Caldwell County, MO: Owner-Builder Allowed

Unincorporated Caldwell County, Missouri requires building permits before residential construction, additions, and listed prefabricated living quarters¹. Caldwell County Planning & Zoning administers zoning and ordinary septic permits outside city limits; new, repaired, or modified septic systems require inspection^1,2,3. Cameron, which reaches into Caldwell County from Clinton County, issues its own building permits and regulates zoning; private sewage disposal permits come from the city superintendent^4,5,6.

At a glance

Building permit: Required before covered residential construction in unincorporated areas¹
Zoning: County zoning applies in unincorporated areas; cities may have separate zoning²
Home permit fee: $0.30 per square foot, capped at $600 in unincorporated areas⁷
Septic permits: County Planning & Zoning outside cities; inspection required; specified systems go to Missouri DNR^1,3,8
Manufactured homes: Allowed as dwellings in specified districts, subject to district rules²
RV living: Long-term occupancy rules remain unconfirmed; ask Planning & Zoning²
Owner-builder: No exemption confirmed; ask Planning & Zoning before hiring or starting work⁹
Septic soils: Only 0.6% of soils are rated “not limited” for conventional drain fields; evaluate the site¹⁰

Who to call

Zoning

Caldwell County Planning & Zoning

Zoning, building contact, conditional use permits, rezoning and development requests in unincorporated Caldwell County

660-354-0383

zoning@caldwellco.missouri.org

76 North Franklin, P.O. Box 67, Kingston, MO 64650

Contact details are copied from each office’s official page and were checked against it on October 12, 2026.

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

In unincorporated Caldwell County, a building permit is required before constructing a full- or part-time residence, barn construction or conversion to living quarters, listed prefabricated living quarters, or residential addition¹. Submit building-permit and septic-permit materials with a site plan, septic-system plan, and dimensioned floor plan before construction¹. The county fee schedule for unincorporated Caldwell County charges dwellings and additions $0.30 per square foot, capped at $600, and barns or sheds over 100 square feet $0.15 per square foot, capped at $600⁷. The fee amendment puts barn and shed conversions used as living quarters in the dwelling category; the permit sheet describes barn fees differently, so confirm conversion charges with Planning & Zoning^1,7. Cameron, a city reaching into Caldwell County from Clinton County, issues its own building permits; private sewage disposal permits come from Cameron’s city superintendent^4,6.

Who handles Caldwell County building permits, and how do you reach the office?

Caldwell County Planning & Zoning is the first stop for building permits and zoning approval on unincorporated land: the county directs anyone building or adding an addition to contact that office before work begins¹¹. The office is at 76 North Franklin, P.O. Box 67, Kingston, MO 64650; call 660-354-0383 or email zoning@caldwellco.missouri.org¹¹. Planning & Zoning processes conditional-use applications, rezoning requests, and other development requests outside city limits¹¹. County building-permit and septic-permit application materials go to that office before construction^1,3. We could not confirm an owner-builder exemption in Caldwell County; ask Planning & Zoning before starting work yourself^9,11.

Does Caldwell County have zoning?

Caldwell County zoning applies to unincorporated land, with permitted, conditional, and prohibited uses determined by the parcel’s mapped district.

Caldwell County zoning applies to unincorporated land, with permitted, conditional, and prohibited uses determined by the parcel’s mapped district². Caldwell County zoning also regulates structure placement and preserves existing private restrictions; the county ordinance controls where it is more restrictive². Cameron, which reaches into Caldwell County from Clinton County, regulates its own city zoning and assigns private sewage disposal permits to the city superintendent^5,6. County minimum lot area varies by district: R1 requires 2 acres, RT-1 requires 2.5 acres, A-1 and L-1 require 5 acres, C-1 requires 1 acre, I-1 requires 2 acres, and PUD requires 5 acres per unit². Qualifying lots recorded when the ordinance took effect may have an exception to area or width requirements, subject to yard requirements or adjustment-board approval². Side and rear setbacks vary by district, road setbacks require separate review, and maximum building coverage ranges from 10% to 50%². Ask Planning & Zoning to confirm the parcel’s district and dimensions before buying or designing¹¹.

How do septic permits work in Caldwell County?

Caldwell County Planning & Zoning handles ordinary septic permits in the county-administered unincorporated area, with state standards also applying.

