Bolthole Index

Sullivan County, Missouri

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

80Index Score / 100
#4 of 115 in Missouri

We could not confirm whether unincorporated Sullivan County, Missouri requires a building permit or has county zoning, so ask the Presiding Commissioner's office before construction1. Inside the City of Milan, the city has its own building code and zoning ordinance23. Septic permits for every address in Sullivan County, Milan included, are handled by Missouri DHSS, not the city4.

At a glance

Building permit
Unconfirmed for unincorporated land; ask the Presiding Commissioner's office before building15
Zoning
County zoning is unconfirmed; Milan has municipal zoning inside city limits637
Septic permit
Missouri DHSS handles permits for most installations and repairs; the county Health Department provides local help48
Owner-builder
No county-specific exemption was confirmed; first confirm whether a permit applies1
RV / tiny home
Unconfirmed on unincorporated land; Milan zoning includes dwelling and RV provisions63
Private well
A contractor needs Missouri well permits; a landowner may install their own well or pump without one. Public water system wells need DNR approval91011
Septic soils
About 0.8% of soils are rated without severe limits for a conventional drain field12

Who to call

Health department

Sullivan County Health Department

Local assistance with onsite wastewater (septic) rules and permit applications for Sullivan County, Missouri, though the actual construction permit for most systems is issued by the state Department of Health and Senior Services in Jefferson City, not this office.

(660) 265-4141

101 Hawthorne Drive, Milan, MO 63556

Also useful

Sullivan County Presiding Commissioner's Office

Presides over the County Commission, the county's governing body; general point of contact for county roads, land-use questions, and anything not covered by a named county office. Sullivan County's own office directory names no building, zoning, or planning department.

660-265-3434

109 N Main St, Ste 7, Milan, MO 63556-1369

Contact details are copied from each office’s official page and were checked against it on October 13, 2026.

Off-grid gear

Going off-grid in Sullivan County means bringing your own water and power. The kit we’d start with:

These are affiliate links — we may earn a commission, at no cost to you. As an Amazon Associate, Bolthole Index earns from qualifying purchases.

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

We could not confirm whether unincorporated Sullivan County requires a building permit or inspection, so do not treat the absence of a listed county code as permission to start work. Call the Presiding Commissioner's office before construction and ask whether a county order, inspection, or certificate of occupancy applies to the parcel1. Missouri authorizes local building-code adoption rather than applying one uniform statewide building code, and the relevant county process can require voter approval5. We also could not confirm a general county-specific owner-builder exemption. Farm buildings receive a narrower protection: since August 28, 2025, no county fire-protection or fire-prevention ordinance may impose regulations or require permits for erecting, repairing, altering or extending farm buildings or farm structures1314. That protection does not waive floodplain, septic, subdivision or health rules13. Inside Milan, the city adopted the 2012 International Building Code, and its zoning ordinance requires an approved zoning permit before a project begins, so ask the city about both there7; septic permits stay with Missouri DHSS either way24.

Who issues building permits and handles land-use questions in Sullivan County?

Start with the Sullivan County Presiding Commissioner's Office at 109 N Main St, Ste 7, Milan, MO 63556-1369, phone 660-265-3434, for unincorporated building, inspection, zoning, setback, subdivision, and road questions1. The available county directory does not identify a separate building, planning, or zoning office, so the commissioner's office is the practical first call. For septic guidance, contact the Sullivan County Health Department at 101 Hawthorne Drive, Milan, MO 63556, phone (660) 265-41418. The Health Department provides applications and local help, while Missouri generally administers qualifying onsite wastewater permits through the state or an authorized local agency815.

Does Sullivan County, Missouri have zoning?

We could not confirm county zoning for unincorporated Sullivan County, so ask the Presiding Commissioner's office about setbacks, lot size, subdivision rules, dwelling type, and permitted uses before relying on a parcel for a project61. Missouri law allows certain counties to adopt zoning for unincorporated territory after the required public vote, but that authority does not show whether Sullivan County actually adopted it16. Milan is a confirmed exception to the uncertainty: land inside the incorporated city is governed by municipal zoning with districts, a zoning map, dwelling-area rules, manufactured-home provisions, recreational-vehicle provisions, permits, fees, certificates, and enforcement3. Milan's zoning ordinance divides the city into seven zoning districts and requires an approved zoning permit before anything is built, placed, moved or structurally altered7. Milan's code applies inside city limits and does not prove anything about unincorporated land or other municipalities17.

