In this paper we examine the impact of various housing policies from the perspectives of planners, investors, developers, public officials, and other stakeholders. Policies include those encouraging home ownership, help for first-time buyers, disincentivising housing as an investment asset, encouraging Build-to-Rent, and local authorities’ increased propensity to develop and invest in property. The focus is primarily on London, with more than 100 stakeholders having been interviewed for this research. We investigate developers’ and investors’ contributions to policymaking and discuss how to maximise the likelihood of successful policy implementation.