The Effects of Upzoning Single Family Neighborhoods on Supply and Affordability

As the housing crisis continues to grow, there have been dozens of policy options that have been proposed as potential solutions. Zoning reform has been at the forefront of policy conversations as a potential tool to combat exclusionary zoning” -defined broadly as a set of tools used by high-income communities to preclude the development of new housing in their communities. This paper attempts to model the impacts of modestly up-zoning single-family neighborhoods to allow for 2-4 unit buildings in six Bay Area cities to evaluate the effects of this hypothetical policy on overall supply and potential impacts on housing cost.