What’s New for Mass Timber Construction Under Philadelphia’s 2021 Codes
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Probably the biggest change in the 2021 I-Codes is the introduction of three new construction classifications: Type IV-A, -B, and -C, which together address structures built of mass timber. If you are a builder and think a different code change…
2021 Codes are Here!
As prophesied (we had a blog post about it), the Great Changing has come to pass (on schedule): on July 1, the Philadelphia 2021 building codes took effect! As we explained previously, the switch technically happened back on January 1,…
Philadelphia’s New Building Codes
Way back in January, a few wise sages warned of the Changing of the Building Codes: they said “the City of Philadelphia’s new building codes will go live in July 2025,” referenced this document, and promised to “examine the 2025…
The Philadelphia Commercial Activity License
Update: An earlier version of this article described the very inconvenient process by which Philadelphia’s Department of Revenue would transition an existing tax ID number to their current online system. In October 2025, Revenue mercifully updated that process, and this…
Grandfathered Zoning Rules in Philadelphia: An Update
At the beginning of 2025, we told passionate, dedicated readers of the Permit Philly blog (we assume there are millions of you) that the City of Philadelphia was going to crack down on grandfathered zoning. Saying a property is “grandfathered…
Air Management Services
Philly’s hottest new municipal office is… well, an office that’s been around for ages: Air Management Services! For whatever reason, we’ve heard a lot of chatter lately about AMS from contractors and developers. They pass harrowing tales of between themselves,…
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