Washington County, OH Building Permits, Zoning & Septic Rules

Washington County, Ohio requires residential building permits for covered work through the Southeast Ohio Building Department¹². Washington County appears to have no countywide zoning, while the official zoning page directs buyers to the township, city or village governing the parcel³⁴. Septic systems go through the Washington County Health Department⁵.

At a glance

Building permit: Required for covered work through the Southeast Ohio Building Department¹²
Zoning: Appears to have no countywide zoning; ask the township, city or village governing the parcel³⁴
Septic permit: Required through the Washington County Health Department⁵⁶
Owner-builder exemption: Not confirmed; ask the Southeast Ohio Building Department⁷
Agricultural building: Conditional exemption requires a qualifying zoning certificate⁸
Manufactured home: Occupancy requires a state inspection seal⁹
Private well: Board-of-health permit required before drilling¹⁰
Property tax: About 1.0% effective rate; median bill about $1,665 per year¹¹¹²

Who to call

Building permits

Southeast Ohio Building Department (Washington County)

Building plan review, permits and inspections for Washington County

740-374-4185

340 Muskingum Drive, Marietta, OH 45750

Health department

Washington County Health Department (Environmental Health / Sewage Program)

Permits and inspects qualifying residential and commercial sewage treatment systems in Washington County

740-374-2782

[email protected]

340 Muskingum Drive, Suite B, Marietta, OH 45750

Planning & zoning

Washington County Planning Commission

Subdivision approval and rights-of-way for access across private property

740-373-6623

223 Putnam Street, Marietta, OH 45750

Contact details are copied from each office’s official page and were checked against it on September 28, 2026.

Do you need a building permit in Washington County, Ohio?

Washington County, Ohio requires a residential permit for covered construction before work starts¹². The county's residential list says permits are always required for additions, garages or carports, basements, structural alterations and accessory buildings over 200 square feet, among other listed work². Accessory buildings of 200 square feet or less and listed ordinary repairs do not need a permit, but they still must meet code requirements². Ohio law bars an owner from proceeding with covered construction until the plans and supporting documents have been approved¹³. Plan approval becomes invalid if work has not started within 12 months, subject to the stated extension process¹⁴.

Who handles permits in Washington County, and how do you reach them?

Washington County routes building, sewage and subdivision questions to separate offices¹⁵¹⁶¹⁷. The Southeast Ohio Building Department is at 340 Muskingum Drive, Marietta, OH 45750, phone 740-374-4185, and accepts electronic drawings through Dropbox¹⁵. The Washington County Health Department is at 340 Muskingum Drive, Suite B, Marietta, OH 45750, phone 740-374-2782, email [email protected]¹⁶. The Washington County Planning Commission is at 223 Putnam Street, Marietta, OH 45750, phone 740-373-6623, and handles subdivisions and rights-of-way for access across private property¹⁷.

Does Washington County have zoning?

Washington County appears to have no countywide zoning, although the county's official zoning page does not expressly say so³. Washington County's official zoning page says the City of Marietta Engineering Department regulates zoning inside Marietta; outside Marietta, buyers should contact the trustees of the township where the property lies, or the relevant city or village for property inside another municipality⁴. Ohio law allows county commissioners to adopt zoning for unincorporated territory, but that general authority does not establish a parcel's current rules¹⁸. Ask the governing township, city or village about setbacks, minimum home size, lot coverage, building height and allowed uses before designing a project⁴.

How do septic permits work in Washington County, Ohio?

The Washington County Health Department permits and inspects residential sewage systems and commercial systems with flows of 1,000 gallons per day or less⁶. Ohio law requires a site review, including a soil evaluation and system design, before the installation permit issues¹⁹. The health department performs a post-installation inspection within 12 months, and a separate operation permit may run for up to 10 years²⁰¹⁹. Only about 1.1% of Washington County soils are rated without severe limits for a conventional septic drain field, so a buyer should obtain the site and soil evaluation before assuming a conventional system will work²¹¹⁹.

