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

Metrorail train pulling into newly opened subterranean station in Washington, D.C. with crowd on platform taking photos.

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).

June 2, 2025 - The Hill

Large crowd on street in San Francisco, California during Oktoberfest festival.

The Simple Legislative Tool Transforming Vacant Downtowns

In California, Michigan and Georgia, an easy win is bringing dollars — and delight — back to city centers.

June 2, 2025 - Robbie Silver

Color-coded map of labor & delivery departments and losses in United States.

The States Losing Rural Delivery Rooms at an Alarming Pace

In some states, as few as 9% of rural hospitals still deliver babies. As a result, rising pre-term births, no adequate pre-term care and harrowing close calls are a growing reality.

5 hours ago - Maine Morning Star

Street scene in Kathmandu, Nepal with yellow minibuses and other traffic.

The Small South Asian Republic Going all in on EVs

Thanks to one simple policy change less than five years ago, 65% of new cars in this Himalayan country are now electric.

7 hours ago - Fast Company

Bike lane in Washington D.C. protected by low concrete barriers.

DC Backpedals on Bike Lane Protection, Swaps Barriers for Paint

Citing aesthetic concerns, the city is removing the concrete barriers and flexposts that once separated Arizona Avenue cyclists from motor vehicles.

June 15 - The Washington Post