Unincorporated Miller County, Missouri does not require a county building permit for a home1. County zoning remains unconfirmed, so ask the Miller County Commission about parcel-specific land-use rules before building23. Missouri DHSS directly handles Miller County septic permits, while floodplain development requires a separate local permit45.
At a glance
- Building permit
- Not required for a home in unincorporated Miller County1
- Zoning
- County zoning status is unconfirmed; ask the County Commission23
- Septic permit
- Missouri DHSS is the permitting authority for Miller County4
- Septic owner-installer
- A homeowner may install a system, but must confirm permitting first6
- Floodplain permit
- Required for all development in the floodplain5
- RV or tiny-home living
- No countywide occupancy rule could be confirmed; ask the County Commission23
- Private well
- Permits apply to contracted well and pump work; landowners may do their own7
Who to call
Also useful
General county government contact and the place to ask who handles unconfirmed zoning, county-road access, and other parcel-specific county questions
2001 Highway 52, Tuscumbia, MO 65082
Septic permits
Missouri DHSS Onsite Wastewater Treatment Program
Onsite wastewater construction permits for Miller County
930 Wildwood Dr, Jefferson City, MO 65102
Floodplain permits
Miller County Floodplain Administrator
Floodplain administration for unincorporated Miller County
1999 Hwy 52, Tuscumbia, MO 65082
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 Miller County, Missouri?
Unincorporated Miller County does not require a county residential building permit1. Missouri uses local building-code adoption rather than one uniformly adopted statewide building code8. State law gives building-code and permit authority under this framework to first- and second-class counties, with voter approval required when a qualifying county had not adopted a code before August 28, 20019. A project can still need approvals unrelated to a general home-building permit: development in a regulated floodplain needs a floodplain permit, onsite wastewater work commonly needs septic approval, and a driveway within state right-of-way needs MoDOT permission51011. Missouri also prevents county fire-protection ordinances from imposing permits on the erection, repair, alteration, or extension of farm buildings and farm structures, but that protection is not a blanket exemption from septic, floodplain, or land-use requirements12.
Who handles building and land permits in Miller County?
Miller County does not require a county residential building permit in unincorporated areas, and we could not confirm a separate county building-permit office1. For a parcel-specific question, start with the Miller County Commission at 573-369-1900 or [email protected]; the county government page gives the courthouse address as 2001 Highway 52, Tuscumbia, Missouri3. Separate agencies handle the permits that matter most to rural construction. Missouri DHSS is the listed onsite wastewater authority for Miller County and accepts requests for a septic application number through its online request form413. The Miller County Floodplain Administrator handles the county floodplain program and can be reached at (573) 369-234114. For a driveway or other work in MoDOT right-of-way, apply through MoDOT rather than the county11. For access from a county road, ask the County Commission which road official reviews the location because a county-specific access rule could not be confirmed3.
Does Miller County have zoning?
Miller County's countywide zoning status is unconfirmed: no authoritative county zoning ordinance, map, or planning department was located2. Missouri law allows a first-class noncharter county or a second-, third-, or fourth-class county to establish zoning for unincorporated territory only after voters approve county zoning15. That statewide authority does not establish whether Miller County adopted it15. Before relying on a proposed use, ask the Miller County Commission whether the parcel is in unincorporated territory and whether any county land-use rule governs it3. Minimum dwelling size, setbacks, lot coverage, building height, subdivision controls, and long-term RV or tiny-home occupancy could not be confirmed countywide, so the absence of a published zoning page is not proof that those uses are unrestricted2. Property inside an incorporated city can also be governed by that city's rules rather than the county framework15.
How do septic permits work in Miller County?
Missouri DHSS is the onsite wastewater permitting authority for Miller County4. A construction permit is required before installing or repairing most onsite wastewater systems, and residential property under 3 acres generally requires one, subject to the stated county exceptions16. Ask DHSS to confirm an exemption before work begins and request an application number through the program's online form1613. A homeowner may install a personal system, but that owner-installer allowance does not eliminate any required construction permit6. Site and soil planning matters here because only about 1.7% of Miller County soils are rated without severe limitations for a conventional drain field17. Larger-flow systems and certain discharging, nonresidential lagoon, or industrial systems fall under Missouri DNR rather than the ordinary DHSS route18. State law does not require a septic inspection for every real-estate transaction, although a buyer or lender may request one and local requirements may be stricter19.
Can you live in an RV or tiny home in Miller County?
