Washington County, Indiana requires a site improvement application for a new residential structure in county jurisdiction.1 County-regulated construction receives phased inspections, and a new home needs a certificate of occupancy before anyone moves in.23 Start with the Highway Department for a new driveway, then obtain septic approval before taking the building application to the Building Department.45
At a glance
- Building permit
- Required for new residential structures in county jurisdiction1
- Zoning
- County zoning applies outside land covered by Salem or Livonia ordinances6
- Septic permit
- Required through the Washington County Health Department75
- RV or camper
- Requires a site improvement application; flood-hazard areas add placement limits84
- Tiny home
- An off-site manufactured unit needs HUD identification or Indiana modular marking4
- Owner-builder
- An owner may obtain the permit, but no exemption from permits or inspections was confirmed94
- Private well
- County permit requirement unconfirmed; ask Environmental Health before drilling1011
Who to call
Building permits
Washington County Building Department
Site improvement applications, residential inspections, certificates of occupancy, county zoning questions and local floodplain development review
601 Anson Street, Salem, IN 47167
Septic permits
Washington County Health Department Environmental Health
Private sewage disposal permits, septic plan review, inspections and environmental-health questions
806 Martinsburg Road, Suite 100, Salem, IN 47167
Roads & driveways
Washington County Highway Department
Driveway permits for new driveways, driveway extensions and culvert replacements on county-controlled roads
600 Anson Street, Salem, IN 47167
Contact details are copied from each office’s official page and were checked against it on September 27, 2026.
Do you need a building permit in Washington County, Indiana?
Yes. Washington County requires a site improvement application for a new single-family or multifamily residence in county jurisdiction.1 The county also lists residential additions and remodels, attached garages, mobile or manufactured homes, temporary structures, RVs and campers among projects needing an application.4 Decks, roofing, pools and remodeling that does not increase residential living area are listed as not requiring that application, although another permit may still apply.4 Permit fees are based on gross project area, including basements and garages, and the published schedule runs from $50 through $500.12 Indiana has adopted statewide building codes, while local jurisdictions retain authority to require permits and create inspection schedules.1314
Who is the Washington County building department, and how do you reach it?
The Washington County Building Department handles site improvement applications and county building-code administration at 601 Anson Street, Salem, IN 47167; call 812-883-0139 or email [email protected].4 The same county page directs Salem city-limit and annex-area projects to the City of Salem Building Department, so establish the parcel's jurisdiction before applying.4 Washington County requires evaluations at each phase of covered construction, requested at least 24 hours ahead; missed evaluations can bring fines or stop-work orders.2 A final inspection determines compliance, and the certificate of occupancy must be issued before a new home is occupied.3 For county-road access, the Washington County Highway Department is at 600 Anson Street, Salem, IN 47167 and can be reached at 812-883-3538.15
Does Washington County have zoning?
Yes. Washington County's zoning chapter applies to county land not covered by the ordinances of Salem or Livonia.6 The correct authority therefore depends on the property's city, township and county jurisdiction, and some Washington Township subdivision territory goes to the Salem Plan Commission.16 Ask the Washington County Building Department to confirm jurisdiction, the zoning district, allowed use and site standards before choosing a building location.4 The county page publishes general setbacks of 5 feet from the property line and 10 feet from the residence, but a parcel's zoning and project type still need confirmation.4 Washington County's reviewed material does not establish a county owner-builder exemption, minimum dwelling area, accessory-dwelling rule or general agricultural exemption.917
How do septic permits work in Washington County?
The Washington County Health Department's Environmental Health section issues private sewage permits and inspects new septic construction.18 For a new system, first receive the driveway permit, then submit the septic application, legal description and current recorded deed and pay the $100 fee.5 A certified soil scientist must test the site, and the installer must complete plan review with the county environmentalist before the construction permit is issued.5 The office is at 806 Martinsburg Road, Suite 100, Salem, IN 47167; call (812) 883-5603 ext. 8 or email [email protected].11 Only about 29.9% of mapped county soils are rated without severe limitations for a conventional drain field, so settle septic feasibility before fixing the house site.19 Indiana sanitation rules generally require a compliant septic tank and soil absorption system where a dwelling lacks sewer service.20
Can you live in an RV or tiny home on land in Washington County?
