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  • Rural Communities Embrace ADUs to Boost Housing Supply

    How planners, lawmakers, and residents are changing attitudes and zoning rules about accessory dwelling units in small towns.
    by: Kevin Hardy
    How planners, lawmakers, and residents are changing attitudes and zoning rules about accessory dwelling units in small towns.
  • New ADU Tools May Unlock Affordable Housing in Your Backyard

    From California to Arkansas, ready-made design plans can reduce time and costs during the permitting process.
    by: Jon DePaolis       September 26, 2024
    From California to Arkansas, ready-made design plans can reduce time and costs during the permitting process.
  • What's Blocking an ADU Boom?

    Accessory dwelling units are gaining national momentum, but these regulatory and financial hurdles still need to be cleared.
    by: Adina Solomon       September 09, 2021
    Accessory dwelling units are gaining national momentum, but these regulatory and financial hurdles still need to be cleared.
  • 3 Zoning Changes That Make Residential Neighborhoods More Affordable

    Zoning reform is one of our greatest weapons against rising housing costs. Here's how we can wield it.
    by: Robert Liberty
    After 100-plus years of prioritizing single-family zoning, cities and states are welcoming diverse housing types back to the neighborhood.
  • Practice Gentle Density

    Zoning Practice — February 2023
    by: Jacqueline Berg, AICP, John Houseal, FAICP       February 01, 2023
    This 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.
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  • The Connection Between Unpermitted ADUs in San José and the Need for Zoning Reform

    by: Grant Holub-Moorman
    Uncovering JAPA: Discover how policymakers are using computer vision to identify unpermitted ADUs in San José — shedding light on informal housing and the barriers to legal construction.
  • Beyond Use Zoning: The Role of Deregulation in Housing Equity

    Zoning Practice — May 2022
    by: John Zeanah, AICP       May 01, 2022
    This issue of Zoning Practice explores how accessory use standards, dimensional standards, and building codes affect opportunities to build missing middle housing. And it highlights how Memphis and other cities are looking beyond use zoning to advance goals of housing equity in reforming codes and policies.
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  • Housing Supply Accelerator Playbook

    May 06, 2024
    The Housing Supply Accelerator Playbook is for local elected officials and community planners working to boost diverse, attainable, and equitable housing supply in communities nationwide.
  • Portland, OR, City Code

    Updated June 2022
    This regulation belongs to 18 Research KnowledgeBase collections.
  • Iowa City, IA, City Code

    Updated July 17, 2018
    This regulation belongs to the Accessory Dwelling Units, Design Review, Environmentally Sensitive Areas, Food Trucks, Housing Supply Planning, Inclusionary Housing, and Transfer of Development Rights collections.
  • Minneapolis, MN, Code of Ordinances

    Updated November 2021
    This regulation belongs to the Accessory Dwelling Units, Active Transportation, Affordable Housing Programs, Built Environment and Health, Food Trucks, Green Building, Group Housing, Housing Supply Planning, Residential Infill Development, Rethinking Off-Street Parking Requirements, Shared Mobility, Social Equity, Solar Energy, Urban Agriculture, and Urban Livestock collections.
  • Spokane, WA, Municipal Code

    Updated June 2021
    This regulations belongs to the Accessory Dwelling Units, Climate Change, and Tactical Urbanism collections.
  • Kirkland, WA, Pre-Approved DADUs

    2024
    The City of Kirkland, Washington, offers a pre-approved detached accessory dwelling unit program.
  • San Diego, CA, Companion Unit Handbook

    2019
    This guide informs homeowners on how to construct a companion unit on their property in San Diego, California.
  • Eugene, OR, Municipal Code

    Updated May 2019
    This regulation belongs to the Accessory Dwelling Units, Active Transportation, Housing Supply Planning, Residential Infill Development, Rethinking Off-Street Parking Requirements, and Solar Energy collections.
  • Santa Cruz, CA, Municipal Code

