Bolthole Index

Ralls County, Missouri

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

65Index Score / 100
#85 of 115 in Missouri

Unincorporated Ralls County, Missouri requires a county building permit for covered residential construction; the published residential fee is $25012. County zoning applies to unincorporated land, with district-specific lot standards and restrictions on new dwellings in the Flood Plain District345. The Ralls County Health Department handles domestic septic permits, and installers must arrange inspection before backfilling unless an exception applies67.

At a glance

Building permit
Required for covered construction in unincorporated areas1
Zoning
Yes, for unincorporated Ralls County8
Septic permit
Required through the Ralls County Health Department96
Certificate of occupancy
Required in specified cases, including buildings that require a wastewater permit10
RV living
General private-land occupancy was not confirmed; ask Planning & Zoning11
Tiny homes
No specific occupancy rule or minimum dwelling size was confirmed; zoning still applies1211
Owner-builder
No county owner-builder exemption was confirmed13
Minimum lot size
3 acres for single-family lots in A-1 and R-1; 15,000 sq ft with approved central sewer144

Who to call

Planning & zoning

Ralls County Planning & Zoning

Zoning, construction applications and land-use questions in unincorporated Ralls County

573-822-4608

rallszoning@rallscountymo.gov

311 S. Main Street, New London, MO 63459

Septic permits

Ralls County Health Department

Domestic onsite sewage permits and environmental health questions

573-985-7121

16369 Business 61, New London, MO 63459

Floodplain permits

Ralls County Road & Bridge

County floodplain questions, county roads, culverts and driveway pipes

573-406-9611

roadbridgesec@rallscountymo.gov

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

Off-grid gear

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

Unincorporated Ralls County requires a permit for covered construction, reconstruction, enlargement, relocation or alteration, including residential work1. The published fee is $250 for residential construction and $100 for a residential addition; beginning work without a permit can double the permit fee2. Missouri does not impose one uniform statewide building code, and we could not confirm that Ralls County has adopted a comprehensive residential building code15. For permitted structures that require a wastewater permit, the county inspects for compliance with its zoning order before issuing the occupancy certificate; the rule does not establish a general building-code inspection program for every structure161710. Qualifying farm buildings or structures without sewer systems are exempt from the county zoning order outside the Flood Plain District, but that exception does not cover every agricultural project18. We could not confirm an owner-builder exemption from the construction-permit requirement; owners doing their own work should ask Planning & Zoning what application information is required1311.

Who handles building permits in Ralls County, Missouri?

Ralls County Planning & Zoning is the first stop for building permits and zoning approval in unincorporated Ralls County111. The office can be reached at 573-822-4608 or rallszoning@rallscountymo.gov, and applications are by appointment11. The construction application calls for plans, site dimensions and acreage, existing and proposed structures, utility and sewage details, traffic and driveway information, bedrooms, bathrooms, and a Health Department sewer construction permit when applicable19. Published fees include $250 for residential construction, $100 for a residential addition and $50 for an accessory building over 100 square feet; the schedule is reviewed annually, so confirm the current charge2. Ask Planning & Zoning to identify the parcel's district, permitted use, lot standard and setbacks before finalizing plans20421. Road & Bridge is the county floodplain contact, and MoDOT approval is required if a driveway enters state right-of-way222324. Monroe City, which lies mainly in Monroe County but reaches into Ralls County, issues its own building permits for structural changes or electrical upgrades25. Monroe City also requires a private sewage-disposal permit signed by the city superintendent, subject to state health requirements26.

Does Ralls County, Missouri have zoning?

Ralls County zoning covers unincorporated land, including unincorporated towns and villages, while incorporated areas are excluded312. The published districts include Agricultural, Single-Family Residential, Recreational and Residential, and Flood Plain, with standards that vary by district and use2027. Single-family lots need 3 acres in both the A-1 and R-1 districts, with 300 feet of frontage in A-1 and 150 feet in R-114. A dwelling tied directly to an approved central sewer can drop to 15,000 square feet and 100 feet of frontage144. Other districts and uses have their own standards, so confirm the parcel with Planning & Zoning11. Setbacks vary by district and use, so Planning & Zoning should confirm the applicable yard dimensions rather than applying a countywide figure2111. Subdivision is also regulated: a final plat generally needs Planning Commission approval before recording, and a building permit or occupancy certificate cannot be issued for a lot in a covered post-effective-date subdivision until its plat is recorded2829. The subdivision definition does not apply to a transfer of agricultural land to an immediate family member (son, daughter, sister, brother, father, mother or grandchild), limited to one release per family member, and the recipient must hold each parcel for one year before it changes hands again; zoning, health and septic rules still apply to the parcel30. In the Flood Plain District, the zoning order states there shall be no additional dwellings constructed after its effective date, so check the district map before buying near a stream5.