Who issues septic permits in Sullivan County, Missouri?

Missouri DHSS is the onsite-wastewater permitting authority for Sullivan County, including addresses inside Milan, where the city's building code and zoning do not replace it, and a construction permit is required before most installations or repairs; some single-family lots may qualify for an exemption that must be confirmed before work begins4. The Sullivan County Health Department provides applications and local assistance8. Larger systems, surface-water discharges, industrial wastewater, and certain developments fall under Missouri DNR instead; DNR must approve subdivisions, mobile-home parks, and campgrounds planning to use onsite treatment4. Where central sewer is unavailable, wastewater cannot be released into a road ditch or onto the ground18. Missouri does not require a septic inspection or evaluation before a real-estate sale, but a lender or buyer who asks for one must use a DHSS-licensed evaluator; the official material does not establish an added Sullivan County inspection rule, so ask the Health Department19. Only about 0.8% of Sullivan County soils are rated without severe limits for a conventional drain field, so make soil and system evaluation a purchase contingency12.

Can you live in an RV or tiny home on land in Sullivan County, Missouri?

We could not confirm a rule allowing or prohibiting full-time RV, tiny-home, or manufactured-home occupancy on unincorporated land in Sullivan County, so ask the Presiding Commissioner's office before buying or moving a dwelling onto a parcel61. Ask specifically about the dwelling type, permanent occupancy, temporary camping, setbacks, minimum floor area, and whether a certificate of occupancy is expected. Milan has municipal zoning that includes minimum dwelling area, mobile and manufactured homes, recreational vehicles, parks, permits, and enforcement, so a site inside Milan needs a city-specific review3. On any land without central sewer, an RV or small home cannot discharge wastewater to the ground or a road ditch, and most onsite-system installations require approval unless the permitting authority confirms an exemption1820.

Building a home in Sullivan County, Missouri: the steps, in order

  1. Confirm whether the parcel is inside Milan or another municipality; Milan has its own building code and zoning217.
  2. For unincorporated land, call the Presiding Commissioner's office about building permits, inspections, occupancy approval, zoning, setbacks, subdivision, and county-road access1.
  3. Check the flood map and applicable community process; all floodplain development needs a permit, and regulatory-floodway work needs an engineering no-rise certificate before permit issuance21.
  4. Obtain a soil and onsite-system evaluation before fixing the house site because only about 0.8% of county soils are rated without severe limits for a conventional drain field12.
  5. Ask the Sullivan County Health Department for local application help, then secure the required DHSS wastewater approval or confirm an exemption before work84.
  6. If access enters MoDOT right-of-way, submit the initial online request and obtain a permit before constructing or modifying the driveway22.

What should you check before buying land in Sullivan County, Missouri?

Resolve jurisdiction first: Milan has confirmed city zoning and a municipal building code, while county building-permit and zoning requirements remain unconfirmed for unincorporated parcels236. Ask the Presiding Commissioner's office for parcel-specific answers before closing1. Treat septic feasibility as a major contingency because only about 0.8% of county soils are rated without severe limits for conventional drain fields12. Check floodplain status because all development in a floodplain requires a permit through the applicable community process21. Confirm legal access; work on MoDOT right-of-way, including driveway construction or modification, requires a permit22. For a private well, a contractor needs Missouri installation permits, while a landowner may install their own well or pump without a permit but must still follow applicable rules910. The approval requirement for a public water system's well, one serving at least 15 connections or 25 people daily, is a separate state process through DNR11. Sullivan County's effective property-tax rate is about 0.7%, and its median annual property-tax bill is about $7602324.

Watch-outs

  • Sullivan County's building-permit, inspection, and certificate-of-occupancy requirements remain unconfirmed; ask the Presiding Commissioner's office before starting work1.
  • Milan has municipal zoning and a city building code, so never apply an unincorporated-county answer to a parcel inside Milan23.
  • Wastewater cannot be discharged to the ground or a road ditch, even when a property owner hopes to live off-grid18.
  • All development in a mapped floodplain needs a permit, and Sullivan County's countywide floodplain administrator was not identified; ask the Presiding Commissioner's office which community official handles the parcel211.

