Duplexes

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?

Montana Supreme Court Upholds Zoning Reform Bills
The decision invalidates a preliminary injunction that blocked two key housing bills.

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.

Anchorage Leaders Debate Zoning Reform Plan
Last year, the city produced the fewest new housing units in a decade.

Nebraska Considers State Zoning to Increase Housing Density
The bills would require cities to adopt zoning regulations to allow duplexes and ADUs.

Montana Judge Blocks Zoning Reforms
The decision reverses new laws once dubbed the ‘Montana Miracle.’

Detroit Launches Duplex Repair Program
The grants will help landlords repair aging multifamily affordable housing.

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.

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.

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.

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.

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.

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.’

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.

‘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.

British Columbia Asserts Provincial Control Over Density
The Canadian province plans to override local opposition to loosening zoning regulations that restrict the housing supply.

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.

Gainesville Eliminates Single-Family Zoning
Gainesville is the first city in Florida to eliminate exclusionary zoning.

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.

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.
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City of Albany
UCLA Lewis Center for Regional Policy Studies
Mpact (formerly Rail~Volution)
Chaddick Institute at DePaul University
City of Piedmont, CA
Great Falls Development Authority, Inc.
HUDs Office of Policy Development and Research