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External wall insulation
Frequently asked questions

What is External Wall Insulation (EWI)?

External Wall Insulation from Caparol coats your property with solid insulation material. The insulation is supplied in boards, which are mechanically fixed and adhered to the exterior. A basecoat is then applied, followed by a primer and finishing render chosen from a wide range of textures and colours to achieve the appearance you want (including a brick-effect). It’s particularly suitable for solid-walled properties, properties with narrow, irregular or damaged cavities, and for non-standard constructions. It also delivers great results on commercial buildings.

How does External Wall Insulation work?

External Wall Insulation hugely reduces the amount of heat lost through the walls of your property by trapping heat, preventing it from escaping to the external atmosphere. The insulation boards that are part of the system installed by Caparol have superior resistance to heat transfer, so more of the heat you put into your property stays where you intended it to. Technically, the u-value of your walls is being reduced (typically from 2 currently to 0.3 once EWI has been installed). A u-value is a measure of how much heat is transferred through a given material; the lower the value, the lower the heat transfer.

How much does External Wall Insulation cost?

Each property will have specific requirements, so it is difficult to give a guide-figure. Instead, Caparol commits to giving you a free survey and quotation so you will have an exact figure, so you can budget from your own resources or explore funding routes with our help. Simply contact us to arrange your free external wall insulation survey. Grants are available too which are explained in depth in our external wall insulation grants and funding page.

How long does External Wall Insulation take to install?

A typical installation takes 2-4 weeks. Caparol will ensure sufficient installation teams are employed to achieve this, regardless of the size of the building. The installation is weather-dependent though. The basecoats and renders cannot be applied when the outside temperature is below 5°C, nor in periods of very extreme hot weather. Also, the system should be protected from the rain. We will take all steps to protect your installation, but there may be times when we have to withdraw from site due to extremes of weather. This is always taken into consideration by the Caparol-approved installer team and any rescheduling will be clearly communicated to you.

Will there be any disruption for me or my tenants?

Caparol is committed to making any installation as smooth as possible. All work takes place on the outside of your building so you can live in the property as normal during installation. And, we can ensure that TV reception is not interrupted by arranging temporary fixing of the satellite dish or aerial during installation.

Meet Bob, Jen, John and Jill

Caparol’s video guide to External Wall Insulation

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Your home designer

Create an individual design for your house with our home designer tool. Preview the transformation of how your house can look with Caparol’s external wall insulation.

Discover the possibilities
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Energy Saving Tips

Trust the elephant to give you handy tips on how to become a more energy-efficient household. Take the steps to creating a brighter warmer future for your family.

Read more
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Before and After Photos

View a selection of our external wall insulation projects - see how Caparol can transform the look of your home, while saving you money.

See the transformation
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Energy Savings Calculator

Our energy savings calculator gives you an accurate figure of the potential fuel bill savings with external wall insulation.

Let’s do the maths
  • We are delighted with the clean fresh appearance of the property - it looks fantastic! We noticed immediately how much more comfortable the indoor climate is, and we’re making savings on fuel too. The Green Deal scheme helped us to renovate our property, improve its energy efficiency and reduce our carbon emissions.

    The Owner, Yew House, Hampshire

  • Our project was a large refurbishment project for us and Caparol‘s external wall insulation system was proving ideal. The Caparol team have been extremely supportive throughout, visiting site regularly to check on progress. The properties will be hugely improved not only aesthetically but in terms of saving money on bills.

    Contract Surveyor on the scheme for Plymouth Community Homes, Stuart Baker

  • We have been working with Caparol for over 10 years and have been delighted with its application and performance. It is very hard wearing and offers great durability, resulting in minimal maintenance for the home-owner.

    Plastering Contractor Director, Dave Watts

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Caparol UK

Whitebridge Way



ST15 8JS

United Kingdom

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