Bolthole Index

Lewis County, Missouri

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

77Index Score / 100
#18 of 115 in Missouri

Unincorporated Lewis County, Missouri does not require a general residential building permit, but zoning has not been confirmed one way or the other.12 Missouri DHSS handles onsite-wastewater permits in Lewis County, and most new or repaired systems need approval before work starts.34 Ask the County Commission about parcel-specific land-use requirements before buying or building.5

At a glance

Building permit
No general county residential permit in unincorporated Lewis County1
Building department
No county building or code-enforcement department is listed; start with the County Commission15
Zoning
Unconfirmed; ask the County Commission before relying on a parcel use25
Septic permits
Missouri DHSS is the listed authority for Lewis County36
RV or tiny-home living
No Lewis County rule was confirmed; ask the County Commission25
Owner-builder exemption
No county-specific exemption was confirmed7
Septic soils
Only 0.4% of soils lack severe limits for a conventional drain field8
State-highway driveway
A MoDOT right-of-way permit is required9

Who to call

Also useful

Lewis County Commission

Starting point for county building, zoning, floodplain and parcel-specific land-use questions when no dedicated office is listed

573-767-5476

Lewis County Courthouse, 100 East Lafayette Street, Monticello, MO 63457

Septic permits

Missouri DHSS Onsite Wastewater Treatment Program

Onsite-wastewater construction permits and application numbers for Lewis County

(573) 751-6095 ext. 5

930 Wildwood Dr, Jefferson City, MO 65102

Online permits →

Roads & driveways

Lewis County Road & Bridge

County-road access questions

573-767-5212

Contact details are copied from each office’s official page and were checked against it on September 28, 2026.

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

Unincorporated Lewis County does not require a general county residential building permit.1 Missouri adopts fire and building codes locally rather than through one uniform statewide building code, and Lewis County does not list a building or code-enforcement department.101 That answer is about the county's general residential permit, not every approval a project might trigger. A septic system, work in a state right-of-way, or development in a regulated flood hazard area can follow separate rules.4911 Incorporated cities can also have their own requirements, so confirm city rules separately when the parcel is inside municipal limits.

Who is the Lewis County building department, and who do you call?

Lewis County does not list a dedicated building or code-enforcement department, so the practical first call for an unincorporated parcel is the Lewis County Commission.15 The Commission is at the Lewis County Courthouse, 100 East Lafayette Street in Monticello, and its phone number is 573-767-5476.5 Ask the Commission to confirm whether the parcel lies in any locally regulated area and who handles floodplain questions. County-road access questions can go to Lewis County Road & Bridge at 573-767-5212.12 A driveway connecting to MoDOT right-of-way is different: construction or modification requires a state right-of-way permit.9

Does Lewis County, Missouri have zoning?

Lewis County zoning remains unconfirmed: no authoritative county zoning ordinance, zoning map, planning commission, or zoning office was located.2 Do not read that gap as proof that a parcel is unrestricted. Missouri law allows qualifying counties to establish zoning for unincorporated territory after voter approval, but the state-law framework does not establish whether Lewis County completed that process.13 Ask the Lewis County Commission specifically about the parcel's allowed use, setbacks, minimum lot size, minimum dwelling size, accessory dwellings, manufactured homes, RV occupancy, and tiny homes before committing to a plan.5 Private deed restrictions and subdivision covenants are separate from county zoning and should be checked in the title work.

How do septic permits work in Lewis County?

Missouri DHSS is the listed onsite-wastewater permitting authority for Lewis County; call (573) 751-6095 ext. 5 or use the state's online form to request an application number.6 A construction permit is required before installing or repairing most onsite wastewater systems, although some single-family residential lots may qualify for an exemption.4 Application fees for onsite sewage-system construction, modification, and repair are temporarily suspended effective August 28, 2026.14 Work should wait until DHSS issues the permit or confirms an exemption.6 Site and soil evaluation should come early: only 0.4% of Lewis County soils are rated without severe limits for a conventional septic drain field.8 For an existing home, local public-health agencies generally no longer inspect septic systems for real-estate transfers, but a private licensed inspector can evaluate the system.15

