The ADU Movement Grows Around the Country

More states and cities are promoting backyard cottages, converted garages, and other add-on units. Are they making an impact?

1 minute read

November 26, 2024, 10:00 AM PST

By Diana Ionescu @aworkoffiction


Rendering of modern black and brown one-story backyard home design

One of the ADU designs pre-approved by Los Angeles. | United Dwelling / United Dwelling 2-Bedroom Backyard Home

The movement to legalize accessory dwelling units (ADUs) in cities and states around the country could have a not-insignificant impact on the housing crisis, writes Ben Ikenson in Yahoo News. “In the last four years, U.S. housing prices have skyrocketed by 47 percent, and longstanding housing shortages culminated in a deficit of more than seven million homes last year, ‘the result of more than a decade of underbuilding relative to population growth,’ according to Realtor.com.”

Now, seven states and more than one hundred local jurisdictions have taken steps to relax regulations around ADUs and promote their construction.

In the first two years after a law supporting ADUs passed in California, close to half of the permits for ADUs were issued in the Los Angeles area. The city has embraced the trend, developing a set of pre-approved plans homeowners can use to cut down on design and permitting costs. “Like its potential uses—multigenerational living, aging-in-place, generating rental income, and more—the housing type comes in various forms. In L.A., garage conversions represent a significant percentage of ADUs, but the state allows for a wide range of ADU possibilities, from fully detached stand-alone structures to junior suites attached to main houses, with separate entrances and kitchenettes.”

Thursday, November 21, 2024 in Yahoo News

portrait of professional woman

I love the variety of courses, many practical, and all richly illustrated. They have inspired many ideas that I've applied in practice, and in my own teaching. Mary G., Urban Planner

I love the variety of courses, many practical, and all richly illustrated. They have inspired many ideas that I've applied in practice, and in my own teaching.

Mary G., Urban Planner

Cover CM Credits, Earn Certificates, Push Your Career Forward

Logo for Planetizen Federal Action Tracker with black and white image of U.S. Capitol with water ripple overlay.

Planetizen Federal Action Tracker

A weekly monitor of how Trump’s orders and actions are impacting planners and planning in America.

June 25, 2025 - Diana Ionescu

Person wearing mask walking through temporary outdoor dining setup lined with bistro lights at dusk in New York City.

Restaurant Patios Were a Pandemic Win — Why Were They so Hard to Keep?

Social distancing requirements and changes in travel patterns prompted cities to pilot new uses for street and sidewalk space. Then it got complicated.

June 19, 2025 - Diana Ionescu

Aerial view of town of Wailuku in Maui, Hawaii with mountains in background against cloudy sunset sky.

Maui's Vacation Rental Debate Turns Ugly

Verbal attacks, misinformation campaigns and fistfights plague a high-stakes debate to convert thousands of vacation rentals into long-term housing.

July 1, 2025 - Honolulu Civil Beat

Low-rise Pearl Sreet mall in Boulfer, Colorado.

Boulder Eliminates Parking Minimums Citywide

Officials estimate the cost of building a single underground parking space at up to $100,000.

5 seconds ago - Boulder Reporting Lab

Two-story buildings with porches in walkable Florida neighborhood.

Orange County, Florida Adopts Largest US “Sprawl Repair” Code

The ‘Orange Code’ seeks to rectify decades of sprawl-inducing, car-oriented development.

1 hour ago - CNU Public Square

Aerial view of town of Wailuku in Maui, Hawaii with mountains in background against cloudy sunset sky.

Maui's Vacation Rental Debate Turns Ugly

Verbal attacks, misinformation campaigns and fistfights plague a high-stakes debate to convert thousands of vacation rentals into long-term housing.

July 1 - Honolulu Civil Beat

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.