Can you live in an RV or tiny home on your land in Washington County?

Washington County's reviewed sources do not confirm a general rule allowing long-term RV living or tiny-home occupancy on private land³. The applicable zoning authority is the township, city or village governing the parcel, so ask that office about the proposed structure and residential use before buying or building⁴. A manufactured home cannot legally be occupied in Ohio until a state inspector issues the inspection seal⁹. Ohio's campground rules apply to licensed campgrounds and do not answer whether you may live in an RV on your own parcel²². For land in Marietta, contact the City Engineering Department; elsewhere, contact the relevant township trustees, city or village⁴.

Building a home in Washington County: the steps, in order

Identify the township, city or village governing the parcel and ask that authority about zoning before designing the home⁴.
Submit plans to the Southeast Ohio Building Department; electronic drawings are accepted through Dropbox, and covered work cannot begin before approval¹⁵¹⁴.
Budget for the published residential fee schedule, including a $125 structural processing fee plus $10 per 100 square feet²³.
Start the sewage site review and installation-permit process with the Washington County Health Department⁶¹⁹.
If dividing land into a lot smaller than 5 acres, take the plat through the Planning Commission before recording it¹⁷²⁴.
Apply to the board of health before drilling a private well¹⁰.
Schedule the inspections listed with the plan approval; the required list depends on project scope²⁵.

What to check before you buy land in Washington County, Ohio

Washington County averages about 44.1 inches of annual precipitation, while severe drought occurred in about 2.2% of measured years²⁶²⁷. Only about 1.1% of county soils are rated without severe limits for a conventional septic drain field, so obtain a site and soil evaluation before treating a conventional system as feasible²¹¹⁹. About 43.6% of Washington County land has a slope of 15% or less, and about 69.9% is wooded, making access, clearing and grading parcel-specific cost questions²⁸²⁹. Confirm the governing township or municipality and its zoning rules before closing⁴. Washington County's effective property-tax rate is about 1.0%, its median annual bill is about $1,665, and farmland value is about $4,671 per acre¹¹¹²³⁰.

Watch-outs

Washington County appears to have no countywide zoning, but the county's official page directs each parcel to its township, city or village for the rules that apply³⁴.
A manufactured home cannot be legally occupied in Ohio until the state inspector issues the inspection seal⁹.
No official statement confirms an owner-builder exemption from Washington County's building-permit process; ask the Southeast Ohio Building Department before starting work⁷¹⁵.
An agricultural building exemption is conditional on a county or township zoning inspector issuing a certificate declaring the specific structure will be used in agriculture⁸.

Sources

Written September 28, 2026 from the rules quoted below, each taken from an official source and re-checked by an independent reviewer. This is research, not legal advice: rules change, so confirm with the office before you buy or build.

How Washington County scores

Seclusion54100% ev.

Self-Sufficiency60100% ev.

Admin Boringness5590% ev.

Durability76100% ev.

Property Autonomy35100% ev.

Carry Cost80100% ev.

Evidence strength: 98%. This reports direct-source completeness and fallback use; it is separate from the score and is not a confidence interval. How it works →

$191kTypical home

1%Property tax

$4,671Land / acre

44.1"Annual rain

2.2% of yrsSevere drought

3.7 / yr (+3.6)Mid-century 100°F days

11.6 daysMid-century dry spell

1.7" (+7.8%)Mid-century 1-day rain

1.9×Wildfire change factor

100%Forward climate coverage

$1,174Home insurance / yr

-0.2% / yrInsurance growth

1.46%Nonrenewal rate

county median (2+ published ZIPs)Insurance basis

38,692People within 30 min

1,945,763People within 2 hr

66,146Radius comparison (15 mi)

92.7People / sq mi

9.7%Federal land

43.6%Land at 15% slope or less

1.1%Septic soil without severe limits

4,474 acWorkable land screen

69.9%Wooded land

55.3 tonsBiomass / forest ac

53.4°FAvg temp

Answers from the rulebook for Washington County

What the ordinances and state agencies actually say — one answer per question, each quoted from the official source and independently re-checked.

