Bolthole Index

Douglas County, Missouri

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

78Index Score / 100
#12 of 115 in Missouri

Unincorporated Douglas County, Missouri appears not to require a county residential building permit; confirm with the County Commission or County Clerk before construction123. Inside Ava, the city requires residential building permits and sets zoning; Missouri DHSS handles septic permits for Douglas County456. County zoning outside Ava remains unconfirmed7.

At a glance

Building permit
Appears not required for unincorporated land; Ava requires one14
Zoning
Unconfirmed for unincorporated land; Ava sets city zoning75
Septic permit
Missouri DHSS handles Douglas County; residential lots under 3 acres require a permit68
RV living
County rules could not be confirmed; ask the County Commission or County Clerk723
Tiny homes
County occupancy, size and setback rules could not be confirmed7
Owner-builder
An owner may work on their own septic system but must follow state septic law9
Ava lot size
City minimums vary by zoning district and dwelling type10
Septic fees
Application fees are temporarily suspended11

Who to call

Also useful

Douglas County Presiding Commissioner

First contact for unconfirmed county building, zoning, floodplain and county-road requirements

417-683-6080

PO BOX 398 203 SE 2ND AVE AVA MO 65608-0398

Also useful

Douglas County Clerk

County records and general administration; a starting point when no dedicated land-use office is listed

417-683-4714

PO BOX 398 203 SE 2ND AVE AVA MO 65608-0398

Septic permits

Missouri DHSS Onsite Wastewater Treatment Program

Onsite wastewater construction permits for Douglas County

(573) 751-6095 ext. 5

OnsiteProgram@health.mo.gov

930 Wildwood Dr. Jefferson City, MO 65102

Online permits →

Contact details are copied from each office’s official page and were checked against it on October 11, 2026.

Off-grid gear

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

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

Unincorporated Douglas County appears not to require a county residential building permit; confirm the parcel with the Douglas County Presiding Commissioner or County Clerk before construction123. Inside Ava, the city issues residential building permits4. Ava requires a building permit before one- and two-family residential construction begins; only qualifying ordinary repairs and minor alterations costing less than $200 are exempt12. Ava has also adopted the 2021 International Residential Code and 2021 International Building Code13. City building permits do not replace septic permits: Missouri DHSS remains the listed onsite-wastewater authority for Douglas County6. Separate driveway permits apply to work in MoDOT right-of-way, and floodplain development needs a community permit1415.

Who handles building-permit questions in Douglas County?

No dedicated Douglas County building department or building inspector could be confirmed; ask the County Commission or County Clerk where to direct the project23. For an unincorporated parcel, ask the Douglas County Presiding Commissioner or County Clerk whether a residential building permit, inspection, certificate of occupancy, zoning approval, setback or county-road access approval applies23. Inside Ava, the city issues residential building permits and applies its adopted building codes413. Ava's city process does not take over septic permitting: Missouri DHSS is the listed onsite-wastewater authority for Douglas County6. Other incorporated municipalities may set their own building and zoning rules under Missouri's local-adoption framework, so contact the municipality when land is inside city limits16.

Does Douglas County have zoning?

We could not confirm a Douglas County zoning ordinance for unincorporated land7. Ask the Douglas County Presiding Commissioner or County Clerk whether an unincorporated parcel needs zoning approval or must meet county setbacks, minimum lot size, building height, lot coverage or subdivision rules23. Inside Ava, the city sets zoning5. Ava’s residential handout lists a minimum lot area of 10,000 square feet for a single-family home in R-1 and 6,000 square feet for two-family R-2 or multifamily R-3 development10. Ava's zoning and building rules do not shift septic authority away from Missouri DHSS, which is listed for Douglas County6. For land in another incorporated municipality, ask that municipality about its own zoning approval and dimensional rules16.

How do septic permits work in Douglas County?