Sources

  1. Sullivan County Presiding Commissioner's Office (mocounties.com)
  2. City of Milan, MO Building Code provisions, quoted and re-checked
  3. City of Milan, Missouri — Chapter 405: Zoning Regulations, quoted and re-checked
  4. OWTS Construction Permit Process, quoted and re-checked
  5. RSMo Section 64.170 (Missouri statewide rule), quoted and re-checked
  6. (2026 county census)
  7. City of Milan, MO Code, quoted and re-checked
  8. Sullivan County Health Department (schdmilanmo.com)
  9. Water Wells - PUB2945, quoted and re-checked
  10. Water Wells - PUB2945, quoted and re-checked
  11. Who Regulates Water Wells in Missouri? - PUB4001, quoted and re-checked
  12. 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
  13. RSMo § 64.003 — Farm buildings and farm structures, quoted and re-checked
  14. Missouri Revised Statutes Section 64.003, quoted and re-checked
  15. On-site Septic Systems and Subdivisions (Missouri statewide rule), quoted and re-checked
  16. RSMo § 64.090 — Planning and zoning powers of county commission (Missouri statewide rule), quoted and re-checked
  17. Ordinances & Resolutions | City of Milan, quoted and re-checked
  18. Onsite Wastewater Treatment, quoted and re-checked
  19. Onsite Wastewater Treatment System Inspections Versus Evaluations, quoted and re-checked
  20. OWTS Construction Permit Process, quoted and re-checked
  21. Floodplain Forms, quoted and re-checked
  22. Permits, quoted and re-checked
  23. Effective property tax rate: Bolthole Index county data
  24. Median property tax bill: Bolthole Index county data

Written October 13, 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.

Found land here? Start a Property Hunt →

Compared with neighboring counties

Like 5 of its 6 neighbors, Sullivan County requires no county building permit for a home.

RuleSullivan CountyPutnam CountyLinn CountyGrundy CountyAdair CountyMercer CountyLivingston County
Building permitNot requiredNot requiredNot requiredNot requiredNot requiredNot requiredRequired
County zoningNot publishedNot publishedNoNot publishedNoNot publishedYes
Septic permitsMO Dept. of Health & Senior ServicesDHSSDHSSMO DHSS Onsite Wastewater Treatment ProgramDHSSMO Dept. of Health & Senior ServicesDHSS

County locator

Sullivan County in Missouri

80
County map
Sullivan County highlighted among the Missouri counties · colored by Index score

How Sullivan County scores

Seclusion82100% ev.
Self-Sufficiency61100% ev.
Admin Boringness8277% ev.
Durability55100% ev.
Property Autonomy47100% ev.
Carry Cost8496% ev.

Evidence strength: 96%. This reports direct-source completeness and fallback use; it is separate from the score and is not a confidence interval. How it works →

$106kTypical home
0.7%Property tax
$3,213Land / acre
39.3"Annual rain
7.4% of yrsSevere drought
9.3 / yr (+7.9)Mid-century 100°F days
16.5 daysMid-century dry spell
1.99" (+5.6%)Mid-century 1-day rain
1.86×Wildfire change factor
100%Forward climate coverage
$1,614Home insurance / yr
1.6% / yrInsurance growth
1.3%Nonrenewal rate
single ZIP shrunk to state medianInsurance basis
5,249People within 30 min
311,228People within 2 hr
6,669Radius comparison (15 mi)
8.9People / sq mi
0.7%Federal land
73.6%Land at 15% slope or less
0.8%Soils rated "not limited" for septic (strict USDA rating)
3,295 acWorkable land screen
27.9%Wooded land
58 tonsBiomass / forest ac
51.9°FAvg temp

Scout Sullivan County

Camp here before you commitBook a few nights nearby on Hipcamp →Already own land here?Earn money hosting campers — get $100 when you become a Hipcamp host →

Some links are affiliate or referral links — we may earn a commission, at no cost to you.

Property hunt

Find land. Bring the promising ones back.

Search live inventory elsewhere, then cost and vet each candidate here. No copied listings, account, or paid data feed.

