What Does a Site Plan Need to Show for a Building Permit?
A site plan looks simple compared to a floor plan or a structural sheet, which is exactly why it gets underestimated — but it's frequently the very first thing a zoning reviewer checks, because it's what establishes that a project is even legally allowed on that lot before anyone reviews the construction itself.
What a site plan actually is
A site plan is a scaled drawing of the entire lot — not just the building — showing the property boundaries, existing conditions, and the proposed structure's location relative to everything around it. It's the civil/site discipline of a permit set, distinct from the architectural floor plan, which only shows what's inside the building's footprint.
The core elements every site plan needs
At minimum, a permit-ready site plan needs:
- Property lines with accurate dimensions, taken from the recorded legal boundary — not an estimate from satellite imagery
- North arrow and scale, matching the rest of the permit set
- Existing structures, driveways, and easements shown accurately
- Dimensioned setback distances from all property lines to the proposed structure
- Utility connection points and any drainage or grading changes the project introduces
Why it's checked first
Zoning review and building code review are typically separate processes, and zoning review — which starts with the site plan — establishes whether the proposed use and building envelope are even allowed on that parcel at all. An error here can hold up an entire submittal regardless of how well-drawn the rest of the set is, because there's little point reviewing construction details for a footprint that doesn't legally fit the lot.
The most common site plan mistake
The recurring issue isn't a misunderstanding of the setback rule itself — it's measuring from the wrong reference line, such as the edge of pavement instead of the recorded property boundary, or relying on outdated parcel data. Confirming the current legal boundary and zoning designation directly with the assessor or planning department before the site plan is finalized avoids this almost entirely — our free property lookup tool is a starting point for pulling those basics before you commit to final dimensions.
An aerial-view site plan drawing of a rectangular lot showing the property boundary, a north arrow, dashed setback lines on all four sides with dimension callouts, the existing house, and the proposed addition footprint shaded in — conveys the core elements a permit-ready site plan must include.
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