Hannibal and Monroe City, cities lying mainly in Marion and Monroe counties respectively but reaching into Ralls County, administer their own zoning3132. Private sewage-disposal approvals also involve Hannibal’s building inspector or Monroe City’s superintendent, with state requirements still applying3326.

How do septic permits work in Ralls County, Missouri?

Ralls County Health Department administers permits for domestic onsite sewage systems6. A county permit is required to construct, install, modify, replace, repair or operate a covered wastewater treatment system9. Ralls County septic installers must notify the Health Department 4–48 hours before installation and leave the system uncovered and open for full inspection until at least 3 PM on the day of completion, unless the Department authorizes backfilling or rain is imminent; missed notice can require uncovering the system734. Only about 1.7% of Ralls County soils lack severe conventional-drain-field limits; make a site and soil evaluation a purchase contingency35. Where an approved sewer is not reasonably accessible, an individual system may be allowed only when the lot has enough area and applicable county, state and federal requirements are met36. Missouri allows some single-family septic permit exemptions, but local rules can be stricter; obtain the county permit or have the Health Department confirm an exemption before work begins379. For an existing septic system at purchase, hire a private licensed inspector; local health agencies generally no longer provide transfer inspections38. Larger, discharging or other specified wastewater systems may fall under Missouri DNR instead of the local program39. Missouri has temporarily suspended statewide onsite wastewater application fees, but local processes can differ; ask the Ralls County Health Department for the current local charge4041.

Can you live in an RV or tiny home in Ralls County, Missouri?

We could not confirm a general rule allowing long-term residential RV occupancy on an ordinary private parcel in unincorporated Ralls County, so ask Planning & Zoning about the parcel, duration, utilities and wastewater plan before relying on an RV11. Mobile-home parks and single-family mobile homes are conditional uses in specified districts, while a trailer or mobile home may be used temporarily after a residence is damaged and uninhabitable under the county's limited emergency provision42. Those mobile-home provisions do not establish general permission for residential RV occupancy42. We could not confirm a specific tiny-home occupancy rule or a countywide minimum dwelling floor area; ask Planning & Zoning about the proposed home11. A tiny home must still fit the parcel's zoning district, lot-size and setback standards, obtain any required construction permit, and meet wastewater-related occupancy requirements8421110. Off-grid sanitation still requires an approved solution36.

What are the steps to build a home in Ralls County, Missouri?

  1. Ask Ralls County Planning & Zoning to confirm that the parcel is unincorporated, identify its district and verify that the dwelling use, lot size and setbacks fit842111.
  2. Confirm that any land division has an approved and recorded plat before seeking a permit for a covered subdivision lot; subdivision roads and access must meet the county's platting standards432944.
  3. Have the Ralls County Health Department review the wastewater plan and issue the required septic construction permit before work begins941.
  4. Ask Road & Bridge about floodplain constraints; obtain MoDOT approval if the driveway enters state right-of-way222324.
  5. Assemble the site, structure, utility, sewage and driveway details and submit the county construction application by appointment1911.
  6. Notify the Health Department 4–48 hours before septic installation, arrange inspection before backfilling unless an exception applies, and obtain any required compliance inspection and occupancy certificate before moving in71610.

What should you check before buying land in Ralls County?