Caldwell County Planning & Zoning handles ordinary septic permits in the county-administered unincorporated area, with state standards also applying³. New, repaired, or modified septic systems require a septic permit and inspection; the published $250 fee includes the first inspection and one re-inspection^1,7. Submit a site plan, septic-system plan, and dimensioned floor plan before construction¹. Inside Cameron, private sewage disposal permits and inspections are handled by the city superintendent; county or state requirements for those addresses remain unconfirmed⁶. Missouri DNR regulates non-single-family lagoons, surface-water discharges, industrial wastewater, and soil-treatment systems handling more than 3,000 gallons per day; DNR approval is also required for onsite systems planned in subdivisions, mobile-home parks, or campgrounds⁸. Only 0.6% of Caldwell County soils are rated “not limited” for conventional drain fields, so obtain a site evaluation early; the rating does not mean septic is impossible¹⁰.

Can you live in an RV or tiny home on land in Caldwell County?

A tiny home requires a building permit in unincorporated Caldwell County, and covered prefabricated structures include camp trailers, mobile-home trailers, modular homes, tiny homes, and shed conversions used as living quarters¹. The county fee schedule covers part- or full-time living quarters at $0.30 per square foot, capped at $600; a listed fee category replaces the default $50 filing fee⁷. Manufactured and mobile homes are allowed as dwellings in specified residential, agricultural, and lake districts, while mobile-home parks or recreational-trailer parks require conditional-use approval in specified districts². We could not confirm long-term RV occupancy, temporary camping, tiny-home occupancy conditions, or a minimum dwelling size, so ask Planning & Zoning for a written parcel-specific answer before purchase or placement¹¹. Wastewater may not be discharged into a road ditch or onto the ground¹².

What are the steps to building a home in Caldwell County?

Confirm whether the parcel is unincorporated; county zoning applies outside city limits.

Confirm whether the parcel is unincorporated; county zoning applies outside city limits².

Ask Planning & Zoning to confirm the district, proposed use, minimum lot area, setbacks, and coverage^2,11.

Prepare a site plan, septic-system plan, and dimensioned floor plan, and submit county building-permit and septic-permit materials before construction¹.

Confirm wastewater jurisdiction: Planning & Zoning handles ordinary unincorporated systems, while Missouri DNR handles specified systems and developments^3,8.

Budget $0.30 per square foot, capped at $600, for a dwelling or addition and $250 for the county septic permit with inspection; arrange the required septic inspection^1,7.

Obtain a state driveway permit before constructing or modifying a driveway in MoDOT right-of-way¹³.

Ask Planning & Zoning about construction codes, building inspections, and occupancy approval; we could not confirm those requirements¹¹.

What should you check before buying land in Caldwell County?

Start with septic feasibility: only 0.6% of Caldwell County soils are rated “not limited” for a conventional drain field, so make a satisfactory site evaluation part of the purchase decision.

Start with septic feasibility: only 0.6% of Caldwell County soils are rated “not limited” for a conventional drain field, so make a satisfactory site evaluation part of the purchase decision¹⁰. Confirm the zoning district, proposed use, minimum lot area, setbacks, and lot-coverage limit with Planning & Zoning before relying on usable-acreage estimates^2,11. Verify legal road access, and remember that a new or modified driveway in MoDOT right-of-way requires a state permit¹³. Missouri requires a permit for floodplain development and an engineering No-Rise Certificate for proposed development in a regulatory floodway; ask Planning & Zoning to identify the applicable community floodplain administrator^11,14. For budgeting context, the typical home value is about $249,480, the effective property-tax rate is about 0.8%, and the median annual property-tax bill is about $1,230¹⁰.

Watch-outs

Starting a project governed by the county zoning ordinance before obtaining the required building permit or zoning approval can result in a fee equal to double the listed amount⁷.
Do not apply one district's dimensions to another: minimum lot area, side and rear setbacks, and maximum building coverage all vary by zoning district².
We could not confirm in Caldwell County an owner-builder exemption, general building-inspection rule, certificate-of-occupancy rule, or residential building-code adoption; ask Planning & Zoning before contracting or starting work^9,11.
Do not assume every wastewater project goes through the county: Missouri DNR handles specified discharges, larger systems, non-residential lagoons, industrial wastewater, subdivisions, mobile-home parks, and campgrounds⁸.

