Although directed to the British system of Town and Country Planning this paper has relevance for many OECD countries, including some with systems of land use regulation which evolved entirely independently of the British. The paper starts by characterising the basic features of the British land use planning system, viewed from the resource allocation point of view of an economist. A conclusion is that the system explicitly excludes any use of price signals from its decisions. The paper then summarises the problems which the exclusion of price information has given rise to. Because the UK planning system has deliberately constrained the supply of space, and space is an attribute of housing which is income elastic in demand, rising incomes not only drive rising real house prices but also mean that land prices have risen considerably faster than house prices. Several housing attributes other than garden space are to a degree substitutes for land but the underlying cause of the inelastic supply of housing in the UK is the constraint on land supply. The final section proposes a mechanism which would make use of the information embodied in the price premiums of neighbouring parcels of land zoned for different uses. Such premiums signal the relative scarcity of land for different uses at each location and should become a ‘material consideration’ in planning decision-making. If they were above some threshold, this should provide a presumption of development unless maintaining the land in its current use could be shown to be in the public interest. If combined with Impact Fees, such a change would not only make housing supply more elastic and the system more transparent but would help to distance land availability decisions from the political process.