Missouri DHSS handles onsite-wastewater permits for Douglas County, including addresses inside Ava6. Residential systems on lots under 3 acres require a construction permit under the state baseline; nonresidential systems require one regardless of acreage, and DHSS must confirm whether a residential lot-size exemption applies8. Start by submitting the information through the DHSS application-number request form; do not begin septic work until a permit is issued or DHSS confirms an exemption1718. Septic application fees are temporarily suspended11. A property owner may install, modify or repair their own septic system but must comply with Missouri onsite-sewage law, including applicable septic permits9. Only 15.1% of Douglas County soils are rated without severe limits for a conventional drain field, so arrange a site evaluation before committing to a homesite19.

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

We could not confirm a Douglas County rule that answers long-term RV occupancy, temporary camping or tiny-home occupancy on private land7. We also could not confirm county minimum-home-size, setback or accessory-dwelling rules7. Ask the Douglas County Presiding Commissioner or County Clerk about the parcel and intended use before placing an RV or ordering a tiny home23. Off-grid does not mean sanitation-free: most onsite wastewater installations or repairs require approval, although some single-family residential lots may be exempt20. Missouri DHSS handles qualifying Douglas County systems, including single-family lagoons and soil-treatment systems handling no more than 3,000 gallons per day206. A location inside an incorporated municipality also requires a city-specific check because local code adoption can differ from the countywide answer16.

Building a home in Douglas County: the steps, in order

  1. Confirm whether the parcel is unincorporated or inside a municipality16.
  1. For unincorporated land, ask the Douglas County Presiding Commissioner or County Clerk about residential building permits, zoning approval and setbacks23. Inside Ava, obtain the city building permit before starting residential construction4.
  1. Request a septic application number through the DHSS form, then obtain a septic permit or DHSS-confirmed exemption before work begins1718.
  1. Evaluate the homesite, well location and wastewater area; only 15.1% of county soils are rated without severe limits for a conventional drain field19. A landowner may install their own private well or pump without a permit, while a contractor directing that work needs a restricted permit21.
  1. Obtain DNR approval for a subdivision, mobile-home park or campground planning onsite wastewater22.
  1. Obtain a driveway permit for work in MoDOT right-of-way14.
  1. Obtain a community permit for floodplain development; regulatory-floodway work also needs an engineering No-Rise Certificate15.

What should you check before buying land in Douglas County?

Only 15.1% of Douglas County soils are rated without severe limits for a conventional drain field, and 52.9% of the land has a slope of 15% or less1923. Confirm legal access and whether the driveway enters MoDOT right-of-way, where construction or modification requires a permit14. Check the flood map because every floodplain development needs a community permit, and regulatory-floodway work also requires an engineering No-Rise Certificate15. Confirm a workable septic area and well category; a landowner may install their own private well or pump without a permit, while public-water-system wells need written approval before construction or alteration unless a stated exemption applies2124. Missouri does not require a septic inspection for a property sale under the state baseline, but local requirements may differ; ask Missouri DHSS about the Douglas County parcel256. An inspection or evaluation requested by a buyer or lender must be performed by a licensed individual25.

Watch-outs

  • County zoning, RV occupancy, tiny-home rules, setbacks and minimum dwelling size remain unconfirmed; ask the Douglas County Presiding Commissioner or County Clerk before relying on an absence of published rules723.
  • Only 15.1% of Douglas County soils are rated without severe limits for a conventional septic drain field, so obtain a site-specific evaluation before assuming a standard system will work19.
  • Every floodplain development needs a community permit, and regulatory-floodway work also needs an engineering No-Rise Certificate15.
  • A driveway on MoDOT right-of-way requires a driveway permit regardless of the separate residential building-permit question14.