Washington County rules

Building permitRequired
Residential and other listed projects in Washington County within the Southeast Ohio Building Department jurisdiction
- Residential projects covered by the guide are one-family and two-family dwellings and townhouses; apartment buildings, condominiums, and similar buildings are commercial projects.
- A permit is always required for the listed work, including additions, garages or carports, basements, accessory buildings over 200 square feet, qualifying pools, structural alterations, certain appliances and electrical work, and reroofing or siding repairs of 400 square feet or more.
- Residential accessory buildings of 200 square feet or less and other listed ordinary repairs do not require permits, but must meet code requirements.
- Floodplain development is listed for the City of Marietta and unincorporated areas of Washington County.
accessory building permit threshold: > 200 square feet (Accessory buildings of 200 square feet or less are listed as not requiring a permit.) · fence permit threshold: > 6 feet (Swimming-pool barriers/fences are included regardless of this threshold.) · retaining wall threshold: > 2 feet (Any height is included when supporting a surge from a structure above.) · pool threshold: more than 2 feet of water, more than 150 square feet, and more than 5,000 gallons · reroofing or siding threshold: >= 400 square feet
“A permit is always required for any of the following work:”
Permits ↗Re-checked Sep 26, 2026
Building code adoptedAdopted
Residential and commercial construction within the Southeast Ohio Building Department jurisdiction serving Washington County
- The listed residential code is for one-, two-, and three-family dwellings.
- The current-code PDF states it was updated 2024-05-06; that update date is not treated as an effective date.
“Residential Codes 2019 RCO Residential Code of Ohio for 1, 2 and 3 Family Dwellings”
Building Department ↗Re-checked Sep 26, 2026
InspectionsRequired
Projects receiving plan approval under the Residential Code of Ohio in the Southeast Ohio Building Department jurisdiction
- The inspection list is provided when plan approval is issued.
- Inspections may be performed in part or in whole.
- The list may be abbreviated when given with the Certificate of Plan Approval.
- Required inspections include lot-line marking, footing excavation and underground utilities, foundation, slab and under-floor, lowest-floor elevation where applicable, frame, lath/gypsum board, fire-resistive assemblies, energy/envelope, building-services equipment, and other inspections required by the building official based on project scope.
“A list of inspection(s) shall be provided at the time the plan approval is issued per RCO 108.2. The list indicates which inspections are required for the project and the items an inspector should be verifying at a minimum to ensure work constructed is in compliance with the Approved construction documents.”
Required Inspections Check List and Guide for Inspector ↗Re-checked Sep 26, 2026
Local zoningVaries (with conditions)
Zoning across Washington County, aggregated across the City of Marietta, other cities and villages, and townships
- The City of Marietta Engineering Department regulates Marietta zoning ordinances.
- Outside Marietta, contact the township trustees of the township where the property is located.
- Properties located in a city or village require contacting that city or village for zoning information.
“The City of Marietta, Engineering Department is responsible for regulating the City of Marietta Zoning Ordinances. If your property is located outside the City of Marietta, you should contact the township trustees of the township in which your property is located. If you are located in a City or Village, you must contact that city or village for zoning information.”
Zoning Information ↗Re-checked Sep 26, 2026
Who permits septicCounty
Residential and commercial sewage treatment systems with flow of 1,000 gallons per day or less within Washington County
- The Washington County Health Department administers the county sewage program.
- Commercial systems above 1,000 gallons per day are outside the scope stated on the page.
maximum stated flow: <= 1000 gallons per day
“We permit and inspect the installation of residential and commercial (1000 gallons a day or less flow) sewage treatment systems within Washington County.”
Sewage Program ↗Re-checked Sep 26, 2026
Driveway accessLimited
Rights-of-way for access across private property in Washington County subdivisions
- The Planning Commission responsibility is stated for subdivisions and rights-of-way for access across private property; the source does not establish a universal driveway permit for every parcel or project.
“The Planning Commission is responsible for the approval of all subdivisions in Washington County, and any right-of-way for access across private property.”
Planning Commission ↗Re-checked Sep 26, 2026
Permit processPartial
Building permit and plan-approval process for Washington County projects handled by the Southeast Ohio Building Department
- The department accepts electronic drawings through Dropbox.
- Applications may fail to continue to the certificate-of-occupancy process or may not be approved because of compliance issues, plan changes, zoning, or floodplain issues.
- Application fees are non-refundable.
“We accept electronic drawings via Dropbox”
Building Department ↗Re-checked Sep 26, 2026
County-wide zoningAbsent
Washington County has no countywide zoning resolution; the county Planning Commission administers only subdivision regulations, and zoning where it exists is adopted at the township level.
Washington County - Planning Commission ↗Scouted from the county site, not yet independently re-checked

