Off-Grid Living in Guernsey County, Ohio

I'll be upfront: Guernsey County itself doesn't run a countywide zoning code. In Ohio, land-use zoning is a township-level power (under state law, ORC 519), so whether you can put a dwelling, cabin, or off-grid setup on raw land really depends on which township your parcel sits in. I couldn't find a single county ordinance that governs this, so my honest advice is to call the specific township trustees or zoning department before you buy or build.

Where the county does step in is subdivided land. The Guernsey County Planning Commission sets standards for streets and infrastructure on any newly platted subdivision in the unincorporated county, so if you're buying a lot that was recently subdivided, those standards apply regardless of township rules.

For dwellings: I found no county rule banning tiny homes or RVs as permanent residences, but I also found nothing confirming they're allowed as a primary dwelling either, that's a township zoning question. What is confirmed is that manufactured/mobile home installations need a permit in advance from the relevant authority, and the County Auditor and Treasurer must be notified after installation, per the county auditor's own manufactured home guidance.

Building permits and inspections for stick-built homes go through the Mid-East Ohio Building Department, a regional certified building department that covers Guernsey along with several neighboring counties, applying the statewide Residential Code of Ohio. Manufactured home installation and licensing specifically falls under the Ohio Department of Commerce's Manufactured Homes Program at the state level.

Septic, greywater, and wells are handled locally by the Cambridge-Guernsey County Health Department, which administers Ohio's statewide sewage and private water system rules (OAC 3701-29 and 3701-28). They run an operation-and-maintenance program for sewage treatment systems, including greywater recycling systems, with different rules depending on whether your system predates or postdates January 1, 2015. The same department issues permits for new wells, well conversions, alterations, and sealing, and cisterns appear to be treated as a category of private water system in their fee materials. Composting toilets aren't separately addressed in anything I found, so I'd call the health department directly if that's your plan.

Rainwater harvesting doesn't have a Guernsey-specific rule I could locate, but nothing suggests it's restricted beyond the general state private-water-system framework.

Finally, on going off-grid entirely, disconnected from electric, water, or sewer utilities, I found no county ordinance mandating hookups. Your dwelling still needs to meet the Residential Code of Ohio as enforced by Mid-East Ohio Building, but code compliance isn't the same as a utility mandate. If off-grid utility independence is central to your plan, confirm with both the township zoning office and the building department before committing.