The act established that
planning permission was required for land development; ownership alone no longer conferred the right to develop the land. To control this, the act reorganised the planning system from the 1,400 existing planning authorities to 145 (formed from county and borough councils), and required them all to prepare a comprehensive development plan. These local authorities were given wide-ranging powers in addition to approval of planning proposals; they could carry out redevelopment of land themselves, or use
compulsory purchase orders to buy land and lease it to private developers. They were also given powers to control outdoor advertising, and to preserve woodland or buildings of architectural or historic interest – the latter the beginning of the modern
listed building system. The act provided that all development values were vested in the state, with £300 million set aside for compensation of landowners. Any land would be purchased by a developer at its existing-use value; after permission to develop was granted, the developer would be assessed a "development charge" based on the difference between the initial price and the final value of the land. This charge was not payable in all cases – for example, cottages for agricultural workers, or limited enlargements to houses, were exempt. These charges were theoretically assessed by the
Central Land Board, but it was intended that local district valuers would work with developers to agree a fair value; it was reported in 1949 that "where [a charge] is payable, the amount has been agreed by the developer in over 95 per cent of the cases". Where the landowner refused to sell land at the "undeveloped" price, the Central Land Board had authority to purchase it compulsorily and resell it to the developer. In order to assist local authorities to carry out major redevelopment, the act provided for extensive government grants. The Treasury would pay 50% to 80% of the annual expenditure for the first five years, depending on the financial situation of the authority; in exceptional cases, this could be increased to eight years. In areas of significant war damage, the rate was set at 90% of expenditure. After this initial period grants would continue, at a lower rate (50% in war-damaged areas, variable for others), for sixty years. Local authorities were given the power to raise loans to pay for this redevelopment, repayable over the same sixty-year period. Grants of 20–50% were available for related expenditure, such as the cost of acquiring land outside the main redevelopment areas.
Repealed enactments Section 113(2) of the act repealed 32 enactments, listed in parts I and II of the ninth schedule to the act. ==Amendments==