ADU Permits: Columbus vs Dublin
How do adu permits rules compare between Columbus, OH and Dublin, OH?
Columbus, OH
Franklin County
Columbus permits ADUs by-right in all residential and apartment residential zoning districts under the Title 33 ADU Pilot Program ordinance effective December 24, 2025. Permits are issued by the Department of Building and Zoning Services under the Ohio Building Code and the Residential Code of Ohio. ADUs may not exceed 65% of the principal building's floor area or 1,000 sq ft (whichever is greater) and may not exceed the principal building's height or 25 ft.
View full Columbus rules →Dublin, OH
Franklin County
No data available yet for Dublin.
Key Facts Comparison
| Fact | Columbus | Dublin |
|---|---|---|
| Authority | Title 33 ADU Pilot (eff. 12/24/2025) | - |
| Size Cap | 65% or 1,000 sq ft, greater | - |
| Height | Principal or 25 ft, lesser | - |
| Parking | None required | - |
Highlighted rows indicate differences between cities.
Columbus FAQ
Where do I apply for an ADU permit in Columbus?
Columbus Department of Building and Zoning Services online portal handles both zoning and building permit review. Plans must show setbacks, lot coverage, ADU floor area, and elevations.
Is an ADU by-right in Columbus now?
Yes - effective December 24, 2025, ADUs are permitted by right in all R and AR zoning districts. Historic overlay districts still require Certificate of Appropriateness.
Dublin FAQ
No FAQs available.
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