Sources

  1. Missouri Open Data Portal (data.mo.gov) - County Building Codes for Missouri (2026 county census)
  2. Douglas County Presiding Commissioner (mocounties.com)
  3. Douglas County Clerk (mocounties.com)
  4. Ava: Building Department (Douglas County), quoted and re-checked
  5. Ava: Zoning Map (Douglas County), quoted and re-checked
  6. OWTS Construction Permit Process, quoted and re-checked
  7. (2026 county census)
  8. health.mo.gov, quoted and re-checked
  9. RSMo Section 701.055 — Property owners may install, modify or clean their own on-site sewage disposal system, quoted and re-checked
  10. City of Ava Information Packet for Residential Construction, quoted and re-checked
  11. OWTS Construction Permit Process, quoted and re-checked
  12. City of Ava Information Packet for Residential Construction, quoted and re-checked
  13. Building Codes | Ava, MO, quoted and re-checked
  14. Permits, quoted and re-checked
  15. Floodplain Forms, quoted and re-checked
  16. RSMo Section 64.170 (Missouri statewide rule), quoted and re-checked
  17. OWTS Construction Permit Process, quoted and re-checked
  18. Missouri DHSS Onsite Wastewater Treatment Program (health.mo.gov)
  19. 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
  20. OWTS Construction Permit Process, quoted and re-checked
  21. Water Wells - PUB2945, quoted and re-checked
  22. OWTS Construction Permit Process, quoted and re-checked
  23. Share of land at 15% slope or less: Bolthole Index county data
  24. Who Regulates Water Wells in Missouri? - PUB4001, quoted and re-checked
  25. health.mo.gov, quoted and re-checked

Written October 11, 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

Like 4 of its 6 neighbors, Douglas County requires no county building permit for a home.

RuleDouglas CountyOzark CountyWright CountyChristian CountyWebster CountyTaney CountyTexas County
Building permitNot requiredNot requiredNot requiredRequiredNot requiredRequiredNot required
County zoningNot publishedNoNoYesNoYesNo
Septic permitsDHSSCounty Health Dept.County Health Dept.County Health Dept.County Health UnitCounty Env. Services Dept.County Health Dept.

County locator

Douglas County in Missouri

78
County map
Douglas County highlighted among the Missouri counties · colored by Index score

How Douglas County scores

Seclusion81100% ev.
Self-Sufficiency57100% ev.
Admin Boringness7868% ev.
Durability57100% ev.
Property Autonomy47100% ev.
Carry Cost82100% ev.

Evidence strength: 95%. This reports direct-source completeness and fallback use; it is separate from the score and is not a confidence interval. How it works →

$247kTypical home
0.4%Property tax
$2,936Land / acre
46.7"Annual rain
4.7% of yrsSevere drought
13.5 / yr (+11.1)Mid-century 100°F days
16.8 daysMid-century dry spell
2.05" (+5.8%)Mid-century 1-day rain
1.69×Wildfire change factor
100%Forward climate coverage
$1,975Home insurance / yr
3.7% / yrInsurance growth
0.81%Nonrenewal rate
county median (2+ published ZIPs)Insurance basis
4,410People within 30 min
893,823People within 2 hr
16,120Radius comparison (15 mi)
15People / sq mi
7.9%Federal land
52.9%Land at 15% slope or less
15.1%Soils rated "not limited" for septic (strict USDA rating)
78,760 acWorkable land screen
63%Wooded land
37.3 tonsBiomass / forest ac
56.1°FAvg temp

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Cities and towns in Douglas 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 Douglas County

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

Douglas County rules

  • Building permitNot required

    Missouri's official open-data building-code dataset lists no adopted energy or residential building code for Douglas County, and as a non-charter rural county it does not administer a countywide residential building-permit program. Corroborated by the state County Building Codes dataset (data.mo.gov iq7s-izvt, 2021): no county residential building code adopted.

    Missouri Open Data Portal (data.mo.gov) - County Building Codes for Missouri ↗Scouted from the county site, not yet independently re-checked

Missouri rules that apply here

  • Owner-builder exemptionAvailable (with conditions)

    A Missouri property owner installing, modifying, or repairing the owner's own on-site sewage disposal system, including in Douglas County.