Sources

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

Written October 12, 2026 from the rules quoted below, each taken from an official source and re-checked by an independent reviewer. This is research, not legal advice: rules change, so confirm with the office before you buy or build.

Off-grid gear

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

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Compared with neighboring counties

Like 4 of its 6 neighbors, Caldwell County requires a building permit for a home.

Rule	Caldwell County	Daviess County	Clinton County	Ray County	Livingston County	DeKalb County	Clay County
Building permit	Required	Not required	Required	Required	Required	Not required	Required
County zoning	Yes	No	Yes	Yes	Yes	No	Yes
Septic permits	DHSS	County Health Dept.	County Health Dept.	County Health Dept. Env. Health	DHSS	DHSS	County Public Health Center

Cities and towns in Caldwell 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 covered: Breckenridge Township · Cowgill · Davis Township · Fairview Township · Gomer Township · Grant Township · Hamilton Township · Kidder · Kidder Township · Kingston · Kingston Township · Mirabile Township · New York Township · Rockford Township

Answers from the rulebook for Caldwell County

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

Caldwell County rules

Building permitRequired
Full-time or part-time residences, barns converted to living quarters, additions, and prefabricated structures in unincorporated Caldwell County.
- The permit is required before construction.
- Covered prefabricated structures include camp trailers, mobile home trailers, modular homes, tiny homes, shed living-quarter conversions, and similar structures.
- Building and septic permits must be submitted with a site plan, septic system plan, and dimensioned floor plan prior to construction.
“This section of the Ordinance states that a building permit is required prior to any (full or part-time) residence, a barn being constructed or barn converted into living quarters.”
Caldwell County Zoning Permits Required ↗Re-checked Sep 29, 2026
County-wide zoningPresent (with conditions)
Comprehensive county zoning regulations administered by Caldwell County in the unincorporated areas of Caldwell County, Missouri.
- The ordinance regulates land uses and placement of structures by dividing the unincorporated county into zones.
- The ordinance does not repeal or impair existing laws, ordinances, rules, regulations, permits, or private restrictions; where this ordinance imposes a greater restriction, its provisions control.
- Incorporated municipalities may have separate municipal zoning regimes.
“comprehensive zoning regulations for the unincorporated areas of Caldwell County, Missouri”
Caldwell County Zoning Ordinance 2010-2025 ↗Re-checked Oct 7, 2026
One more reviewed finding on this topic
- Present (with conditions) — Caldwell County zoning regulation in unincorporated areas.
  “For the purposes of this ordinance the unincorporated areas of the County are hereby divided into zoning districts, as shown on the Zoning Map which, together with all explanatory matter thereon, is hereby incorporated reference and declared to be a part of this ordinance.”
  Caldwell County Zoning Ordinance 2010-2025 ↗Re-checked Oct 7, 2026
Local zoningPresent (with conditions)
County-administered zoning in the unincorporated areas of Caldwell County, Missouri; this claim does not assert that the county administers municipal zoning inside incorporated cities or towns.
- The ordinance divides the unincorporated county into zones and regulates uses of land and placement of structures.
- Existing laws, ordinances, rules, regulations, permits, and private restrictions continue to apply; the county ordinance controls where it imposes a greater restriction.
- The 2024 fee amendment states that the order amending Section XIX is effective immediately upon passage and lists permit fees, including a $0.30 per square foot fee capped at $600 for single or multi-family dwellings, including manufactured homes, tiny homes, mobile homes, shipping containers, camper, barn and shed conversions, and other living quarters.
- A failure to obtain a permit before starting a project is subject to a fee double the stated amount under the 2024 fee amendment.
“comprehensive zoning regulations for the unincorporated areas of Caldwell County, Missouri”
Caldwell County Zoning Ordinance 2010-2025 ↗Re-checked Oct 7, 2026
Zoning districtsPublished (with conditions)
