One Obstacle to ADU Construction in California: The Price of Permits

The price of a permit to build an accessory dwelling units in the city of Thousand Oaks in Southern California is prohibitive—putting the permitting fee in opposition to the stated intent of the city's zoning code and state law.

1 minute read

January 30, 2018, 11:00 AM PST

By James Brasuell @CasualBrasuell


California

Niceley / Wikimedia Commons

It's rare that we post a submission from the letters to the editor section of a newspaper's editorial page, but a letter by Trevor Hughes to the Thousand Oaks Acorn is informative of how California's 2016 law, SB 1069, is playing out at the local level.

According to Hughes, AB 1069 paved the way for Thousand Oaks to adopt accessory dwelling unit criteria—a development that he welcomed and hoped to take advantage of at his home as his parents age. However, Hughes reports he was "shocked and appalled to discover that the permitting fees alone in Thousand Oaks are $13,190 to $26,325." According to Hughes, that explains why only 11 property owners have applied for ADUs in Thousand Oaks.

Hughes is responding to a news article by Becca Whitehall that examines the slow response to the new ADU rules in Thousand Oaks without settling on an explanation for why residents haven't sought more permits.

The Thousand Oaks example is not the first reported case of localities struggling to meet the mandates of the state law. Irvin Dawid reported in December 2017 on the example of Santa Rosa. On the other hand, a recent study by the Terner Center for Housing Innovation at the University of California, Berkeley found evidence of rapid growth in ADU permitting in other cities since the adoption of the law. 

Tuesday, January 30, 2018 in Thousand Oaks Acorn

Young Professional

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 and Environmental 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 and Environmental Planner

Get top-rated, practical training for planners

"Planetizen federal action tracker" logo superimposed over black and white image of US Capitol dome.

Planetizen Federal Action Tracker

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

September 16, 2026 - Zachary Whalen

Overlapping highways

The state-sanctioned urbicide of Austin

People don’t kill cities. Freeways do.

September 8, 2026 - Benjamin Schneider

The Hoover Dam blocking the Colorado River. The river's water level is noticeably low. The cliffs surrounding the blue water are brown and jagged.

US to reduce Colorado River water deliveries to Mexico

A new Colorado Treaty amendment reduces Mexico’s Colorado River water allocation by 250,000 acre feet.

September 11, 2026 - The Arizona Republic

A cluster of wind turbines beneath a stormy sky, above a forest where the leaves are beginning to change colors.

5 New England states march closer to 800 megawatt wind energy project

Securing federal approval for the project may be complicated under the Trump administration, which has historically been hostile towards domestic wind power.

7 hours ago - Inside Climate News

People boarding a bus on Maryland's Orange Route.

Baltimore to break ground on $50 million Transit Priority Project

The project will bring faster bus trips, safer streets and better bike connections to Baltimore.

September 16 - Mass Transit

A brick building with a circular sign with the Airbnb logo hanging off of it.

Airbnb launches $250 million 'last-dollar financing' housing accelerator, makes first investment in Austin

The company will put $6.4 million towards affordable housing development in Texas’ capital.

September 16 - Smart Cities Dive

FREE Course: Walkable City 1: Why Walkability?

After describing his path towards focusing on walkability as the essence of good planning, Jeff Speck marches through his five principal reasons for making more walkable places.

Reinventing Malls: Planning Alchemy—Turning Gray Fields Into Gold

The course focuses on the opportunities and imperatives that shape reinvention of mall sites.