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About 35% of heat is lost through walls 

Look at the pattern of the bricks on the house as this can show how the wall has been built.

Internal wall insulation

ls done by fitting rigid insulation boards to the wall, or by building a stud wall filled in with insulation material such as mineral wool fibre.  Can be done room by room when redecorating or renovating.

  • Is generally cheaper to install than external wall insulation.

  • Will slightly reduce the floor area of any rooms in which it is applied (the thickness of the insulation is around 100mm).

  • Can be quite disruptive but can be done room by room.

  • Requires skirting boards and external fittings to be removed and reattached.

  • Cannot be done before fixing any problems with penetrating or rising damp.


External wall insulation

External insulation will also cost less if you fit it when you’re having other work done to the outside. If you’re having a new roof, or painting the windows, or even having solar PV panels fitted, then you will probably have scaffolding up already, which can save a bit on the costs. If your walls need repointing or other repair work, it’s worth getting a quote for a complete refurbishment including insulation – it will probably work out cheaper than doing the two things separately.  Costs are in the region of £170/200m2.

The finish can be smooth, textured, painted, tiled, panelled, pebble-dashed, or finished with brick slips.

  • Can be applied without disruption to the household does not reduce the floor area of your home.

  • Fills cracks and gaps in the brickwork, which will reduce draughts, as well as renew the appearance.

  • Increases the lifespan of your walls and improve weatherproofing and sound resistance. 

  • Reduces condensation on internal walls and can help prevent damp (but will not solve rising or penetration damp).

  • Best installed at the same time as external refurbishment work to reduce the cost.

  • May need planning permission – check with your local council.

  • Not recommended if the outer walls are structurally unsound and cannot be repaired.


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