Zoning districts identified in the Caldwell County ordinance for unincorporated areas.
- The dimensional table identifies R1, RT-1, A-1, L-1, C-1, I-1, and PUD districts.
- District-specific use and dimensional rules may require consulting other ordinance sections.
“For the purposes of this ordinance the unincorporated areas of the County are hereby divided into zoning districts, as shown on the Zoning Map which, together with all explanatory matter thereon, is hereby incorporated reference and declared to be a part of this ordinance.”
Caldwell County Zoning Ordinance 2010-2025 ↗Re-checked Sep 29, 2026
Minimum lot sizeDistrict specific (with conditions)
Minimum per-unit lot area in unincorporated Caldwell County zoning districts.
- The table states that it governs minimum lot size, setback, and coverage requirements.
- A one-family detached dwelling on any lot of official record at the ordinance's effective date may be erected irrespective of area or width if applicable yard or open-space requirements are satisfied or modified by the Zoning Board of Adjustment.
- The ordinance states that the most restrictive applicable law, ordinance, rule, regulation, permit, deed restriction, or covenant governs.
R1 minimum per unit lot area: 2 acres · RT-1 minimum per unit lot area: 2.5 acres · A-1 minimum per unit lot area: 5 acres · L-1 minimum per unit lot area: 5 acres · C-1 minimum per unit lot area: 1 acre · I-1 minimum per unit lot area: 2 acres · PUD minimum per unit lot area: 5 acres
“R1 100 ft. 2.0 acres 15% 10 ft. 30 ft. RT-1 100 ft. 2.5 acres 10% 20 ft. 45 ft. A-1 200 ft. 5 acres 10% 50 ft. 75 ft. L-1 200 ft. 5 acres 15% 50 ft. 100 ft. C-1 200 ft. 1 acre 50% 10 ft. 35 ft. I-1 200 ft. 2 acres 50% 12-22 ft.* 10-25 ft.* PUD 200 ft. 5 acres 50% 25 ft. 25 ft.”
Caldwell County, Missouri Zoning Ordinance ↗Re-checked Oct 4, 2026
SetbacksDistrict specific (with conditions)
Minimum side- and rear-yard setbacks in unincorporated Caldwell County zoning districts.
- The table states that it governs minimum lot size, setback, and coverage requirements.
- I-1 side and rear yard values are marked with an asterisk and refer to a chart on page 38; those starred standards were not independently resolved.
- Section 4.9 highway and road setback requirements were identified but not fully extracted.
- The applicable yard or open-space requirements may be modified by the Zoning Board of Adjustment under Section XVIII for qualifying recorded lots.
- The most restrictive applicable requirement governs where another applicable law, ordinance, rule, regulation, permit, deed restriction, or covenant imposes a greater restriction.
R1 minimum side yard: 10 feet · R1 minimum rear yard: 30 feet · RT-1 minimum side yard: 20 feet · RT-1 minimum rear yard: 45 feet · A-1 minimum side yard: 50 feet · A-1 minimum rear yard: 75 feet · L-1 minimum side yard: 50 feet · L-1 minimum rear yard: 100 feet · C-1 minimum side yard: 10 feet · C-1 minimum rear yard: 35 feet · I-1 minimum side yard: 12-22 feet (See page 38 chart.) · I-1 minimum rear yard: 10-25 feet (See page 38 chart.) · PUD minimum side yard: 25 feet · PUD minimum rear yard: 25 feet
“R1 100 ft. 2.0 acres 15% 10 ft. 30 ft. RT-1 100 ft. 2.5 acres 10% 20 ft. 45 ft. A-1 200 ft. 5 acres 10% 50 ft. 75 ft. L-1 200 ft. 5 acres 15% 50 ft. 100 ft. C-1 200 ft. 1 acre 50% 10 ft. 35 ft. I-1 200 ft. 2 acres 50% 12-22 ft.* 10-25 ft.* PUD 200 ft. 5 acres 50% 25 ft. 25 ft.”
Caldwell County, Missouri Zoning Ordinance ↗Re-checked Oct 4, 2026
Lot coverageDistrict specific (with conditions)
Maximum building coverage in unincorporated Caldwell County zoning districts.
- The table states that it governs minimum lot size, setback, and coverage requirements.
- The most restrictive applicable requirement governs where another applicable law, ordinance, rule, regulation, permit, deed restriction, or covenant imposes a greater restriction.
R1 maximum building coverage: 15 percent · RT-1 maximum building coverage: 10 percent · A-1 maximum building coverage: 10 percent · L-1 maximum building coverage: 15 percent · C-1 maximum building coverage: 50 percent · I-1 maximum building coverage: 50 percent · PUD maximum building coverage: 50 percent
“R1 100 ft. 2.0 acres 15% 10 ft. 30 ft. RT-1 100 ft. 2.5 acres 10% 20 ft. 45 ft. A-1 200 ft. 5 acres 10% 50 ft. 75 ft. L-1 200 ft. 5 acres 15% 50 ft. 100 ft. C-1 200 ft. 1 acre 50% 10 ft. 35 ft. I-1 200 ft. 2 acres 50% 12-22 ft.* 10-25 ft.* PUD 200 ft. 5 acres 50% 25 ft. 25 ft.”
Caldwell County, Missouri Zoning Ordinance ↗Re-checked Oct 4, 2026
Living in an RVLimited