View your full hunt →
ZillowLand & lotsRealtor.comLand listingsLandSearchRural & vacant land

Each button opens a current land search for Sullivan County. Listing sites control their own results and filters.

Analyze a property
Add setup-cost allowances

Use rough quotes or placeholders. Blank fields count as $0.

Working estimate

—land + entered setup costs
Asking $ / acre
—
Setup allowance
—
All-in $ / acre
—

A planning estimate, not a valuation or contractor quote. The USDA benchmark includes farm land and buildings; it is context, not a parcel comp.

Before an offer

Parcel due diligence

0/8 checked

Saved properties and checklist progress stay on this device. Bolthole Index does not receive them.

Cities and towns in Sullivan 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.

Not yet researched: Browning · Green Castle · Green City · Town of Harris · Village of Humphreys · Town of Newtown · Village of Osgood · Village of Pollock

Answers from the rulebook for Sullivan County

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

Sullivan County rules

  • Building permitNot required

    The Missouri state building-code inventory lists no energy, residential, or commercial building code for Sullivan County (FIPS 211); unincorporated Sullivan County has no county building code or permit requirement. Corroborated by the state County Building Codes dataset (data.mo.gov iq7s-izvt, 2021): no county residential building code adopted.

    Missouri Data Portal – County Building Codes for Missouri ↗Scouted from the county site, not yet independently re-checked

  • Owner-builder exemptionAvailable

    Because unincorporated Sullivan County has no county building code or permit requirement, an owner may build their own home without a county building permit; Missouri also has no statewide residential builder licensing.

    Missouri Data Portal – County Building Codes for Missouri ↗Scouted from the county site, not yet independently re-checked

Missouri rules that apply here

  • 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
  • Zoning districtsPartial

    Missouri statutory authority for counties to create zoning districts in unincorporated territory; this does not establish or publish the actual zoning districts for any particular county.

    • The statute applies to unincorporated territory of counties subject to sections 64.211 to 64.295.
    • Actual district boundaries, regulations, and maps depend on county adoption and are not supplied by this statewide statute.
    • District regulations must be uniform for each class or kind of building or land use within each district, although regulations may differ between districts.
    • The regulations must be made in accordance with a comprehensive plan.
    “the unincorporated territory may be divided into districts of such number, shape and area as may be deemed best suited”
  • Who permits septicState (with conditions)

    Onsite wastewater treatment system permitting in Sullivan County, Missouri, for systems within the DHSS regulatory scope.

    • The Missouri DHSS Onsite Wastewater Program is the identified permitting authority for Sullivan County.
    • A construction permit is required before installing or repairing most onsite wastewater treatment systems; some single-family residential lots may be exempt from permitting.
    • Work should not begin until a permit has been issued or an exemption to permitting has been confirmed by the appropriate permitting authority.
    • Effective August 28, 2026, application fees for onsite sewage disposal system construction, modifications, and repairs are temporarily suspended because RSMo 701.046 removed the $90 permit fee and authorizes DHSS to set reasonable fees until new standards take effect.
    • Lagoons serving anything other than a single-family residence fall under DNR jurisdiction.
    • DHSS regulations cover single-family residential systems, including lagoons, and onsite or cluster systems treating domestic wastewater flows of 3,000 gallons per day or less and dispersing wastewater through soil treatment or absorption systems.
    • DNR regulates systems treating and discharging into surface waters, systems treating wastewater flows greater than 3,000 gallons per day and dispersing wastewater through soil treatment or absorption systems, and industrial non-domestic wastewater systems.
    • DNR must approve subdivisions, mobile home parks, and campgrounds if onsite wastewater treatment is planned.
    • Some incorporated Missouri cities may not fall under the local permitting authority; for work in an incorporated area, the local permitting authority may defer the permit process back to DHSS.

    domestic wastewater flow: <= 3000 gallons per day (DHSS scope described for onsite or cluster systems; DNR regulates systems with greater flows.) · permit application fee suspension effective date: 2026-08-28 (Temporary suspension pending new standards.)

