Bolthole Index

Marion County, Missouri

Building permits, zoning and land rules in Marion County, Missouri

66Index Score / 100
#81 of 115 in Missouri

Unincorporated Marion County, Missouri requires building permits and county zoning approval for new buildings, additions and land-use changes1,2. Start with the County Coordinator for building permits and zoning; apply to the Marion County Health Department for individual onsite wastewater before the county issues a building permit1. City zoning and private-sewage approvals differ inside Hannibal and the portion of Monroe City that reaches into Marion County3,4,5,6.

Do you need a building permit in Marion County, Missouri?

Unincorporated Marion County requires building permits, with administrative approval or disapproval shown on the application.

Unincorporated Marion County requires building permits, with administrative approval or disapproval shown on the application1. The published building-permit fee is 0.002 of construction cost2. A project using an individual onsite wastewater system must apply to the Marion County Health Department before the building permit is issued1. Floodplain development requires a separate permit; floodway projects need certification of no increase in base flood elevations9. Monroe City, which lies mainly in Monroe County but reaches into Marion County, issues its own building permits for structural changes and electrical upgrades10. Private sewage systems inside Monroe City need a written permit signed by the city superintendent6.

Who is the Marion County building department?

Marion County administers building permits through the County Coordinator's office rather than listing a separate building department.

Marion County administers building permits through the County Coordinator's office rather than listing a separate building department1. The office advises the Planning and Zoning Commission and answers public zoning questions1. Bring the legal description, a sketch showing the proposed use, a description of that use and the development cost; the Administrative Officer checks the zoning map and collects the required fee for a conforming proposal2. A proposal that does not meet district use, lot or yard standards may need a County Commission district change or Board of Adjustment modification1,2. The Land Use Order excludes farm buildings that state law prevents the county from controlling, but health, wastewater, floodplain and safety requirements may still apply2. We could not confirm a residential code edition, building-inspection schedule, certificate of occupancy or owner-builder exemption; ask the County Coordinator before pricing the work1,11.

Does Marion County, Missouri have zoning?

Marion County's Land Use Order governs construction and land-use changes in unincorporated areas.

Marion County's Land Use Order governs construction and land-use changes in unincorporated areas1,2. Hannibal sets its own zoning; private or semi-public sewage disposal there requires a city building-inspector permit and compliance with state regulations3,4. Monroe City, which reaches into Marion County from Monroe County, sets its own zoning and requires city-superintendent approval for private sewage systems5,6. The county's Official Land Use District Map is kept with the County Clerk2. In unincorporated Marion County, R-1 one-family dwellings require at least 1 acre and 200 feet of width; R-R single-family dwellings require at least 3 acres and 200 feet of width2. R-1 yards are 80 feet in front, 30 feet on the sides and 40 feet in the rear; R-R yards are 80 feet in front, 50 feet on the sides and 80 feet in the rear2. R-1 requires municipal sewer, a sewer district or a collection system, subject to an onsite-wastewater exception; where onsite wastewater is required, the larger of the district minimum and wastewater-system lot requirement controls2.

How do septic permits work in Marion County?

For unincorporated Marion County, the Marion County Health Department administers onsite-wastewater permits and works with owners and installers on applications, installation and onsite evaluations.

For unincorporated Marion County, the Marion County Health Department administers onsite-wastewater permits and works with owners and installers on applications, installation and onsite evaluations1,12. Apply before seeking the building permit because Marion County requires the wastewater application first1. Most installations or repairs require a construction permit, although some single-family residential lots may qualify for an exemption; do not start until the proper authority confirms the permit or exemption13. Missouri temporarily suspended state onsite-wastewater application fees effective August 28, 2026, but local-authority processes may differ, so ask the Health Department about the current Marion County charge7,12. Palmyra requires city notice and approval before private sewage construction where public sewer is unavailable14. Missouri DNR handles specified non-domestic, surface-discharge and larger systems1. Only 5.1% of Marion County soils avoid severe limits for a conventional drain field, so evaluate the site before fixing the house location or purchase budget15.

Can you live in an RV or tiny home in Marion County?

Marion County's C-4 district provides for temporary and permanent housing in mobile-home or recreational-vehicle parks, but the Land Use Order does not establish a general rule for occupying an individual RV elsewhere.

Marion County's C-4 district provides for temporary and permanent housing in mobile-home or recreational-vehicle parks, but the Land Use Order does not establish a general rule for occupying an individual RV elsewhere2. We could not confirm temporary camping outside those parks, tiny-home occupancy or minimum dwelling floor area; ask the County Coordinator about the parcel, duration and utility plan1. A single mobile home is allowed in R-1 and R-R when district lot, frontage, yard and wastewater conditions are met2. New C-4 manufactured-home parks require at least 10 acres, professional-engineer design and compliance with health and wastewater standards2. In unincorporated Marion County’s A-1 district, a farmstead may have a farm dwelling plus one other dwelling, with at least 1 acre for the second dwelling; that provision does not establish a countywide accessory-dwelling allowance2. An occupied unit needing onsite wastewater must go through the Health Department's permit or exemption determination12,16.

How do you build a home in Marion County, step by step?

