The IEA said just 3.9 per cent of London's green belt
would be needed to build 1m homes.
In Sandwell 17 per cent of green belt
land has been developed, while the figure in Walsall is 11 per cent and in Dudley it is nine per cent.
A spokesman for the Ministry of Housing, Communities and Local Government said that they had expanded on the green belt
over the past 20 years.
The government says it attaches "great importance" to green belt
land and that, once set, it should only be altered in "exceptional circumstances".
Sunderland City Council have previously said all sites meet "exceptional circumstances" needed to justify developing on the green belt
. This includes issues around "tightly constrained" green belt
boundaries and the need for additional housing in the area to drive economic growth.
A slice of green belt
that had been under threat in 2016, Sidebottom Fold in Stalybridge, has been removed from the framework, scrapping plans for 650 homes on the site.
"'Very special circumstances' will not exist unless the potential harm to the green belt
, by reason of inappropriateness, and any other harm, is clearly outweighed by other considerations."
Draft proposals for green belt
in Cheshire were first drawn up in the 1960s to prevent the outward spread of development from Greater Manchester and the Potteries.
"As they sell off and gobble up the Green Belt
to build low density, unaffordable housing, young families go on struggling to afford a place to live.
The figures are in stark contrast to neighbouring boroughs, withHarrowbuilding just two per cent, andHounslowbuilding only one per cent of new houses on green belt
'We purchased land near the green belt
but the SDDA officials sold the green belt
illegally after cutting all the trees,' said Amanullah, another resident of the township.
Kempton Park has been rated "strong" and although the council stresses Arup's report is not a policy or decision-making document on the release of green belt
land for development it will form a key part of Spelthorne's evidence base for its local plan review.