What is External Wall Insulation?

External Wall Insulation can increase the warmth of your home by reducing heating loss by up to 45% and according to a government report published by the Department of Energy & Climate Change, it can also increase the value of your home by up to 14%.


Hover or click the numbers below for an explanation of each layer

  • 1

    Base Track & Insulation boards

    These are the insulation boards which are attached to your walls.

  • 2

    Base Coat

    This is a render upon which a variety of other finishes or finishing coats may be applied.

  • 3


    The reinforcement mesh helps to stop the render cracking and strengthens the system.

  • 4

    Thin Base Coat

    This is to cover the mesh.

  • 5

    Top Coat

    There are a range of top coats which can be applied such as a Silicone / Acrylic finish, an Enviromin coat, pebble dash, brick slip or brick render effect.


It takes approximately 3 to 4 weeks to fully complete all work on a 3-bedroom semi-detached house. Typically, larger homes will take longer, but this will for part of our initial free and no obligation survey.

The length of time taken to install EFI will depend on the size of your home but, as a guide, a typical 3-bedroom semi-detached house will take approximately 3-4 weeks from assembly to the dismantling of the scaffolding.

The purpose of External Wall Insulation is to insulate solid wall properties which can be made up of brick or concrete.

Most solid wall houses were built prior to the 1920s and are comprised of the Edwardian, Victorian or Georgian times. If you’re not entirely sure, you can find out by ideally checking your deeds, or manually drilling a test hole in the wall. Another way to test whether you’re eligible for External Wall Insulation would be to measure the wall thickness at an opening. Solid walls measure in the region of 225mm thick.

Most terraced houses in the UK are made up of a solid wall construction. If you currently live in a mid-terraced property, you can still use External Wall Insulation, even if your neighbours on either side choose not to by providing a ‘stop end’ at the edge of your boundary.

An External Façade Improvement could increase your house value by 14% or more*

Installing External Wall Insulation, also known as External Façade Improvement (EFI) also could increase your home’s value by 14% on average – and even as high as 38% in some parts of England.

Adding External Wall Insulation to the average home which will both increase it’s energy rating and enhance its appearance could mean adding more than £16,000 to the sale price of the property.

*(According to a Government report published by the Department of Energy & Climate Change.)

External Wall Insulation Must Follow Building Regulations

All of our External Wall Insulations fully adhere to building regulations. This means our installation must achieve a U-value of 0.30 watts / m2k. This means the expanded polystyrene must be at least 90mm thick, but we aim to make this thicker to increase performance of the insulation.

Some External Wall Insulation projects may require planning permission

Whilst planning permission isn’t normally required for an External Wall Insulation project, should decide to change the external appearance of your property, then this may require planning permission and will need to checked with your local planning authority.

Does External Wall Insulation help against damp?

As External Wall Insulation will help to increase the temperature of your walls and form a waterproof layer from the outside. It makes it a great way to protect your home from penetrating damp.


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