At least half of the new homes built on London public land will have to be affordable, according to Sadiq Khan.
These affordable homes will also benefit from faster planning permission, as the mayor looks to implement a new approach to housing development.
The mayor’s new Supplementary Planning Guidance is designed to raise levels of affordable housing and speed up decisions in the planning system.
The new approach will give developers of private land a fast-track route through the planning process to bypass costly and lengthy negotiations.
Private developers must have at least 35% affordable housing to qualify, while those on public land must hit 50%. The aim is to raise the percentage of London’s affordable homes from the current 13%.
All developments should get underway within two years of planning permission being granted.
Releasing the guidance, Khan said: “The housing crisis is the biggest challenge facing Londoners today with too many people – particularly the younger generation – being priced out of our city, unable to afford a home.
“I’m determined to ensure we don’t have a repeat of what happened at Battersea Power Station, with developers unacceptably reducing the number of affordable homes on site after planning permission was granted.
“That’s why I’ve written to all councils offering City Hall’s expertise in robustly scrutinising applications to ensure we see the new and genuinely affordable homes built that Londoners desperately need.”