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The Forgotten Green Housing Option: Accessory Dwelling Units
Sightline, June 2018by: Margaret MoralesThis blog post highlights the environmental benefits of accessory dwelling units (ADUs). -
Walla Walla, WA, Municipal Code
Updated June 2021These regulations belong to the Accessory Dwelling Units, Housing Supply Planning, Residential Infill Development, and Zoning Reform and Code Writing collections. -
Apple Valley, MN, Code of Ordinances
Updated May 2022This city’s code of ordinances allows for accessory unit dwellings in one residential district type with a conditional use permit. -
Amherst, MA, Zoning Bylaw
Updated June 2022This town’s zoning bylaws permits contained, attached, and detached accessory dwelling units in certain residential districts. -
The ABCs of ADUs: A Guide to Accessory Dwelling Units and How They Expand Housing Options for People of All Ages
April 2019by: Eli Spevak, Melissa StantonThis guide explains the multiple benefits of ADUs for property owners and communities and highlights opportunities to support ADUs through zoning. -
Building an ADU
Version 1.0, Summer 2017by: Dana Cuff, Jane BlumenfeldThis guide is designed to help property owners in Los Angeles navigate city requirements to design and build new accessory dwelling units (ADUs). -
Burlington, VT, Code of Ordinances
Updated September 2021These regulations belong to the 13 collections, ranging from Accessory Dwelling Units to Zoning Reform collections. -
ADU Plans Gallery
2024This page provides users with pre-approved accessory dwelling unit (ADU) designs that abide by California's building code and are ready for site planning and construction. -
Oregon Comprehensive Land Use Planning Statutes
Revised Statutes §§197 and 197A, Amended 2019These statutes belong to the Accessory Dwelling Units and Planning and Zoning Enabling Laws collections. -
Hartford, CT, Zoning Regulations
Updated June 2020These regulations belong to the Accessory Dwelling Units, Food Systems, Form-Based Zoning, Housing Supply Planning, Tiny Houses and Micro-Apartments, Transit-Oriented Development, Urban Agriculture, and Zoning Reform and Code Writing collections. -
Decatur, GA, Code of Ordinances
Updated November 2024These regulations belong to the Accessory Dwelling Units, Food Systems, Housing Supply Planning, Tree Preservation and the Urban Forest, Urban Agriculture, and Zoning Reform and Code Writing collections. -
San Antonio, TX, Code of Ordinances
Updated July 2023These regulations belong to the Accessory Dwelling Units, Age-Friendly Communities, Food Trucks, Grayfields Reuse and Redevelopment, Green Stormwater Infrastructure, Historic Preservation, Home Occupations, Housing Supply Planning, Inclusionary Housing, Scenic View Protection, Solar Energy, and Tree Preservation and Urban Forest collections. -
Portland, OR, Comprehensive Plan
Updated March 2020This city's comprehensive plan belongs to the Accessory Dwelling Units, Affordable Housing Programs, Comprehensive Planning, Environmentally Sensitive Areas, Housing Supply Planning, Inclusionary Housing, Social Equity, Solar Energy, and Tree Preservation and the Urban Forest collections. -
Chapel Hill, NC, Code of Ordinances
Updated October 2019This regulation belongs to the Accessory Dwelling Units, Green Building, Housing Supply Planning, Inclusionary Housing, Residential Infill Development, Solar Energy, and Tree Preservation and Urban Forest collections. -
Olympia, WA, Municipal Code
Updated February 2023This regulation belongs to the Accessory Dwelling Units, Grayfields Reuse and Redevelopment, and Tree Preservation and the Urban Forest collections. -
Forsyth County, GA, Code of Ordinances
Updated February 2025The county’s unified development code belongs in the Accessory Dwelling Units, Housing Supply Planning, and Tree Preservation and the Urban Forest collections. -
Seattle, WA, Municipal Code
Updated April 2025This regulation belongs to 22 different Research KnowledgeBase collections, ranging from Accessory Dwelling Units to Youth in Planning. -
Expanding ADU Development and Occupancy: Solutions for Removing Local Barriers to ADU Construction