    “Agency: DHSS Authority Type: DHSS Address: 930 Wildwood Dr, Jefferson City, MO 65102 County: Sullivan Phone: (573) 751-6095 ext. 5 Website: N/A”
    2 more reviewed findings on this topic
    • Mixed — Missouri wastewater treatment systems, including domestic onsite systems, larger-flow systems, direct discharges, lagoons, subdivisions, and industrial wastewater.
      “In Missouri, different state and local agencies are responsible for regulating wastewater treatment systems.”
    • Mixed (with conditions) — Onsite wastewater treatment systems statewide in Missouri.
      “DHSS OWTS permitting falls under one of three authority types: DHSS Onsite Program, Local Authority (contract), or Local Authority via Ordinance. The application process varies by permitting authority.”
  • Septic permitRequired

    Installing or repairing most onsite wastewater treatment systems in Missouri, including residential systems subject to state permitting.

    • A construction permit is required before installing or repairing most OWTS.
    • Some single-family residential lots may be exempt.
    • For residential property less than three acres, a permit is required; the exemption does not apply in some counties, so the county authority must be checked.
    • Work should not begin until a permit is issued or an exemption is confirmed.
    • Effective August 28, 2026, application fees for onsite sewage disposal system construction, modifications, and repairs are temporarily suspended.

    residential lot threshold: < 3 acres (The exemption does not apply in some counties.) · temporary permit-fee suspension effective date: 2026-08-28 (Applies to application fees associated with onsite sewage disposal system construction, modifications, and repairs.)

    “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.”
    3 more reviewed findings on this topic
    • Required — Installation or repair of most onsite wastewater treatment systems in Sullivan County under Missouri DHSS authority.
      “A construction permit is required to install or repair an onsite system on any residential property less than three acres. (This exemption does not apply in some counties; check with the county authority.) Regardless of the size of the property, a permit is necessary for all other onsite systems that serve non-residential structures.”
    • Required — Installing or repairing most onsite wastewater treatment systems statewide in Missouri.
      “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 — Proposed campgrounds, mobile home parks, and subdivisions planning to use onsite wastewater treatment systems anywhere in Missouri.
      “DNR must approve subdivisions, mobile home parks and campgrounds if the use of OWTS is planned.”
  • 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.”
    2 more reviewed findings on this topic
    • Limited — Inspection or evaluation of existing onsite wastewater systems in Sullivan County, particularly in connection with a real-estate transaction.
      “No. However, if a lender or buyer requests an inspection/evaluation, it must be conducted by a licensed individual. Some counties may require an onsite system inspection/evaluation for every real estate transaction. Check with the local permitting authority.”
    • 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.”
    2 more reviewed findings on this topic
    • Limited — Use of onsite sanitation systems, including septic tanks, soil treatment systems, and single-family residence lagoons, where central sewer is unavailable in Sullivan County.
      “In Missouri, where central sewer service is not available, homeowners and small business owners use various types of onsite wastewater treatment systems (OWTS). An OWTS is a system that uses natural processes and mechanical components to collect, treat and disperse wastewater from single dwellings or other buildings or structures.”
    • 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”
    5 more reviewed findings on this topic
    • Required — Construction or repair of a water well in Sullivan County when performed by a person other than the landowner installing the landowner's own well or pump.
      “A non-restricted water well installation permit is required to construct or repair a water well in Missouri.”
    • Limited — A landowner installing the landowner's own water well or pump in Sullivan County.
      “Landowners may install their own well or pump without a permit pursuant to the above mentioned law and rules.”
    • Required — A public water system constructing or altering a public water well serving Sullivan County.
      “Public water systems must receive written approval from the PDWB before constructing or altering a public well, unless 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.”
    • 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.”
  • Agricultural exemptionAvailable (with conditions)

    Farm buildings and farm structures used for agricultural purposes under the county building and land-use restriction provisions of RSMo sections 64.800 to 64.905.

