St. Francois County, Missouri requires a building permit before any new development begins, including in rural and unincorporated areas; the permit comes from the County Clerk's Office and costs $201. We could not confirm county zoning for unincorporated land, so ask the County Commission; the City of Farmington does run its own zoning and building codes23. Septic permits go through the St. Francois County Health Center's Environmental Health Department under a county onsite wastewater ordinance, and a development in a regulated floodplain needs a separate floodplain permit45.
At a glance
- Building permit
- Required countywide before all new development; $20 from the County Clerk's Office16
- Zoning
- Not confirmed; ask the County Commission about the parcel27
- Septic permit
- Environmental Health issues permits for new systems and major repairs89
- Floodplain permit
- Required separately for development in a regulated floodplain5
- RV or tiny-home living
- Not confirmed; ask the County Commission before relying on either use27
- Private well
- Contractors need state permits; a landowner may install their own well or pump without one10
- State-highway driveway
- A new or modified driveway in MoDOT right-of-way needs a permit11
Who to call
Building permits
St. Francois County Clerk's Office
Maintains building permits and other county licenses
1 West Liberty Street, Annex Building, Suite 300, Farmington, Missouri 63640
Floodplain permits
St. Francois County Floodplain Manager
Provides floodplain maps and information on building and floodplain development permits
1 West Liberty Street, Annex Building, Suite 301, Farmington, Missouri 63640
Septic permits
St. Francois County Health Center, Environmental Health Department
Regulates onsite wastewater treatment systems and issues construction permits for new systems and major repairs
1025 West Main Street, Park Hills, Missouri 63601
Also useful
St. Francois County Commission
Handles county business and parcel-use questions not assigned to another county office
1 West Liberty Street, Annex Building, Suite 301, Farmington, Missouri 63640
Contact details are copied from each office’s official page and were checked against it on October 9, 2026.
Off-grid gear
Going off-grid in St. Francois County means bringing your own water and power. The kit we’d start with:
- Water Crystal Quest Filter any source — well, rain, or creek — to drinking-clean.
- Power Bluetti Solar generators and home battery backup for living off the grid.
- Septic Soil percolation test kit Run your own perc test before paying an engineer — the first thing a septic office asks about.
- Water Well water test kit Bacteria, nitrates, hardness — know what the well on a parcel is really pumping.
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Do you need a building permit in St. Francois County, Missouri?
Yes. St. Francois County requires a building permit before work begins on all new development, including rural and unincorporated areas covered by the county, and the published fee is $2016. The county materials do not say how city permits fit with the county permit, so owners inside a city should also ask that city before starting work12. Inside Farmington, the city separately requires building permits for new buildings, additions, alterations, changes of use and mechanical, electrical or plumbing work, under the 2015 International Codes adopted in 201813. A city notice has proposed updated 2024 codes, but final adoption was not confirmed14. Septic permits are a separate matter handled by the Health Center, not the Clerk4. A project in a regulated floodplain needs a separate floodplain development permit/application5. New construction in those regulated floodplain locations must be elevated at least one foot above the Base Flood Elevation5. We could not confirm an adopted county building-code edition, a building-inspection schedule, or a certificate-of-occupancy process; ask the County Clerk what plans, inspections, and closeout documents apply to the specific project15.
Who issues St. Francois County building permits, and how do you reach them?
The St. Francois County Clerk's Office maintains building permits and other licenses15. Visit the office at 1 West Liberty Street, Annex Building, Suite 300, Farmington, Missouri 63640, or call 1-573-756-541115. Permit forms are available from the Clerk's Office, and the building permit must be obtained there before work begins16. For flood questions, maps are available at the Floodplain Manager's office in the County Commission office, Room 3015. The Floodplain Manager is at 1 West Liberty Street, Annex Building, Suite 301, Farmington, Missouri 63640, and the phone number is 1-573-431-6505, extension 71917. Ask the Clerk to identify any required inspections because the published county materials do not confirm an inspection schedule15.
Does St. Francois County have zoning?
We could not confirm that St. Francois County has adopted county zoning or published county zoning districts2. Missouri allows qualifying counties to establish zoning for unincorporated territory only after the question is submitted to county voters and a majority favors zoning18. That statewide authority does not prove St. Francois County adopted zoning18. Ask the County Commission whether zoning applies to the parcel and whether there are rules for setbacks, minimum dwelling size, minimum lot size, building height, lot coverage, accessory dwellings, manufactured homes, or subdivision7. The Commission is at 1 West Liberty Street, Annex Building, Suite 301, Farmington, Missouri 63640, and can be reached at 1-573-756-36237. City rules differ: Farmington is divided into zoning districts, and uses in each district follow that district's regulations, with some uses allowed only by Special Use Permit after review by the Planning and Zoning Commission and City Council19. Buildings inside most Farmington zoning districts must sit a minimum distance from each lot line, with the exact distance varying by property20. None of that applies to unincorporated land unless the county confirms its own zoning.
How do septic permits work in St. Francois County?