Contact the County Coordinator with the legal description, property sketch and proposed use so the Administrative Officer can check the Official Land Use District Map.

  1. Contact the County Coordinator with the legal description, property sketch and proposed use so the Administrative Officer can check the Official Land Use District Map1,2.
  1. Confirm that the use, minimum lot size and setbacks fit the district, or learn whether a district change or Board of Adjustment modification is needed2.
  1. If a water or sewer district will serve the development, obtain its review and acknowledgement of service ability and system acceptance2.
  1. For onsite wastewater, apply to the Marion County Health Department before the county building permit and confirm the current local fee1,7,12.
  1. Submit the construction cost and permit materials; the building-permit fee is 0.002 of construction cost17.
  1. If the site is in a floodplain or floodway, complete the separate floodplain application and required certification9.
  1. Ask which inspections and completion documents apply, because we could not confirm them1.

What should you check before buying land in Marion County?

Confirm the zoning district and subdivision history before relying on acreage alone: residential land generally must meet Marion County Subdivision Regulations, and a common-plan division into 3 or more lots is treated as residential housing development.

Confirm the zoning district and subdivision history before relying on acreage alone: residential land generally must meet Marion County Subdivision Regulations, and a common-plan division into 3 or more lots is treated as residential housing development2. A-1’s 1-acre rule applies to the second farmstead dwelling, not a general minimum for every A-1 home; sales creating tracts smaller than 10 acres must go before Planning and Zoning for possible rezoning2. R-R parcels need a wastewater system designed to fit the site, and subsequent splits require Planning and Zoning Commission review and County Commission approval2. Check the Flood Plain Map with the County Coordinator because floodplain development requires a separate permit1,2. Missouri regulates well work by contractors, while landowners may install their own well or pump without that permit8. Marion County's effective property-tax rate is about 0.9%, and the median annual bill is about $1,37315. We could not confirm a general county driveway permit rule; ask the road authority serving the frontage before closing1.

Watch-outs

  • Do not schedule construction before septic review when the home will use an individual wastewater system; Marion County requires the Health Department application before issuing the building permit1.
  • Minimum residential acreage does not guarantee a workable septic layout: only 5.1% of Marion County soils avoid severe limitations for a conventional drain field2,15.
  • Missouri's state onsite-wastewater application fees are temporarily suspended, but Marion County's local process may differ; ask the Health Department for the current charge7,12.
  • C-4 addresses RV parks, not general RV living on an individual parcel; temporary camping and tiny-home occupancy remain unconfirmed1,2.

Sources

17 official pages, each quoted and re-checked · written October 12, 2026

  1. marioncounty-mo.gov
  2. Land Use Order for Marion County
  3. Hannibal: Building Inspector | City of Hannibal, MO (Marion County)
  4. Hannibal: Hannibal Code § 25-72, Private or semi-public sewage disposal (Marion County)
  5. Monroe City: Chapter 90 - Zoning, Definitions (Marion County)
  6. Monroe City: Private Sewage Disposal System Permit Required; Fees (Marion County)
  7. OWTS Construction Permit Process (Missouri statewide rule)
  8. Water Wells - PUB2945
  9. Floodplain Development Permit/Application
  10. Monroe City: Building Permit (Marion County)
  11. RSMo 701.055 — Property owners may install, modify or clean their own on-site sewage disposal system (2026 county census)
  12. Marion County Health Department, Environmental Public Health (marioncountyhd.org)
  13. health.mo.gov
  14. Palmyra: Chapter 700 Public and Private Sewers and Drains (Marion County)
  15. 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
  16. OWTS Construction Permit Process
  17. Application for Building Permit

Written October 12, 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.

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Compared with neighboring counties

Unlike 4 of its 6 neighbors, Marion County requires a building permit for a home.

RuleMarion CountyRalls CountyLewis CountyShelby CountyMonroe CountyKnox CountyPike County
Building permitRequiredRequiredNot requiredNot requiredRequiredLimitedLimited
County zoningYesYesNot publishedNoYesNot publishedNo
Septic permitsCounty Health Dept.County Health Dept.MO DHSS Onsite Wastewater Treatment ProgramMO Dept. of Health & Senior ServicesCounty Health Dept.MO Dept. of Health & Senior ServicesCounty Health Dept.

County locator

Marion County in Missouri

66
County map
Marion County highlighted among the Missouri counties · colored by Index score

How Marion County scores

66 / 100 · #81 of 115 in Missouri · six factors, land price, tax, rain and climate

Seclusion52100% ev.
Self-Sufficiency63100% ev.
Admin Boringness4690% ev.
Durability61100% ev.
Property Autonomy47100% ev.
Carry Cost75100% ev.