Ralls County's unincorporated land is zoned, residential lot standards specify 3 acres with an approved central-sewer exception, and applicable setbacks depend on the district and use3421. A covered subdivision lot may be blocked from a building permit until its plat is recorded, and subdivision access standards do not establish a universal driveway permit for every parcel2944. Septic deserves special attention because only about 1.7% of county soils are rated without severe limits for a conventional drain field35. About 82.4% of county land has a slope of 15% or less, but gentle terrain does not establish septic suitability4535. Check the superimposed Flood Plain District and legal road access before fixing a house site; floodplain restrictions can also remove the farm-structure exemption2218. We could not confirm a county private-well permit rule, but Missouri requires permitted contractors for regulated well construction and pump work46. The effective property-tax rate is about 0.8%, with a median annual bill of about $1,1614748.

Watch-outs

  • Rural land in unincorporated Ralls County is zoned; confirm the district before relying on acreage, setbacks or an intended use820.
  • Only about 1.7% of county soils are rated without severe limits for a conventional septic drain field, so make onsite wastewater approval a purchase contingency359.
  • The farm-structure exemption applies only to qualifying structures without sewer systems outside the Flood Plain District; do not assume agricultural land avoids every permit18.
  • We could not confirm general permission for residential RV use, a tiny-home rule, a minimum dwelling floor area, a county private-well permit rule or an owner-builder exemption; ask Planning & Zoning and the Health Department before committing to those plans114113.

Sources

  1. Planning and Zoning Order of Ralls County, Missouri, quoted and re-checked
  2. Planning and Zoning Fee Schedule for Ralls County, quoted and re-checked
  3. Planning & Zoning – Ralls County Missouri, quoted and re-checked
  4. Ralls County Planning and Zoning Order, as of May 12, 2025, quoted and re-checked
  5. Application for Construction Permit, quoted and re-checked
  6. Ralls County Health Department - Environmental (2026 county census)
  7. Ralls County Health Department Procedures to Obtain a Permit for an On-Site Wastewater Treatment System, quoted and re-checked
  8. Ralls County Planning and Zoning Order and Subdivision Regulations, quoted and re-checked
  9. Missouri DHSS Onsite Wastewater Resources, quoted and re-checked
  10. Ralls County Planning and Zoning Order, quoted and re-checked
  11. Ralls County Planning & Zoning (rallscountymo.gov)
  12. Ralls County Planning and Zoning Order, as of May 12, 2025, quoted and re-checked
  13. (2026 county census)
  14. Ralls County Planning and Zoning Order, quoted and re-checked
  15. RSMo Section 64.170 (Missouri statewide rule), quoted and re-checked
  16. Ralls County Planning and Zoning Order, quoted and re-checked
  17. Planning and Zoning Order of Ralls County, Missouri, quoted and re-checked
  18. Planning and Zoning Order of Ralls County, Missouri, quoted and re-checked
  19. Planning & Zoning – Ralls County Missouri, quoted and re-checked
  20. Ralls County Planning and Zoning Order, quoted and re-checked
  21. Ralls County Planning and Zoning Order, quoted and re-checked
  22. Ralls County Planning and Zoning Order, quoted and re-checked
  23. Ralls County Road & Bridge (rallscountymo.gov)
  24. Permits | Missouri Department of Transportation (Missouri statewide rule), quoted and re-checked
  25. Monroe City: Building Permit (Ralls County), quoted and re-checked
  26. Monroe City: Private Sewage Disposal System Permit Required; Fees (Ralls County), quoted and re-checked
  27. Planning and Zoning Order of Ralls County, Missouri, quoted and re-checked
  28. Ralls County Subdivision Regulations, quoted and re-checked
  29. Subdivision Regulations of Ralls County, Missouri, quoted and re-checked
  30. Subdivision Regulations of Ralls County, Missouri, quoted and re-checked
  31. Hannibal: Building Inspector | City of Hannibal, MO (Ralls County), quoted and re-checked
  32. Monroe City: Chapter 90 - Zoning, Definitions (Ralls County), quoted and re-checked
  33. Hannibal: Hannibal Code § 25-72, Private or semi-public sewage disposal (Ralls County), quoted and re-checked
  34. rallscountymo.gov, quoted and re-checked
  35. 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
  36. Ralls County Planning and Zoning Order, quoted and re-checked
  37. OWTS Construction Permit Process (Missouri statewide rule), quoted and re-checked
  38. Onsite Wastewater Treatment System Inspections Versus Evaluations (Missouri statewide rule), quoted and re-checked
  39. OWTS Construction Permit Process (Missouri statewide rule), quoted and re-checked
  40. OWTS Construction Permit Process (Missouri statewide rule), quoted and re-checked
  41. Ralls County Health Department (rallscountyhealth.org)
  42. Planning and Zoning Order of Ralls County, Missouri, quoted and re-checked
  43. Planning and Zoning Order of Ralls County, Missouri, quoted and re-checked
  44. Subdivision Regulations of Ralls County, Missouri, quoted and re-checked
  45. Share of land at 15% slope or less: Bolthole Index county data
  46. Well and Pump Installation Contractor Permitting (Missouri statewide rule), quoted and re-checked
  47. Effective property tax rate: Bolthole Index county data
  48. 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.

