Knowledgebase Collection

Accessory Dwelling Units

Illustration depicting various types of accessory dwelling units.

Adapted from the ABCs of ADUs

An accessory dwelling unit (ADU) is a smaller, independent residential dwelling unit located on the same lot as a stand-alone (i.e., detached) single-family home. ADUs go by many different names throughout the U.S., including accessory apartments, secondary suites, and granny flats. ADUs can be converted portions of existing homes (i.e., internal ADUs), additions to new or existing homes (i.e., attached ADUs), or new stand-alone accessory structures or converted portions of existing stand-alone accessory structures (i.e., detached ADUs).

Internal, attached, and detached ADUs all have the potential to increase housing affordability (both for homeowners and tenants), create a wider range of housing options within the community, enable seniors to stay near family as they age, and facilitate better use of the existing housing fabric in established neighborhoods. Consequently, many cities and counties have signaled support for ADUs in their plans and adopted zoning regulations that permit ADUs in low-density residential areas.

From this page you can search for resources that provide background, policy guidance, and examples of local plan recommendations and zoning standards for ADUs from across the country. And you can filter these search results by various geographic and demographic characteristics.

APA Resources

Accessory Dwelling Units

This edition of PAS QuickNotes provides a primer on different types of accessory dwelling units (ADUs) and explains the benefits of making space for these units in single-family residential areas.

Read more

Zoning to Promote Garage Apartments

This edition of Zoning Practice details a proposal for zoning reforms to facilitate garage-to-apartment conversions. 

Read more

Zoning for Accessory Housing

This edition of Zoning Practice article outlines a strategy for incorporating accessory housing standards into local zoning codes and highlights a few examples of communities where this approach has been effective.

Read more

On Demand: Accessory Dwelling Units (ADUs), The Durango Experience

This session from the 2016 National Planning Conference highlighted how planners in Durango, Colorado, worked through various challenges associated with planning for and regulating accessory dwelling units.

Read more

ADUs in the San Francisco Bay Area

This APA Learn course explores the growth of ADUs in the San Francisco Bay Area and the successes and challenges in adopting the programs, plans, and strategies that have promoted this growth.

Read more

Seattle Fine-Tunes Backyard Cottages

This Commissioner article describes the Seattle Planning Commission's effort to encourage ADUs as a tool to address housing choice and affordability.

Read more

making room for mom and dad

This Planning magazine article tracks housing trends among multigenerational families, including increased demand for ADUs.

Read more


This Planning magazine article explores how ADUs can meet the housing needs of multigenerational families.

Read more

Planning for Accessory Dwelling Units

While many communities are interested in expanding housing choices by allowing ADUs in single-family areas, some residents of these areas may be concerned about ADUs changing the character of their neighborhoods or overburdening existing infrastructure. The research to date does not support fears about lower property values or parking shortages. Conversely, there are some indications that ADUs do increase the supply of affordable housing and do make significant economic contributions to their host communities, through construction activity and property taxes.

Conducting a housing needs assessment before drafting zoning regulations for ADUs can highlight demographic and spatial mismatches between the existing housing supply and the current and projected housing demand. Consequently, it may provide an indication of the total number of ADUs likely to be created in a given time period under a permissible regulatory scheme. Meanwhile, a residential design study can help proactively identify challenges associated with integrating ADUs into established single-family neighborhoods.

When cities and counties address ADUs in their comprehensive plans, they often include policy recommendations related to updating zoning regulations or providing public information about existing regulations. Some communities also explicitly identify land-use categories or place types where ADUs are appropriate.  

Zoning for Accessory Dwelling Units

Many cities and counties permit ADUs in one or more single-family zoning districts by right, subject to use-specific standards. Common provisions include an owner-occupancy requirement (for one of the two dwellings), dimensional and design standards to ensure neighborhood compatibility, and off-street parking requirements. Other relatively common provisions include minimum lot sizes and limits on the number of occupants or bedrooms. While some codes also include occupancy restrictions that stipulate that ADUs can only house family members or domestic employees, this type of restriction can severely limit the potential for ADUs to address a shortage of rental housing.

In some states, such as California and Vermont, localities must permit ADUs by right, under certain conditions. In some others, state laws pre-empt some aspects of local zoning for ADUs or actively encourage cities and counties to adopt permissive zoning regulations for ADUs.

Many older communities have an existing supply of illegally created ADUs. Some of these communities offer, or have offered, some form of limited amnesty to owners of illegal ADUs. These amnesty programs may waive permitting and inspection fees in exchange for owners registering their units, and they typically expire within a year or two of adoption.

Background Resources


View all reports


View all reports

Briefing Papers

View all briefing papers


View all articles

Blog Posts

View all blog posts

Case Studies

View all case studies

Online Training

View all online training


View all videos


View all statutes


View all guides

Model Ordinances

View all model ordinances

Comprehensive Plans

View all comprehensive plans


View all regulations

Web Pages

View all web pages

Related Collections