Evidence strength: 98%. This reports direct-source completeness and fallback use; it is separate from the score and is not a confidence interval. How it works →

$199kTypical home
0.9%Property tax
$6,203Land / acre
39.7"Annual rain
4.4% of yrsSevere drought
10.4 / yr (+9)Mid-century 100°F days
16.1 daysMid-century dry spell
1.89" (+5.7%)Mid-century 1-day rain
1.82×Wildfire change factor
100%Forward climate coverage
$1,915Home insurance / yr
4.2% / yrInsurance growth
1.62%Nonrenewal rate
county median (2+ published ZIPs)Insurance basis
67,192People within 30 min
1,207,556People within 2 hr
36,125Radius comparison (15 mi)
64.9People / sq mi
1.2%Federal land
85.1%Land at 15% slope or less
5.1%Soils rated "not limited" for septic (strict USDA rating)
13,982 acWorkable land screen
27.5%Wooded land
48.2 tonsBiomass / forest ac
53.3°FAvg temp

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Cities and towns in Marion County

Inside a city or town, that city usually issues building permits and sets zoning; the county’s rules above cover unincorporated land. Septic, wells and floodplain rules usually stay with the county or state everywhere.

Answers from the rulebook for Marion County

What the ordinances and state agencies actually say — one answer per question, each quoted from the official source and independently re-checked.

Marion County rules

  • Building permitRequired

    Building construction requiring a Marion County building permit.

    • Individual wastewater disposal systems require an application to the Marion County Health Department before a building permit will be issued.
    • Floodplain properties may require an elevation certificate.
    • The form states that building permits are administered through the Marion County Coordinator's Office.

    permit fee: 0.002 cost of construction multiplier · road setback: >= 80 feet from center of road

    “Building permits are required in our county”
    One more reviewed finding on this topic
    • Required — Building construction requiring a Marion County building permit.
      “Building permits are required in our county, and permits are required to install on-site wastewater systems from the Marion County Health Department.”
  • County-wide zoningPresent (with conditions)

    County zoning and land-use regulation in Marion County, including the unincorporated areas governed by the Land Use Order.

    • The Land Use Order procedure applies to constructing new buildings, additions, or changing land uses within unincorporated areas.
    • Permits, district conformity, minimum lot and yard standards, and possible approvals from the County Commission or Board of Adjustment may apply.
    “The office also advises the Planning and Zoning Commission and assists with all zoning questions from the public. Marion County is a zoned county. Building permits are required in our county, and permits are required to install on-site wastewater systems from the Marion County Health Department.”
    2 more reviewed findings on this topic
    • Present (with conditions) — Land-use regulation in the unincorporated areas of Marion County.
      “Marion County is a zoned county. Building permits are required in our county, and permits are required to install on-site wastewater systems from the Marion County Health Department.”
    • Present (with conditions) — Marion County zoning authority, with the detailed Land Use Order procedure expressly applying to unincorporated areas.
      “The office also advises the Planning and Zoning Commission and assists with all zoning questions from the public. Marion County is a zoned county. Building permits are required in our county, and permits are required to install on-site wastewater systems from the Marion County Health Department.”
  • Local zoningPresent (with conditions)

    Land-use and zoning regulation in the unincorporated areas of Marion County.

    • The order's stated procedure applies to constructing new buildings, additions to existing buildings, or changing land uses within the unincorporated areas of Marion County.
    • Applicants must contact the Administrative Officer, provide a legal description, property sketch, and proposed use; the Administrative Officer checks the Official Land Use District Map.
    • If the use conforms to permitted uses and minimum lot and yard widths, the Administrative Officer collects the required fee before issuing a permit.
    • Nonconforming uses may require a County Commission land-use district change or Board of Adjustment modification.
    “The procedure for residents, prospective developers, and other interested parties to follow in matters pertaining to constructing new buildings additions to existing buildings or changing land uses within the unincorporated areas of Marion County, Missouri shall be as follows:”
    2 more reviewed findings on this topic
    • Present (with conditions) — County-administered zoning and land-use controls in unincorporated Marion County.
      “The procedure for residents, prospective developers, and other interested parties to follow in matters pertaining to constructing new buildings additions to existing buildings or changing land uses within the unincorporated areas of Marion County, Missouri shall be as follows:”
    • Present (with conditions) — County Land Use Order and Planning and Zoning Commission regulation of land uses in unincorporated Marion County.
      “changing land uses within the unincorporated areas of Marion County, Missouri”
  • Zoning districtsPublished (with conditions)

    Land-use districts designated on the Official Land Use District Map for unincorporated Marion County.

    • The Order classifies Marion County into ten districts: A-1, R-1, R-R, C-1, C-2, C-3, C-4, C-5, M-1, and FP.
    • The Official Land Use District Map is kept on file with the County Clerk and changes must be shown when officially adopted by the County Commission.
    • Additional districts may be added upon recommendation of the Planning and Zoning Commission and approval by the County Commission.

    district count: 10 districts (additional districts may be added)

    “Marion County is hereby classified into 10 districts:”
    One more reviewed finding on this topic
    • Published — Official county land-use districts shown in the Land Use Order and designated on the Official Land Use District Map.
      “Marion County is hereby classified into 10 districts:”
  • Minimum lot sizeSpecified

    Residential and other permitted uses in unincorporated Marion County land-use districts.

    • Minimum lot area varies by district and use.
    • R-1 one-family dwellings require 1 acre and 200-foot minimum lot width.
    • R-R single-family dwellings require 3 acres and 200-foot minimum lot width.
    • A-1 agricultural uses commonly require 1 acre, with stated exceptions and rezoning provisions.