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Compared with neighboring counties

RuleRalls CountyMarion CountyPike CountyAudrain CountyMonroe CountyShelby CountyMontgomery County
Building permitRequiredRequiredLimitedNot requiredRequiredNot requiredRequired
County zoningYesYesNoNoYesNoYes
Septic permitsCounty Health Dept.County Health Dept.County Health Dept.County Health Dept.County Health Dept.MO Dept. of Health & Senior ServicesCounty Health Dept.

County locator

Ralls County in Missouri

65
County map
Ralls County highlighted among the Missouri counties · colored by Index score

How Ralls County scores

Seclusion49100% ev.
Self-Sufficiency63100% ev.
Admin Boringness6090% ev.
Durability52100% ev.
Property Autonomy47100% ev.
Carry Cost74100% ev.

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

$264kTypical home
0.8%Property tax
$5,816Land / acre
39.7"Annual rain
5.2% of yrsSevere drought
12.9 / yr (+10.9)Mid-century 100°F days
15.6 daysMid-century dry spell
1.84" (+5.8%)Mid-century 1-day rain
1.83×Wildfire change factor
100%Forward climate coverage
$1,760Home insurance / yr
5.2% / yrInsurance growth
1.07%Nonrenewal rate
county median (2+ published ZIPs)Insurance basis
39,132People within 30 min
2,955,540People within 2 hr
18,547Radius comparison (15 mi)
22.3People / sq mi
1.6%Federal land
82.4%Land at 15% slope or less
1.7%Soils rated "not limited" for septic (strict USDA rating)
5,047 acWorkable land screen
29.8%Wooded land
40.6 tonsBiomass / forest ac
53.6°FAvg temp

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Cities and towns in Ralls 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: Center · Village of Rensselaer

Answers from the rulebook for Ralls County

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

Ralls County rules

  • Building permitRequired

    Construction, reconstruction, enlargement, relocation, or alteration of buildings where the county order requires a building or conditional-use permit.

    • The cited violation provision applies where a building permit or conditional-use permit is required.
    • The county order excludes incorporated portions of the county and specified agricultural activities and farm structures outside the floodplain district.
    “Residential $250 for any square footage; this covers anything under the roof [...] Construction w/o Permit Fine Double the permit fee”
  • InspectionsLimited

    Permitted structures requiring a wastewater permit before issuance of a certificate of occupancy.

    • The inspection is tied to certificate-of-occupancy issuance and checks compliance with the county order.
    • The cited provision does not establish a general building-code inspection program for every structure.
    “Prior to the issuance of a certificate of occupancy, the permitted structure shall be inspected by the Administrative Officer or appointed agents to make sure said structure is in compliance with all of the regulations contained in this Order.”
    One more reviewed finding on this topic
    • Required — County inspection authority for permitted construction and structures in unincorporated Ralls County.
      “Prior to the issuance of a certificate of occupancy, the permitted structure shall be inspected by the Administrative Officer or appointed agents to make sure said structure is in compliance with all of the regulations contained in this Order.”
  • Certificate of occupancyRequired

    Buildings requiring a wastewater permit in unincorporated Ralls County.

