Duplexes

Two pastel green/blue front doors on duplex with decorative wreaths.

How Single-Family Conversions Benefit Both Homeowners and Cities

Converting single-family homes to triplexes can ease the housing crisis and offer affordable, flexible options for more households. Why is it largely illegal?

March 4, 2025 - Strong Towns

View of Missoula, Montana on a sunny day.

Montana Supreme Court Upholds Zoning Reform Bills

The decision invalidates a preliminary injunction that blocked two key housing bills.

September 8, 2024 - Daily Montanan

Maricopa County, Arizona

Arizona Legalizes ADUs and Higher Downtown Density Statewide

Two new laws require cities to permit ‘missing middle housing’ near city centers and ADUs on all single-family lots.

May 28, 2024 - The Real Deal

Aerial view of Anchorage, Alaska downtown with mountains in background at golden hour.

Anchorage Leaders Debate Zoning Reform Plan

Last year, the city produced the fewest new housing units in a decade.

March 28, 2024 - Anchorage Daily News

Nebraska capitol building against a blue sky

Nebraska Considers State Zoning to Increase Housing Density

The bills would require cities to adopt zoning regulations to allow duplexes and ADUs.

February 1, 2024 - Unicameral Update

Aerial view of Whitefish, Montana with fall colors and mountains in background.

Montana Judge Blocks Zoning Reforms

The decision reverses new laws once dubbed the ‘Montana Miracle.’

January 3, 2024 - Reason

Three two-story houses on residential street in Detroit, Michigan. Center house appears abandoned.

Detroit Launches Duplex Repair Program

The grants will help landlords repair aging multifamily affordable housing.

November 3, 2023 - City of Detroit

St. Paul skyline as seen from across river

St. Paul Approves Zoning Reforms

The zoning updates will permit multi-unit housing and promote transit-oriented development to boost the city’s housing supply.

October 20, 2023 - Pioneer Press

A map of zoning codes in the Michigan city of Traverse City.

ADUs, Minimum Lot Sizes, and Quadplexes Under Discussion in Traverse City

Zoning changes for everything from housing density to minimum lot sizes are under consideration for a city on the shores of Lake Michigan.

August 29, 2023 - The Ticker

An aerial view of downtown Iowa City.

Iowa City Hopes Zoning Amendments Will Increase Housing Supply, Diversity

Iowa City is planning ahead to ensure that housing supply keeps up with housing demand.

August 21, 2023 - The Gazette

A picture of the Vermont State Capitol building with fall colors on display on trees in the background.

Vermont Next State in Line to End Single-Family Zoning, Ease Parking Requirements

Both houses in the Vermont Legislature have approved legislation to preempt local land use regulations by rescinding single-family zoning and easing parking requirements throughout the state.

May 18, 2023 - VTDigger

Single-Family Neighborhood

Toronto Approves Multiplex Housing Citywide

The city hopes streamlining the construction of multifamily housing will slow the growth of housing costs and prevent the displacement of residents as the city grows.

May 15, 2023 - Canadian Broadcasting Corporation (CBC)

Curvy street lined with houses in Issaquah Highlands outside Seattle, Washington

Wealthy Washington Neighborhoods Could Remain Untouched by Zoning Reforms

Neighborhoods with preexisting internal contracts are exempted from new legislation requiring all Washington cities to permit duplexes and other ‘missing middle housing.’

April 26, 2023 - The Seattle Times

Aerial view of Montana state capitol building in Helena, Montana

Montana Passes Sweeping Legislative Package to Rescind ‘California-Style-Zoning’

The Montana State Legislature recently approved a package of zoning reform bills modeled closely on bills approved in West Coast states, including the state of California, in recent years.

April 16, 2023 - Business Insider

Facade entrance of typical townhouse with cherry blossom in Seattle, Washington, America. Colorful red siding of two story attached townhouse duplex with blooming pink flower near windows with blinds

‘Missing Middle Housing’ Bill Passes in Washington Senate

The legislation would permit duplexes and, in some cases, fourplexes in residential areas in most Washington towns.

April 12, 2023 - Crosscut

British Columbia residential Neighborhoods

British Columbia Asserts Provincial Control Over Density

The Canadian province plans to override local opposition to loosening zoning regulations that restrict the housing supply.

April 6, 2023 - The Globe and Mail

Aerial view of Decatur, Georgia with cloudy sky

Decatur Moves Closer to Legalizing Duplexes, ‘Missing Middle Housing’

A proposal to permit multifamily housing units in areas previously zoned for single-family homes passed its first hurdle, but requires a second vote to go into effect.

January 19, 2023 - Decaturish

Sunset view of downtown Gainesville, Florida

Gainesville Eliminates Single-Family Zoning

Gainesville is the first city in Florida to eliminate exclusionary zoning.

October 18, 2022 - The Gainesville Sun

Aerial view of downtown Reno, Nevada

Reno Development Aims for ‘Baked-In’ Sustainability

The Midtown Garden Homes infill project brings light density and sustainable materials to a neighborhood predominantly populated with single-family homes.

August 4, 2022 - Architect Magazine

San Francisco Houses

California Density Law Didn’t Kill the Single-Family Neighborhood

After the passage of a contentious zoning reform law that encourages ‘light infill’ in single-family neighborhoods, few California households have submitted applications to build extra units, largely due to onerous restrictions imposed by local laws.

July 11, 2022 - San Francisco Chronicle

Urban Design for Planners 1: Software Tools

This six-course series explores essential urban design concepts using open source software and equips planners with the tools they need to participate fully in the urban design process.

Planning for Universal Design

Learn the tools for implementing Universal Design in planning regulations.

Top Books

An annual review of books related to planning.

Top Schools

The definitive ranking of graduate planning programs.

100 Most Influential Urbanists

The who's who of urbanism, according to Planetizen readers.

Urban Planning Creators You Should Know

A short list of voices on social, video, and podcasting platforms.