Research and analysis

In-situ measurements of wall U-values in English housing

A research report which measured the heat loss through walls (U- value) in English housing.


In-situ measurements of wall U-values in English housing

This file may not be suitable for users of assistive technology. Request an accessible format.

If you use assistive technology (such as a screen reader) and need a version of this document in a more accessible format, please email Please tell us what format you need. It will help us if you say what assistive technology you use.


On behalf of the Department of Energy and Climate Change, research consultancy BRE has carried out in-situ measurements of wall U-values in approximately 300 domestic dwellings in England, together with more detailed investigations in a subsample of those walls.
In addition, laboratory tests have been carried out in order to validate the method of measuring U-values. The research is important in order to understand how the walls of homes in the UK are performing in-situ in order to provide realistic estimates of current energy consumption, and to quantify the potential for energy efficiency improvements such as wall insulation.

Published 9 March 2015