    R-1 one-family dwelling: >= 1 acre (minimum lot width 200 feet) · R-R single-family dwelling: >= 3 acres (minimum lot width 200 feet) · A-1 raising crops or livestock: >= 1 acre (use-specific standards may differ)

    “One-family dwelling 1 acre, with a minimum lot width of 200’”
    5 more reviewed findings on this topic
    • Specified — Residential and agricultural uses in county land-use districts.
      “One-family dwelling 1 acre, with a minimum lot width of 200’”
    • Specified — Residential and other listed uses in unincorporated Marion County zoning districts.
      “One-family dwelling 1 acre, with a minimum lot width of 200’”
    • Specified — One-family dwellings in the R-1 Residential District.
      “One-family dwelling 1 acre, with a minimum lot width of 200’”
    • Specified — Single-family dwellings in the R-R Rural-Residential District.
      “Single-family dwelling 3 acres, with minimum lot width of 200’”
    • Specified — The second dwelling on a farmstead in the A-1 Agricultural-Residential District.
      “Farm Dwelling plus one other dwelling per farmstead** Second dwelling must be on a minimum of 1 acre”
  • SetbacksSpecified

    Yard and setback standards for permitted uses in unincorporated Marion County land-use districts.

    • R-1 one-family dwellings require front 80 feet, side 30 feet, and rear 40 feet.
    • R-R single-family dwellings require front 80 feet, side 50 feet, and rear 80 feet.
    • Where R-R abuts agricultural, commercial, or industrial land use, the common-border setback is 150 feet.
    • Yard distances are measured from property or right-of-way lines as stated in the Order.

    R-1 front setback: 80 feet · R-1 side setback: 30 feet · R-1 rear setback: 40 feet · R-R front setback: 80 feet · R-R side setback: 50 feet · R-R rear setback: 80 feet

    “Where R-R abuts a different land use (or zoning classification: agricultural, commercial, industrial), the minimum setback from the common border shall be 150’.”
    One more reviewed finding on this topic
    • Specified — Buildings and listed uses in unincorporated Marion County zoning districts.
      “One-family dwelling 1 acre, with a minimum lot width of 200’ Front: 80' * Side: 30' * Rear: 40' *”
  • Living in an RVLimited

    Recreational-vehicle parks in the county C-4 Mobile Home Commercial District.

    • The C-4 district is designed for temporary and permanent housing in a mobile-home and/or recreational-vehicle park.
    • The reviewed Order does not establish a general individual-RV occupancy rule outside such parks.
    “temporary and permanent housing in a mobile home and/or recreational vehicle park.”
  • Manufactured homesLimited

    Single mobile or manufactured homes and manufactured-home parks in county land-use districts.

    • Single mobile homes are listed as permitted uses in R-1 and R-R districts subject to district lot-size, frontage, and yard standards.
    • Manufactured-home parks established after the effective date of the Order must satisfy park acreage, density, lot-size, setback, spacing, parking, access, health, engineering, and wastewater requirements.
    • The Order uses the terms trailer, mobile home, and manufactured housing.

    R-1 single mobile-home minimum lot area: >= 1 acre (minimum 150-foot frontage also required) · R-R single mobile-home minimum lot area: >= 3 acres (minimum 200-foot lot width also required) · manufactured-home park minimum area: >= 10 acres (parks established after the effective date of the Order)

    “All manufactured home parks (also known as trailer or mobile home parks) established after the effective date of this Order shall comply with the following requirements:”
    2 more reviewed findings on this topic
    • Allowed (with conditions) — A single mobile home as a permitted use in the R-1 Residential District or R-R Rural-Residential District.
      “Single mobile home 1 acre, with minimum of 150' frontage”
    • Limited — Manufactured-home parks, also called trailer or mobile-home parks, in the C-4 Mobile Home Commercial District.
      “All manufactured home parks (also known as trailer or mobile home parks) established after the effective date of this Order shall comply with the following requirements:”
  • Accessory dwellingsLimited

    A-1 Agricultural-Residential District farmsteads in unincorporated Marion County.

    • The A-1 table allows a farm dwelling plus one other dwelling per farmstead.
    • The second dwelling must be on a minimum of one acre.
    • This provision is district-specific and does not establish a countywide accessory-dwelling rule.

    minimum area for second dwelling: >= 1 acre (second dwelling on a farmstead)

    “Farm Dwelling plus one other dwelling per farmstead”
  • Who permits septicMixed (with conditions)

    Onsite wastewater permitting in Marion County, including unincorporated county areas and incorporated areas.

    • Marion County Health Department administers ordinance-based permitting for Marion County.
    • The DHSS page states that some incorporated cities may not fall under the local permitting authority and that the process defers back to DHSS.
    • DNR regulates specified non-domestic, surface-discharge, and greater-than-3,000-gallons-per-day systems.

    domestic wastewater flow threshold: <= 3000 gallons per day (DNR regulates systems with flows greater than 3,000 gallons per day)

    “permits are required to install on-site wastewater systems from the Marion County Health Department.”
    3 more reviewed findings on this topic
    • County (with conditions) — On-site wastewater permitting for Marion County properties.
      “Building permits are required in our county, and permits are required to install on-site wastewater systems from the Marion County Health Department.”
    • County (with conditions) — On-site wastewater-system permitting in Marion County.
      “permits are required to install on-site wastewater systems from the Marion County Health Department.”
    • County (with conditions) — Permitting for on-site wastewater systems in Marion County.
      “permits are required to install on-site wastewater systems from the Marion County Health Department.”
  • Septic permitRequired

    Installation or repair of most onsite wastewater treatment systems in Marion County.

