Do I need a permit for plumbing fixture or repiping in Unincorporated Cobb County?

Yes. In Georgia, plumbing fixture or repiping generally requires a permit, and Unincorporated Cobb County is no exception.

Repiping or moving supply and drain lines requires a plumbing permit; a simple like-for-like fixture swap (for example a faucet) using existing connections is often exempt, but confirm locally. Concealed piping must be inspected before walls are closed, so schedule the rough inspection before covering the work. Cobb County's own permitting office is the Cobb County Development and Inspections, reachable on 770-528-1000 at https://www.cobbcounty.gov/community-development/building-development/permitting. Its online permit portal is https://cobbca.cobbcounty.gov/CitizenAccess/default.aspx. It issues permits for the unincorporated county. If your city does not run its own building department, and many smaller Georgia municipalities do not, this is the office that will handle the job. The rough inspection has to happen before walls are closed, so confirm scheduling lead time when you pull the permit. Water distribution lines are a line item on Cobb County's Subcontractor Permit Request, and the permit must be issued before any work begins. Cobb's required inspections do not allow insulation or sheetrock until all required rough inspections pass, so schedule the plumbing rough before walls are closed. A permit stays active only with a passing inspection at least every 60 days.