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Featured Members: Featured Members are top-level SBN members who are deeply invested in a building a just, green, and thriving, local economy.

Locally-Owned: Privately-held businesses headquartered in the Greater Philadelphia Area (a requirement for SBN membership)

B Corp: Certified B Corporations are businesses voluntarily meeting higher standards of transparency, accountability, and performance, while offering a positive vision of a better way to do business. Learn more.

The Green Stormwater Infrastructure (GSI) Partners is a priority initiative of SBN working to advance the local GSI industry and innovation. Learn more.

111 W. Norris St.
Philadelphia, PA 19122
(215) 426-6466
Locally-Owned
B-Corp
GSI Partner
Experiments in building, dwelling and community. Onion Flats has been practicing in Philadelphia as developers, architects and builders since 1997. Our work has been published widely and has won national and international awards, focusing on innovated solutions for highly sustainable urban communities, including some of the first LEED & Passive House Certified projects in the region.
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