    • Some single-family residential lots may be exempt from permitting.
    • Marion County has an onsite wastewater ordinance that may impose requirements beyond state minimum standards.
    • Work should not begin until a permit has been issued or an exemption confirmed.
    • Effective August 28, 2026, application fees for on-site sewage disposal system construction, modifications, and repairs were temporarily suspended.
    “A construction permit is required before installing or repairing most onsite wastewater treatment systems (OWTS). Some single family residential lots may be exempt from permitting. The first step of the permitting process is to determine the agency that has permitting authority where the work is being done.”
    2 more reviewed findings on this topic
    • Required — Installation of on-site wastewater systems in Marion County.
      “A construction permit is required before installing or repairing most onsite wastewater treatment systems (OWTS). Some single family residential lots may be exempt from permitting.”
    • Required — Installation of on-site wastewater systems in Marion County.
      “permits are required to install on-site wastewater systems from the Marion County Health Department.”
  • Mandatory utility hookupConditional

    Development in county R-1 and R-R land-use districts.

    • R-1 areas are required to be served by municipal sewer, a sewer district, or a collection system, subject to the stated on-site-wastewater exception.
    • Developments proposed to be served by water or sewer districts must be reviewed by the respective district, which must acknowledge service ability and acceptance.
    “Developments proposed to be served by a water district and/or sewer district shall be reviewed by the respective district(s). Water and/or sewer districts shall acknowledge the ability to provide services to the development and their acceptance of the system.”
    2 more reviewed findings on this topic
    • Conditional — Residential developments in the county R-1 and R-R districts proposed to use water or sewer districts.
      “Developments proposed to be served by a water district and/or sewer district shall be reviewed by the respective district(s). Water and/or sewer districts shall acknowledge the ability to provide services to the development and their acceptance of the system.”
    • Conditional — Development in the county R-1 Residential District and developments proposed to use water or sewer districts.
      “this area will be required to be served by a municipal sewer, sewer district, or collection system.”
  • Agricultural exemptionAvailable

    Farm buildings in Marion County that are prohibited from land-use control by Missouri State Statute.

    • The Land Use Order expressly excludes farm buildings prohibited from land-use control by State Statute.
    • This is an exception from the County Order; it does not establish that every agricultural building is exempt from every other state, health, wastewater, floodplain, or safety requirement.
    “This Order does not pertain to farm buildings prohibited from land use control by State Statute.”
  • Subdividing landRegulated (with conditions)

    Residential development and subdivision activity governed by Marion County land-use and referenced subdivision regulations.

    • The Order states residential land usually must be divided into lots and meet Marion County Subdivision Regulations.
    • The incorporated Appendix A provisions define residential housing development as land divided or proposed to be divided into three or more lots for sale or lease as part of a common promotional plan.
    • State wastewater approval and exemptions may apply under the referenced 10 CSR 20-6.030 provisions.

    residential housing development threshold: >= 3 lots (as part of a common promotional plan)

    “Usually land, in order to be used for residential purposes, will have to be divided into lots and meet the Marion County Subdivision Regulations.”
    One more reviewed finding on this topic
    • Regulated (with conditions) — Residential land division and development in unincorporated Marion County.
      “Usually land, in order to be used for residential purposes, will have to be divided into lots and meet the Marion County Subdivision Regulations.”
  • Building in a floodplainRequired

    Development in Marion County floodplains and floodways.

    • A floodplain development permit/application is required for development in a floodplain.
    • Floodway development requires certification before permit issuance that the development will cause no increase in base, 100-year flood elevations.
    • Residential and non-residential buildings have elevation or floodproofing conditions, and as-built elevation certification by a registered professional is required.
    “The undersigned hereby makes application for a permit to develop in a lloodplain.”
    2 more reviewed findings on this topic
    • Required — Development in a Marion County floodplain or floodway.
      “The undersigned hereby makes application for a permit to develop in a lloodplain. The work to be performed, including flood protection works, is as described below and in attachments hereto.”
    • Limited — Development in the county's FP Flood Plain District and other areas governed by the Marion County Flood Plain Ordinance and Flood Plain Map.
      “FP-Flood Plain District. Refer to the Marion County Flood Plain Ordinance and Marion County Flood Plain Map for further details. These will be found at the Land Use Coordinator’s Office.”
  • Permit feesPublished (with conditions)

    Marion County building-permit fees and the land-use permit fee process.

