Save up to £455 a year

Houses built before 1920 typically have solid walls with no cavity, so insulation can either be applied to the external or internal face of the wall. External Wall Insulation involves fixing a layer of insulating material to the outside wall, then covering it with a base coat render followed by a final, decorative finish.
  • Save up to £455 a year on your heating bills*. A house with solid walls can lose up to 45% of its heat through uninsulated walls. External wall insulation reduces heat loss and you can save up to £455 a year on your heating bills.
  • Improved appearance. The installation of external wall insulation and a new coat of render will completely transform the external appearance of your property.
  • Improved levels of comfort. Houses with solid walls are often cold and draughty. Installing external wall insulation means that the house will warm up more quickly and will stay warmer for longer. It can also help to eliminate condensation and mould growth.
  • Easy maintenance. The high performance render finish will protect your property against rain and cracking, and it will not need to be repainted.
*Source: Energy Saving Trust 2015. Based on insulating a gas-heated, detached house.


  • Renews the appearance of outer walls and can add value
  • Improves weatherproofing and sound resistance
  • Reduces condensation on internal walls and can help to prevent damp
  • Significantly reduces heating bills
  • Improves the comfort of your home
  • Increases the lifetime of the walls by protecting the brickwork

Internal Wall Insulation

Internal wall insulation can be used where the exterior façade of the property cannot be altered. This may be because it is in a conservation area, or where there are planning restrictions or simply where certain exterior features need to be maintained.

Case Studies

See how some of our previous customers have benefited from our products and services.

EWI Case Study – Byford
EWI Case Study – King