An expired permit means an authority once issued an approval, but the approval may no longer authorize work to continue. That differs from work that was never permitted. It also does not tell you whether a final inspection or occupancy record was completed. Check the permit number, approved scope, expiry date, inspection history, and any open enforcement case before choosing a route.
Atlanta’s route depends on the permit and project
Atlanta’s Office of Buildings page says an expired building permit is invalid and a new permit application and issuance are required to continue work. A separate City process may allow an extension for a permit expired less than 60 days, subject to a written request and an active-project verification inspection. The page does not explain how that extension interacts with its newer simplified renewal pathway, so ask the City which route fits the permit.
The simplified pathway, effective March 16, 2026, is limited to certain expired residential permits. The City’s version 2.2026 procedure lists conditions including an original permit issued within two years, unchanged ownership and approved plans, at least one qualifying building inspection, no open enforcement case, and no requested plan revisions. A new application and permit are still required. Construction-cost-based permit fees are charged again, although some prior review or Certificate of Occupancy fees may not be. The City estimates about three business days after it confirms eligibility and required fees are paid; this is not a guaranteed completion time. Requests must go directly through the Office of Buildings, not the ACA portal.
The City source concerns residential permits generally, not ADUs specifically. It does not establish that an existing unit qualifies, that work passed inspection, or that an expired permit can be used for a changed project.
When legalization is a different question
If no permit was ever issued for the work, an expired-permit renewal is not the right category of application. Ask the responsible authority about its retrospective permit or legalization path. If the permit was issued but the final inspection is missing, ask how to complete that approval and obtain the final record. See the regularization guide and completion-record guide. A recovered permit does not itself establish final compliance or current permission to occupy.