External wall insulation

EWI_1External Wall Insulation (EWI) is used to insulate solid wall properties. It is installed externally and creates an insulated layer that is windproof and watertight. The surface is a protective render with decorative finish that improves the building’s appearance.


Why insulate?

Solid walls let twice as much heat escape than cavity walls, and EWI is one of the most cost effective measures for improving thermal efficiency in the home. Typically up to 45% of heat is lost through un-insulated solid walls (Source: National Insulation Association, 2014). Properties with external solid wall insulation, when heated, become warmer much quicker – and in the summer it keeps the heat out too. The Energy Saving Trust estimates solid wall insulation can cut fuel bills by up to £455 per year.


How does EWI work?

Our Knauf ThermoShell EWI system is designed to meet the specific needs of your property. It has BBA certification and is ideal for upgrading the thermal performance of your home while improving the external appearance. Insulation EPS boards are securely fixed onto the property and then a protective render with decorative finish is applied. Once completed our system will leave a weather proof finish that protects your home from the elements. All our EWI installers have completed a rigorous manufacturer training programme so that the system is always installed correctly and consistently.


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What funding is available?

ECO – Energy Company Obligation grant funding is available to most households, and may be available to cover up to 100% of installation costs.

Green Deal – make energy efficient home improvements using Green Deal finance, which you can repay through your energy bill savings.

HEEPS Cashback – Scottish Government scheme provides rebates of up to £5,800 on a variety of measures on qualifying properties.

HEEPS Loan – interest free loan of up to £10,000 for owner occupiers and registered private sector landlords.

To access funding, measures should be recommended in a pre-installation Green Deal Advice Report for the property and carried out by a certified Green Deal Installer.

We can help you access your funding at no additional cost.


Green Deal Installer

Green Home Systems Limited is accredited with NICEIC to install EWI systems through the Green Deal and ECO. This means that we are able to access grant funding and Green Deal finance.

As a member of SWIGA we provide a 25 year insurance-backed guarantee on all our EWI projects.

For more information please contact us.


Further information

For more information on external wall insulation we recommend the following websites:

Energy Saving Trust – providing free and impartial advice on energy efficiency

National Insulation Association – industry body setting and maintaining standards

Which?independent consumer advice



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