Unincorporated New Madrid County, Missouri does not require a county building permit for a home, but cities may have their own rules1. Countywide zoning could not be confirmed, so ask the County Commission about a parcel23. Missouri DHSS is the listed septic-permitting authority4.
At a glance
- Building permit
- Not required by the county for a home in an unincorporated area1
- County zoning
- Unconfirmed; ask the County Commission about the parcel23
- Septic permit
- Missouri DHSS is the listed authority; most installations and repairs require a permit45
- RV or tiny-home living
- Not confirmed; ask the County Commission before buying23
- Owner-builder exemption
- No county-specific exemption was confirmed6
- Septic soil suitability
- About 1% of soils avoid severe limits for a conventional drain field7
- Property tax
- About 0.7% effective rate and a $746 yearly median bill89
Who to call
Also useful
General county-government and unincorporated land-use questions
450 Main Street, New Madrid, MO 63869
Septic permits
Missouri Department of Health and Senior Services Onsite Wastewater Treatment Program
Onsite wastewater construction permits for New Madrid County
930 Wildwood Dr. Jefferson City, MO 65102
Contact details are copied from each office’s official page and were checked against it on September 29, 2026.
Do you need a building permit in New Madrid County, Missouri?
Unincorporated New Madrid County does not require a county building permit for a home1. Missouri leaves building-code adoption to local governments instead of imposing one uniform statewide code10. Incorporated cities can set their own requirements1. Missouri also prevents county fire ordinances from requiring permits for farm buildings, but that narrow protection does not waive septic, floodplain or land-use rules11.
Who handles New Madrid County building and land questions?
New Madrid County has no identified building or planning department, so begin a general unincorporated land-use question with the County Commission13. The Commission is the governing body and makes decisions about infrastructure, services and local ordinances3. Call (573) 748-2524, email [email protected], or visit 450 Main Street, New Madrid, MO 638693. Ask whether the parcel is outside municipal limits and whether zoning, setbacks, driveway or floodplain requirements apply. Missouri DNR must approve a subdivision that plans to use onsite wastewater systems, but that requirement does not establish a general county subdivision process12. Contact Missouri DHSS directly for septic construction413.
Does New Madrid County have zoning?
Countywide zoning in unincorporated New Madrid County could not be confirmed; the zoning material located belongs to the incorporated City of New Madrid2. Missouri allows certain non-charter counties to establish zoning only after voters approve the question, but that authority does not prove New Madrid County adopted it14. Available county-specific information does not establish setbacks, lot coverage, building-height limits, minimum home size or minimum lot size2. Ask the County Commission for a parcel-specific answer before placing a home, dividing land or treating property as unrestricted3.
How do septic permits work in New Madrid County?
Missouri DHSS lists itself as the onsite-wastewater permitting authority for New Madrid County15. A construction permit is required before installing or repairing most systems, and work should wait until DHSS issues a permit or confirms an exemption5. Residential property under 3 acres generally requires a permit, but the state says the exemption rule differs in some counties and the New Madrid listing does not resolve that exception; ask DHSS to confirm the parcel5. Nonresidential systems require a permit regardless of parcel size5. Request an application number online, call (573) 751-6095 ext.5, or email [email protected]13. Application fees have been temporarily suspended since August 28, 202616. Only about 1% of county soils avoid severe limitations for a conventional drain field7.
Can you live in an RV or tiny home in New Madrid County?
We could not confirm a countywide rule allowing or prohibiting long-term RV living, temporary camping or tiny-home occupancy in unincorporated New Madrid County2. The lack of an identified county building-permit program does not itself authorize occupancy in an RV or tiny home1. Before buying, ask the County Commission whether the parcel is subject to a county rule, subdivision restriction or other local requirement3. Establish a lawful wastewater plan with Missouri DHSS because most new onsite systems require approval17. A tiny home inside a city may face municipal rules2.
How do you build a home in New Madrid County, step by step?
- Verify that the parcel is in unincorporated New Madrid County; the county answer does not control inside a city1.
- Test wastewater suitability because only about 1% of county soils avoid severe drain-field limits7.
- Request a septic application number, and do not start system work until DHSS confirms a permit or exemption1813.
- If the driveway enters a state highway, obtain a MoDOT right-of-way permit19.
- Use qualified plans and inspections despite the reported absence of a county home-building permit1.
What should you check before buying land in New Madrid County?
Make wastewater feasibility a purchase contingency because only about 1% of county soils avoid severe conventional drain-field limits7. A proposed subdivision using onsite wastewater also needs Missouri DNR approval12. About 100% of the county has slopes of 15% or less, while about 6.1% is wooded2021. Typical farmland value is about $6,704 per acre and typical home value is about $104,7682223. The effective property-tax rate is about 0.7%, with a $746 median annual bill89. Confirm water, legal access and flood exposure for the parcel, and ask the County Commission for a parcel-specific zoning answer before closing23.
Watch-outs
- Countywide zoning, setbacks, minimum dwelling size and RV occupancy remain unconfirmed; ask the County Commission about the parcel23.
- The state dataset supports the no-county-permit answer, but its blank entries are not an express county statement; confirm unusual projects with the County Commission13.
- Only about 1% of county soils avoid severe limitations for a conventional septic drain field, so evaluate the site before choosing a house location7.
Sources
- State of Missouri - County Building Codes dataset (data.mo.gov) (2026 county census)
- (2026 county census)
- New Madrid County Commission (newmadridcountymo.gov)
- Missouri DHSS - OWTS permitting authority by county (New Madrid) (2026 county census)
- OWTS Construction Permit Process, quoted and re-checked
- (2026 county census)
- Share of soils without severe limits for a conventional septic drain field (USDA SSURGO): Bolthole Index county data
- Effective property tax rate: Bolthole Index county data
- Median property tax bill: Bolthole Index county data
- RSMo Section 64.170 (Missouri statewide rule), quoted and re-checked
- RSMo Section 64.003 — Farm buildings and farm structures (Missouri statewide rule), quoted and re-checked
- OWTS Construction Permit Process, quoted and re-checked
- Missouri Department of Health and Senior Services Onsite Wastewater Treatment Program (health.mo.gov)
- RSMo § 64.090 — Planning and zoning powers of county commission (Missouri statewide rule), quoted and re-checked
- OWTS Construction Permit Process — New Madrid County authority listing, quoted and re-checked
- OWTS Construction Permit Process fee update, quoted and re-checked
- OWTS Construction Permit Process, quoted and re-checked
- OWTS Construction Permit Process, quoted and re-checked
- Permits | Missouri Department of Transportation (Missouri statewide rule), quoted and re-checked
- Share of land at 15% slope or less: Bolthole Index county data
- Wooded share of land: Bolthole Index county data
- Farmland value per acre (USDA census): Bolthole Index county data
- Typical home value (Zillow): Bolthole Index county data
Written September 29, 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.