Today's budget announcement to build a garden city in East London will be welcomed by many who say London needs new family homes - but that's not the only shortage in the capital. There are thousands of people in need of social housing that simply doesn't exist any more.
Luke Hanrahan has been looking at why there's such a drastic shortage and what it means for London.
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.