External Wall Insulation

In a non-insulated home up to a third of the heat you produce in your home disappears straight through the walls… wasting you £100’s every single year! Insulating your external wall insulation is an easy and effective way to reduce your heating bills by up to 40% per annum whilst keeping your home warmer. With energy suppliers increasing their bills year upon year, now is the time to make the move and consider external wall insulation.

Insulating your solid walls could cut your heating costs considerably, because solid walls let through twice as much heat as cavity walls do. The good news is they can be insulated – from the inside or the outside

If your home was built before 1920, its external walls are probably solid rather than cavity walls. Cavity walls are made of two layers with a small gap or ‘cavity’ between them. Solid walls have no such gap, so they let more heat through. Solid walls can be insulated – either from the inside or the outside. This will cost more than insulating a standard cavity wall, but the savings on your heating bills will be bigger too

How much could you save?

Type of Solid Wall InsulationAnnual SavingCarbon Dioxide Saving Per Year
External Around £490 1.8 Tonnes
Estimates based on insulating a gas-heated, semi-detached home with three bedrooms.

You might be able to reduce these costs by carrying out the work at the same time as other home improvements. And you could spread the cost by not tackling all the house at once – see below for how to keep the cost down.

External Wall Insulation

  • Can be applied without disruption to the household
  • Does not reduce the floor area of your home
  • Renews the appearance of outer walls
  • Improves weatherproofing and sound resistance
  • Fills cracks and gaps in the brickwork, which will reduce draughts
  • Increases the life of your walls by protecting the brickwork
  • Reduces condensation on internal walls and can help prevent damp (but will not solve rising or penetration damp)
  • Is best installed at the same time as external refurbishment work to reduce the cost
  • May need planning permission - check with your local council
  • Requires good access to the outer walls
  • Is not recommended if the outer walls are structurally unsound and cannot be repaired

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