Why is insulation so important for your home?

The Energy Saving Trust examines the importance of a well-insulated home to its energy efficiency.

By Hugh Metcalf | 1 October 2020

Insulation is clearly a priority for an energy efficient home. Energy Saving Trust addresses the key facts you need to know.


Research shows, as many as 40 per cent of us worry about how to heat our homes during the colder months without breaking the bank. While installing a heating system that reduces your energy bills is an attractive option, the key to reducing your reliance on heating altogether is to take a ‘fabric first’ approach. This means addressing the issues that allow heat to escape and cold air to enter your home.

mother and child sitting in window - green homes grant - granddesignsmagazine.com

Image: Getty Images


Around one third of all the heat lost in an uninsulated home escapes through the walls. This can be addressed with the installation of solid wall insulation or cavity wall insulation. Solid wall insulation can be applied to either the exterior of your home or the interior – each with its own pros and cons.

Cavity wall insulation is installed in homes with unfilled wall cavities by drilling into these cavities and filling with a spray foam insulation.

Both solid wall insulation and cavity wall insulation, alongside loft, floor and roof insulation are all covered as primary measures under the Green Homes Grant.

A warm home is an energy efficient home - green homes grant - grand designs magazine

Image: Getty Images