Permitting is highly decentralized, with the City of Rochester and 19 towns maintaining their own building departments and code enforcement. The county primarily handles planning reviews for projects affecting county roads or drainage, while local municipalities retain jurisdiction over residential and commercial building permits. Specific overlays for floodplains and agricultural districts are managed at the local level in coordination with county planning maps.
How this fits with the state
The state authority here is Local licensing authorities; NYC DCWP / DOB in New York City. The county file does not replace that — it adds the permit office, local overlays, and the actual filing path.