Philadelphia Rowhouse Owners Embrace the 'Overbuild'

Quarters can be cramped for growing families in Philadelphia's many two-story rowhouses. Rather than decamp to the suburbs, more and more homeowners are simply adding a third story, known as an "overbuild."

1 minute read

July 10, 2018, 12:00 PM PDT

By Philip Rojc @PhilipRojc


Philadelphia Rowhouses

Mike Linksvayer / Flickr

"Think of them as a gentle form of densification," writes Inga Saffron on a growing Philadelphia trend. Faced with space constraints, many rowhouse owners are tacking third stories onto two-floor structures originally built for immigrant workers.

"These vertical additions, sometimes called 'overbuilds,' have always been a staple of rowhouse life in Philadelphia. But thanks to a decadelong boom in the real estate market and a change in the zoning code that allows taller houses, homeowners have embraced the overbuild with a vengeance."

While overbuilds have contributed to gentrification in some areas, they have their benefits. "Large suburban homes are still the norm in America, and overbuilds help Philadelphia compete by making it possible for people to continue living in the city as their families grow."

From an aesthetic angle, Saffron critiques an existing rule requiring third-floor additions to be set back eight feet from the front of the structure. "But why? Philadelphia has plenty of three-story rowhouses, and developers who build new houses aren't required to set back the third floor. What is the logic for pushing back the new structure, especially in neighborhoods that aren't part of a historic district?" 

Thursday, June 21, 2018 in Philadelphia Inquirer - Philly.com

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

Concrete Brutalism building with slanted walls and light visible through an atrium.

What ‘The Brutalist’ Teaches Us About Modern Cities

How architecture and urban landscapes reflect the trauma and dysfunction of the post-war experience.

February 28, 2025 - Justin Hollander

Complete Street

‘Complete Streets’ Webpage Deleted in Federal Purge

Basic resources and information on building bike lanes and sidewalks, formerly housed on the government’s Complete Streets website, are now gone.

February 27, 2025 - Streetsblog USA

Green electric Volkswagen van against a beach backdrop.

The VW Bus is Back — Now as an Electric Minivan

Volkswagen’s ID. Buzz reimagines its iconic Bus as a fully electric minivan, blending retro design with modern technology, a 231-mile range, and practical versatility to offer a stylish yet functional EV for the future.

March 3, 2025 - ABC 7 Eyewitness News

View of mountains with large shrubs in foreground in Altadena, California.

Healing Through Parks: Altadena’s Path to Recovery After the Eaton Fire

In the wake of the Eaton Fire, Altadena is uniting to restore Loma Alta Park, creating a renewed space for recreation, community gathering, and resilience.

March 9 - Pasadena NOw

Aerial view of single-family homes with swimming pools in San Diego, California.

San Diego to Rescind Multi-Unit ADU Rule

The city wants to close a loophole that allowed developers to build apartment buildings on single-family lots as ADUs.

March 9 - Axios

Close-up of row of electric cars plugged into chargers at outdoor station.

Electric Vehicles for All? Study Finds Disparities in Access and Incentives

A new UCLA study finds that while California has made progress in electric vehicle adoption, disadvantaged communities remain underserved in EV incentives, ownership, and charging access, requiring targeted policy changes to advance equity.

March 9 - UCLA Luskin Center for Innovation