Building permits, zoning and septic rules across Missouri counties

At a glance

Residential building permits

75 counties: not required; 8: required only in some cases; 29: required¹⁸⁹

Countywide zoning

54 counties have none; 29 have zoning; 32 remain unconfirmed³¹⁰¹¹

No building permit and no countywide zoning

50 counties¹²

Septic construction permits

DHSS or local authority; most installations and repairs require approval⁵¹³

RV living

29 counties have an answer: 19 allowed, 1 temporary-only, 8 limited, 1 prohibited⁶

Tiny homes

25 counties have an answer: 19 allowed, 6 limited⁷

Domestic wells

Reasonable-use water regime; well construction standards and contractor permits still apply¹⁴¹⁵

Property tax

Median county effective rate: 0.7%; median county bill: $1,101 annually¹⁶

Who to call

Contact details are copied from each office’s official page and were checked against it on October 10, 2026.

Which Missouri counties don't require a building permit?

Missouri has 75 counties without a residential building-permit requirement, including Texas County, Bollinger County, Dallas County.¹ Another 8 counties require building permits only in certain cases, while 29 require residential building permits; the limited category is separate from the no-permit category.⁸⁹ Building-permit status remains unconfirmed in 3 counties.¹¹

Use the Missouri no-building-codes list to narrow a search, then ask the chosen county's building office about the proposed structure: Missouri's framework relies on local code adoption.¹² Missouri's farm-structure fire-ordinance exemption does not establish an exemption from every building, zoning, floodplain or septic requirement.¹⁷

Which Missouri counties have no zoning?

Missouri has 54 counties without countywide zoning, including Texas County, Bollinger County, Dallas County.³ County zoning is present in 29 counties, and we could not confirm the zoning answer for 32 counties.¹⁰¹¹ Missouri county zoning authority applies to unincorporated territory; an address inside city limits needs the city's answer.⁴

The no-zoning list identifies counties without countywide zoning, while the no-building-permit and no-zoning list narrows the overlap to 50 counties.³¹² A no-zoning answer does not remove Missouri septic approval or floodplain development requirements, so ask the septic authority and community floodplain administrator about the parcel before choosing a house site.¹³¹⁸

Who issues septic construction permits in Missouri?

Missouri's septic authority pattern is 45 counties with state-agency permitting, 6 served by a health district and 64 with county permitting; Missouri DHSS is the common state agency.¹⁹ Start with the DHSS Onsite Wastewater Treatment Program's permitting-authority lookup to identify the agency for the work location.²⁰

Missouri requires a construction permit before installing or repairing most onsite wastewater systems; some single-family lots may qualify for an exemption, and work must wait for a permit or confirmed exemption.¹³ Residential lots smaller than 3 acres require a septic permit, and the acreage exemption does not apply in some counties.²¹ DHSS application fees for construction, modifications and repairs are temporarily suspended effective August 28, 2026; local processes may vary, so ask the permitting authority about current charges.²² DNR handles non-single-family lagoons, surface-water discharges and certain larger systems.⁵

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

Missouri RV occupancy answers cover 29 counties: 19 allow it, 1 allows temporary occupancy only, 8 impose limitations and 1 prohibits it; the remaining 86 counties are unanswered.⁶ Tiny-home occupancy answers cover 25 counties: 19 allow it and 6 impose limitations, leaving 90 unanswered.⁷

Macon County, Phelps County, Dent County are among the counties allowing RV occupancy under their county land-use answers; septic, floodplain and other applicable requirements still matter.⁶ The same counties also have allowed tiny-home occupancy answers.⁷ Use the RV-living list and tiny-home list for county-specific conditions rather than treating an unanswered county as permission.⁶⁷ A campground planning to use onsite wastewater requires DNR development approval, which does not itself authorize RV residence on a private parcel.²³

Where are the best Missouri counties for a bolthole?

Missouri's highest Bolthole Index scores start with Texas County, Bollinger County, Dallas County: Texas County scores 81, while Bollinger and Dallas counties score 80 on the off-grid and homestead land index.²⁴ These counties have no residential building-permit requirement and no countywide zoning; septic authority is county-level in Texas and Dallas counties and state-level in Bollinger County.²⁴

Sullivan County also scores 80 and has no residential building-permit requirement, but its zoning answer remains unconfirmed; its septic authority is state-level.²⁴ Missouri's median county farmland value is $4,465 per acre, a farmland benchmark rather than an individual parcel asking price.²⁵ The median county effective property-tax rate is 0.7%, and the median county property-tax bill is $1,101 annually; use these medians as context when comparing counties.¹⁶

What water, well and driveway approvals matter in Missouri?

