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How can zoning rules limit the construction of affordable housing?

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Aerial view of Paris showing broad, radiating boulevards lined with historic buildings, demonstrating Baron Haussmann's city planning design. — urban planning Georges-Eugène Haussmann's modernization plan transformed many areas of Paris through the addition of wider boulevards, better lighting and water sanitation, new parks, and improved rail transportation.

Zoning rules can limit the construction of affordable housing primarily through exclusionary practices that mandate specific types of development. By requiring large single-family residences on expansive lots, zoning ordinances effectively restrict the availability of housing options suitable for low-income households.1

Modern zoning codes often employ a multiplication of districts that further subdivide residential areas based on density and building type, such as limiting construction to single-family detached houses. These regulations, while intended to preserve property values and organize urban space, can prevent the development of more affordable, higher-density housing like apartment buildings or multi-family dwellings.21

In some jurisdictions, these exclusionary practices have faced legal challenges, leading courts to strike down certain ordinances and prompting the passage of remedial legislation to address the resulting housing shortages. Ultimately, while zoning is a vital tool for achieving physical order and protecting residents from incompatible land uses, its application can create significant barriers to housing affordability when it restricts the variety and density of residential structures.123