    • The owner must comply with RSMo sections 701.025 to 701.059.
    • A construction permit is generally required for construction, major modification, or major repair unless an exception in RSMo section 701.031 applies.
    • The rule concerns on-site sewage disposal systems and does not establish a general exemption from building permits or other land-use approvals.
    “Nothing in sections 701.053 to 701.055 shall preclude property owners from installing, modifying or repairing their own on-site sewage disposal system as long as they comply with the provisions of sections 701.025 to 701.059.”
  • 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 septicMixed (with conditions)

    Onsite wastewater treatment systems statewide in Missouri.

    • DHSS administers minimum standards and permits through DHSS, local contract authorities, or local authorities operating under ordinance.
    • County or city governments may adopt standards stricter than the state standard.
    • DNR regulates lagoons serving anything other than single-family residences, systems discharging to surface waters, systems treating flows greater than 3,000 gallons per day and dispersing through soil absorption systems, and industrial wastewater systems.
    • DNR approval is required for subdivisions, mobile home parks, and campgrounds when OWTS use is planned.

    domestic wastewater flow threshold: <= 3000 gallons per day (DNR regulates systems with flows greater than 3,000 gallons per day when wastewater is dispersed through soil treatment or absorption systems)

    “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.”
    2 more reviewed findings on this topic
    • State (with conditions) — OWTS permitting in Missouri, including Douglas County.
      “Agency: DHSS Authority Type: DHSS [...] County: Douglas”
    • 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.”
  • Septic permitRequired

    Most onsite wastewater treatment system installations and repairs in Missouri, including Douglas County unless a documented exemption or different administering authority applies.

    • A construction permit is required before installing or repairing most OWTS.
    • Some single-family residential lots may be exempt from permitting.
    • The first step is determining the agency with permitting authority where the work occurs.
    • DHSS permitting may be administered by the DHSS Onsite Program, a contracted local authority, or a local authority operating under ordinance.
    • Work should not begin until a permit has been issued or an exemption has been confirmed.
    • Application fees were temporarily suspended effective August 28, 2026, pending new standards.
    • Lagoons serving anything other than a single-family residence fall under DNR jurisdiction.
    “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.”
    4 more reviewed findings on this topic
    • Required — Installation or repair of an onsite wastewater treatment system in Missouri, including Douglas County where the state baseline applies.
      “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 in Missouri, including residential systems subject to state permitting.
      “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 — 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
    • Not required (with conditions) — OWTS inspections or evaluations before real-estate transactions in Missouri, including Douglas County absent a local requirement.
      “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 — Onsite wastewater sanitation in Missouri, including Douglas County.
      “Single-family residential systems including lagoons; [...] 3,000 gallons per day or less”
    • 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”
    4 more reviewed findings on this topic
    • Limited — Water-well construction or repair in Missouri, including Douglas County.
      “A restricted [...] permit is required for someone to contract these activities [...] Landowners may install their own well or pump without a permit”
    • Limited — Public-water-system wells in Missouri, including Douglas 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.”
    • 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.”
    4 more reviewed findings on this topic
    • 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 [...]”
    2 more reviewed findings on this topic
    • Regulated (with conditions) — Subdivisions, mobile-home parks, and campgrounds in Missouri, including Douglas County, where onsite wastewater treatment systems are planned.
      “DNR must approve subdivisions, mobile home parks and campgrounds if the use of OWTS is planned. Developers as well as property owners in unapproved developments should contact DNR regarding their residential housing unit requirements.”
    • 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”
    One more reviewed finding on this topic
    • Required — Construction or modification of a driveway in MoDOT right-of-way in Missouri, including Douglas County.
      “We require you to obtain a permit to work on MoDOT's Right of Way for: Construction of driveways”
  • Building in a floodplainLimited

    Projects including mining, dredging, building construction, and other dirt-moving activities in designated flood hazard areas within participating Missouri jurisdictions.

