Housing Supply by Local Authority
We have previously written and talked about about the challenges with housing supply data. To help understand the problems with the data and housing supply trends in local markets, we have produced the following charts summarising some of the key housing supply data for local authorities across England. They contain the following data:
New Build Energy Performance Certificates (EPCs) – these are a good leading indicator for total housing supply – MHCLG Table NB1
Indicators of New Supply – the most frequently used housebuilding data showing quarterly new build completions but undercount delivery in some markets – MHCLG Table 253a
Net Additional Dwellings – Perhaps the best measure of supply and includes other contributor such as changes of use, conversions, and demolitions. Only available annually so we’ve interpolated the data to create a quarterly series – MHCLG Table 122
New Build Completions – This is the new build completions component of the net additional dwellings measure and is also only available annually – MHCLG Table 123
The issues with the housebuilding data can be seen by comparing the chart for Cotswold with the one for Birmingham. The Cotswold chart shows some consistency across the various measures and suggests the Indicators of New Supply data is a reliable guide to housebuilding activity in the area. However, the Birmingham chart shows that the Indicator of New Supply data has completely failed to capture the increase in activity in the city in recent years and so should be ignored.
Click the images below to open full sized versions.