Cavity Wall Insulation Grants

Around 35% of heat is lost through the external walls of your home. By installing cavity wall insulation, your home will warm up quicker and stay warmer longer and reduce those inevitable fuel bills by up to 25%. It also helps to inhibit mould growth that can form on cold external walls. Cavity wall insulation heat loss

Most homes built after 1930 can benefit by having cavity wall insulation.


The main benefits of installing Cavity Wall Insulation are:


  • Saves you money and keeps you warm
  • Totally dry and natural material
  • Increases the value of your house
  • Over 6 million dwellings insulated
  • Over 40 years of development
  • No known failures
  • Water repellent
  • Helps prevent condensation
  • Natural fire resistance
  • Resists vermin, inhibits mildew and fungi
  • Installed only by Approved Installers
  • Significantly increases Home Energy Rating
  • Environmentally friendly

Grants available for Cavity Wall Insulation - see how little you pay


Max m2
2/3 Bed Mid £149 58
 2/3 Bed Semi Bungalow £49 85
 2/3 Bed Semi/End Terrace £49 95
 2/3 Bed Det Bungalow £49 90
 3/4 Bed Detached House FREE 140/165

Properties over the maximum meterage (m2) are charged between £5 and £6 per m2.


You could qualify for FREE cavity wall insulation if you receive any of the following benefits:

  • Working Tax Credit
  • Child Tax Credit
  • Pension Guarantee Credit
  • Income Support
  • Income based Employment and Support Allowance
  • Universal Credit
  • Income based Job Seekers Allowance

Certain conditions may apply.

Free wall cavity insulation is only available for Home Owners or those renting privately. This grant is not available for Social Housing or Council tenants.

Applying is simple .. call us today on 0870 042 1267 or apply online.


You can apply for a grant for cavity wall insulation here

Apply for a cavity wall insulation grant

Thermal Image Comparison

Cavity wall insulation Infra red image of heat loss.

Ground-level infra-red image of typical Luton homes, showing an example with poor thermal insulation (left) and it's neighbour (right) with far less evidence of heat loss.

Frequently asked questions about Cavity Wall Insulation


Whitewool Cavity Wall Insulation. Download a PDF brochure here.

Also interested in Loft Insulation - Click Here



Cavity Wall Insulation Materials

The most common forms of wall cavity insulation used in the UK today are the mineral wools and bonded bead. The material grouped under mineral wool, are Rockwool, Whitewool, and Yellow wool. The materials grouped under bonded bead are white bead and grey (carbon) bead. Your surveyor will determine which product is suitable for your home.


Suitable properties for cavity wall insulation

Most properties built after 1935 have cavity walls. The majority of properties will be suitable for wall insulation. However certain types of houses are not suitable such as, timber framed, concrete houses, steel framed, and other system built houses. If your property suffers from damp, your surveyor will need to determine what type of damp you have.


If your home has black mould on cold external walls then cavity wall insulation may help. If your home has a problem with penetrating damp then cavity wall insulation will not be suitable. Penetrating damp can be either coming from below the ground or across the walls. Penetrating damp doesn’t appear as black mould but the plaster will be bubbling and coming away from the wall. Your surveyor will give you further advice.


Cavity Wall Insulation Grants

Because cavity wall insulation is one of most cost effective ways of saving money, government grants are available to help homeowners. Grants of up to 100% are available. Click on the link for more information on cavity wall insulation grants.


How it's installed

Before cavity wall insulation is installed, a survey needs to be carried out to ensure that your property is suitable for cavity wall insulation. If your home is suitable, your home assessor will make all the necessary arrangement to get the work carried out. This includes completing all paperwork to claim the grant. If your assessor deems you are eligible to have the work done free then you pay nothing at all and the grant is paid directly to the appointed contractor once you sign to completion form saying that you are happy with the work.


The work in most cases is carried out all from the outside. Small holes, around 22mm (about the size of a 10p coin) is drilled through the mortar joints. The insulation is then blown in. The holes are then made good with matching mortar.


If your house is rendered then your installer will have to drill directly through the rendering. Some companies will touch up the holes with a similar coloured paint if it is of a standard colour such as white, cream or magnolia. If your home is not one of these standard colours then you may need to supply the paint or make arrangements in the future to get it touched up yourself. If we come across a rendered property we will always try to put you with an installer that will touch up the paint work.


All installers on the scheme are approved by the British Board of Agrement (BBA) and offer the 25 year guarantee issued by the Cavity Insulation Garantee Agency (CIGA).