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

We could not confirm a Lewis County rule that answers full-time RV living, temporary camping, or tiny-home occupancy on private land. Because Lewis County zoning itself remains unconfirmed, a missing online rule is not permission to occupy a parcel without limits.2 Ask the Lewis County Commission about the specific parcel and proposed use before buying, moving an RV onto the land, or ordering a tiny home.5 Wastewater rules still apply to off-grid plans: Missouri prohibits treating a lack of central sewer as permission to discharge sewage onto the ground or into a road ditch, and most onsite systems require a permit unless an exemption applies.164

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

  1. Confirm that the parcel is in unincorporated Lewis County and ask the County Commission about zoning, floodplain status, and any parcel-specific land-use requirement.25
  1. Arrange the onsite-wastewater site work and request an application number from Missouri DHSS before construction; most new or repaired systems require a permit.64
  1. Confirm access with Lewis County Road & Bridge for a county road, or obtain a MoDOT right-of-way permit for a driveway on state right-of-way.129
  1. Confirm any municipal rules if the property is inside an incorporated city.
  1. Keep written confirmations with the survey, deed restrictions, septic approval, access approval, and construction documents.

What should you check before buying land in Lewis County?

Start with septic feasibility: only 0.4% of Lewis County soils are rated without severe limits for a conventional drain field, so make the purchase contingent on a satisfactory site and soil evaluation when wastewater is not already established.8 Most of the county is comparatively gentle terrain, with 82.4% of land at a slope of 15% or less, while 25.8% is wooded.1718 Confirm legal and physical access before closing; a driveway in MoDOT right-of-way needs a state permit.9 Lewis County's typical effective property-tax rate is about 0.7%, and the median annual property-tax bill is about $875.1920 Finally, ask the County Commission about zoning and floodplain administration because neither county zoning status nor a county floodplain office was confirmed.25

Watch-outs

  • Lewis County zoning, setbacks, minimum dwelling size, RV occupancy, and tiny-home occupancy remain unconfirmed; ask the County Commission about the parcel rather than assuming no rule applies.25
  • A general county residential building permit is not required, but septic and state-right-of-way permits are separate approvals.149
  • Lewis County's septic-soil rating is difficult: only 0.4% of soils lack severe limits for a conventional drain field.8

Sources

  1. Missouri Data Portal — County Building Codes dataset (2026 county census)
  2. (2026 county census)
  3. Missouri DHSS — OWTS Construction Permit Required (2026 county census)
  4. OWTS Construction Permit Process, quoted and re-checked
  5. Lewis County Commission (lewiscountymo.gov)
  6. Missouri DHSS Onsite Wastewater Treatment Program (health.mo.gov)
  7. Frequently Asked Questions (2026 county census)
  8. Share of soils without severe limits for a conventional septic drain field (USDA SSURGO): Bolthole Index county data
  9. Permits | Missouri Department of Transportation (Missouri statewide rule), quoted and re-checked
  10. RSMo Section 64.170 (Missouri statewide rule), quoted and re-checked
  11. Laws and Regulations That Might Affect You if You Mine Sand or Gravel From Missouri Streams (Missouri statewide rule), quoted and re-checked
  12. Lewis County Road & Bridge (lewiscountymo.gov)
  13. RSMo § 64.090 — Planning and zoning powers of county commission (Missouri statewide rule), quoted and re-checked
  14. OWTS Construction Permit Process (Missouri statewide rule), quoted and re-checked
  15. Onsite Wastewater Treatment System Inspections Versus Evaluations (Missouri statewide rule), quoted and re-checked
  16. Frequently Asked Questions (Missouri statewide rule), quoted and re-checked
  17. Share of land at 15% slope or less: Bolthole Index county data
  18. Wooded share of land: Bolthole Index county data
  19. Effective property tax rate: Bolthole Index county data
  20. Median property tax bill: Bolthole Index county data

Written September 28, 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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County locator

Lewis County in Missouri

77
County map
Lewis County highlighted among the Missouri counties · colored by Index score

How Lewis County scores

Seclusion74100% ev.
Self-Sufficiency62100% ev.
Admin Boringness7868% ev.
Durability54100% ev.
Property Autonomy47100% ev.
Carry Cost79100% 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 →