Camp trailers used as residence in unincorporated Caldwell County
- Building permit required under Zoning Ordinance Section 18 before a camp trailer is used as a full or part-time residence
- Permit application needs site plan, septic system plan and floor plan with dimensions, submitted before construction
- Septic permit required and inspected to state standards
- Fee schedule 2026 amendment not confirmed signed
building permit fee, new living quarters: 0.3 USD per square foot (described as current fee on a 2024 county page)
“the building permit requirement also applies to prefabricated structures including; camp trailers, mobile home trailers (single or double wide), modular homes, tiny homes, shed living quarters conversions and similar structues.”
Caldwell County Planning and Zoning - Zoning Permits Required ↗Re-checked Nov 12, 2026
Tiny homesLimited
Tiny homes in unincorporated Caldwell County
- Building permit required before construction or placement
- Site plan, septic system plan and floor plan with dimensions required
- Septic permit required, inspected to state standards
- Zoning district limits not reviewed
“the building permit requirement also applies to prefabricated structures including; camp trailers, mobile home trailers (single or double wide), modular homes, tiny homes, shed living quarters conversions and similar structues.”
Caldwell County Planning and Zoning - Zoning Permits Required ↗Re-checked Nov 12, 2026
Manufactured homesLimited
Manufactured/mobile-home residential occupancy in the county's unincorporated zoning districts.
- R-1 permits mobile homes in conformance with RSMo Chapter 700 (2000).
- RT-1 permits single-family mobile homes; mobile-home parks are conditional uses.
- A-1 permits single mobile homes; mobile-home and recreational-trailer parks are conditional uses.
- L-1 permits mobile homes in conformance with RSMo Chapter 700 (2000), and prohibits any use of a mobile home except as a dwelling.
- District dimensional, foundation, wastewater, and other ordinance requirements also apply.
“The purpose of the RT-1 District is to provide residential sites for mobile homes in rural areas which will not be served by public sewer and water services. 8.2. Permitted Uses: 1. Single family mobile homes. 8.3. Conditional Uses: 1. Mobile home (trailer coaches) parks.”
Caldwell County Zoning Ordinance, Sections VI-XII ↗Re-checked Oct 4, 2026
Who permits septicCounty (with conditions)
Onsite wastewater permitting for the county-administered unincorporated area.
- The county permit sheet directs applicants to obtain and submit the septic permit to the Caldwell County Planning and Zoning Office.
- State standards also apply.
- Authority may differ in incorporated areas or for wastewater systems regulated by Missouri DNR.
“Any construction, installation or modification of an individual sewage treatment system shall require the property owner or agent to obtain a permit from the Caldwell County Zoning Administrator before construction can begin.”
Caldwell County Zoning Permits Required ↗Re-checked Sep 29, 2026
Septic permitRequired
New, repaired, or modified septic systems in unincorporated Caldwell County.
- The county permit sheet states that the septic permit is required and that the system must comply with state standards.
- Missouri DHSS states that some single-family residential lots may be exempt and that the applicable permitting authority must be determined.
septic permit fee: 250 USD (The county permit sheet states this includes a required septic inspection.)
“For a new, or a repair or a modification to an existing septic system, a septic permit is required, the current fee is $250.00, which includes a required septic inspection.”
Caldwell County Zoning Permits Required ↗Re-checked Sep 29, 2026
Septic inspectionRequired
New, repaired, or modified septic systems in unincorporated Caldwell County.
- The inspection is included in the stated septic permit fee.
- The system must comply with state standards.
“For a new, or a repair or a modification to an existing septic system, a septic permit is required, the current fee is $250.00, which includes a required septic inspection.”
Caldwell County Zoning Permits Required ↗Re-checked Sep 29, 2026
Permit feesPublished (with conditions)
Permits and related zoning applications governed by Section XIX of the Caldwell County Zoning Ordinance.
- The filing fee for all permits is $50.00 unless a different amount is listed in the permit fee schedule.