The St. Francois County Health Center's Environmental Health Department regulates onsite wastewater treatment systems and issues the construction permit required for a new system or a major repair89. To begin, submit a construction permit application, an OWTS design plan, and a soil morphology; the soil scientist and installer must be registered with the Missouri health department9. Call 573-431-1947, email info@sfchealth.org, or visit 1025 West Main Street, Park Hills, Missouri 636019. The Health Center administers permitting under a county onsite wastewater ordinance that may impose requirements beyond the state minimum, and a permit must be issued before construction begins4. A permit is required for residential property under three acres, and the state acreage exemption does not apply in every county, so confirm eligibility with Environmental Health before work21. Missouri's state health department temporarily suspended onsite wastewater application fees effective August 28, 2026, so ask Environmental Health what fee applies today21. Some incorporated cities fall outside the local septic permitting authority, and the state health department takes over the permit for work in those cities, so check the address before applying4. Missouri does not require a septic inspection for every real-estate transaction, but a lender or buyer may request one and any requested inspection must be performed by a licensed individual; ask Environmental Health whether St. Francois County adds a local sale requirement22. Only about 13% of county soils are rated without severe limitations for a conventional drain field, so settle the soil evaluation and system design before choosing a house site23.
Can you live in an RV or tiny home in St. Francois County?
We could not confirm a St. Francois County rule that specifically allows or prohibits living in an RV, temporary camping, or occupying a tiny home on private land2. Ask the County Commission whether the parcel is subject to zoning or another occupancy restriction before relying on an RV or tiny home as housing7. A tiny home that constitutes new development still requires the county building permit before work begins12. An off-grid arrangement also does not remove wastewater rules: Missouri generally requires an onsite wastewater construction permit, and wastewater may not be discharged into a road ditch or onto the ground24. The Health Center requires an OWTS construction permit for a new onsite system or a major repair9. We also could not confirm a county minimum dwelling size, setback schedule, or owner-builder exemption, so ask the Commission about land use and the Clerk about permit treatment for the exact structure715.
Building a home in St. Francois County: the steps, in order
- Ask the County Commission whether zoning, setbacks, subdivision rules, or an occupancy restriction applies to the parcel27.
- Ask the County Clerk what plans and inspections are required, then obtain the $20 building permit before starting new development1215.
- Check the county floodplain maps; regulated-floodplain development needs a separate permit, and new construction there must be at least one foot above the Base Flood Elevation5.
- If the home needs an onsite wastewater system, submit the application, design plan, and soil morphology to Environmental Health9.
- For a private well, confirm the installer has the applicable state permit; Missouri allows landowners to install their own well or pump without that permit10.
- Obtain a MoDOT permit before constructing or modifying a driveway in state right-of-way11.
- Before closing walls or occupying the home, ask the Clerk which inspections or completion documents apply because we could not confirm a published county schedule15.
What should you check before buying land in St. Francois County?
Start with wastewater feasibility: only about 13% of St. Francois County soils are rated without severe limitations for a conventional drain field23. Ask Environmental Health for the required soil and design process before fixing the house site9. Check the county floodplain maps because regulated-floodplain development needs an additional permit and new construction there has an elevation requirement5. Confirm legal access, and remember that a new or modified driveway within MoDOT right-of-way requires a state permit11. Ask the County Commission about zoning, setbacks, subdivision, RV use, and tiny-home occupancy because we could not confirm county rules for those topics27. For budgeting, the effective property-tax rate is about 0.7%, and the median annual property-tax bill is about $1,1612526. If a private well is planned, decide who will install it and confirm the applicable state permit before work begins10.
Watch-outs
- A county building permit does not replace the separate floodplain development permit required for a project in a regulated floodplain5.
- We could not confirm county zoning, RV occupancy, tiny-home occupancy, setbacks, or minimum dwelling size; ask the County Commission about the parcel before buying27.
- The farm-building and farm-structure exemption applies only to county fire-protection or fire-prevention ordinances; it does not erase building, floodplain, septic, zoning, subdivision, municipal, state, or federal requirements27.
Sources
- St. Francois County Floodplain, quoted and re-checked
- (2026 county census)
- Farmington Planning and Zoning, quoted and re-checked
- OWTS Construction Permit Process, quoted and re-checked
- St. Francois County Floodplain, quoted and re-checked
- St. Francois County Floodplain, quoted and re-checked
- St. Francois County Commission (sfcgov.org)
- OWTS Construction Permit Process (2026 county census)
- St. Francois County Health Center, Environmental Health Department (sfchealth.org)
- Water Wells - PUB2945, quoted and re-checked
- Permits | Missouri Department of Transportation (Missouri statewide rule), quoted and re-checked
- St. Francois County Floodplain, quoted and re-checked
- Building Permits, quoted and re-checked
- Building Permits, quoted and re-checked
- St. Francois County Clerk's Office (sfcgov.org)
- St. Francois County Floodplain, quoted and re-checked
- St. Francois County Floodplain Manager (sfcgov.org)
- RSMo § 64.090 — Planning and zoning powers of county commission (Missouri statewide rule), quoted and re-checked
- Farmington Planning and Zoning, quoted and re-checked
- Building Permits, quoted and re-checked
- health.mo.gov, quoted and re-checked
- health.mo.gov, quoted and re-checked
- Share of soils USDA rates "not limited" for a conventional septic drain field (SSURGO). A strict rating: the median county is about 6% and a tenth of counties are 0%, so a low figure means most lots need a site evaluation or an engineered system, not that septic is impossible. Cite it only with that caveat: Bolthole Index county data
- health.mo.gov (Missouri statewide rule), quoted and re-checked
- Effective property tax rate: Bolthole Index county data
- Median property tax bill: Bolthole Index county data
- RSMo § 64.003 — Farm buildings and farm structures, quoted and re-checked
Written October 9, 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.