Ohio rules that apply here

Manufactured homesLimited
Occupancy of manufactured homes installed in Ohio and regulated under Chapter 4781 of the Revised Code and implementing rules.
- A manufactured home generally may not be occupied until the inspector issues the inspection seal.
- The inspection seal must be paid for when the permit is issued.
- A temporary occupancy permit may provide the applicable exception under Rule 4781-7-01(C).
- The home must meet Ohio manufactured-home installation standards; local ordinances and other regulations may also apply to site placement.
“Except as provided in paragraph (C) of this rule, no manufactured home shall be occupied until the inspector has issued the inspection seal.”
Chapter 4781-7 | Manufactured home inspections ↗Re-checked Sep 12, 2026
Septic permitRequired
Installation of a new or replacement sewage treatment system or alteration of an existing sewage treatment system in Ohio.
- A board of health must require a site review before accepting the permit application.
- The site review includes the application and fee, a soil evaluation, and an STS design; the soil-evaluation requirement may be waived based on small lot size, an alteration, or an incremental repair plan.
- The permit includes the completed application and fee, an approved site review, and proof of Ohio EPA Class V injection-well registration if applicable.
- An approved installation or alteration permit is valid for one year and may be extended by the board of health for an additional six months.
- A separate approved and valid operation permit is required to operate an STS or a type 2, 3, or 4 gray-water recycling system; its expiration may not exceed ten years.
site review validity: 5 years (Provided there are no changes to site conditions or STS design, including the sewage source.) · installation or alteration permit validity: 1 year (Board of health may extend the permit for an additional six months.) · operation permit maximum validity: <= 10 years (Frequency is determined by the board of health.)
“without an installation or alteration permit issued by the board of health.”
Rule 3701-29-09 | Site review and permits for STS installation and operation ↗Re-checked Sep 12, 2026
Septic inspectionRequired
New, replacement, or altered sewage treatment systems and their post-installation operation in Ohio.
- The board of health must inspect the installation in a timely manner; additional inspections may be required by the permit, product approval, or chapter.
- The board of health must inspect the completed system again no later than twelve months after installation approval and assess whether it is operating properly and not causing a public health nuisance or safety hazard.
- A board of health may conduct additional compliance inspections upon a good-faith complaint, probable cause, missing proof of required maintenance, or probable threat to public health.
- Required operation and maintenance may be demonstrated by a service contract or certified maintenance instead of a board inspection when otherwise allowed.
post-approval inspection deadline: <= 12 months · certification to director after post-approval inspection: <= 60 days
“The board of health shall inspect the completed system again not later than twelve months”
Rule 3701-29-09 | Site review and permits for STS installation and operation ↗Re-checked Sep 12, 2026
Well permitRequired
Construction, alteration, sealing, or decommissioning of private water systems, including private wells and test wells, in Ohio.
- A valid permit must be issued by the board of health before construction, alteration, or sealing, except that a person sealing a well or decommissioning a private water system not being replaced must apply no later than five business days afterward.
- Except where specified exceptions apply, no work may begin until the permit is issued and approved.
- Applications require the applicable permit fee, required information, and a fee for at least one water sample for alteration, conversion, or new construction.
- An application becomes a permit upon validation by the local health district.
- Plans are additionally required for specified systems, including systems serving a building, non-one/two/three-family dwellings, cisterns, springs or ponds, flowing-well areas, drive-point wells, buried pressure tanks, gasoline-powered pumps, continuous disinfection or filtration, and certain point-of-entry treatment systems.
post-sealing/decommissioning application deadline: <= 5 business days (Applies when the well or private water system is not being sealed or decommissioned because it is being replaced.)