A countywide rule for long-term RV living, temporary camping, or tiny-home occupancy in Miller County could not be confirmed2. Do not read that gap as permission or a prohibition. Ask the Miller County Commission about the parcel's location, occupancy use, setbacks, minimum dwelling size, and any county rule before buying or moving a unit onto unincorporated land32. If the parcel lies inside a city, ask that city because Missouri county zoning authority concerns unincorporated territory15. An RV or tiny home still needs lawful wastewater handling: onsite systems treat and dispose of domestic sewage on the property, permits commonly apply, and wastewater may not simply be discharged onto the ground or into a road ditch20. A floodplain permit is also required for development in the floodplain, regardless of whether the project resembles a conventional house5. Contact the Floodplain Administrator for an unincorporated Miller County site14.
Building a home in Miller County: the steps in order
- Confirm that the parcel is in unincorporated Miller County and ask the County Commission whether any parcel-specific zoning or county-road access rule applies32.
- Check the flood map and contact the Miller County Floodplain Administrator before design work if any part of the site may be in the floodplain; all floodplain development needs a permit, and work in the regulatory floodway also needs an engineering no-rise certificate514.
- Contact Missouri DHSS for a septic site evaluation and confirm whether a construction permit or exemption applies before work starts416.
- Plan water. Contracted well and pump installation requires the applicable state permit, while a landowner may install a personal well or pump without that permit7.
- Obtain a MoDOT permit if the driveway enters state right-of-way; MoDOT may require plans or supporting documents depending on the work1121.
- Build without a county residential building permit only after the separate septic, floodplain, access, and location questions are settled1.
What should you check before buying land in Miller County?
Put septic feasibility near the top of the due-diligence list: only about 1.7% of Miller County soils are rated without severe limitations for a conventional drain field17. Ask DHSS about the proposed homesite before treating a large parcel as automatically permit-exempt1316. Check flood exposure with the county Floodplain Administrator because all development in the floodplain requires a permit514. Confirm whether access meets state or county requirements; a driveway in MoDOT right-of-way needs a state permit, while a county-road rule could not be confirmed113. For a private well, determine who will perform the work because contracted installation requires permits but a landowner's own installation may be exempt7. Miller County is about 58.8% wooded, and about 67% of its land is at a slope of 15% or less, so inspect the actual parcel for clearing and grading needs rather than relying on county averages2223. The effective property-tax rate is about 0.6%, with a median annual bill near $1,0652425.
Watch-outs
- Miller County's zoning status is unconfirmed, not confirmed absent; ask the County Commission before assuming an unincorporated parcel has no land-use restrictions23.
- Every development in the regulated floodplain needs a floodplain permit, and regulatory-floodway work also requires an engineering no-rise certificate5.
- Only about 1.7% of Miller County soils are rated without severe limitations for a conventional septic drain field, so verify the homesite with DHSS early1713.
Sources
- Missouri Open Data - County Building Codes for Missouri (2026 county census)
- (2026 county census)
- Miller County Commission (millercountymo.gov)
- Missouri DHSS - OWTS permitting authority by county (Miller) (2026 county census)
- Floodplain Forms, quoted and re-checked
- Frequently Asked Questions | Missouri Department of Health and Senior Services, quoted and re-checked
- Water Wells - PUB2945, quoted and re-checked
- RSMo Section 64.170 (Missouri statewide rule), quoted and re-checked
- RSMo § 64.170 — County commissions control construction and issue building permits (Missouri statewide rule), quoted and re-checked
- Frequently Asked Questions | Missouri Department of Health and Senior Services, quoted and re-checked
- Permits | Missouri Department of Transportation (Missouri statewide rule), quoted and re-checked
- RSMo Section 64.003 — Farm buildings and farm structures (Missouri statewide rule), quoted and re-checked
- Missouri DHSS Onsite Wastewater Treatment Program (health.mo.gov)
- Miller County Floodplain Administrator (sema.dps.mo.gov)
- RSMo § 64.090 — Planning and zoning powers of county commission (Missouri statewide rule), quoted and re-checked
- OWTS Construction Permit Process (Missouri statewide rule), quoted and re-checked
- Share of soils without severe limits for a conventional septic drain field (USDA SSURGO): Bolthole Index county data
- On-site Septic Systems and Subdivisions (Missouri statewide rule), quoted and re-checked
- Frequently Asked Questions | Missouri Department of Health and Senior Services, quoted and re-checked
- Frequently Asked Questions (Missouri statewide rule), quoted and re-checked
- Permit Process | Missouri Department of Transportation (Missouri statewide rule), quoted and re-checked
- Wooded share of land: Bolthole Index county data
- Share of land at 15% slope or less: Bolthole Index county data
- Effective property tax rate: Bolthole Index county data
- Median property tax bill: Bolthole Index county data
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.