The following are taken from the riba information paper on 'brownfield versus greenfield' housing
The last government said 40 per cent of new housing should be on greenfield sites; the current government 50 per cent; the uk Round Table on sustainable development 75 per cent.
In December 1997, John Prescott ordered West Sussex County Council to increase by a third the number of new homes it must accommodate between 1994 and 2011, despite government inspectors supporting the council's figure.
In 1981, the average household size was 2.67 people. In 1996 it was 2.39, and in 2011 it is estimated that it will be 2.1.
A survey of government properties in October 1997 showed that it owned 20,000 which were vacant, though there was no split between residential and others. It is estimated that there are 100,000 empty homes in London alone.
Paris accommodates 20,000 people per square kilometre, while London manages only 8000.
A Llewelyn-Davies study suggests that 106,000 extra homes could be provided in the capital by building on gap sites, converting houses into flats, and exploiting backland areas.
A survey by British Gas Properties found 200,000ha of derelict land in towns and cities.