We still don’t know how many homes are built in the UK each year. Housing data has historically come from the National Housebuilding Council (NHBC) – an organisation established to provide warranties on new homes. But NHBC’s market share has deteriorated in the last few years – from 85% to 60% – which means a significant proportion of homes aren’t counted. By comparing to other records, like council tax, it’s estimated that half of new homes in London were missed in 2023.