ADU Business Booming in California

The number of Californians adding Accessory Dwelling Units to residential properties has quickly grown during the pandemic, according to industry sources.

1 minute read

July 21, 2020, 12:00 PM PDT

By James Brasuell @CasualBrasuell


Granny Flat

Nicolás Boullosa / Flickr

"Bay Area companies that specialize in backyard cottages are seeing a surge in interest from homeowners who suddenly need to create additional living space for elderly parents or adult children displaced because of the coronavirus," reports J.K. Dineen. 

"Some families are scrambling to move their parents out of assisted-living facilities, where the risks of contracting the coronavirus are high. Other erstwhile empty-nesters find themselves crowded as their young adult kids return from shuttered college campuses or look to escape small apartments in expensive cities like San Francisco or New York," explains Dineen of the trend. 

"Abodu, a San Jose firm that makes ADUs, estimates that 10,000 will be permitted in California in 2020, based on a survey of city permits."

Dineen provides historical background on California's efforts to legalize and streamline the construction of ADUs, in addition to a few anecdotes from residents who are working to quickly add an additional living unit to their property during the pandemic.


Saturday, July 4, 2020 in The San Francisco Chronicle

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

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

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.

July 9, 2025 - Diana Ionescu

Map of Haussmann's redesign of Paris in the 1850s through 1870s under Napoleon III.

In Urban Planning, AI Prompting Could be the New Design Thinking

Creativity has long been key to great urban design. What if we see AI as our new creative partner?

June 30, 2025 - Tom Sanchez

View of dense apartment buildings on Seattle waterfront with high-rise buildings in background.

King County Supportive Housing Program Offers Hope for Unhoused Residents

The county is taking a ‘Housing First’ approach that prioritizes getting people into housing, then offering wraparound supportive services.

July 11 - Real Change

Aerial view of suburban housing near Las Vegas, Nevada.

Researchers Use AI to Get Clearer Picture of US Housing

Analysts are using artificial intelligence to supercharge their research by allowing them to comb through data faster. Though these AI tools can be error prone, they save time and housing researchers are optimistic about the future.

July 11 - Shelterforce Magazine

Green bike share bikes parked in a row on a commercial street with outdoor dining and greenery.

Making Shared Micromobility More Inclusive

Cities and shared mobility system operators can do more to include people with disabilities in planning and operations, per a new report.

July 11 - Cities Today