While cavity wall insulation is first and foremost in the minds of most when it comes to insulating walls, it’s obviously not a solution for old solid-walled homes, which do not feature cavities. Options instead include applying insulation externally to the façade of the building, or internally — both could save up to £455 on annual heating bills, according to the Energy Saving Trust. The former will inevitably change the look of the building — not a bad thing in some cases.
Internal wall insulation seems, by comparison, an easier, cheaper and effective option. But there can be issues, not least having to remove all items such as radiators from the interior face of external walls. Internal insulation will change the nature of the building and it needs to be thought through properly.