$213kTypical home
0.7%Property tax
$4,861Land / acre
39.5"Annual rain
6.1% of yrsSevere drought
8.6 / yr (+7.3)Mid-century 100°F days
17.2 daysMid-century dry spell
1.99" (+5.4%)Mid-century 1-day rain
1.83×Wildfire change factor
100%Forward climate coverage
$1,762Home insurance / yr
1.9% / yrInsurance growth
1.96%Nonrenewal rate
county median (2+ published ZIPs)Insurance basis
6,360People within 30 min
558,801People within 2 hr
10,694Radius comparison (15 mi)
19.4People / sq mi
0.7%Federal land
82.4%Land at 15% slope or less
0.4%Septic soil without severe limits
1,284 acWorkable land screen
25.8%Wooded land
44.8 tonsBiomass / forest ac
52.8°FAvg temp

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Answers from the rulebook for Lewis County

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

Lewis County rules

  • Building permitNot required

    Missouri has no statewide residential building code and Lewis is a non-charter rural county with no building/code-enforcement department; the state building-codes dataset lists no adopted residential code for the county. Corroborated by the state County Building Codes dataset (data.mo.gov iq7s-izvt, 2021): no county residential building code adopted.

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

Missouri rules that apply here

  • Owner-builder exemptionConditional

    Homeowner installation of an onsite wastewater treatment system in Missouri, including potentially Lewis County if no stricter local rule applies.

    • Homeowners may install their own system only in some instances.
    • A construction permit may still be required.
    • The homeowner must check with the local permitting authority.
    • The state page encourages use of a registered installer.
    “In some instances, homeowners may install their own system.”
  • Building code adoptedPartial

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

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

    Missouri wastewater treatment systems, including domestic onsite systems, larger-flow systems, direct discharges, lagoons, subdivisions, and industrial wastewater.

    • DNR regulates direct point-discharge or surface-land-application systems, non-individual lagoons, facilities exceeding 3,000 gallons per day, and industrial process waste.
    • DHSS or a local agency, typically the county health department, regulates single-family subsurface onsite systems, individual single-family lagoons, and qualifying systems at or below 3,000 gallons per day.
    • Local agencies may administer qualifying systems under local authority or ordinance.

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

    “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.”
    2 more reviewed findings on this topic
    • Required — Installing or repairing most onsite wastewater treatment systems in Missouri, including systems in Lewis County unless an applicable exemption or local rule changes the process.
      “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.”
    • Required — Most onsite wastewater treatment installations and repairs in Missouri, subject to the local authority and residential exemptions.
      “A construction permit is required before installing or repairing most onsite wastewater treatment systems (OWTS).”
  • Septic inspectionLimited

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

    • Local public health agencies generally no longer inspect existing systems for real-estate transfers.
    • A private licensed inspector may perform an inspection or evaluation.
    • A lender, buyer, or other transaction participant may require an assessment.
    • Some local standards may be more stringent than state regulations.
    • Inspections and evaluations are distinct; an inspection includes a hydraulic test, while an evaluation does not.
    “For the most part, local public health agencies no longer inspect existing systems related to real estate transfer. The help of a licensed inspector can be obtained to check the condition of the system.”
    One more reviewed finding on this topic
    • Limited — OWTS inspections or evaluations connected with Missouri real-estate transactions.
      “if a lender or buyer requests an inspection/evaluation, it must be conducted by a licensed individual.”
  • 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.”
  • Agricultural exemptionAvailable (with conditions)

    Erection, maintenance, repair, alteration, or extension of farm buildings or farm structures as against county fire-protection or fire-prevention ordinances.

    • The exemption applies to fire protection or fire prevention ordinances adopted by counties in Missouri.
    • The statutory text addresses farm buildings and farm structures; it does not establish a general exemption from every zoning, building-code, floodplain, septic, or other land-use requirement.
    • Effective August 28, 2025.

    effective date: 2025-08-28

    “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 landRegulated (with conditions)

    Property subdivision or development in Missouri, including Lewis County to the extent state jurisdiction applies.

    • Anyone subdividing or developing property must comply with DNR residential development regulations and the onsite sewage law.
    • DNR must approve subdivisions, mobile-home parks, and campgrounds if OWTS use is planned.
    “Anyone subdividing or developing property must comply with DNR residential development regulations”
  • Driveway accessRequired

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

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

    Missouri Department of Natural Resources air construction permits statewide.