by: David Morley, AICP, Shannon GuzmanAccessory dwelling units (ADUs) are a valuable tool to help communities broaden housing choice in single-family neighborhoods. This guide is intended to help community leaders, planners, and housing practitioners and advocates take concrete steps to overcome specific barriers to expanding the local supply and legal occupancy of ADUs. -
Understanding the Motivations and Barriers to ADU Construction
by: Megan McGlincheyUncovering JAPA: What are the barriers to building ADUs? -
Equity in Zoning Policy Guide
by: American Planning Association February 08, 2023APA's Equity in Zoning Policy Guide positions planners to lead the way on zoning changes at the local, state, and federal level. -
Zoning to Promote Garage Apartments
Zoning Practice — May 2018by: Anne Brown, Vinit Mukhija, Donald Shoup, FAICP May 01, 2018American cities have a large supply of garages that could be converted into affordable apartments, but off-street parking requirements often stand in the way. This issue of Zoning Practice details a proposal for zoning reforms to facilitate garage-to-apartment conversions.List price$10.00ZP subscriber$0.00 -
Seattle Implements ADU Strategy with GIS to Expand Housing Choices
by: Keith CookeThe City of Seattle launched ADUniverse, using ESRI's ArcGIS to help residents understand their ADU options. -
Practice Gentle Density
Zoning Practice — February 2023This issue of Zoning Practice explores zoning strategies that balance the concerns of residents and the demands of the housing market by accommodating gentle density increases in a context-sensitive manner. From historic downtown neighborhoods to modern residential subdivisions, the tools presented can be used by planners throughout the country to implement housing policy through regulation. -
UC Berkeley Othering & Belonging Institute Zoning Reform Tracker
Updated November 2023This page includes a database and webmap to track zoning reforms across the country. -
Sacramento, CA, Shelf Ready ADU Plans
This web page provides construction plans for detached accessory dwelling units that are permit ready for Sacramento residents. -
Raleigh, NC, Raleigh ADU Fast Track Gallery
This webpage outlines the ADU Fast Track program and provides a gallery of approved Accessory Dwelling Units that have already been reviewed for Building Code compliance. -
ADUs to the Rescue?
In the fight to end the housing crisis, California is putting its money — and its legislation — on accessory dwelling units.February 01, 2020Five new California laws aim to reduce barriers to accessory dwelling units in single-family neighborhoods. -
Housing Policy Guide
by: American Planning AssociationAPA's Housing Policy Guide promotes specific, actionable guidance that builds upon the policy ideas first identified in the 2006 Housing Policy Guide and integrates the policy principles that make up APA's Planning Home Action Agenda. -
The Commissioner — October 2018
In The Commissioner's October 2018 issue: "Seattle Fine-Tunes Backyard Cottages," "On Quasi-Judicial Decision Making," "A New Approach to Redistricting," and "History at Your Fingertips."List price$5.00Members & subscribers$0.00 -
Zoning for Accessory Housing
Zoning Practice — July 2012by: Thomas DanielsThis issue of Zoning Practice 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.List Price$10.00ZP subscriber$0.00 -
Accessory Dwelling Units
PAS QuickNotes 19This 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.List price$10.00APA member & PAS subscriber$0.00 -
Accessory Dwelling Unit (ADU) and Unit Legalization Program
San Francisco turned to accessory dwelling units (ADUs) as a way to address the city's housing affordability crisis. The city worked with an architecture firm to develop a guidebook for homeowners and contractors for adding a unit to an existing residential building. -
Cottage Home Program
With the adoption of the 2016 Clovis Central Area Plan, the city now permits 400-square-foot cottage homes (i.e., ADUs) on the rear portion of single-family lots in the Old Town Clovis neighborhood.
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