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External Wall Insulation
Service Type
External Wall Insulation
Provider Name
Snug Network, Telephone No.0800 840 6813
United Kingdom
SAVE UP TO £260 A YEAR WITH External Wall Insulation ENQUIRE NOW and start saving up to £260 on your household bills*

Installing external wall insulation with Snug Network can save you up to £260 per year*. Our installers can provide you with the best solution to reduce your heating bills and heat your home.

External Wall Insulation

External Wall insulation is usually a layer of insulation applied to the exterior walls of your home and then covered in a specific type of cladding and/or render. Houses built prior to the introduction of cavity wall insulation, before the 1920’s, are generally built using solid walls, which tend to allow more heat to escape, therefore the insulation method is different.

There are two types of external wall –

Solid – these walls are most often 2 bricks wide. Each row of bricks interlocks to create a solid brick wall of around 230mm. Solid walls can be insulated from inside the house or externally.

Cavity – these walls tend to be wider than solid walls. This is because there is a gap ranging from 20-100mm between the layers of bricks.

For further information on identifiying the type of walls you have plese see below.

External Wall Insulation. The Key Facts:

  • Easily installed with minimal disruption to the home
  • Floor area of your home is not reduced
  • Increases the walls lifespan by protecting the brickwork
  • Helps prevent damp and reduce condensation on internal walls
  • Improves the external appearance of your home
  • Reduces heating bills by 25%

Solid Walls

Solid walls are usually 2 bricks wide with each row of bricks interlocking to create a solid 230mm brick wall. These types of walls can either be insulated externally or from inside the house.

Whether you decide to go for external wall insulation or internal the process can become quite expensive, and even though there may be funding available, you will most likely have to contribute to the overall cost.

If you’re unsure what year your house was built there are other ways in which you can tell what type of walls are used. Solid walls can typically be identified by looking at the brickwork, the bricks will usually alternate between short and long bricks. If your property is rendered you will need to check the width of the wall, if this is less than 260mm, the wall is most likely solid.

Cavity Walls

Cavity walls tend to be much wider than solid walls and this is due to the fact rather than being a 9 inch thick brick wall they have a gap ranging from 20-100 mm between the two layers of bricks. Cavity walls can be identified by the structure of the bricks, if all bricks have been laid the same way it is likely to be a cavity wall. You can also measure the width of the wall, if this is more than 270mm the wall is more than likely a cavity wall.

Modern properties, (generally those constructed post 1983), may well have had cavity wall insulation, or alternatively a high density insulation board, installed during construction. Some of these insulation boards are termed full fill, i.e. they completely fill the cavity void, or are partial fill, i.e. they leave a residual gap in the cavity.

If you suspect that your property has a residual cavity of 40mm plus then the InstaGroup has BBA approved Blown Mineral Fibre or Bonded Bead Cavity Wall Insulation solutions that you may wish to consider in order that you can ensure that your home is fully insulated. A property survey, undertaken by a suitably qualified Snug Network Installer, would confirm the most suitable system dependant on the exact cavity width remaining and the type of pre-installed insulation board used. Other considerations would include, access restrictions, the external finish of the property and location.

* Estimates based on insulating a gas-heated home. See This is correct as of May 2016.

Funding & Incentives

Find out if funding and incentives could save you money on your insulation, heating or solar PV installations with the Snug Network.


Want to learn more about the products and services offered by the Snug Network? Find out on our frequently asked questions pages.

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