    Updated September 2019
    This collection belongs to the Accessory Dwelling Units, Green Building, Housing Supply Planning, and Inclusionary Housing collections.
  • Boulder, CO, Revised Code

    Updated April 2019
    This regulation belongs to the Accessory Dwelling Units, Active Transportation, Environmentally Sensitive Areas, Food Trucks, Housing Supply Planning, Inclusionary Housing, Marijuana-Related Uses, Rethinking Off-Street Parking Requirements, and Solar Energy collections.
  • Responding to Changing Households: Regulatory Challenges for Micro-Units and Accessory Dwelling Units

    NYU Furman Center Working Paper, January 2014
    by: Vicki Been, Benjamin Gross, John Infranca
    This report belongs to the Accessory Dwelling Units, Affordable Housing Programs, Housing Supply Planning, and Tiny Houses and Micro-Apartments collections.
  • Bloomington, MN, Code of Ordinances

    Updated December 2019
    This regulation belongs to the Accessory Dwelling Units, Active Transportation, Affordable Housing Programs, Creative Placemaking, Green Building, and Housing Supply Planning collections.
  • Promoting Workforce Housing: Expanding Locations and Development Potential

    2008
    These models belong to the Accessory Dwelling Units, Affordable Housing Programs, and Housing Supply Planning collections.
  • Madison, WI, Code of Ordinances

    Updated March 2023
    This regulation belongs to the Accessory Dwelling Units, Creative Placemaking, Electric Vehicle Infrastructure, Housing Supply Planning, Outdoor Lighting, Rethinking Off-Street Parking Requirements, Solar Energy, Urban Agriculture, and Zoning Reform and Code Writing collections.
  • Santa Clara County, CA, Code of Ordinances

    Updated August 2018
    These regulations belong to the Accessory Dwelling Units, Home Occupations, Scenic View Protection, Solar Energy, and Wildland-Urban Interface collections.
  • Sparks, NV, Code of Ordinances

    Updated July 2021
    These regulations belong to the Accessory Dwelling Units, Content-Neutral Sign Regulation, Housing Supply Planning, Solar Energy, Urban Agriculture, and Zoning Reform and Code Writing collections.
  • A Room of One’s Own: Accessory Dwelling Unit Reforms and Local Parochialism

    Urban Lawyer, 45(3): 519–569, 2013
    by: Margaret Brinig, Nicole Garnet
    This article discusses the national trend in state and local regulations toward more permissive regulations for accessory dwelling units (ADUs) and presents the findings of a study of local regulations in California.
  • Accessory Dwelling Units: A Smart Growth Tool for Providing Affordable Housing

    Housing News Network, August 2016
    by: Jaimie Ross
    This article provides a general overview of accessory dwelling units (ADUs), discusses potential regulatory barriers to ADUs and state efforts to promote ADUs in Florida, and includes considerations for local zoning ordinances.
  • Accessory Dwelling Units: Case Study

    2008
    by: Sage Computing, Inc.
    This short report documents how six different localities regulate accessory dwelling units (ADUs) and discusses the potential benefits of removing regulatory barriers to ADUs.
  • Accessory Housing Is Part of the Solution

    Breakthroughs, January 2004
    This short article summarizes a number of common regulatory barriers to affordable housing. These barriers include process requirements, design standards, occupancy standards, and lot size and parking standards.
  • Temple Terrace, FL, Imagine 2040 Comprehensive Plan

    Updated January 2023
    This city's comprehensive plan belongs to the Accessory Dwelling Units, Capital Improvements Programming, Comprehensive Planning, and Housing Supply Planning collections.
  • Prince George’s County, MD, Plan 2035 General Plan

    Adopted May 2014
    The county’s comprehensive plan, which achieved Bronze-level recognition in APA's Comprehensive Plan Standards for Sustaining Places Recognition Program Pilot, includes several policy recommendations that support the development of accessory dwelling units.
  • Secondary Suites: A Guide for Local Governments

    2005
    This guide provides local governments in British Columbia, Canada, with information to help them develop regulations for accessory dwelling units.
  • Municipal Planning Guidelines for Secondary Suites