“No person shall construct, alter or seal a private water system, test well or part thereof, unless a valid permit for the system has been issued”
Chapter 3701-28 | Private water systems ↗Re-checked Sep 12, 2026
Mandatory utility hookupSewer (with conditions)
Disposal of sewage where an existing publicly owned or regional sanitary sewer is accessible and available.
- The sewer connection may not conflict with an areawide waste-treatment plan, approved regional sewage-service and treatment plan, or connection ban.
- The receiving disposal system must have or be expected to have capacity to collect and treat the sewage.
- For an existing structure, any part of the structure generating waste must be within 300 feet of the nearest sanitary-sewer right-of-way boundary.
- For a proposed structure outside a larger common plan, any lot property line must be within 300 feet.
- For two or more proposed structures, the threshold is 200 feet multiplied by the number of proposed structures, up to 5,000 feet.
- The director may grant an exemption when technical, financial, environmental, legal, or physical barriers prevent connection and the alternative will not adversely affect human health or the environment.
- When a sewer later becomes accessible and available, a non-public or non-regional disposal system must generally be abandoned and connection made within three years unless the director authorizes another timeframe.
existing structure sewer-distance threshold: <= 300 feet (Measured to the nearest boundary of the sanitary-sewer right-of-way.) · proposed structure sewer-distance threshold: <= 300 feet (Measured from any property line of the lot.) · multiple proposed structures threshold: 200 feet multiplied by the number of proposed structures (Maximum distance is 5,000 feet.) · connection deadline after accessibility becomes available: 3 years (Unless an alternative timeframe is authorized by the director.)
“Connection into existing publicly owned or regional sanitary sewers is required for the disposal of sewage when said sewers are accessible and available.”
Rule 3745-42-07 | Best available technology for connection into sanitary sewers and centralized collection and treatment ↗Re-checked Sep 12, 2026
Agricultural exemptionConditional
Buildings or structures incident to agricultural use of the land, and a specific building or structure declared by a county or township zoning inspector to be used in agriculture.
- The exemption in section 3781.06 applies to buildings or structures incident to agricultural use of the land.
- The buildings or structures must not be used in the business of retail trade.
- A building or structure is not considered used in the business of retail trade if fifty per cent or more of gross income from sales of products in the building or structure comes from products produced or raised in a normal crop year on farms owned or operated by the seller.
- Under section 3781.061, a county zoning inspector under section 303.16 or township zoning inspector under section 519.16 must issue a zoning certificate declaring the specific building or structure is to be used in agriculture for the additional exemption described there.
- The cited section 3781.06 is effective January 1, 2025; section 3781.061 is effective October 17, 2019.
retail-sales agricultural-product threshold: >= 50 percent of gross income (Products must be produced or raised in a normal crop year on farms owned or operated by the seller.)
“issues a zoning certificate that declares a specific building or structure is to be used in agriculture, such building is not subject to sections”
Section 3781.06 | Public buildings to be safe and sanitary - definitions ↗Re-checked Sep 12, 2026
One more reviewed finding on this topic
- Conditional — Agricultural buildings or structures in Ohio, including Washington County
  “Whenever a county zoning inspector under section 303.16 of the Revised Code, or a township zoning inspector under section 519.16 of the Revised Code, issues a zoning certificate that declares a specific building or structure is to be used in agriculture, such building is not subject to sections 3781.06 to 3781.20, 3781.40, or 3791.04 of the Revised Code.”
  Section 3781.061 | Exemption for building or structure used in agriculture ↗Re-checked Sep 26, 2026
Subdividing landRegulated (with conditions)
Subdivision and platting of land in Ohio, including divisions of parcels and plats outside municipal corporations.