    • The source describes local county or city flood damage reduction ordinances rather than one uniform statewide ordinance.
    • The project must be within a participating jurisdiction.
    • The project must be within a designated flood hazard area.
    • The cited rule does not apply if either condition is absent.
    • Covered projects must not raise flood heights.
    “Some jurisdictions (for example, county, city) require any projects in certain floodplains do not raise flood heights.”
    2 more reviewed findings on this topic
    • Required — Development in a Missouri floodplain, including Douglas County.
      “Regardless, some type of permit MUST be issued for ALL development in the floodplain.”
    • 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.”
    2 more reviewed findings on this topic
    • Published (with conditions) — OWTS construction, modification, and repair application fees in Missouri, including Douglas County.
      “Effective August 28, 2026, [...] application fees [...] will be temporarily suspended.”
    • 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.”
    3 more reviewed findings on this topic
    • Published (with conditions) — OWTS permit process in Douglas County.
      “Submit the information [...] to request an application number.”
    • Published (with conditions) — Missouri OWTS construction-permit process, including work in Douglas County subject to the applicable permitting authority.
      “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. Work should not begin until a permit has been issued or an exemption to permitting has been confirmed by the appropriate permitting authority.”
    • 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 Douglas County

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

  • Building permitRequired

    Residential one- and two-family construction within the City of Ava, Missouri.

    • Construction may not begin until the building permit is issued.
    • Ordinary repairs and minor alterations not involving a change in major structural parts and costing less than $200.00 do not require a building permit.
    • Permit fees are due when the issued permit is picked up.

    ordinary repair/minor alteration exemption threshold: < 200 USD (Applies only when no major structural parts such as walls, beams, girders, or chimneys are changed.)

    “Ordinary repairs and minor alterations not involving any change in major structural parts such as walls, beams, girders, or chimneys with an estimated cost less than $200.00 do not require the issuance of a building permit. Construction is not allowed to begin until a building permit is issued.”
  • Building code adoptedAdopted (with conditions)

    Building-code regulation within the City of Ava, Missouri.

    • The listed codes and amendments are available for public inspection in the City Clerk's office.
    • The adoption is identified as Ordinance #1163.

    adoption date: 2026-02-24 · residential code edition: 2021 International Residential Code · building code edition: 2021 International Building Code

    “The City of Ava adopted the 2021 International Building Codes on February 24, 2026. Ordinance #1163”
  • Minimum lot sizeSpecified

    Residential and multifamily development within the City of Ava, Missouri, under the zoning classifications identified in the City of Ava handout.

    • Requirements vary by zoning classification and dwelling type.

    minimum lot area, single-family R-1: >= 10000 square feet · minimum lot area, two-family R-2: >= 6000 square feet · minimum lot area, multifamily R-3: >= 6000 square feet

    “Minimum lot area (sq feet): single family R-1 is 10,000. Minimum lot area (sq feet): two-family R-2 is 6,000. Minimum lot area (sq feet): Multifamily R-3 is 6,000.”

Still unanswered

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

  • Inspections — Building inspections in unincorporated Douglas County.
  • Certificate of occupancy — Certificates of occupancy for buildings in unincorporated Douglas County.
  • County-wide zoning — Countywide zoning regulation, including unincorporated Douglas County.
  • Local zoning — The aggregate presence of zoning by municipalities, townships, or the county within Douglas County.
  • Minimum dwelling size — Minimum floor-area requirements for dwellings in unincorporated Douglas County.
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 Douglas County, Missouri

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

Douglas County scores 78/100 on the Bolthole Index, a strong county profile. Its strengths: manageable long-term carry cost and sparse surroundings — about 4,410 people within a 30-minute drive.

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

Douglas 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 (DHSS) - Onsite Wastewater Treatment Program. 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 Douglas County, Missouri?

Land in Douglas County runs about $2,936 per acre, based on the latest county data.

What is the water situation in Douglas County?

Douglas County gets about 46.7" of rain a year, with severe drought in roughly 4.7% of years.

How remote is Douglas County?

A representative private-land location has about 4,410 people within a 30-minute drive and 893,823 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 Douglas compares in Missouri

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