Arlington County is a single jurisdiction that operates as a county-manager form of government, meaning there are no independent incorporated cities or towns within its borders. All building permits, zoning, and inspections are managed centrally by the county government. The county utilizes specific overlays for Chesapeake Bay preservation, historic districts, and site plan requirements for high-density development.
How this fits with the state
The state authority here is Virginia DPOR - Board for Contractors. The county file does not replace that — it adds the permit office, local overlays, and the actual filing path.