External wall insulation

Transform the outside of your property with external wall insulation and save up to £375 per year on heating bills(1) by preventing heat loss.

Act now to claim up to £5,000 off with the Green Homes Grant - deadline 31st March 2021.

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House after insulation fitted
House before insulation fitted

You could pay just £2,516 to completely transform your home(2)

The Green Homes Grant means you could get two-thirds off the cost of external wall insulation up to the value of £5,000, or if you're a low-income household you could get it free up to £10,000.

There's never been a better time to consider it.

A bonus is you can change the exterior of your property to fit your style. There's a range of finishing options available, including modern render, pebble dash and brickwork.

external wall insulation being installed on a house

What is external wall insulation?

If your home was built before the 1920s, it's likely the external walls are solid walls rather than cavity walls.

  • 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 walls can be insulated by adding an insulating layer, either on the inside or the outside, to prevent heat 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.

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 but there are some common ways to tell if your wall is solid or not:

  • was built before 1920
  • has walls less than 260mm thick
  • has brickwork like below
     

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.

Save up to £375 on energy bills

Less heat escaping means less energy used to heat your home, saving you up to £375 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

Get 66% off now

Claim Green Homes Grant vouchers to cover 66% of the cost

What our 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

How can I fund my external wall insulation?

There's other insulation to consider

thermal loft insulation roll

Loft insulation

from £136

Around 25% of your heating can be lost into through your roof - save up to £250 a year on energy bills(3)

Cavity wall insulation - Installing cavity wall insulation

Cavity wall insulation

from £204

You could be losing 33% of heat through your walls - save up to £280 a year on heating bills(4)

Insulation and energy-saving advice