    • The building permit form states the fee as construction cost multiplied by 0.002.
    • The land-use order states that the Administrative Officer collects the required fee before issuing a permit and that the amount is established by the County Commission.
    • The building permit form identifies the revision/adoption date as August 15, 2011; this is not treated as an effective date.

    building permit fee: 0.002 cost of construction multiplier

    “If use conforms to permitted uses and minimum lot and yard widths, the Administrative Officer collects the required fee and uses permit. [...] The Administrative Officer shall collect the fee before issuing a permit. (To be established by the County Commission.)”
    2 more reviewed findings on this topic
    • Published (with conditions) — Marion County building permit applications.
      “Cost of Building Permit: Cost of Construction x .002”
    • Published (with conditions) — Marion County building permits under the official building-permit application.
      “The Administrative Officer shall collect the fee before issuing a permit. (To be established by the County Commission.)”
  • Permit processPublished (with conditions)

    Building and land-use permit process in unincorporated Marion County.

    • Contact the Administrative Officer.
    • Provide a legal description, property sketch, and proposed-use description.
    • The Administrative Officer checks the Official Land Use District Map.
    • Conforming uses proceed after required fee payment; nonconforming uses may require a County Commission district change or Board of Adjustment modification.
    • The applicant must provide development cost, wastewater permit, or applicable sewer-connection documentation.
    “Personally contact the Administrative Officer. (Appointed by the County Commission.)”
    One more reviewed finding on this topic
    • Published (with conditions) — Land-use permitting for new buildings, additions, and land-use changes in unincorporated Marion County.
      “If use does not conform to minimum lot or yard standards, the applicant may make an application for a modification of the requirements to the Board of Adjustment.”

Missouri rules that apply here

  • Owner-builder exemptionAvailable (with conditions)

    A property owner installing, modifying, or repairing that owner's on-site sewage disposal system.

    • The owner must comply with RSMo 701.025 to 701.059.
    • The statute separately provides that an owner need not obtain a permit or contractor registration merely to clean that owner's on-site sewage disposal system.
    “Nothing in sections 701.053 to 701.055 shall preclude property owners from installing, modifying or repairing their own on-site sewage disposal system”
  • Building code adoptedPartial

    Missouri statewide legal framework for building-code adoption by counties and other communities; the statutes authorize local adoption rather than establishing one uniformly adopted statewide building code.

    • County authority under RSMo 64.170 applies to counties of the first and second classification.
    • A county that had not adopted a building code before August 28, 2001 must obtain voter approval before adopting under RSMo 64.170 to 64.200.
    • The adoption vote is limited to voters in the affected area; a code affecting a county is not voted on by citizens of incorporated territory.
    • A county adopting under RSMo 64.180 must use a current nationally recognized building code edition from calendar year 1999 or later, as amended.
    • A county building ordinance may not conflict with liquefied petroleum gas installation requirements governed by RSMo 323.020.
    • A community may incorporate a code by reference only if it otherwise has legal power to adopt the ordinance.
    • A code incorporated by reference must be filed with the community clerk and available for public inspection for 90 days before adoption.
    • An ordinance adopting a code by reference must state the penalty separately rather than incorporate the penalty by reference.
    • RSMo 67.280 defines community to include any county, fire protection district, or municipality, and municipality to include an incorporated city, town, or village.
    “Because fire and building codes are adopted at the local level in Missouri”
    2 more reviewed findings on this topic
  • InspectionsLimited

    Construction, major modification, or major repair of an on-site sewage disposal system for which RSMo 701.046 requires notice and an application; this is not a general statewide inspection rule for all buildings.

    • The city, county, or department must receive notice and an opportunity to inspect before completion.
    • A registered contractor must notify the authority before 9:00 a.m. on the day before completion; an unregistered person must notify it before 9:00 a.m. on the second day before completion.
    • The system must remain available for a complete inspection under the state standard until 3:00 p.m. on the completion day unless the authority confirms earlier inspection and approval.
    • The system may not be closed or completed if inspection finds it does not meet the state standard; the authority must provide conspicuous notice at inspection and written confirmation of the result, or of no inspection, within three working days of completion.
    “without providing notice and an opportunity for inspection by the city, county or department as provided in this section.”
  • Minimum dwelling sizeDistrict specific (with conditions)

    Potential county zoning controls on the size of residential buildings in unincorporated portions of first-class counties other than first-class counties without a charter form of government.

    • The county commission is authorized to regulate by order in accordance with a comprehensive plan.
    • The statute does not state a statewide minimum dwelling-size measurement.
    • The statute expressly excludes incorporated portions of counties and identifies additional agricultural, rice-farming, flood-irrigation, farm-structure, and underground-mining exclusions.
    “except in counties of the first class not having a charter form of government [...] in the unincorporated portions of the county [...] size of buildings”
  • Lot coverageSpecified

    Percentage of lots that may be occupied in unincorporated portions of second- and third-class counties with county zoning; lot coverage left to such counties

    • Power exists only for counties to which sections 64.510 to 64.690 apply under section 64.510
    • Exercised only after approval by vote of the people as provided in section 64.530
    • Must be done by order of record and in accordance with a comprehensive plan
    • Applies only to unincorporated portions of the county
    • Does not apply to crops, livestock, orchards, forestry, or farm buildings used for such purposes outside the flood hazard area map area
    • Existing lawful uses protected; ordinances adopted before March 4, 1991 unaffected
    “the percentage of lots that may be occupied”
  • Camping on your landLimited

    Developments where land is sold or leased for camping in recreational vehicles (recreational developments) under the state wastewater rule 10 CSR 20-6.030; this is a wastewater-disposal rule, not a zoning rule on camping generally

