Glynn County adds ADU standards, sparks debate over attached units, occupancy and housing impacts

Planners proposed a new accessory dwelling unit (ADU) section in the draft zoning ordinance that would allow detached ADUs up to 1,000 square feet with a maximum of two bedrooms and two baths; ADUs must meet International Residential Code standards and cannot be manufactured homes.

Staff said the ADU definition is intended to be an accessory, detached unit; attached additions with kitchens are treated as additions to the primary dwelling in the draft. That distinction prompted lengthy commissioner discussion. Several members argued attached ADUs (garage conversions or attached apartment conversions) should be permitted and treated equivalently because restricting ADUs to detached units can create perverse outcomes: attached ADUs may be more practical, avoid duplicate flood insurance policies, and be easier for financing/appraisal to count rental income.

Commissioners also questioned how the county's maximum of five unrelated persons per single‑family lot interacts with ADUs; staff said the five‑unrelated limit still governs single‑family lots and that the draft did not intend to disallow families with many members but sought to distinguish ADUs from group homes.

Why it matters: ADUs are a tool to increase rental stock and provide flexible housing for caregivers, multigenerational households and workforce housing. The county's approach to attaching ADUs, occupancy limits and meter/addressing rules will affect affordability, insurance costs and whether ADU income can be counted by mortgage underwriters.

Next steps: staff said they will take commissioner feedback on attached vs. detached ADUs and the five‑unrelated‑persons rule back to the drafting team and consider clarifying metering and occupancy language in the next draft.