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

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

    “Construction permit fees include a filing fee and an hourly processing fee. The filing fee is dependent on the type of construction permit.”
    One more reviewed finding on this topic
    • Published (with conditions) — Missouri onsite sewage-disposal construction, modification, and repair application fees.
      “application fees [...] will be temporarily suspended.”
  • Permit processPublished (with conditions)

    Permit applications for work on Missouri Department of Transportation right-of-way statewide.

    • The process applies to MoDOT right-of-way work.
    • Applicants may apply online, contact the area Traffic Specialist, or submit a hard-copy application by mail.
    • Additional documentation may be required depending on the work, including site plans, performance bond, certificate of liability, traffic studies, or a meeting with MoDOT personnel.
    • After issuance, Missouri One Call, a Notice of Intent, permit and approved-plan retention, and Traffic Specialist contact requirements apply.
    • Lane closures require a request at least two working days in advance and authorization before closing lanes.
    • The Traffic Specialist must be contacted at least 48 hours before beginning work and for necessary inspections.

    lane-closure advance request: >= 2 working days (authorization from MoDOT is also required) · Traffic Specialist pre-work contact: >= 48 hours (before beginning work)

    “Contact the Traffic Specialist a minimum of 48 hours prior to beginning work and for all necessary inspections.”
    One more reviewed finding on this topic
    • Published (with conditions) — Missouri OWTS permitting, including the process applicable where the state or a local authority administers the system.
      “Contact the local administrative authority to begin the permit process.”
  • county zoning authorityGeneral

    Missouri counties adopting zoning regulations for unincorporated territory.

    • First-class charter counties are empowered under RSMo § 64.090; that section excludes first-class counties without a charter form of government.
    • A first-class noncharter county or a county of the second, third, or fourth class may establish county zoning under RSMo §§ 64.845 to 64.880 only after the zoning question is submitted to county voters and a majority of votes cast favors county zoning.
    • The authority applies to unincorporated portions or territory and does not apply to incorporated portions under § 64.090.
    • Section 64.090 excludes specified agricultural activities and certain farm structures, underground mining, and protects existing lawful uses subject to gradual elimination of nonconforming uses.
    “If a majority of the votes cast is in favor of county zoning, the county commission shall proceed with a program of county zoning”
  • county building authorityLimited

    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.

    • RSMo § 64.170 grants the authority to counties of the first and second classification only.
    • The authority is subject to subsections 2 and 3.
    • A county that had not adopted a building code before August 28, 2001, under §§ 64.170 to 64.200, lacks authority to adopt one under those sections unless voters approve it.
    • The building-code authority vote is limited to voters in the affected area; a code affecting a county may not be voted on by citizens of incorporated territory.
    • The statute authorizes building regulations, building permits, inspections, licensing rules, and permit, license, and inspection fees.
    “the county commission in all counties of the first and second classification [...] is for this purpose empowered [...] to adopt [...] regulations to control the construction”

Still unanswered

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

  • Inspections — Building inspections in Lewis County.
  • Certificate of occupancy — Certificates of occupancy in Lewis County.
  • County-wide zoning — Countywide zoning authority in Lewis County, Missouri.
  • Local zoning — Aggregate local zoning controls across Lewis County municipalities and unincorporated areas.
  • Zoning districts — County zoning districts in Lewis County, Missouri, including unincorporated territory.
13 more unanswered
  • Minimum dwelling size
  • Minimum lot size
  • Setbacks
  • Lot coverage
  • Building height
  • Living in an RV
  • Camping on your land
  • Tiny homes
  • Manufactured homes
  • Accessory dwellings
  • Well permit
  • 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 Lewis County, Missouri

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

Lewis County scores 77/100 on the Bolthole Index, a strong county profile. Its strengths: manageable long-term carry cost and low administrative friction for a quiet rural property.

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

Lewis County does not require a county building permit for a home in unincorporated areas. Onsite septic is permitted by Missouri 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 Lewis County, Missouri?

Land in Lewis County runs about $4,861 per acre, based on the latest county data.

What is the water situation in Lewis County?

Lewis County gets about 39.5" of rain a year, with severe drought in roughly 6.1% of years.

How remote is Lewis County?

A representative private-land location has about 6,360 people within a 30-minute drive and 558,801 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.

Off-grid gear

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

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How Lewis compares in Missouri

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