Affordable housing

"Affordable housing is housing which is deemed affordable to those with a household income at or below the median as rated by the national government or a local government by a recognized housing affordability index."  Wikipedia

A crisis of affordability

Commentators increasingly refer to a crisis of affordability in England. In the foreword to the June 2017 IPPR report, What more can be done to build the homes we need?, Sir Michael Lyons said: “We would stress that it is not just the number built but also the balance of tenures and affordability which need to be thought through for an effective housing strategy.”

Home ownership has been difficult to access in recent years, particularly for first-time buyers, while access to social housing is constrained by limited supply. The private rented sector has benefited, it now houses more households than the social rented sector. Private sector rent levels in high pressure areas have increased in response to demand. ...

Historically, homes for social rent (with rents at around 50-60% of market rents) and affordable home ownership have been the main source of new affordable housing. The introduction in 2011 of social sector units with rents of up to 80% of market rents has, in the view of some commentators, undermined the ability of even the social sector to supply housing that is truly affordable. 

https://commonslibrary.parliament.uk/research-briefings/cbp-7747/