Numerous policies in the U.S. and abroad have been designed to address the problem of inadequate supplies of affordable housing. Sophisticated secondary market mechanisms, inclusionary zoning, and land banking are three prominent tools, as well as tax and fiscal policies that result in reducing the cost of mortgages and the cost of borrowing. Other more recently promoted policy tools include relaxation of prohibitions against accessory dwelling units, and reduction of the amount of parking that must be built for a new structure.
Affordable housing is a controversial reality of contemporary life, for gains in affordability often result from expanding land available for housing or increasing the density of housing units in a given area. Ensuring a steady supply of affordable housing means ensuring that communities weigh real and perceived livability impacts against the sheer necessity of affordability. The process of weighing the impacts of locating affordable housing is quite contentious, and is laden with race and class implications.