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External Wall Insulation EWI

External Wall Insulation EWI


For some properties, a very effective way of increasing the insulation is to fit External Wall Insulation EWI.  As well as being highly efficient it also has the added benefits of less disruption and a pleasing aesthetic quality with many different varieties of finish available.


To insulate a solid wall from the outside, a layer of insulation material is fixed to the walls with mechanical fixings and adhesive, and then covered with protective layers of render or cladding.


The finish can be smooth, textured, painted, tiled, panelled, pebble-dashed for easy maintenance, or finished with brick slips to provide a real masonry brick finish.


The finish will cover the entire outside of your property, including existing brickwork, and may change its appearance. So check if you need planning permission beforehand:


  • in England and Wales, visit the Planning Portal website,
  • in Northern Ireland, go to the Planning Service Website.
  • in Scotland, visit the Scottish Building Standards Agency website


To prevent condensation, recessed areas around windows must be insulated as well as the walls – with the depth of insulation depending on the width of the window frame.


All external pipework and other fittings will have to be removed and replaced, and it may be necessary to extend window sills and even the roof overhang to protrude beyond the new layer.  It is often possible to fit additional sills to avoid replacing the original structure.


Cladding or render?


Cladding comes in a variety of attractive colours and forms:


  • timber panels or shingles
  • stone or clay tiles
  • aluminium panels
  • brick finish.


Render can be either a thick sand and cement mix applied over a wire mesh – or a thinner, lighter cement over a strong fibre mesh. Render is generally less expensive than cladding.


In our experience, EWI applied professionally on houses will give a 40-45% gain in heat efficiency.




Contact our team on 0121 241 5250 or email to discuss how KM Renewable Energy can meet your EWI requirements


KM Renewable Energy UK

Renewable Energy, Prefab Construction,

Energy Efficiency & Finance

25 Lee Bank Business Centre

Holloway Head


B1 1HP

0121 241 5250


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