Washington County requires a site improvement application for an RV, camper or temporary structure in county jurisdiction, and those temporary units do not receive a permanent emergency-service address.84 In a special flood-hazard area, an RV must be on site for less than 180 days and remain licensed and highway-ready, or it must meet the requirements for a manufactured home.8 That floodplain rule does not answer how long an RV may be occupied on every private parcel, so ask the Building Department about the proposed location, duration, utilities and residential use.4 For an off-site manufactured tiny home or cabin, the county requires a HUD identification plate or Indiana industrialized-building or modular marking.4 Washington County's reviewed rules do not confirm a general minimum dwelling size or temporary-camping allowance.21
Building a home in Washington County: what are the steps?
- Ask the Washington County Building Department to confirm jurisdiction, zoning, allowed residential use, setbacks and whether the site is in a special flood-hazard area.6224
- Obtain the county Highway Department's driveway permit before seeking the septic permit or permanent address.155
- Apply to Environmental Health for septic approval, arrange the certified soil test and have the installer complete plan review.5
- Take the septic permit and ownership documentation to the Building Department for the site improvement application.11
- Request each construction evaluation at least 24 hours in advance.2
- Complete the final inspection and obtain the certificate of occupancy before moving into the new home.3
- For a state-highway entrance, use Indiana's electronic permit system rather than the county-road process.23
What should you check before buying land in Washington County?
Confirm whether county, Salem or Livonia zoning governs the parcel before relying on a listing's description of permitted use.6 Check flood maps early because Washington County requires a floodplain development permit before development begins in a special flood-hazard area, and Indiana DNR controls most floodway development.2224 Commission a soil evaluation before fixing a homesite because only about 29.9% of mapped soils avoid severe limits for a conventional septic drain field.19 Confirm legal road access and the correct driveway authority; a state-highway connection requires permission from Indiana, while county driveway work goes through the Highway Department.2315 The county's standalone private-well permit requirement could not be confirmed, so ask Environmental Health before arranging drilling.1011 For carrying-cost context, the median property-tax bill is about $1,058 per year and the effective rate is about 0.7%.2526
Watch-outs
- Washington County requires construction evaluations at least 24 hours in advance, and missed evaluations may lead to fines or stop-work orders.2
- A new Washington County home cannot be occupied until the final inspection is complete and the certificate of occupancy has been issued.3
- No county owner-builder exemption, general private-land camping rule, minimum dwelling size or standalone well-permit answer was confirmed; ask the Building Department and Environmental Health before relying on any of them.910411
Sources
- Washington County Building Commissioner (2026 county census)
- Washington County Building Commissioner, quoted and re-checked
- Washington County Building Commissioner, quoted and re-checked
- Washington County Building Department (washingtoncounty.in.gov)
- Washington County: Septic Systems, quoted and re-checked
- Washington County, Indiana Title XV Land Usage, quoted and re-checked
- Washington County: Septic Systems (2026 county census)
- Washington County Building Commissioner, quoted and re-checked
- (2026 county census)
- Recommended Standards For Private Water Wells (Indiana statewide rule), quoted and re-checked
- Washington County Health Department Environmental Health (in.gov)
- Washington County Building Commissioner, quoted and re-checked
- Rules of the Indiana Fire Prevention and Building Safety Commission (Indiana statewide rule), quoted and re-checked
- DHS: Boards and Commissions (Indiana statewide rule), quoted and re-checked
- Washington County Highway Department (washingtoncounty.in.gov)
- Washington County, Indiana Title XV Land Usage, quoted and re-checked
- Plan Review FAQs (Indiana statewide rule), quoted and re-checked
- Washington County: Septic Systems, quoted and re-checked
- Share of soils without severe limits for a conventional septic drain field (USDA SSURGO): Bolthole Index county data
- 410 IAC 6-8.3 Residential On-Site Sewage Systems (Indiana statewide rule), quoted and re-checked
- Washington County, Indiana Title XV Land Usage (2026 county census)
- Washington County, Indiana Title XV Land Usage, quoted and re-checked
- INDOT Driveway Permit Guide 2024 (Indiana statewide rule), quoted and re-checked
- Water: Community Assistance & Information (Indiana statewide rule), quoted and re-checked
- Median property tax bill: Bolthole Index county data
- Effective property tax rate: Bolthole Index county data
Written September 27, 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.