Exclusionary zoning

Exclusionary zoning is the use of zoning ordinances to exclude certain types of land uses from a given community, especially to regulate racial and economic diversity.^[1] In the United States, exclusionary zoning ordinances are standard in almost all communities. Exclusionary zoning was introduced in the early 1900s, typically to prevent racial and ethnic minorities from moving into middle- and upper-class neighborhoods. Municipalities use zoning to limit the supply of available housing units, such as by prohibiting multi-family residential dwellings or setting minimum lot size requirements. These ordinances raise costs, making it less likely that lower-income groups will move in. Development fees for variance (land use), a building permit, a certificate of occupancy, a filing (legal) cost, special permits and planned-unit development applications for new housing also raise prices to levels inaccessible for lower income people.^[2]

Exclusionary land-use policies exacerbate social segregation by deterring any racial and economic integration, decrease the total housing supply of a region and raise housing prices. As well, regions with much economic segregation channel lower income students into lower performing schools thereby prompting educational achievement differences. A comprehensive survey in 2008 found that over 80% of United States jurisdictions imposed minimum lot size requirements of some kind on their inhabitants.^[3] These ordinances continue to reinforce discriminatory housing practices throughout the United States.^{[4][5]: 52–53}