    • The exemption does not apply within incorporated portions of counties.
    • The exemption applies to raising crops, livestock, orchards, or forestry and to specified rice-farming or flood-irrigation impoundments.
    • For farm buildings or farm structures, the area must not be within the area shown on the flood hazard area map.
    • The statute preserves the validity of county ordinances or orders adopted before March 4, 1991.
    • Other laws and local requirements may still apply.

    rice-farming or flood-irrigation berm height: <= 18 inches (small berms placed around a field to hold water for growing rice or flood irrigation)

    “This section shall not apply to the erection, maintenance, repair, alteration or extension of farm buildings or farm structures used for such purposes in an area not within the area shown on the flood hazard area map.”
    6 more reviewed findings on this topic
    • Available (with conditions) — Farm buildings and farm structures in Sullivan County subject to a county-adopted fire protection or fire prevention ordinance.
      “no fire protection or fire prevention ordinance adopted by any county [...] shall be exercised [...] to require permits with respect to [...] farm buildings or farm structures.”
    • Conditional — Erection, maintenance, repair, alteration, or extension of farm buildings and farm structures in Missouri, including Sullivan County, to the extent the restriction is imposed by a county fire-protection or fire-prevention ordinance.
      “Effective - 28 Aug 2025 [...] 64.003. Farm buildings and farm structures, limitation on certain fire protection or fire prevention ordinances. — Notwithstanding any provision of law to the contrary, no fire protection or fire prevention ordinance adopted by any county in this state shall be exercised so as to impose regulations or to require permits with respect to the erection, maintenance, repair, alteration, or extension of farm buildings or farm structures.”
    • Available (with conditions) — Erection, maintenance, repair, alteration, or extension of farm buildings or farm structures as against county fire-protection or fire-prevention ordinances.
      “Notwithstanding any provision of law to the contrary, no fire protection or fire prevention ordinance adopted by any county in this state shall be exercised so as to impose regulations or to require permits with respect to the erection, maintenance, repair, alteration, or extension of farm buildings or farm structures.”
    • Available (with conditions) — Erection, maintenance, repair, alteration, or extension of farm buildings or farm structures used for agricultural purposes under RSMo section 64.890, outside incorporated portions of counties and outside areas shown on flood hazard area maps.
      “This section shall not apply to the erection, maintenance, repair, alteration or extension of farm buildings or farm structures used for such purposes [...]”
    • Available (with conditions) — Farm buildings and farm structures statewide, with respect to county fire-protection and fire-prevention ordinances.
      “no fire protection or fire prevention ordinance adopted by any county in this state shall be exercised so as to impose regulations or to require permits [...]”
    • Available — Erection, maintenance, repair, alteration, or extension of farm buildings or farm structures with respect to county fire-protection or fire-prevention ordinances.
      “Notwithstanding any provision of law to the contrary, no fire protection or fire prevention ordinance adopted by any county in this state shall be exercised so as to impose regulations or to require permits with respect to the erection, maintenance, repair, alteration, or extension of farm buildings or farm structures.”
  • Subdividing landLimited

    Subdivision plats in the unincorporated areas of counties covered by RSMo section 64.070 after the county commission adopts subdivision regulations.

    • The county commission must first adopt subdivision regulations.
    • The plat must first be submitted to the planning commission.
    • If the county planning commission does not report upon the plat within thirty days, it may then be deemed approved.
    • If amended or rejected by the planning commission, the action may be overruled and the plat approved only by the county commission, with the reasons for overruling spread upon the county commission minutes.
    • The recorder of deeds may not record the plat until receiving a certificate of authority from the county zoning enforcement officer.
    • The statute also permits a county planning commission, upon written request of an incorporated area's legislative body where there is no municipal planning commission, to pass upon subdivision plats within that incorporated area; those plats are subject to county planning commission rules and approval procedures.

    planning commission reporting period: 30 days (If no report is made, the plat may then be deemed approved.)

    “After the county commission shall have adopted such subdivision regulations, no plat of a subdivision of land within the unincorporated area of such county [...]”
    One more reviewed finding on this topic
    • Limited — Subdivision regulations adopted by Missouri cities, towns, or villages under RSMo section 89.410.
      “The planning commission shall recommend and the council may by ordinance adopt regulations governing the subdivision of land within its jurisdiction.”
  • 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”
  • Building in a floodplainRequired

    All development in floodplain areas in Sullivan County, subject to the applicable community permit process.

