Building permits, zoning and septic rules across Ohio’s counties

Ohio has 15 of 88 counties without a residential building-permit requirement in unincorporated areas; the county counts concern land outside city limits, where municipal rules can differ¹. The highest-scoring counties in that group are Adams County, Monroe County, Morgan County, Perry County, Gallia County, Hocking County, Holmes County, Vinton County¹. Another 28 counties require a residential building permit only in some cases, and 45 require one².

Statewide, an owner submits plans to the municipal, township or county building department that has jurisdiction, but where no department certified for residential buildings has jurisdiction, the owner does not have to make that submission⁸. Counties may adopt and enforce local residential building regulations in unincorporated areas and may operate certified building departments¹⁰. Use the Ohio no-building-codes list to start a shortlist, then ask the Ohio Board of Building Standards which department is certified for the address^1,11.

Where a certified building department has jurisdiction, an owner-builder submits plans before construction and may not start until they are approved; residential plans need no architect or engineer seal⁸. Approval becomes invalid if construction has not started within 12 months, and one 12-month extension is available for a fee of no more than $100⁸. Inspections follow plan approval, at times the building official and owner agree on¹².

Each certified department charges under its own locally adopted fee schedule, so ask the department for the address¹³. Where plans go to the state Division of Industrial Compliance instead, the schedule includes a $275 processing fee for structural, mechanical, electrical, fire alarm and sprinkler scopes and a $65 certificate of occupancy or completion¹³.

Building your own home does not exempt every trade. Ohio’s contractor-licensing definitions exclude a residential building from the defined construction project, but that is not a universal owner-builder exemption, and counties may license electrical and HVAC contractors by resolution^14,15.

Ohio has 39 counties without countywide zoning and 42 with county zoning^2,3. The highest-scoring counties without countywide zoning are Adams County, Morgan County, Perry County, Gallia County, Hocking County, Holmes County, Noble County, Vinton County³. Ohio has 13 counties with neither a residential building-permit requirement nor countywide zoning⁶.

Use the no-countywide-zoning list and no-building-permit and no-countywide-zoning list as starting points, not as permission for a particular land use^3,6. County zoning authority covers unincorporated territory only, so cities and villages set their own rules, and the county may regulate height, lot coverage and yards for nonresidential property only¹⁶. Township zoning resolutions are a separate layer: they can regulate setbacks and height for agricultural buildings on lots over 1 acre and up to 5 acres in qualifying platted subdivisions, and the statute sets no statewide distance or height⁴. Ask the township zoning office and the municipal planning office about RV occupancy, tiny-home placement and setbacks before buying.

Ohio’s local boards of health approve, permit, inspect and enforce sewage-treatment-system requirements; the Ohio Department of Health supplies statewide rules and technical guidance⁵. Across Ohio, 75 counties have a county septic authority and 13 are served by a multi-county health district².

A new, replacement or altered septic system needs a site review first, with the application and fee, a soil evaluation and a system design; the soil evaluation can be waived for small lots, alterations or incremental repairs⁷. An installation or alteration permit is valid for 1 year, a site review stays valid for 5 years if site conditions and the design do not change, and a separate operation permit is required for up to 10 years⁷. The board of health inspects the installation and again within 12 months of approval⁷.

Check sewer access before designing a system: connection to a public or regional sanitary sewer is required when it is accessible and available, with a 300-foot threshold for an existing structure or a single proposed structure¹⁷. State program questions go to the Sewage Treatment Systems Program; local health districts handle permitting and can adopt stricter standards¹⁸.

Only 4 Ohio counties have a reviewed RV answer: Clark County allows RV occupancy as temporary emergency housing only, Carroll County and Hamilton County limit it, and Franklin County prohibits it; the other 84 have no county-level answer yet². Tiny homes have an answer in 2 counties, Clinton County and Clark County, and both are limited; 86 are unanswered². We could not confirm a statewide tiny-home rule, so the parcel’s zoning office and certified building department decide¹⁹.

Statewide rules cover other situations. Ohio’s licensed-campground rules govern RVs on licensed campground sites, not living on a private residential parcel²⁰. Camping in state forests is prohibited outside designated areas, sites or campgrounds²¹. Roadside camping is limited to designated forests along division-maintained roads during legally established hunting seasons²². A manufactured home generally may not be occupied until the inspector issues the inspection seal, a temporary occupancy permit may be the exception, and local ordinances can still govern placement²³.

The highest Bolthole Index scores belong to Adams County, Monroe County, Morgan County, Perry County, Gallia County, Hocking County, Holmes County, Noble County². Adams County scores 74, Monroe County 73, Morgan County 71 and Perry County 70; Gallia, Hocking, Holmes and Noble counties each score 69².

Those counties all have county septic authorities; Noble County’s residential building-permit answer is limited, while the others require no residential building permit². All of that group except Monroe County have no countywide zoning; Monroe County’s zoning answer is unconfirmed².

Ohio’s median county farmland value is $8,006 per acre; Lawrence County has the lowest listed value at $3,357 per acre². These farmland values are context for comparison, not a vacant-parcel asking price². The median county effective property-tax rate is 1.1%, and the median county property-tax bill is $1,856 annually; neither median is a quote for a particular parcel².

Ohio requires a board-of-health permit for construction, alteration or sealing of a private water system, including a well, with an exception that lets a person sealing or decommissioning a system that is not being replaced apply afterward⁹. Applications include fees and required information, with water-sampling fees for alteration, conversion or new construction⁹. Contact the local health district for the parcel before hiring a well contractor; the Ohio Department of Health’s Private Water Systems Program provides technical guidance and contractor registration^9,24.

Ohio’s water-use framework describes domestic use as exempt from withdrawal registration, which applies above 100,000 gallons per day; that exemption does not remove the private-water-system construction permit^9,25.

Ohio’s subdivision rules apply when a division creates any parcel under 5 acres; a division into parcels of more than 5 acres is exempt when it involves no new streets or easements of access²⁶. A plat of land outside a municipal corporation generally needs county commissioner approval before it can be recorded²⁶. A parcel used only for agricultural or personal recreational purposes can be exempt from the local approval rules where the planning authority has adopted them, but the planning authority must first review a later change of use²⁷.

Farm buildings follow a separate path. Buildings incident to agricultural use of the land are excluded from the state building-code provisions when not used in retail trade, and a building still counts as non-retail if 50 percent or more of its sales income comes from products raised on the seller’s farms²⁸. A county or township zoning inspector’s certificate declaring a specific building to be used in agriculture independently excludes it²⁹.