Philadelphia Zoning Classifications Explained (RSA-5, CMX-2 & more)
What the district codes mean and how they control what you can build.
How does Philadelphia zoning classification work?
Philadelphia assigns every parcel a zoning district — a code like RSA-5 or CMX-2 — that controls what can be built there and how it can be used. The code sets the permitted uses, the size and height of buildings, setbacks, and density. Knowing a property's district is the first step in any development or purchase.
The main district families
- Residential (e.g., RSA, RM) — single-family and multi-family housing at varying densities;
- Commercial / mixed-use (e.g., CMX) — retail and mixed residential-commercial;
- Industrial (e.g., I) — manufacturing and heavier uses; and/or
- Special-purpose and overlay districts that layer extra rules on top.
Why the classification drives your project
If your plan fits the district, it may proceed by right; if it does not, you need a variance or other relief. Confirming the classification — and any overlay — before you buy or design avoids expensive surprises.
How Nochumson P.C. helps
Nochumson P.C. analyzes zoning classifications and maps the path to approval for developers and owners. Contact us to check what a property allows.
Related articles:
- Use Variance vs. Dimensional Variance in Philadelphia
- How to Get a Zoning Variance in Philadelphia
- By-Right vs. Variance Development in Philadelphia
- Zoning Overlay Districts in Philadelphia
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