External Wall Insulation (EWI) is usually only applied to solid walled homes. EWI is applied to the external surface of a wall and is covered by a weatherproof layer, usually render. External Wall Insulation does not affect room size of a house, unlike Internal Wall Insulation, but it does alter the exterior appearance of the house. EWI provides the best insulation of all of the internal and external wall insulation options.
What is External Wall Insulation?
Non-technical Considerations
External Wall Insulation on terraced housing or only one of a pair of semi-detached can be visually obtrusive if the whole row of houses is not to be treated, although various architectural styles, (Georgian, Victorian, Edwardian) can be replicated. You need to check whether buildings insurance (fire) is affected.
Planning Permission
Planning permission will normally be required for fitting solid wall insulation if it changes the external appearance of the home. Even if visual changes are likely to be minor, you are recommended to contact your local planning authority if the building is listed or is in a conservation area.
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