- Single or multi-family dwellings, including manufactured homes, tiny homes, mobile homes, shipping containers, campers, barn and shed conversions, and other living quarters, are charged $0.30 per square foot with a $600 maximum.
- Additions to existing dwellings are charged $0.30 per square foot with a $600 maximum.
- Barns and sheds over 100 square feet are charged $0.15 per square foot with a $600 maximum.
- In-ground swimming pools, small solar systems over 25kw up to 100kw, and signs are charged $50.00.
- Commercial buildings, arrays, or other structures are charged $0.50 per square foot.
- Commercial electronic towers are charged $5.00 per foot.
- Commercial buildings at electronic towers are charged $100.00 plus $0.30 per square foot.
- A variance for a building, dwelling, structure, or other item is charged $200.00.
- A septic system for a home or business with inspection, including the first and one re-inspection, is charged $250.00.
- Commercial solar systems with inspection are charged $2,500.00 plus $0.10 per kilowatt.
- Public hearing costs are $165.00 plus $5.00 for each property-owner letter and $50.00 for a newspaper advertisement.
- Failure to obtain a permit before starting the project is subject to double the stated fee.
- The amendment states that it is effective immediately upon passage by the County Commission.
default permit filing fee: 50 USD (Unless listed in the permit fee schedule.) · single or multi-family dwelling fee: per 0.3 USD per square foot ($600 maximum; includes manufactured homes, tiny homes, mobile homes, shipping containers, campers, barn and shed conversions, and other living quarters.) · addition to existing dwelling fee: per 0.3 USD per square foot ($600 maximum.) · barn or shed fee: per 0.15 USD per square foot (Applies to barns and sheds over 100 square feet; $600 maximum.) · in-ground swimming pool fee: 50 USD · commercial building, array, or other structure fee: per 0.5 USD per square foot · commercial electronic tower fee: per 5 USD per foot (Commercial electronic tower, cell or other.) · commercial building at electronic tower fee: 100 USD (Plus $0.30 per square foot.) · variance fee: 200 USD (For a building, dwelling, structure, or other item.) · septic system fee: 250 USD (Home or business with inspection, first inspection and one re-inspection.) · small solar system fee: 50 USD (Over 25kw up to 100kw.) · commercial solar system fee: 2500 USD (With inspection, plus $0.10 per kilowatt.) · sign fee: 50 USD · public hearing base cost: 165 USD (Plus $5.00 for each property-owner letter and $50.00 newspaper advertisement.) · fee for failure to obtain permit before project start: 2 times stated fee
“Section l9 (19.2.3 and 19.3) Permit Fee Schedule; The filing fee for all permits is $ 50.00, unless listed in the permit fee schedule below;”
Caldwell County Zoning Ordinance Section XIX Fee Amendment ↗Re-checked Sep 23, 2026
2 more reviewed findings on this topic
- Published (with conditions) — Published permit fees for county zoning/building and septic permits.
  “For new construction living quarters or a new home addition, a building permit is required, the current fee is $.30 cents per square foot. For a new or added square footage to a barn, the current fee is $.15 cents per square foot. For a new, or a repair or a modification to an existing septic system, a septic permit is required, the current fee is $250.00, which includes a required septic inspection.”
  Caldwell County Zoning Permits Required ↗Re-checked Sep 29, 2026
- Published (with conditions) — Permits governed by the Caldwell County Zoning Ordinance in the unincorporated areas of Caldwell County, Missouri.
  “The filing fee for all permits is $ 50.00, unless listed in the permit fee schedule below;”
  Caldwell County Zoning Ordinance 2010-2025 ↗Re-checked Oct 6, 2026
Permit processPublished (with conditions)
County building and septic permit application process in unincorporated Caldwell County.
- Submit building and septic permits with a site plan, septic system plan, and dimensioned floor plan before construction.
- Submit materials to the Planning and Zoning Office at 76 North Franklin Street, Kingston, Missouri.
- The county page lists office hours Monday-Thursday, 9:00 a.m.-3:00 p.m., and instructs applicants to call before visiting.
“The building and septic permits must be obtained and submitted with a site plan, septic system plan and floor plan with dimensions, prior to construction, to the Planning and Zoning Office at 76 North Franklin St. Kingston, Missouri.”
Caldwell County Zoning Permits Required ↗Re-checked Sep 29, 2026

