Cavity wall insulation

Grants for Cavity Wall Insulation

Most modern homes built with two walls making an outer and an inner layer. The gap between, known as the cavity gap, this can be filled with insulation to make the house more energy-efficient.

If your home has cavity walls, and they are suitable for cavity wall insulation, then you could apply for our specialist to insulate them for free under the Eco scheme.

If your house built after 1930, then your home is probably built with a cavity gap in the wall, but it will lack the insulation needed to make your home energy efficient.

Properties built before the 1930s were made with solid walls, meaning the outside walls are a single solid layer. After 1930 house building techniques shifted to build houses with a cavity gap.


The properties made with uninsulated cavity walls are suitable for eco grants, Our specialists' will create drill holes outside in the mortar joints of walls then inject polystyrene beads insulation through the holes until the cavity becomes filled.

Suppose you are in any doubt about whether you could have cavity wall insulation. We can carry out a free survey to determine if your walls are suitable for cavity wall insulation.

All our installers will be a member of the Cavity Insulation Guarantee Agency (CIGA), and all cavity wall insulations have a 25-year guarantee (independent insurance backed).

After your cavity walls are insulated, the only variation you should notice is that your home is more comfortable and more economical to heat.


  1. Please take a minute to complete our online eligibility form or call us 
  2. We’ll contact you to arrange a suitable date to complete our free energy survey.
  3. Once qualified, we will arrange the installation of your free eco measures with our fully qualified engineers.