Do I need a permit for plumbing fixture or repiping in Brookhaven?

Yes. In Georgia, plumbing fixture or repiping generally requires a permit, and Brookhaven 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. DeKalb County's own permitting office is the DeKalb County Planning and Sustainability, reachable on 404-371-2155 at https://dekalbcountyga.gov/departments/planning-and-sustainability/permits-plan-review-and-inspections. Its online permit portal is https://epermits.dekalbcountyga.gov/. 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. Brookhaven Code Sec. 7-118(d)(5) states that when concealed drain, water, soil, waste, or vent pipe must be removed and replaced with new material, the work is new work that needs a permit and inspection. Only like-for-like removal and replacement of sinks, lavatories, faucets, and toilets without relocating fixtures or piping is exempt.