    2010
    This guide provides local governments in Manitoba, Canada, with information to help them develop regulations for accessory dwelling units.
  • Accessory Dwelling Units: Model State Act and Local Ordinance

    January 2021
    by: Coralette Hannon, Gerri Madrid-Davis
    This guide includes model state and local legislation to encourage the development of accessory dwelling units.
  • Charlottesville, VA, Code of Ordinances

    Updated April 2018
    This regulation belongs to the Accessory Dwelling Units, Active Transportation, Housing Supply Planning, and Short-Term Residential Rentals collections.
  • Coconino County, AZ, Zoning Ordinance

    Updated December 2023
    This regulation belongs to the Accessory Dwelling Units, Housing Supply Planning, and Outdoor Lighting collections.
  • Clallam County, WA, County Code

    2017
    The county’s zoning code permits internal, attached, and detached accessory dwelling units by right in all districts that permit single-family residences, subject to use-specific standards.
  • Mesa, AZ, Code of Ordinances

    Updated May 2021
    These regulations belong to the Accessory Dwelling Units, Design Review, Group Housing, and Housing Supply Planning collections.
  • Palmer, AK, City Code

    2016
    The city’s zoning code permits internal, attached, and detached accessory dwelling units by right in all residential and agricultural districts, subject to use-specific standards.
  • Port Aransas, TX, Code of Ordinances

    2016
    The city’s zoning code permits internal, attached, and detached accessory dwelling units by right in all zoning districts that permit single-family residences, subject to use-specific standards
  • Lexington, MA, Town Bylaws

    2016
    The town’s zoning code permits internal and attached accessory apartments by right in multiple residential districts and larger internal and attached or detached accessory apartments by discretionary approval in multiple residential districts, subject to use-specific standards.
  • Orono, ME, Code of Ordinances

    2015
    The town’s land use code permits internal, attached, and detached accessory dwelling units by right in all districts that permit single-family dwellings, subject to use specific standards.
  • Moscow, ID, City Code

    2017
    The city’s land use code permits internal, attached, and detached accessory dwelling units by right in all residential districts, subject to use-specific standards.
  • Santa Fe, NM, City Code

    Updated October 2019
    This regulation belongs to the Accessory Dwelling Units, Green Building, Historic Preservation, Housing Supply Planning, Short-Term Residential Rentals, and Wildland-Urban Interface collections.
  • Summit County, CO, Land Use and Development Code

    2017
    These regulations belong to the Accessory Dwelling Units, Food Systems, Housing Supply Planning, Urban Livestock, and Wildland-Urban Interface collections.
  • Sandpoint, ID, City Code

    Updated December 2018
    This regulation belongs to the Accessory Dwelling Unit, Housing Supply Planning, and Short-Term Residential Rentals collections.
  • San Francisco, CA, ADU

    2015
    by: Openscope Studio Architects
    This local guide explains property owner options for developing accessory dwelling units in San Francisco.
  • Accessory Dwelling Units: A Guide to Accessory Apartments in Charlottesville, VA

    2015
    This local guide explains property owner options for developing accessory dwelling units in Charlottesville, Virginia.
  • Accessory Dwelling Unit Manual

    2003
    This local guide explains property owner options for developing accessory dwelling units in Santa Cruz, California.
  • Fayetteville, AR, Code of Ordinances

    Updated November 2019
    This regulation belongs to the Accessory Dwelling Units, Green Stormwater Infrastructure, and Rethinking Off-Street Parking Requirements collections.
  • Bloomington, IN, Municipal Code

    Updated October 2019
    This regulation belongs to the Accessory Dwelling Units, Green Building, and Housing Supply Planning collections.
  • Maine Revised Statutes

    Updated October 2022
    by:
    These statutes belong to the Accessory Dwelling Units, Environmentally Sensitive Areas, Housing Supply Planning, Planning and Zoning Enabling Laws, Scenic View Protection, Tiny Houses and Micro-Apartments, and Transfer of Development Rights collections.

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