    • Applies only when land is sold or leased for the purpose of camping in recreational vehicles.
    • To qualify as a recreational development, restrictive covenants must prohibit continuous year-round living on the lot, and no cabins or other structures that could be used for year-round residential purposes are allowed.
    • Minimum lot size of 20,000 sq ft applies where individual on-site wastewater treatment facilities are used; no reduction from the minimum lot size determined by the geohydrologic evaluation, though a one-half reduction as indicated by the soils report may be allowed.
    • Where sewage dump stations provide collection and treatment, they count as centralized collection and treatment.
    • The developer must submit a copy of the restrictive covenants with any plans for dump stations or centralized systems.
    • Any residential housing development required to obtain department approval must get written approval before sale or lease of any lot or start of construction.
    • Rule text says it does not preclude local, municipal, county or other lawful authority from adopting equal or more stringent subdivision, sewer or on-site system regulations.
    • Rule was last amended with an effective date of Jan. 30, 2025.
    • The state rule does not itself regulate temporary camping on private land outside such developments; that is left to local zoning.

    minimum lot size, recreational development with individual on-site wastewater treatment: >= 20000 square feet (one-half reduction per soils report may be allowed; no reduction from geohydrologic evaluation minimum)

    “a development is considered recreational when land is sold or leased for the purpose of camping in recreational vehicles. in order to be considered a recreational development, restrictive covenants must prohibit continuous year-round living on the lot and no cabins or other structures will be allowed that could be used for year-round residential purposes.”
  • Septic inspectionLimited

    Inspection or evaluation of existing onsite wastewater systems in connection with Missouri real-estate transfers.

    • Local public health agencies generally no longer inspect existing systems for real-estate transfers.
    • A private licensed inspector may perform an inspection or evaluation.
    • A lender, buyer, or other transaction participant may require an assessment.
    • Some local standards may be more stringent than state regulations.
    • Inspections and evaluations are distinct; an inspection includes a hydraulic test, while an evaluation does not.
    “For the most part, local public health agencies no longer inspect existing systems related to real estate transfer. The help of a licensed inspector can be obtained to check the condition of the system.”
    One more reviewed finding on this topic
    • Limited — Inspections of existing onsite sewage systems in connection with property sales statewide in Missouri.
      “Missouri Department of Health and Senior Services' (DHSS) rules governing onsite sewage systems cover minimum construction requirements, system inspections at the time of property sales, and requirements for percolation testers and soil evaluators.”
  • Off-grid sanitationLimited

    Off-grid domestic wastewater treatment using onsite wastewater treatment systems where central sewer service is unavailable.

    • Onsite systems treat and dispose of domestic sewage on the property where generated.
    • A construction permit is generally required, including for residential property less than three acres, subject to county-specific exceptions.
    • Wastewater may not be discharged into a road ditch or onto the ground.
    • Local permitting authorities may impose additional requirements.

    residential lot threshold: < 3 acres (The exemption does not apply in some counties.)

    “Onsite wastewater treatment systems are sometimes referred to as "septic systems." These systems treat and dispose of domestic sewage on the property where it is generated.”
    One more reviewed finding on this topic
    • Allowed (with conditions) — Use of onsite wastewater treatment systems as off-grid sanitation where central sewer service is unavailable in Missouri.
      “In Missouri, where central sewer service is not available, homeowners and small business owners use various types of onsite wastewater treatment systems (OWTS).”
  • Well permitLimited

    Construction or alteration of a public well serving a Missouri public water system.

    • Public water systems must receive written approval from the Missouri Department of Natural Resources Public Drinking Water Branch before constructing or altering a public well.
    • The requirement does not apply when the system meets the charitable-and-benevolent-organization exemptions in section 640.116, RSMo.
    • Anyone proposing to install a public well must contact the department’s regional office for a well-site survey.
    • The survey addresses minimum isolation or setback distances from known or potential contaminant sources, including septic tanks, sanitary sewer lines, and landfills.
    • Before applying for construction authorization, the public water system must obtain an estimated casing-depth letter from the Missouri Geological Survey Water Resources Center.
    • There is no fee for the well-site-survey and estimated-casing-depth-letter services.
    • Failure to obtain construction authorization may result in approval delays and possibly require the owner to properly plug the well and drill a new one according to 10 CSR 60-3.

    public water system threshold: at least 15 service connections or regularly serves an average of at least 25 individuals daily, at least 60 days per calendar year

    “Public water systems must receive written approval from the PDWB before constructing or altering a public well”
    3 more reviewed findings on this topic
    • Required — Water-well construction or repair in Marion County under Missouri statewide rules.
      “A non-restricted water well installation permit is required to construct or repair a water well in Missouri.”
    • Required — A person or contractor conducting regulated work to drill, construct, repair, reconstruct, plug, or install pumps or pumping equipment in a water well, heat-pump well, monitoring well, or related well in Missouri.
      “A non-restricted permit is required to drill, construct, repair, reconstruct, plug, or install pumps or pumping equipment in a well.”
    • Limited — Construction or repair of water wells, installation or replacement of pumps, and associated plumbing and electrical work in Missouri.
      “A non-restricted water well installation permit is required to construct or repair a water well in Missouri.”
  • Driveway accessRequired

    Construction or modification of driveways within MoDOT right-of-way statewide.

