Cavity Wall Insulation

What is Cavity Wall Insulation?
Cavity Wall Insulation (CWI) is a simple process by which insulation is injected into this cavity through a carefully designed pattern of holes. The insulation system is designed so that any water that does enter the cavity can drain away, whilst the insulation reduces the heat loss through the wall.

With an uninsulated cavity heat can easily escape meaning it requires more fuel to maintain a comfortable temperature.

The insulation present in a filled cavity reduces this heat loss, making the property warmer, reducing the amount of fuel required to maintain a comfortable temperature.

The benefits of CWI:
  • Easy to install and only takes around 2 hours
  • Lasts the lifetime of the property (if the property is maintained)
  • Reduces your energy bills
  • Reduces global warming and climate change
  • Reduces heat loss 

Is CWI cost effective?
Although there is a cost to installing CWI, it takes a maximum of 5 years to repay these costs.  Therefore, you can save up to £610 a year on your energy bills. However, with the launch of the Green Homes Grant, CWI is listed as a primary measure. If you are ‘able to pay’, you can receive two thirds of the cost, capped at £5,000.
Can you receive CWI for free?
With the launch of the Green Homes Grant, if you live in England and are on income support you can apply for 100% of a grant, capped at £10,000. Look at our Installer List for more information.
How can you apply for CWI?
When you decide to install Cavity Wall Insulation into your property, ensure this is being completed by a trusted and regulated installer. Pick an Installer near you from The IAAs Installer List to ensure your property is covered by a 25 year guarantee Selecting an IAA Installer, you have the peace of mind knowing your installation is carried out by a regulated installer to the highest possible standard.