    • The certificate application must be submitted at the same time as the wastewater-permit application.
    • No fee is charged for the certificate.
    • The structure must pass inspection before issuance.

    certificate fee: 0 USD

    “No building requiring a waste water permit shall be occupied before a certificate of occupancy has been issued by the Administrative Officer.”
    One more reviewed finding on this topic
    • Limited — Land or structures in subdivisions created after the effective date of the Ralls County subdivision regulations.
      “No parcel of land in a subdivision created after the effective date of these regulations shall be transferred, sold, or offered for sale; nor shall a building permit be issued for any structure thereon; nor shall a certificate of occupancy for the use of any land or structure thereon be issued, until a plat of subdivision shall have been recorded with the Recorder of Deeds in accordance with these regulations.”
  • County-wide zoningPresent (with conditions)

    Zoning regulation in unincorporated Ralls County, including unincorporated towns and villages.

    • The order applies to unincorporated areas only; incorporated portions of the county are excluded.
    • The order became effective after submission to and acceptance by the County Commission following a proper public hearing, according to the ordinance text.
    “The regulations contained in this Order shall apply to all unincorporated lands located within Ralls County, Missouri.”
    One more reviewed finding on this topic
    • Present (with conditions) — Planning and zoning regulation in unincorporated Ralls County.
      “The regulations contained in this Order shall apply to all unincorporated lands located within Ralls County, Missouri.”
  • Local zoningPresent (with conditions)

    Structures and land uses in unincorporated Ralls County, Missouri.

    • The order applies to all unincorporated lands within Ralls County.
    • Certain agricultural activities and other activities explicitly exempted by the order or statute are exceptions.
    • Applicable local, county, and state regulations also apply, including regulations imposed by the Missouri Department of Natural Resources and the Ralls County Health Department.
    “The regulations contained in this Order shall apply to all unincorporated lands located within Ralls County, Missouri.”
  • Zoning districtsPublished

    Published zoning districts and district map for unincorporated Ralls County.

    • The ordinance identifies Agricultural, Single-family Residential, Recreational and Residential, Rural Community, Commercial, Industrial, and Flood Plain districts.
    • The district boundaries are shown on the Ralls County Zoning District Map, which is part of the order and filed with the County Clerk.
    “The unincorporated area of Ralls County is hereby divided and classified into the following districts:”
    One more reviewed finding on this topic
    • Published (with conditions) — Published zoning districts for unincorporated Ralls County.
      “The unincorporated area of Ralls County is hereby divided and classified into the following districts:”
  • Minimum lot sizeSpecified

    Residential lots in unincorporated Ralls County zoning districts.

    • The ordinance states a minimum lot area of 130,680 square feet, identified as 3 acres.
    • A central sewer exception may reduce the minimum lot size for a residential duplex or single-family dwelling to 15,000 square feet.

    minimum lot area: 130680 square feet (3 acres) · central-sewer minimum lot size: 15000 square feet (where the system ties directly into an approved central sewer system)

    “Single-Family Dwelling 3 acre [...] then the lot frontage for the single-family dwelling may be 100 feet and the minimum lot size for the single-family dwelling may be reduced to 15,000 square feet.”
    One more reviewed finding on this topic
  • SetbacksSpecified

    District-specific yard setbacks in unincorporated Ralls County.

    • A-1 single-family residences require 80-foot front, 50-foot side, and 80-foot rear setbacks.
    • R-1 single-family dwellings require 40-foot front, 30-foot side, and 80-foot rear setbacks.
    • R-2 standards differ, including 40-foot front, 15-foot side, and 15-foot rear setbacks for accessory buildings.
    • Setbacks are measured from property edges or right-of-way lines; accessory buildings have a minimum 15-foot side and rear yard in the cited general provision.

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

    “Front yard setback 40’ Side yard setback 30’ Rear yard setback 80’”
  • Manufactured homesLimited

    Manufactured/mobile-home parks and mobile homes in unincorporated Ralls County.

    • Mobile-home parks are listed as conditional uses in residential and commercial districts.
    • The county construction-permit form separately identifies single mobile homes and mobile-home parks.
    • The ordinance provides a temporary 120-day trailer or mobile-home use after a residence is damaged and uninhabitable.

    temporary damaged-residence period: 120 days (subject to the ordinance's termination rule)

    “The conditional uses are as follows: [...] Mobile home park [...] Single-family mobile home”
  • Septic inspectionRequired

    Installation and covering of onsite wastewater systems in Ralls County.