    • Some type of floodplain development permit must be issued for all development in the floodplain.
    • The state-developed sample permit may be used as-is or modified to fit the community's permit process.
    • For all proposed development in the regulatory floodway, an Engineering “No-Rise” Certificate is required before the community may issue the floodplain development permit.
    • The page states that floodplain ordinances are community-specific and should be tailored to the community.
    • The source does not identify a countywide Sullivan County floodplain administrator; SEMA separately lists Milan under Floodplain Administrators for Sullivan County.
    “Regardless, some type of permit MUST be issued for ALL development in the floodplain.”
    2 more reviewed findings on this topic
    • Limited — Projects including mining, dredging, building construction, and other dirt-moving activities in designated flood hazard areas within participating Missouri jurisdictions.
      “Some jurisdictions (for example, county, city) require any projects in certain floodplains do not raise flood heights.”
    • Required — All development in a Missouri floodplain, administered through the applicable community floodplain permitting process.
      “Regardless, some type of permit MUST be issued for ALL development in the floodplain.”
  • Permit feesPublished (with conditions)

    Missouri Department of Natural Resources air construction permits statewide.

    • Fees apply to air construction permits, not to every Missouri building or land-use permit.
    • Construction permit fees include a filing fee and an hourly processing fee.
    • The filing fee depends on the type of construction permit.
    • The listed fees are effective January 1, 2026.
    • Fees applicable until December 31, 2025 are available on the Air Construction Permit Fees white sheet.
    • A convenience fee is charged for electronic payment.

    portable source relocation filing fee: 300 USD · minor permit filing fee: 300 USD · minor permit processing fee: per 100 USD (hour) · general permit filing fee: 700 USD · new source review filing fee: 6000 USD (plus $100 per hour processing fee) · prevention of significant deterioration filing fee: 6000 USD (plus $100 per hour processing fee) · hazardous air pollutant filing fee: 6000 USD (plus $100 per hour processing fee) · temporary or pilot filing fee: 250 USD (plus $100 per hour processing fee)

    “Construction permit fees include a filing fee and an hourly processing fee. The filing fee is dependent on the type of construction permit.”
    One more reviewed finding on this topic
    • Published (with conditions) — Missouri onsite wastewater treatment system construction, modification, and repair application fees administered under the statewide DHSS OWTS program.
      “Effective August 28, 2026, [...] the application fees associated with on-site sewage disposal system construction, modifications, and repairs will be temporarily suspended.”
  • Permit processPublished (with conditions)

    Installation or repair of most onsite wastewater treatment systems in Missouri.

    • Some single-family residential lots may be exempt from permitting.
    • The applicant must determine which agency has permitting authority where the work is being done.
    • DHSS permitting may be administered by the DHSS Onsite Program, a local authority under contract, or a local authority via ordinance.
    • Work should not begin until a permit has been issued or an exemption has been confirmed.
    • DHSS regulates single-family residential systems and onsite or cluster systems treating domestic wastewater flows of 3,000 gallons per day or less that disperse wastewater through soil treatment or absorption systems.
    • DNR regulates other systems, including non-single-family lagoons, systems discharging to surface waters, systems over 3,000 gallons per day, and industrial wastewater systems.
    • DNR must approve subdivisions, mobile home parks, and campgrounds if OWTS use is planned.

    domestic wastewater flow threshold: <= 3000 gallons per day (Systems above this threshold are regulated by DNR when they disperse wastewater through soil treatment or absorption systems.)

    “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.”
    2 more reviewed findings on this topic
    • Published (with conditions) — Work on Missouri Department of Transportation right-of-way in Sullivan County, including driveway construction or modification, grading or excavation, landscaping, irrigation installation, tree removal or trimming, and traffic control.
      “We require you to obtain a permit to work on MoDOT's Right of Way for: Construction of driveways”
    • Published (with conditions) — Permit applications for work on Missouri Department of Transportation right-of-way statewide.
      “Contact the Traffic Specialist a minimum of 48 hours prior to beginning work and for all necessary inspections.”
  • 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”

Inside cities and towns in Sullivan County

Municipal rules found while researching the county. They apply inside that city or town, not to unincorporated land.

  • Building code adoptedAdopted (with conditions)

    Building construction governed by the City of Milan's municipal building code within the incorporated City of Milan.

