Citing Lack of ADU Development, Ann Arbor to Refine its ADU Ordinance

After legalizing accessory dwelling units in 2016, the city of Ann Arbor hasn't added many accessory dwelling units. Some regulations designed to limit the number of ADUs developed have made the building type impossibly cost prohibitive.

1 minute read

November 13, 2018, 7:00 AM PST

By James Brasuell @CasualBrasuell


Residential Development

Rungtiwa P / Shutterstock

"[The] Ann Arbor city council is considering ways to make it easier for homeowners to create accessory dwelling units on their property," reports Lauren Slagter.

After achieving very little development of accessory dwelling units (ADUs) since approving an ordinance to allow the construction and rental of accessory dwelling units in 2016, the Ann Arbor City Council is ready to retool the ordinance to encourage more development.

"The ordinance included restrictions intended to prevent the proliferation of ADUs across the city, and now city council thinks the restrictions may have worked too well," according to Slagter.

Most of the lack of ADU development in the city is credited to the high cost of building the units. According to Slagter, the city already dropped a previous requirement for every detached ADU to have its own water and sewer hookup, separate from the main house. Removing that requirement dropped the price of constructing an ADU by $20,000 to $30,000. Possible refinements of the city's ADU ordinance include removing maximum size regulations; removing minimum lot size requirements; allowing ADUs on lots with single-famly zones, regardless of zoning; and more.

Monday, November 12, 2018 in MLive

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

Get top-rated, practical training

Close-up of "Apartment for rent" sign in red text on black background in front of blurred building

Trump Administration Could Effectively End Housing Voucher Program

Federal officials are eyeing major cuts to the Section 8 program that helps millions of low-income households pay rent.

April 21, 2025 - Housing Wire

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.

April 30, 2025 - Diana Ionescu

Close-up on Canadian flag with Canada Parliament building blurred in background.

Canada vs. Kamala: Whose Liberal Housing Platform Comes Out on Top?

As Canada votes for a new Prime Minister, what can America learn from the leading liberal candidate of its neighbor to the north?

April 28, 2025 - Benjamin Schneider

Washington

Washington State’s Parking Reform Law Could Unlock ‘Countless’ Acres for New Housing

A law that limits how much parking cities can require for residential amd commercial developments could lead to a construction boom.

7 hours ago - Streetsblog USA

Bluebird sitting on branch of green bush.

Wildlife Rebounds After the Eaton Fire

Following the devastation of the Eaton Fire, the return of wildlife and the regrowth of native plants are offering powerful signs of resilience and renewal.

May 1 - AP News

1984 Olympics

LA to Replace Inglewood Light Rail Project With Bus Shuttles

LA Metro says the change is in response to community engagement and that the new design will be ready before the 2028 Olympic Games.

May 1 - Newsweek

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.