Do I need a permit for accessory dwelling unit (adu) in Unincorporated Putnam County?
Unincorporated Putnam County does not issue residential building permits. Putnam County has no Ohio Board of Building Standards certified residential building department (BBS jurisdiction map and certification list), so no county residential building permit is issued for 1-, 2- and 3-family homes in unincorporated areas. BBS shows no certified commercial department for the county either, so commercial plan approval falls to the state Division of Industrial Compliance. Township zoning permits (where a township has zoning), floodplain permits, and county health district septic and well permits may still apply. Some cities and villages in the county run their own departments.
The requirements below come from Ohio rules and describe the standard the work must still meet. They are not a statement that Unincorporated Putnam County will issue you a permit.
Most likely yes. Accessory dwelling unit (adu) usually requires a permit in Ohio. Confirm the specifics with Unincorporated Putnam County.
The Residential Code of Ohio covers one-, two-, and three-family dwellings, so a new accessory dwelling needs plan approval and inspections from the certified residential building department like any new dwelling. Converting existing space such as a garage or basement into a dwelling unit is a change of use under Section 113.7, and Section 1111.2 requires any space converted to a dwelling unit to meet the energy chapter. Each sleeping room needs an emergency escape and rescue opening under Section 310.1. Smoke alarms are required, and carbon monoxide alarms are required where the unit has a fuel-fired appliance or an attached garage (Sections 314 and 315). Whether an ADU is allowed on your lot is a local zoning question. Confirm it with your city, village, township, or county before you design.
Get your exact answer
Answer a few questions to see the specific permits, documents, and next steps for your accessory dwelling unit (adu) in Unincorporated Putnam County.
Check my projectDocuments you may need
- Building permit applicationRequired
- Site plan with setbacks, utilities, and all existing structuresRequired
- Construction drawings: floor plan, foundation, framing, egress windows, smoke and carbon monoxide alarmsRequired
- Energy code compliance documentationLikely required
- Local zoning approval for the second unitVerification needed
Possible inspections
- Footing and foundation inspection
- Framing plus electrical, plumbing, and mechanical rough-in
- Insulation inspection
- Final inspection and certificate of occupancy
Frequently asked questions
- Do I need a permit for accessory dwelling unit (adu) in Unincorporated Putnam County?
- Most likely yes. Accessory dwelling unit (adu) usually requires a permit in Ohio. Confirm the specifics with Unincorporated Putnam County. The documents and inspections sections on this page list what the building department typically asks for.
- Who issues the permit in Unincorporated Putnam County?
- The local building department for Unincorporated Putnam County handles permitting. This page lists its contact details and online portal. Your mailing city is not always the permitting authority, so confirm the jurisdiction before you apply.
- How do I find out the exact requirements for my project?
- Run the free PermitRoadmap check for your specific project and answers. It returns the likely permits, documents, inspections, and next steps, each linked to its official source.
PermitRoadmap is an independent informational service and is not affiliated with any city, county, state agency, or permitting authority. Results are informational and do not replace confirming requirements with the local permitting authority.