Get external wall insulation

Solid wall insulation can cut your energy bills by up to £650 a year(1) – and transform the look of your home.

House after insulation fitted
House before insulation fitted

External wall insulation prices start from £7,400(2)

You can make your home more energy-efficient and cosy. And give it a nice makeover. Choose from a range of finishing options, including modern render, pebble dash and brickwork.

external wall insulation being installed on a house

What is external wall insulation?

External walls can be insulated by adding an insulating layer, either on the inside or the outside, to prevent heat from escaping through your walls while keeping the cold out. This will cost more than insulating a cavity wall but the savings on your heating bills will be bigger too.

Wondering what the difference is between solid wall and a cavity wall? 

  • Solid walls have no gap, so they can’t be filled with cavity wall insulation.
  • Cavity walls are made of two layers with a gap or ‘cavity’ between them.


Solid wall brick pattern example
Solid wall brick pattern example 2
Solid wall brick pattern example 3

How can I tell if I have a solid wall?

Solid walls come in many different forms. Here are some common ways to tell if your home has solid walls:

  • It was built before 1920
  • The walls are less than 260mm thick
  • The brickwork looks similar to that in the photo

You might need to have planning permission before installing solid wall insulation — check with your local council before starting.

Why is external wall insulation a good idea?

A cold wall will take heat away from anything around it. Solid wall insulation adds a thermally protective layer to the outside of your home. Here are some more reasons for insulation:

Save up to £650 on energy bills

Less heat escaping means less energy used to heat your home, saving you up to £650 per year on bills

Transform your home

You can choose how your home will look on the outside to make it as good as the inside

Reduce your carbon footprint

Wasting less energy to heat your home means your carbon emissions will drop too

What our external wall insulation customers say

Before we were spending £25 to £30 per week on our gas and electricity during the winter and we had to have our heating on day and night. But now, the exterior wall insulation that has been installed keeps the cold out and the warmth in and we're spending much less.

Mrs W, Kingston

Before the external wall insulation we used to have our thermostat on 25 degrees most of the winter but now we only have it on 15 degrees, any higher and the property gets too warm. Also we are definitely saving money on bills.

Mr and Mrs T, Kingston

Other types of insulation to consider

thermal loft insulation roll

Loft insulation

from £800 professionally installed

Around 25% of your heating can be lost into through your roof - save up to £580 a year on energy bills

Cavity wall insulation - Installing cavity wall insulation

Cavity wall insulation

from £950 professionally installed

You could be losing 33% of heat through your walls - save up to £480 a year on heating bills

Insulation and energy-saving advice