This thesis is comprised of four main chapters. Although the chapters are distinct works, they are related by their focus on housing and land markets and their reliance on urban economic theory and methods. They aim to contribute to the understanding of how these spatial markets function in order to work towards an improved implementation of urban policy. In particular this thesis tries to understand how house prices are determined by demand- and supply-side factors across different scales. It provides support for the idea that at a local level prices are determined by demand, in that they compensate for differences in locational amenities. It also investigates some of the consequences of price determination such as displacement of original residents from gentrifying neighbourhoods and welfare losses as a result of planning restrictions to development. The overall message that emerges from the body of work is that urban policy should pay close attention to the way that supply and demand interact to determine prices in markets for housing and land