According to homeless charity Shelter, Single people in London face the greatest barriers to home ownership.
A single person could need over 29 years to save enough for a deposit unless they can find a partner, trapping many in uncertain private renting or forcing them to live with their parents well into adulthood.
Luke Hanrahan reports:
Luke Hanrahan has been investigating what's behind London's housing shortage and the impact it's having on those who live here.
The mayor believes the economic recovery should force developers to rethink their commitment to social housing.
The jury is still out on the Help to Buy scheme, designed to help people take their first steps on the property ladder.