's Low Carbon Community

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Insulation: Solid Wall

Reduce your gas bills and save up to £435 a year*

Approximately 1/3rd of heat from a home is lost through the walls. Insulating the walls of your house is the equivalent to wrapping it in a thermal blanket.

Heat always flows from a warm area to a cooler area. Insulation between or on the walls slows this transfer of heat from the warm air inside the property to the cooler outside air.

How can solid wall insulation benefit you? Watch the video below to find out more:

How much could you save?

England, Scotland and Wales

 DetachedSemi-detachedMid terraceBungalowFlat

Fuel bill savings per year






Carbon dioxide savings (kgCO2/year)







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 2019.

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.

Internal Wall Insulation

Conventional internal insulation whilst effective, can be quite thick so may not be the best option for everybody. There are two different methods of internal wall insulation:

  1. Insulation plasterboard laminates. Ready-made insulation boards which can be fitted directly to the walls.
  2. Wooden battens fixed to the wall and infilled with insulation. Insulation between the battens can be mineral fibre or foam board.

Alternative to conventional internal wall insulation

New materials are now available that are much thinner and suitable for a wide range of uses. Some examples are Sempatap and Aerogel.

In many cases, these can be applied by competent DIY-er or by any handyman/decorator. The walls can then be decorated like normal afterwards with paint or wallpaper. Crucially, these types of materials can be cheaper than conventional internal insulation or external wall insulation though they do not provide the same thermal resistance. 

DIY-er installing a thinner wall insulation. 

They are particularly useful for unconventionally shaped walls or ceilings and for raising the temperature of walls to protect against condensation damp. 

Need more information?

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

Alternatively, fill out our enquiry form online to obtain a survey and no-obligation quote.

Enquire now

*all figures are taken from the Energy Saving Trust April 2019