Accessory dwelling unit regulations vary but results are consistently underwhelming in the D.C. region.

"Even though accessory apartments have become legal in parts of DC, Maryland, and Virginia over the past few decades, we have yet to see a renaissance of this housing type in our region," writes Tracey Hadden Loh.
The answer to the question of why accessory dwelling units (ADUs) are so hard to deliver at scale with the stated goals of zoning codes varies by jurisdiction, according to Loh. The article includes a list of current ADU regulations in the city of Alexandria, the District of Columbia, Fairfax County, Prince George's County, Montgomery County, and Arlington County, finding substantial differences in the "state of play" for each.
However, one councilmember in Montgomery County, Maryland has proposed legislation that would make eight changes to the county's zoning code to streamline ADU permitting to help produce results more in line with intensions.
Montgomery County Councilmember Hans Riemer's bill would: "Remove the prohibition on detached accessory apartments in small lot single family zones (R-200, R-90, and R-60)," and " Remove the prohibition on detached accessory apartments on lots smaller than one acre," among the six other changes.
Riemer's zoning text amendment is getting a public hearing today in Rockville, Maryland.
FULL STORY: Accessory apartments in Montgomery County: Still looking for the secret sauce

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

Congressman Proposes Bill to Rename DC Metro “Trump Train”
The Make Autorail Great Again Act would withhold federal funding to the system until the Washington Metropolitan Area Transit Authority (WMATA), rebrands as the Washington Metropolitan Authority for Greater Access (WMAGA).

The Simple Legislative Tool Transforming Vacant Downtowns
In California, Michigan and Georgia, an easy win is bringing dollars — and delight — back to city centers.

Albuquerque’s Microtransit: A Planner’s Answer to Food Access Gaps
New microtransit vans in Albuquerque aim to close food access gaps by linking low-income areas to grocery stores, cutting travel times by 30 percent and offering planners a scalable model for equity-focused transit.

This City Will Pay You to Meet Your Neighbors
A North Kansas City grant program offers up to $400 for residents to throw neighborhood block parties.

Commentary: Our Silence Will Not Protect Us
Keeping our heads down and our language inoffensive is not the right response to the times we’re in. Solidarity and courage is.
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.
Smith Gee Studio
City of Charlotte
City of Camden Redevelopment Agency
City of Astoria
Transportation Research & Education Center (TREC) at Portland State University
US High Speed Rail Association
City of Camden Redevelopment Agency
Municipality of Princeton (NJ)