Missouri rules that apply here

Owner-builder exemptionAvailable (with conditions)
A property owner installing, modifying, or repairing that owner's on-site sewage disposal system.
- The owner must comply with RSMo 701.025 to 701.059.
- The statute separately provides that an owner need not obtain a permit or contractor registration merely to clean that owner's on-site sewage disposal system.
“Nothing in sections 701.053 to 701.055 shall preclude property owners from installing, modifying or repairing their own on-site sewage disposal system”
RSMo 701.055 — Property owners may install, modify or clean their own on-site sewage disposal system ↗Re-checked Nov 4, 2026
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”
RSMo Section 64.170 ↗Re-checked Sep 11, 2026
2 more reviewed findings on this topic
- Partial — Residential building-code adoption by Missouri counties, particularly construction in unincorporated county territory.
  “the county commission in all counties of the first and second classification [...] is for this purpose empowered [...] to adopt [...] regulations”
  RSMo § 64.170 — County commissions control construction; issue building permits ↗Re-checked Oct 1, 2026
- Partial — County adoption of residential building codes in Missouri, with the resulting regulations applicable to unincorporated territory when adopted under the statutory authority.
  “the county commission in all counties of the first and second classification, as provided by law, is for this purpose empowered”
  RSMo Section 64.170 — County commissions control construction; issue building permits ↗Re-checked Oct 1, 2026
InspectionsLimited
Construction, major modification, or major repair of an on-site sewage disposal system for which RSMo 701.046 requires notice and an application; this is not a general statewide inspection rule for all buildings.
- The city, county, or department must receive notice and an opportunity to inspect before completion.
- A registered contractor must notify the authority before 9:00 a.m. on the day before completion; an unregistered person must notify it before 9:00 a.m. on the second day before completion.
- The system must remain available for a complete inspection under the state standard until 3:00 p.m. on the completion day unless the authority confirms earlier inspection and approval.
- The system may not be closed or completed if inspection finds it does not meet the state standard; the authority must provide conspicuous notice at inspection and written confirmation of the result, or of no inspection, within three working days of completion.
“without providing notice and an opportunity for inspection by the city, county or department as provided in this section.”
RSMo 701.050 — Construction or repair notice, requirements and inspection ↗Re-checked Nov 4, 2026
Minimum dwelling sizeDistrict specific (with conditions)
Potential county zoning controls on the size of residential buildings in unincorporated portions of first-class counties other than first-class counties without a charter form of government.
- The county commission is authorized to regulate by order in accordance with a comprehensive plan.
- The statute does not state a statewide minimum dwelling-size measurement.
- The statute expressly excludes incorporated portions of counties and identifies additional agricultural, rice-farming, flood-irrigation, farm-structure, and underground-mining exclusions.
“except in counties of the first class not having a charter form of government [...] in the unincorporated portions of the county [...] size of buildings”
RSMo § 64.090 — Planning and zoning powers of county commission ↗Re-checked Nov 4, 2026
Camping on your landLimited
Developments where land is sold or leased for camping in recreational vehicles (recreational developments) under the state wastewater rule 10 CSR 20-6.030; this is a wastewater-disposal rule, not a zoning rule on camping generally
- Applies only when land is sold or leased for the purpose of camping in recreational vehicles.
- To qualify as a recreational development, restrictive covenants must prohibit continuous year-round living on the lot, and no cabins or other structures that could be used for year-round residential purposes are allowed.
- Minimum lot size of 20,000 sq ft applies where individual on-site wastewater treatment facilities are used; no reduction from the minimum lot size determined by the geohydrologic evaluation, though a one-half reduction as indicated by the soils report may be allowed.
- Where sewage dump stations provide collection and treatment, they count as centralized collection and treatment.
- The developer must submit a copy of the restrictive covenants with any plans for dump stations or centralized systems.
- Any residential housing development required to obtain department approval must get written approval before sale or lease of any lot or start of construction.
- Rule text says it does not preclude local, municipal, county or other lawful authority from adopting equal or more stringent subdivision, sewer or on-site system regulations.
- Rule was last amended with an effective date of Jan. 30, 2025.
- The state rule does not itself regulate temporary camping on private land outside such developments; that is left to local zoning.
