6. c. 51) was an Act of Parliament in the United Kingdom passed by the Labour government led by Clement Attlee.

The act provided that all development values were vested in the state, with £300 million set aside for compensation of landowners.

This charge was not payable in all cases – for example, cottages for agricultural workers, or limited enlargements to houses, were exempt.

In order to assist local authorities to carry out major redevelopment, the Act provided for extensive government grants.

After this initial period grants would continue, at a lower rate (50% in war-damaged areas, variable for others), for sixty years.