Hundreds of thousands of London homes with planning permission remain unbuilt, a report has claimed.
Business group London First and accountancy firm Grant Thornton have published figures showing 135,404 residential units completed in the capital between 2010 and 2017, excluding small projects.
This is against a background of 357,451 schemes being awarded planning consent during the same time period.
The report said that just 29,701 of 54,941 homes given planning permission in 2014 had started on site by 2017.
This gave a 46 per cent ‘attrition rate’ – the percentage not started within three years – for 2017, according to the report, up from 33 per cent the prior year.
London First chief executive Jasmine Whitbread said: ‘Every year tens of thousands of new homes fall by the wayside, and the ongoing slide in planning permissions will only make things worse.
‘London’s housing pipeline appears to be cracked and, unless we get to grips with the housebuilding hold-ups, generations of Londoners will be priced out of a place to call home.
‘To tackle London’s housing crisis, boroughs must free up more land, government must enable more investment and developers must start building the homes we need.’
A spokesperson for London mayor Sadiq Khan said: ‘Since he took office, the mayor has been clear that one of his top priorities is building significantly more of the genuinely affordable homes Londoners so urgently need.
‘The level of affordable housing given planning permission has already increased dramatically from the low level of just 13 per cent of permissions toward the end of the previous mayoralty, to more than double that figure last year.
‘In recent months the mayor has made the case to the chancellor that more needs to be done at a national level to make sure planning permissions turn into new homes, and he hopes the current review commissioned by the government will give them the chance to support the sort of bold measures we need.’
A government spokesman said: ’We want to see homes built faster and expect house builders to deliver more homes and to a high quality standard. Our housing white paper set out a range of measures to drive up the delivery rate on planning permissions across the country.’