In These Cities, Most New Housing is Under 441 Square Feet

With loosened restrictions on “micro-housing,” tiny units now make up as much as 66% of newly constructed housing.

1 minute read

June 15, 2025, 5:00 AM PDT

By Diana Ionescu @aworkoffiction


Bird's eye view of studio apartment design.

Wikideas1, CC0, via Wikimedia Commons / Wikimedia Commons

A growing share of new housing units in U.S. cities are ‘micro-apartments’ that measure under 441 square feet, according to a report by Mary Salmonsen in Smart Cities Dive. Cities with the highest percentage of micro-apartments in the pipeline include Seattle (66 percent), Boston (56.2 percent), and Newark (49.8 percent).

The growth of micro-apartments is due in part to the housing crisis and recent zoning changes made by cities to accommodate higher density and more housing. “Seattle’s wave of new micro-housing construction coincides with zoning reforms passed in 2024 that permit micro-apartments in all areas zoned for multifamily housing, according to the StorageCafe report.”

As far as existing housing goes, San Francisco has the highest share of micro-apartments, at 14 percent of its apartment inventory. Today, 28 percent of the city’s pipeline is small units. “Out of the top 10 cities with the largest share of micro-apartments, seven are located in the West, with only one — Philadelphia — on the East Coast.”

Thursday, June 12, 2025 in Smart Cities Dive

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

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.

June 11, 2025 - Diana Ionescu

Rendering of Shirley Chisholm Village four-story housing development with person biking in front.

San Francisco's School District Spent $105M To Build Affordable Housing for Teachers — And That's Just the Beginning

SFUSD joins a growing list of school districts using their land holdings to address housing affordability challenges faced by their own employees.

June 8, 2025 - Fast Company

Yellow single-seat Japanese electric vehicle drivign down road.

The Tiny, Adorable $7,000 Car Turning Japan Onto EVs

The single seat Mibot charges from a regular plug as quickly as an iPad, and is about half the price of an average EV.

June 6, 2025 - PC Magazine

White Waymo autonomous car driving fast down city street with blurred background at night.

Seattle's Plan for Adopting Driverless Cars

Equity, safety, accessibility and affordability are front of mind as the city prepares for robotaxis and other autonomous vehicles.

June 16 - Smart Cities Dive

Two small wooden one-story homes in Florida with floodwaters at their doors.

As Trump Phases Out FEMA, Is It Time to Flee the Floodplains?

With less federal funding available for disaster relief efforts, the need to relocate at-risk communities is more urgent than ever.

June 16 - Governing

People riding bicycles on separated bike trail.

With Protected Lanes, 460% More People Commute by Bike

For those needing more ammo, more data proving what we already knew is here.

June 16 - UNM News