Missouri follows riparian reasonable-use water principles, with domestic and farm groundwater use described as unregulated under reasonable use.¹⁴ Water-use status does not remove well-construction requirements: Missouri requires appropriate installation permits for regulated contractors, while landowners may install their own well or pump without a permit under the applicable law and rules.¹⁵ Ask Missouri Geological Survey about construction standards and any needed variance before drilling.¹⁵²⁶

A public water system needs DNR written approval before constructing or altering a public well, subject to the stated statutory exemptions.²⁷ For road access, constructing or modifying a driveway within MoDOT right-of-way requires a MoDOT permit; the rule does not establish requirements for driveways outside that right-of-way.²⁸ Contact the area Traffic Specialist at least 48 hours before permitted right-of-way work begins.²⁹

Watch-outs

• County counts concern unincorporated land; Missouri cities have their own zoning authority, so identify the jurisdiction before using a county answer.⁴
• Missouri counties can adopt building codes under the applicable statutory process, so confirm current requirements with the county building office before construction.³⁰
• Floodplain development requires approval through the community process, even where an ordinary residential building permit is not required.¹⁸
• A septic acreage exemption must be confirmed by the permitting authority; some counties do not recognize the exemption.²¹
• We could not confirm a general Missouri owner-builder exemption; ask the county or city building office separately about building permits, trade licensing and inspections, which local authorities may regulate.³¹

Sources

1. Bolthole Index county rulebook, 115 Missouri counties, as of October 10, 2026: Missouri counties that do not require a residential building permit in unincorporated areas
2. Missouri: RSMo Section 64.170, quoted and re-checked
3. Bolthole Index county rulebook, 115 Missouri counties, as of October 10, 2026: Missouri counties with no county-wide zoning
4. Missouri: RSMo § 64.090 — Planning and zoning powers of county commission, quoted and re-checked
5. Missouri: OWTS Construction Permit Process, quoted and re-checked
6. Bolthole Index county rulebook, 115 Missouri counties, as of October 10, 2026: Missouri counties' answers on living in an RV on your own land
7. Bolthole Index county rulebook, 115 Missouri counties, as of October 10, 2026: Missouri counties' answers on living in a tiny home on your own land
8. Bolthole Index county rulebook, 115 Missouri counties, as of October 10, 2026: Missouri counties that require a residential building permit only in some cases (for example floodplain or certain structures)
9. Bolthole Index county rulebook, 115 Missouri counties, as of October 10, 2026: Missouri counties that require a residential building permit in unincorporated areas
10. Bolthole Index county rulebook, 115 Missouri counties, as of October 10, 2026: Missouri counties with county zoning
11. Bolthole Index county rulebook, 115 Missouri counties, as of October 10, 2026: Missouri counties whose building-permit or zoning answer we could not confirm
12. Bolthole Index county rulebook, 115 Missouri counties, as of October 10, 2026: Missouri counties with neither a residential building permit nor county-wide zoning
13. Missouri: OWTS Construction Permit Process, quoted and re-checked
14. Missouri water rights and groundwater management: National Agricultural Law Center and Bolthole Index groundwater review
15. Missouri: Water Wells - PUB2945, quoted and re-checked
16. Bolthole Index county rulebook, 115 Missouri counties, as of October 10, 2026: Median of Missouri's county effective property tax rates and median county property tax bills
17. Missouri: RSMo Section 64.003 — Farm buildings and farm structures, quoted and re-checked
18. Missouri: Floodplain Forms, quoted and re-checked
19. Bolthole Index county rulebook, 115 Missouri counties, as of October 10, 2026: Who issues septic permits across Missouri's counties: a state agency, a multi-county health district, or the county
20. Missouri DHSS Onsite Wastewater Treatment Program (health.mo.gov)
21. Missouri: OWTS Construction Permit Process, quoted and re-checked
22. Missouri: OWTS Construction Permit Process, quoted and re-checked
23. Missouri: OWTS Construction Permit Process, quoted and re-checked
24. Bolthole Index county rulebook, 115 Missouri counties, as of October 10, 2026: The 8 highest-scoring Missouri counties on the Bolthole Index (off-grid and homestead land score out of 100), with each one's building-permit, zoning and septic answers
25. Bolthole Index county rulebook, 115 Missouri counties, as of October 10, 2026: Median farmland value per acre across Missouri's counties (USDA census, the middle county's value; USD/acre), with the five least expensive counties
26. Missouri Department of Natural Resources — Missouri Geological Survey (dnr.mo.gov)
27. Missouri: Who Regulates Water Wells in Missouri? - PUB4001, quoted and re-checked
28. Missouri: Permits | Missouri Department of Transportation, quoted and re-checked
29. Missouri: Permit Process | Missouri Department of Transportation, quoted and re-checked
30. Missouri: RSMo Section 64.170 — County commissions control construction; issue building permits, quoted and re-checked
31. Missouri: RSMo § 64.170 — County commissions control construction and issue building permits, quoted and re-checked

Written October 10, 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.