The US housing market is facing a shortage of millions of homes, an outcome that has pushed homes out of reach for most low- and middle-income households.  But the supply crisis is actually a collection of disjointed problems with varied underlying causes: state and local zoning regulations and building code requirements, high material prices, a construction labor shortage, and financing challenges for low-cost housing.  Each problem needs to be addressed individually and locally. This brief evaluates the single-family supply crisis and provides recommendations that can move the needle in the right direction.