- A subdivision includes division of a parcel into two or more parcels, sites, or lots when any one is less than five acres for immediate or future transfer of ownership.
- A division or partition into parcels of more than five acres is exempt when it does not involve new streets or easements of access.
- A sale or exchange between adjoining lot owners is exempt when it does not create additional building sites.
- A planning authority may adopt a rule under section 711.133 exempting parcels of four acres or more within the size range delineated in that rule.
- Improvement of land involving division or allocation for opening, widening, or extension of public or private streets, or for common open spaces or utility easements, is also included in the statutory subdivision definition.
- No plat certifying lands outside a municipal corporation may be recorded without approval by the board of county commissioners, except where approval is required from a planning commission under sections 711.09 or 711.10.
- The cited section 711.001 states an effective date of July 1, 2010; the cited section 711.041 states an effective date of October 6, 1955.
subdivision parcel threshold: < 5 acres (The statutory definition applies when any resulting parcel, site, or lot is less than five acres.) · exempt parcel size: > 5 acres (Division or partition into parcels of more than five acres is exempt if no new streets or easements of access are involved.) · possible planning-authority exemption threshold: >= 4 acres (Only if the planning authority adopts a rule under section 711.133 and only within the size range delineated in that rule.)
“No plat certifying lands outside a municipal corporation may be recorded without the approval thereon of the board of county commissioners”
Section 711.001 | Plat definitions ↗Re-checked Sep 12, 2026
Permit feesPublished (with conditions)
Construction documents and inspections required to be submitted to the Ohio Division of Industrial Compliance.
- The certificate of occupancy or certificate of completion will not be issued until applicable fees are paid.
- The schedule includes a $275 processing fee for structural, mechanical, electrical, fire alarm, and sprinkler scopes; plan-examination fees vary by scope and area or device count.
- One initial plan review and up to two resubmission plan reviews are included; additional resubmissions cost $100 each.
- Additional inspections cost $150 per inspection; reinspections cost $150.
- Certificates of occupancy or completion cost $65, except existing-building certificates issued under rule 111.4 have no fee.
- The rule was effective January 1, 2019 and was last updated July 14, 2026.
structural processing fee: 275 USD · certificate of occupancy or completion fee: 65 USD (No fee for existing-building certificates issued under rule 111.4)
“The fees for examination and processing of construction documents when required to be submitted to the division of industrial compliance, except medical gas piping systems and temporary structures, shall be in accordance with Table B1.”
Chapter 4101:7-7 | Fees ↗Re-checked Sep 12, 2026
One more reviewed finding on this topic
- Variable (with conditions) — Construction-document submissions and inspections handled by certified municipal, township, or county building departments in Ohio.
  “Fees for construction documents submitted to and inspections made by certified building departments shall be in accordance with the locally adopted fee schedule.”
  Chapter 4101:7-7 | Fees ↗Re-checked Sep 12, 2026
Campground & park staysLimited
Occupancy and placement of recreational vehicles in Ohio-licensed campgrounds and temporary campgrounds.
- Recreational vehicles may be parked only on sites verified as complying with plans approved by the director, or, for a temporary campground, by the licensor.
- A campground site may contain no more than one recreational vehicle and two portable camping units, or three portable camping units.
- Sites generally must be at least 1,000 square feet, subject to the temporary-campground density exception determined by the licensor where open fires are prohibited.
- Separation, sanitation, sewage, gray-water, and licensed-capacity requirements also apply.
minimum campground site area: >= 1000 square feet (Except as provided in paragraph (I)(11) for temporary campgrounds.) · recreational vehicles per site: 1 vehicle (A site may also contain two portable camping units; alternatively, a site may contain three portable camping units.)