    • A permit is required for construction of driveways and modifications to existing driveways on MoDOT right-of-way.
    • An initial online request must be submitted for each planned listed activity.
    • Engineered plans, traffic studies, hydraulic analysis, traffic-control plans, surety deposits, or performance bonds may be required depending on the work.
    • The rule does not establish a permit requirement for driveways outside MoDOT right-of-way.
    “We require you to obtain a permit to work on MoDOT's Right of Way for: Construction of driveways”
  • county zoning authorityLimited

    Missouri county zoning authority over unincorporated land.

    • RSMo § 64.850 applies to counties of the first class without a charter and counties of the second, third, or fourth class.
    • RSMo § 64.620 applies to counties of the second or third class to which §§ 64.510–64.690 apply.
    • Adoption under §§ 64.510–64.690 requires approval by vote of the people under § 64.530.
    • The authority applies in unincorporated portions and not incorporated portions.
    • The regulations must be in accordance with a comprehensive plan.
    • Under § 64.090, the zoning power does not apply to raising crops, livestock, orchards, or forestry; seasonal or temporary rice-farming or flood-irrigation impoundments; specified farm structures outside mapped flood-hazard areas; or underground mining entered through shafts outside mapped flood-hazard areas.
    • Existing lawful uses and specified public-utility services are protected under the cited statutory schemes.
    “the county commission of any county of the first class not having a charter form of government, or of any county of the second, third or fourth class may, after approval by vote of the people as provided in section 64.845, regulate and restrict, by order of record, in the unincorporated portions of the county, the height, number of stories, and size of buildings, the percentage of lots that may be occupied, the size of yards, courts and other open spaces, the density of population, the location and use of buildings, structures and land for trade, industry, residence or other purposes.”
    2 more reviewed findings on this topic
  • county building authorityLimited

    County authority to regulate residential construction and issue building permits in unincorporated areas of Missouri.

    • The authority under sections 64.170 to 64.200 applies to counties of the first and second classification.
    • A county that had not adopted a building code before August 28, 2001, must obtain voter approval before adopting one under those sections.
    • Only voters in the area affected by the proposed code may vote; incorporated-territory citizens cannot vote on a code affecting a county.
    • The county commission must hold at least three public hearings and provide the statutory newspaper publication and county posting notices before adoption.
    • Regulations adopted under section 64.180 apply to unincorporated territory, except as otherwise provided.
    • Adopted or amended codes after August 28, 2001, must use a current, calendar year 1999 or later edition of a nationally recognized building code, as amended.
    • A county building ordinance may not conflict with liquefied petroleum gas installations governed by section 323.020.

    public hearings before adoption: >= 3 hearings minimum (Section 64.180(3)) · newspaper notice: >= 15 days (Notice of hearing time and place must be published in at least two newspapers having general circulation within the county) · posted notice: >= 15 days (Notice must be posted in four conspicuous places in the county) · minimum nationally recognized building-code edition: >= calendar year 1999 edition year (Applies after August 28, 2001, under section 64.180)

    “The regulations adopted shall be applicable to the unincorporated territory of the county, except as otherwise provided herein”
    2 more reviewed findings on this topic
    • Limited — County regulation of construction and issuance of building permits for buildings, including residential construction, in Missouri counties, with the practical focus on county-controlled areas outside incorporated territory.
      “the county commission in all counties of the first and second classification [...] is for this purpose empowered [...] to adopt [...] regulations to control the construction”
    • Limited — Missouri counties' authority to require permits and regulate residential construction in unincorporated areas.
      “Before the adoption of such code of regulations, the county commission shall hold at least three public hearings thereon”

Still unanswered

We looked and could not find an official answer yet. Silence is not permission — ask the county directly.

  • Certificate of occupancy — Certificate-of-occupancy requirements for county-regulated construction.
  • Building height — Building-height limits in unincorporated Marion County.
  • Tiny homes — Tiny home occupancy in unincorporated Marion County
  • Short-term rentals — Short-term rental use in Marion County.

Each answer was extracted from an official source and independently re-checked against that source by a second reviewer. That is an evidence check, not legal advice. Rules change; confirm with the authority before you buy or build.

Living off-grid in Marion County, Missouri

Is Marion County a good place to live off-grid or homestead?

Marion County scores 66/100 on the Bolthole Index, a strong county profile. Its strengths: manageable long-term carry cost and workable self-sufficiency basics (39.7″/yr rainfall).

How much does land cost in Marion County, Missouri?

Land in Marion County runs about $6,203 per acre, based on the latest county data.

What is the water situation in Marion County?

Marion County gets about 39.7" of rain a year, with severe drought in roughly 4.4% of years.

How remote is Marion County?

A representative private-land location has about 67,192 people within a 30-minute drive and 1,207,556 within two hours. The road-network catchments count population across county lines and clusters of smaller cities; straight-line radius values remain available as a comparison.

How Marion compares in Missouri

Compare side-by-side →See all 115 Missouri counties ranked →