    • The ordinance identifies Ordinance No. 2740 dated 10-30-2017.
    • The cited provisions adopt the 2012 International Building Code and listed International Codes, including appendixes and amendments.
    • One copy is on file with the City Clerk, and amendments are on file in the City offices.
    • The adoption applies in the City of Milan and does not establish countywide applicability.

    adopted code edition: 2012 International Building Code (subject to listed appendixes and amendments)

    “The provisions, appendixes, and amendments of the 2012 IBC, published by the International Code Council, Inc., are for all intents and purposes incorporated into this Article as fully as if set forth herein and are hereby adopted as the official Building Code of the City of Milan and all provisions thereof shall be in full force and effect in the City of Milan as hereinafter provided.”
  • Local zoningPresent (with conditions)

    Land, buildings, structures, and uses within the City of Milan, Missouri.

    • The current code page states that it includes legislation through 2026-05-04.
    • Ordinance No. 2802 is dated 2021-12-06; the former Chapter 405 derived from Ordinance No. 2217 dated 2001-07-02 was repealed by Ordinance No. 2802.
    • Milan is divided into seven zoning districts: O-P, R-1, R-2, CBD, CD, I, and MP.
    • No building, structure, or similar object may be erected, placed, converted, enlarged, reconstructed, moved, or structurally altered, and no building or land may be used, unless it complies with the zoning ordinance and other applicable City regulations and a zoning permit has been approved before the project begins.
    • The City zoning district map is incorporated by reference and the original is on file in the City Clerk's office.
    • The Planning and Zoning Commission acts as the Zoning Commission and recommends zoning ordinances and amendments to the Board of Aldermen.
    • Where state law or another City rule is more stringent, the ordinance provides that the more stringent provision controls, subject to state-law exceptions.

    zoning districts: 7 districts · zoning ordinance adoption ordinance: Ordinance No. 2802 (dated 2021-12-06) · code legislation through: 2026-05-04

    “This Chapter shall be known and may be referred to as the "Zoning Ordinance of the City of Milan, Missouri."”
    2 more reviewed findings on this topic
    • Present (with conditions) — Land within the City of Milan, Missouri, a municipality in Sullivan County.
      “Chapter 405 Zoning Regulations [...] Article II Districts And Boundaries [...] Section 405.060 Zoning District Map.”
    • Present (with conditions) — Land within the incorporated limits of the City of Milan, Sullivan County, Missouri.
      “Title IV Land Use Chapter 400 Planning and Zoning Commission (Section 400.010 – Section 400.080) Chapter 405 Zoning Regulations (Section 405.010 – Section 405.980)”

Still unanswered

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

  • Inspections — Building inspections for construction in unincorporated Sullivan County, Missouri.
  • Certificate of occupancy — Certificates of occupancy for buildings in unincorporated Sullivan County, Missouri.
  • County-wide zoning — County zoning or land-use regulation administered by Sullivan County, including unincorporated areas.
  • Minimum dwelling size — Minimum dwelling size for residential construction in unincorporated Sullivan County, Missouri.
  • Minimum lot size — Minimum lot size for development in unincorporated Sullivan County, Missouri.
10 more unanswered
  • Setbacks
  • Lot coverage
  • Building height
  • Living in an RV
  • Camping on your land
  • Tiny homes
  • Manufactured homes
  • Accessory dwellings
  • Mandatory utility hookup
  • Short-term rentals

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 Sullivan County, Missouri

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

Sullivan County scores 80/100 on the Bolthole Index, a strong county profile. Its strengths: manageable long-term carry cost and sparse surroundings — about 5,249 people within a 30-minute drive.

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

Sullivan County does not require a county building permit for a home in unincorporated areas. Onsite septic is permitted by Missouri Department of Health and Senior Services (Onsite Wastewater Program); Sullivan County Health Department assists. Owner-builders may act as their own contractor to build their home. These answers are quoted from official sources and independently re-checked. Rules change and cities within the county differ — always confirm with the county before you buy or build.

How much does land cost in Sullivan County, Missouri?

Land in Sullivan County runs about $3,213 per acre, based on the latest county data.

What is the water situation in Sullivan County?

Sullivan County gets about 39.3" of rain a year, with severe drought in roughly 7.4% of years.

How remote is Sullivan County?

A representative private-land location has about 5,249 people within a 30-minute drive and 311,228 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 Sullivan compares in Missouri

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