    • The installer must notify the Health Department 48 to 4 hours before installation.
    • The system must not be backfilled until inspected or authorization is received, unless rain is imminent.
    • If notification is not provided, the system may be required to be uncovered for inspection.

    advance notification window: 48 to 4 hours (before beginning installation)

    “Unless the Department has given authorization to cover or backfill the system prior to inspection and approval, the system shall not be covered or backfilled and shall be kept in a condition to allow for full inspection until at least 3 PM on the day of completion.”
    One more reviewed finding on this topic
    • Required — On-site wastewater system installations governed by the county ordinance.
      “Unless the Department has given authorization to cover or backfill the system prior to inspection and approval, the system shall not be covered or backfilled and shall be kept in a condition to allow for full inspection until at least 3 PM on the day of completion.”
  • Off-grid sanitationLimited

    Private onsite sanitation where no approved public or private sewer is reasonably accessible.

    • Where an approved and adequate sewer is reasonably accessible, subdivision development must connect to it.
    • Where no sewer is accessible, an individual sewage-disposal system may be allowed if lot area is sufficient and all county, state, and federal requirements are met.
    • Approval by the Ralls County Health Department and, if necessary, DNR is required.
    “Where no sewers are accessible, the developer shall install sewer lines and a disposal system in accordance with the requirements of the Ralls County Health Department, The Clean Water Commission and the Missouri Department of Natural Resources. Individual sewage disposal systems for each lot shall be allowed provided the sub-divided lots are of a sufficient square foot area to adequately provide for proper disposal for an individual sewage disposal system.”
  • Agricultural exemptionConditional

    Certain transfers of agricultural land under the Ralls County subdivision regulations.

    • The transfer must be to an immediate family member of the owner of agricultural land.
    • Only one release may be made to any one immediate family member.
    • The recipient must retain each transferred piece of land for one year before it may change hands again.
    • The exemption is from the subdivision definition; other zoning, health, septic, or applicable requirements may still apply.

    retention period: 1 year · releases per immediate family member: 1 release

    “This definition shall not apply to the transfer of land to an immediate member of the owner of agricultural land, provided that only one (1) release may be made to any one (1) member. Immediate family member shall mean a son, daughter, sister, brother, father, mother or grandchild. Each piece of land transferred shall be retained by the recipient for a period of one (1) year before the parcel of land may again change hands.”
    One more reviewed finding on this topic
    • Available (with conditions) — Raising crops, livestock, orchards, forestry, and certain farm buildings or structures in unincorporated Ralls County.
      “The regulations contained in this Order shall not apply to the erection, maintenance, repair, alteration or extension of farm building or farm structures without sewer systems used for such purposes in an area not within the Flood Plain District.”
  • Subdividing landRegulated (with conditions)

    Residential development and subdivision in unincorporated Ralls County.

    • The zoning order states that residential property in the R-1 district typically must be divided into lots and is subject to Ralls County Subdivision Regulations.
    • The construction-permit form includes subdivision as an application type.
    • Subdivision and campground/mobile-home-park fees are $50 per lot in the published fee schedule.

    subdivision/campground/mobile-home-park fee: 50 USD per lot

    “If, after examination, the Administrative Officer finds that the application does not conform to minimum lot or yard standards or other regulations, or those requirements contained in the subdivision regulations, the Administrative Officer will reject the application, with a copy delivered to the applicant.”
    One more reviewed finding on this topic
    • Regulated (with conditions) — Subdivision of land within unincorporated Ralls County.
      “These regulations prescribe the procedures for the subdivision of land within the unincorporated areas of Ralls County and comprise the requirements, standards and specifications with respect to the avoidance of congestion of population through appropriate layout of subdivision blocks, lots and access; the proper location and extent of streets, building lines, open spaces and utility services; the extent to which and the manner in which streets are to be graded and improved; and, the extent to which water, sewer, storm water and other utility services shall be provided to protect public health and general welfare.”
  • Driveway accessLimited

    Access and road-layout requirements for subdivisions in unincorporated Ralls County.

