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Worker in goggles with screwdriver working on insulation. Drywall on wall beams, insulatin

Internal Wall Insulation

About 35% of all heat loss from UK homes is due to un-insulated external walls.


Internal wall insulation is perfect for solid wall homes where you can't alter the outside of the property.

If your home was built before 1920 there is a strong likelihood that your property has solid walls.

You can check your wall type by looking at your brick pattern.​ If some of the bricks are laid with the square end facing, the wall is likely to be solid. If the wall is stone, it is likely to be solid.

Internal wall insulation is installed on a room by room basis and is applied to all exterior walls.


Polyisocyanurate Insulated (PIR) plaster boards are usually used creating a dry-lined, insulated internal wall. The internal walls are then plastered to leave a smooth and clean surface for redecoration.

Bill savings and things to be aware of:

  • Can save between £195-£650 a year on your fuel bills depending on property size (Figures from the Energy Saving Trust and assume property is a gas heated home and sized between a small flat to a large detached home).

  • Not only will this make your house warmer in winter but it will also save you money by slowing the loss of heat through un-insulated walls.​

  • It will slightly reduce the floor area of any rooms which it is applied (roughly about 100mm per wall)

  • Can be quite disruptive to install and does require the removal and re-fixing of items such as switches and radiators.

  • Any issues with penetrating or rising damp must be rectified before install can commence.

  • Grant funding is available that can cover the full cost of installation (qualifying criteria apply).

To check if you are eligible under the ECO4 scheme, please click the button below and complete the online form. 

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