“Recreational vehicles or portable camping units shall be parked only on sites that have been verified as complying with plans approved by the director, or in the case of a temporary campground, by the licensor;”
Rule 3701-26-04 | Campground requirements ↗Re-checked Sep 12, 2026
2 more reviewed findings on this topic
- Prohibited — Camping in Ohio state forests outside areas, sites, or campgrounds designated by the chief of the division of forestry or an authorized agent.
  “No person shall camp in a state forest except in areas, sites or campgrounds designated by the chief of the division of forestry or authorized agent.”
  Rule 1501:3-3-01 | Camping permitted in designated areas ↗Re-checked Sep 12, 2026
- Limited — Roadside camping at designated Ohio state forests along public roads maintained by the division of forestry.
  “Roadside camping is permitted at designated state forests, along public roads maintained by the division of forestry, during certain legally established hunting seasons as authorized by the chief of the division of forestry.”
  Rule 1501:3-3-06 | Camp occupancy ↗Re-checked Sep 12, 2026
county zoning authorityGeneral
County commissioners may adopt zoning resolutions regulating building, structures, land uses, and districts or zones in unincorporated territory statewide.
- The authority is exercised by resolution and must be in accordance with a comprehensive plan.
- The authority applies to unincorporated territory of the county.
- The statute begins with the exception phrase “Except as otherwise provided in this section,” so the limitations in ORC Chapter 303 apply.
- For nonresidential property only, the county may regulate height, bulk, number of stories, size, lot coverage, yards, courts, open spaces, and population density.
- Agricultural uses and agricultural buildings are subject to the limitations in ORC 303.21; the statute also contains limitations for public utilities, railroads, telecommunications towers, alcoholic-beverage sales, oil and gas drilling, and permanently sited manufactured homes.
- Activities regulated under ORC Chapters 1513 and 1514 may be regulated only in the interest of public health or safety, and Chapter 1514 activities must be provided for as permitted or conditional uses as specified by ORC 303.02.
“the board of county commissioners may regulate by resolution, in accordance with a comprehensive plan”
Section 303.02 | County commissioners may regulate building and land use in unincorporated territory ↗Re-checked Sep 21, 2026
county building authorityGeneral
County commissioners may adopt and enforce local residential building regulations in unincorporated areas and may operate certified county building departments that enforce state residential and nonresidential building codes, accept and approve plans, and conduct inspections.
- Local residential building regulations may be enforced within the unincorporated area or within districts established in the unincorporated area.
- A local residential building regulation may not differ from the state residential building code unless it addresses subject matter not addressed by that code or is adopted under ORC 3781.01.
- An existing structures code must concern subject matter not addressed by, and may not conflict with, the state residential building code.
- County building departments may enforce state codes only for the types of buildings and subject matters for which they are certified.
- Certification permits enforcement authority, plan approval, and inspections; the certification application identifies whether it covers residential or nonresidential buildings and whether residential certification covers new construction only or also repair and alteration.
- The board may adopt flood-hazard, Lake Erie coastal-erosion, and drainage regulations, subject to the statutory limits and exceptions in ORC 307.37.
- Local regulations, codes, or amendments require public hearings at not fewer than two regular or special board sessions; they take effect on the thirty-first day after adoption.
- Regulations adopted under ORC 307.37 generally do not affect buildings or structures existing, or under construction, before adoption, except as provided for an existing structures code.
- The state residential building code is effective as a uniform requirement in areas with a building department certified to enforce it.
“The board of county commissioners may adopt local residential building regulations governing residential buildings as defined in section 3781.06 of the Revised Code”
Section 307.37 | Adoption of county building code ↗Re-checked Sep 21, 2026

