Zoning, Site Plans, and Property Use
Two different rulebooks
Zoning regulates the use of land; the building code regulates how a building is built. A building permit does not authorize a use that zoning prohibits, and zoning approval does not relieve the applicant of code compliance. Many jurisdictions require both approvals, and a certificate of occupancy often depends on zoning sign-off.
Zoning vocabulary to know
Districts (residential, commercial, industrial, mixed use, overlay), permitted versus conditional or special uses, and dimensional standards: minimum lot area and width, setbacks for front, side, and rear yards, height limits, lot coverage, and floor area ratio. Nonconforming uses and structures may continue but generally cannot be enlarged and cannot be re-established after abandonment. A variance addresses hardship and is granted by a zoning board; an administrative appeal challenges an interpretation.
Site plans
Site plan review covers parking and loading counts, access and circulation, stormwater and grading, landscaping and buffers, lighting, signs, and utilities. Floodplain is the frequent trap: development in a special flood hazard area typically requires a separate floodplain development permit and an elevation certificate, and the substantial improvement or damage threshold, commonly 50 percent of market value, determines whether an existing building must be brought into compliance.
Rule of thumb
Before issuing any permit for an existing building, ask two questions: is the use allowed here, and does the use change the occupancy classification? If either is unclear, route to zoning and plan review before taking fees. A change of use can trigger review even when no construction is proposed.