The mayor of London revealed the figures in his ‘A City for All Londoners’ report as he bids to create more homes in the capital.
Mr Khan revealed that last year alone nearly 70,000 new homes had been approved.
Since coming to office, Mr Khan has introduced various policies in a bid to create more homes for Londoners, including the doubling of affordable homes on a 10,000-home development.
In his report, Mr Khan admitted that building enough new homes was challenging and despite being available in principle, some land was difficult and expensive to build on.
To help developers, Mr Khan has instructed TfL to release disused land for housing developments.
In the report, Mr Khan also revealed he was in talks with the NHS and Metropolitan Police to release their surplus sites for the development of affordable housing.
Mr Khan hopes to maintain his and London’s target for 50% of new homes built in London to be affordable.
The Homes for Londoners team created by Mr Khan has been tasked with working with councils, housing associations, developers, housebuilders, investors and others involved in house construction to build the homes the capital needs.
“Building more of the right kind of housing is a huge challenge for London,” said Mr Khan.
“We will not fix the housing crisis overnight, but I have set out in this chapter what I will do to make a difference.
“Building enough housing is an important part of economic development – and, as I have demonstrated here, economic development will also help us to build more homes.”