Inside cities and towns in Washington County

Municipal rules found while researching the county. They apply inside that city or town, not to unincorporated land.

Permit feesPublished
Residential building-plan approval fees published by the Southeast Ohio Building Department for projects within its service jurisdictions.
- The cited residential application is dated 4/13/2021; the page does not state that date as an effective date.
- Lineal and square-footage figures are rounded up to the next 100 square or lineal feet.
- Fees include a 1% State of Ohio surcharge.
- Other permits may be required in incorporated cities, villages, and counties.
- Up-front fees are not refundable except for Washington County clerical error.
structural processing fee: 125 USD · structural fee: per 10 USD per 100 square feet · mechanical processing fee: 125 USD · mechanical fee: per 10 USD per 100 square feet · electrical/service entrance processing fee: 125 USD · electrical/service entrance fee: per 10 USD per 100 square feet · fire suppression processing fee: 100 USD · fire detection and alarms processing fee: 100 USD · re-roofing fee: 50 USD for 400 square feet or more · siding fee: 50 USD for 400 square feet or more · decks processing fee: 50 USD · decks fee: per 10 USD per 100 square feet · field inspection: 50 USD (Structural/Mechanical/Electrical) · resubmittal fee: per 75 USD per resubmittal · preliminary review: per 75 USD per submittal · permit renewal: 25 USD (One time renewal) · non-compliance fee: 2X permit fee · state surcharge: 1 percent (State of Ohio surcharge)
“F E E S C H E D U L E STRUCTURAL $125.00 Processing Fee $10.00 per 100 Square Feet”
Application for Residential Building Plan Approval ↗Re-checked Sep 23, 2026

Still unanswered

We looked and could not find an official answer yet. Silence is not permission — ask the county directly.

Owner-builder exemption — Owner-builder exemption from building-code approval or inspection requirements
Certificate of occupancy — Certificate of occupancy requirements for Washington County projects
Zoning districts — Published zoning districts for Washington County
Minimum dwelling size — Minimum dwelling size requirements in Washington County
Setbacks — Setback requirements in Washington County

8 more unanswered

Lot coverage
Building height
Living in an RV
Camping on your land
Tiny homes
Accessory dwellings
Off-grid sanitation
Short-term rentals

Each answer was extracted from an official source and independently re-checked against that source by a second reviewer. That is an evidence check, not legal advice. Rules change; confirm with the authority before you buy or build.

Living off-grid in Washington County, Ohio

Is Washington County a good place to live off-grid or homestead?

Washington County scores 67/100 on the Bolthole Index, a strong county profile. Its strengths: manageable long-term carry cost and a durable current and mid-century hazard profile. Watch-outs: a weaker property-autonomy legal backdrop.

Do you need a building permit in Washington County, Ohio?

Washington County generally requires a residential building permit, and it has no county-wide zoning. Onsite septic is permitted by Washington County Health Department (Environmental Health). These answers are quoted from official sources and independently re-checked. Rules change and cities within the county differ — always confirm with the county before you buy or build.

How much does land cost in Washington County, Ohio?

Land in Washington County runs about $4,671 per acre, based on the latest county data.

What is the water situation in Washington County?

Washington County gets about 44.1" of rain a year, with severe drought in roughly 2.2% of years.

How remote is Washington County?

A representative private-land location has about 38,692 people within a 30-minute drive and 1,945,763 within two hours. The road-network catchments count population across county lines and clusters of smaller cities; straight-line radius values remain available as a comparison.

Building permits, zoning and land rules in Washington County, Ohio

At a glance

Who to call

Do you need a building permit in Washington County, Ohio?

Who handles permits in Washington County, and how do you reach them?

Does Washington County have zoning?

How do septic permits work in Washington County, Ohio?

Can you live in an RV or tiny home on your land in Washington County?

Building a home in Washington County: the steps, in order

What to check before you buy land in Washington County, Ohio

Watch-outs

Sources

Washington County in Ohio

How Washington County scores

Find land. Bring the promising ones back.

Parcel due diligence

Answers from the rulebook for Washington County

Washington County rules

Ohio rules that apply here

Inside cities and towns in Washington County

Still unanswered

Living off-grid in Washington County, Ohio

Is Washington County a good place to live off-grid or homestead?

Do you need a building permit in Washington County, Ohio?

How much does land cost in Washington County, Ohio?

What is the water situation in Washington County?

How remote is Washington County?

How Washington compares in Ohio