    • The cited requirements concern subdivision platting and subdivision streets/roads, not a separately stated universal driveway-access permit for every parcel.
    • The regulations apply to unincorporated lands within Ralls County.
    • Existing county roads adjacent to a subdivision need not be brought into conformity with the subdivision construction standards, but must be provided the required normal half-width right-of-way.
    • Subdivision roads and streets must comply with Ralls County Highway Department standards.
    “These regulations prescribe the procedures for the subdivision of land within the unincorporated areas of Ralls County and comprise the requirements, standards and specifications with respect to the avoidance of congestion of population through appropriate layout of subdivision blocks, lots and access;”
  • Building in a floodplainLimited

    Construction and development in the county Flood Plain Overlay or Flood Plain District.

    • The construction-permit form requires elevations of utilities and structures in the Flood Plain Overlay District.
    • Farm-building exemptions do not apply within the Flood Plain District.
    • The zoning order lists a Flood Plain District and conditional uses subject to county approval.
    “There shall be no additional dwellings constructed in this District after the effective date of this zoning order.”
    One more reviewed finding on this topic
    • Limited — Development in the Ralls County Flood Plain District.
      “This District, superimposed on the underlying zoning district regulations, is established in order to promote public health and safety, and to minimize property losses, by limiting uses of land which carry a high probability of placing persons or property in serious jeopardy during times of flooding.”
  • Permit feesPublished

    Ralls County planning and zoning permit fees.

    • Residential permit: $250 for any square footage covering anything under the roof.
    • Residential addition: $100.
    • Non-residential/commercial: $0.50 per square foot with a $1,000 minimum; over 10,000 square feet drops to $0.40 per square foot.
    • Accessory building over 100 square feet: $50; agricultural permit over 100 square feet: $25; subdivision/campground/mobile-home park: $50 per lot.
    • Fees are subject to annual increase review in November, with changes effective January 1 of the following year.
    • Construction without a permit is fined at double the permit fee; permits expire after one year.

    residential permit fee: 250 USD (any square footage; covers anything under the roof) · residential addition fee: 100 USD · subdivision/campground/mobile-home-park fee: 50 USD per lot

    “Residential $250 for any square footage; this covers anything under the roof”
  • Permit processPartial

    Ralls County Planning and Zoning applications and construction permits.

    • Applications are by appointment only.
    • The construction application requires plans, site dimensions and acreage, existing and proposed structures, utility and sewage information, traffic patterns, driveway information, bedrooms, bathrooms, and a sewer construction permit from the Ralls County Health Department when applicable.
    • Applicants agree to pay processing costs.
    “I (We) agree to pay all costs associated with processing this Application for Construction Permit.”

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
  • 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.”
    One more reviewed finding 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.”
  • 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 — Most residential onsite wastewater systems and all non-residential onsite systems in Missouri, including Ralls County unless a local exception 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 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.”
  • 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”
    2 more reviewed findings on this topic
    • 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.”
  • county zoning authorityLimited

    Missouri county zoning authority over unincorporated land.

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

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

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

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

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

Still unanswered

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

  • Owner-builder exemption — Owner-builders undertaking construction in unincorporated Ralls County.
  • Minimum dwelling size — Minimum dwelling size in unincorporated Ralls County.
  • Lot coverage — Lot coverage in unincorporated Ralls County.
  • Building height — Building height in unincorporated Ralls County.
  • Living in an RV — Long-term or residential occupancy of recreational vehicles on private land in unincorporated Ralls County.
5 more unanswered
  • Camping on your land
  • Tiny 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 Ralls County, Missouri

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

Ralls County scores 65/100 on the Bolthole Index, a strong county profile. Its strengths: manageable long-term carry cost and workable self-sufficiency basics (39.7″/yr rainfall).

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

Ralls County generally requires a residential building permit, and it enforces county zoning. Onsite septic is permitted by Ralls County Health Department - Environmental (Onsite Wastewater). 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 Ralls County, Missouri?

Land in Ralls County runs about $5,816 per acre, based on the latest county data.

What is the water situation in Ralls County?

Ralls County gets about 39.7" of rain a year, with severe drought in roughly 5.2% of years.

How remote is Ralls County?

A representative private-land location has about 39,132 people within a 30-minute drive and 2,955,540 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 Ralls compares in Missouri

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