Accessory Dwellings

A one-stop source about accessory dwelling units, multigenerational homes, laneway houses, ADUs, granny flats, in-law units…

Strong Statewide ADU Reform Matrix

Legislative ADU activity has been coming at such a dizzying pace that it is extremely hard for anyone to keep up. For ADU enthusiasts, this is excellent news, of course.

The fact that States are now clawing back their zoning powers from jurisdictions is fairly new. I would pin this change to the lowly ADU, which helped to started this phenomenon in CA in 2017. The concept is now launching and evolving so quickly, that I predict the majority of States will have preemptive zoning to address statewide housing matters including ADUs but also middle housing, within a year.

August 7, 2025 · 2 Comments

Alan Durning Keynote Speaker at the Fall Build Small Live Large Summit

Conference is Sold Out!  Alan Durning, a long-time sustainability leader in the Northwest, is newly fired up—and for good reason. Since founding Sightline Institute in 1993, he has written more … Continue reading

August 21, 2015

Innovative “Junior” accessory dwelling unit Zoning Ordinance Passed in Novato, California

Novato, California will allow a simpler, lower-cost style of accessory dwelling unit starting in 2015 — the JADU or “junior accessory dwelling unit.”

December 14, 2014 · 2 Comments

Garage apartments in Houston

Houston, Texas has a long tradition of accessory dwelling units. It also has a unique lack of zoning rules. Could it be the next hotbed of ADU creativity?

November 19, 2014 · 4 Comments

What are the barriers to ADU development?

Government rules strongly limit the development of ADUs, but they are not the only factor.

August 21, 2014 · 10 Comments

Zoning Regulations for ADUs in 55 West Coast Cities

Oregon DEQ updated our ADU Zoning matrix recently in collaboration with Sightline Institute’s recent Legalizing Inexpensive Housing series.  Read the whole series – it’s great! A few of the cities stand … Continue reading

March 8, 2013 · 2 Comments