minimum lot size, recreational development with individual on-site wastewater treatment: >= 20000 square feet (one-half reduction per soils report may be allowed; no reduction from geohydrologic evaluation minimum)
“a development is considered recreational when land is sold or leased for the purpose of camping in recreational vehicles. in order to be considered a recreational development, restrictive covenants must prohibit continuous year-round living on the lot and no cabins or other structures will be allowed that could be used for year-round residential purposes.”
10 CSR 20-6 Permits (incl. 10 CSR 20-6.030 Disposal of Wastewater in Residential Housing Developments), Missouri Secretary of State, Code of State Regulations ↗Re-checked Nov 6, 2026
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.”
health.mo.gov ↗Re-checked Sep 11, 2026
One more reviewed finding on this topic
- Allowed (with conditions) — Use of onsite wastewater treatment systems as off-grid sanitation where central sewer service is unavailable in Missouri.
  “In Missouri, where central sewer service is not available, homeowners and small business owners use various types of onsite wastewater treatment systems (OWTS).”
  Onsite Wastewater Treatment ↗Re-checked Oct 1, 2026
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”
Who Regulates Water Wells in Missouri? - PUB4001 ↗Re-checked Oct 5, 2026
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.”
  Well and Pump Installation Contractor Permitting ↗Re-checked Oct 1, 2026
- 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.”
  Water Wells - PUB2945 ↗Re-checked Oct 5, 2026
Mandatory utility hookupSewer (with conditions)
Missouri state law preserves the authority of specified local governments and districts that own or operate a sewage-collection-and-treatment sewer system to require connection by owners of houses, buildings, or other facilities within that entity's territory.
- This is an authorization for the applicable city, town, village, sewer district, public water supply district, municipality, political subdivision, or district; it is not a statewide mandate that every property connect.
- The entity must own or operate a sewer system providing collection and treatment of sewage.
- The house, building, or other facility must be within the municipality, political subdivision, or district.
- The sewer system must be available.
- The statute identifies sewer districts organized under chapter 204 or chapter 249 and public water supply districts organized under chapter 247 among the entities whose authority is preserved.
“to require the owners of all houses, buildings or other facilities [...] to connect to the sewer system [...] when such sewer system is available.”
Missouri Revisor of Statutes — RSMo § 644.027 ↗Re-checked Nov 4, 2026
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.”
RSMo Section 64.890 — Building and land use restrictions; exemptions ↗Re-checked Oct 5, 2026
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.”
  RSMo Section 64.003 — Farm buildings and farm structures ↗Re-checked Sep 11, 2026
- 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 [...]”
  RSMo Section 64.890 ↗Re-checked Oct 1, 2026
- 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 [...]”
  revisor.mo.gov ↗Re-checked Oct 1, 2026
- 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.”
  RSMo Section 64.003 — Farm buildings and farm structures ↗Re-checked Oct 5, 2026
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 [...]”
RSMo Section 64.070 ↗Re-checked Oct 1, 2026
One more reviewed finding on this topic
- Limited — Subdivision regulations adopted by Missouri cities, towns, or villages under RSMo section 89.410.
  “The planning commission shall recommend and the council may by ordinance adopt regulations governing the subdivision of land within its jurisdiction.”
  RSMo Section 89.410 ↗Re-checked Oct 1, 2026
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”
Permits | Missouri Department of Transportation ↗Re-checked Sep 11, 2026
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.”
Laws and Regulations That Might Affect You if You Mine Sand or Gravel From Missouri Streams ↗Re-checked Sep 11, 2026
One more reviewed finding on this topic
- 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.”
  Floodplain Forms ↗Re-checked Oct 5, 2026
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.”
RSMo § 64.850 — County commission may prescribe zoning regulations ↗Re-checked Oct 1, 2026
2 more reviewed findings on this topic
- General — Missouri counties adopting zoning regulations for unincorporated territory.
  “If a majority of the votes cast is in favor of county zoning, the county commission shall proceed with a program of county zoning”
  RSMo § 64.090 — Planning and zoning powers of county commission ↗Re-checked Sep 21, 2026
- Limited — Missouri county zoning of unincorporated land.
  “counties of the second, third or fourth class may, after approval by vote of the people [...] in the unincorporated portions of the county”
  RSMo § 64.090 — Planning and zoning powers of county commission ↗Re-checked Oct 1, 2026
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”
RSMo Section 64.170 — County commissions control construction; issue building permits ↗Re-checked Oct 1, 2026
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”
  RSMo § 64.170 — County commissions control construction and issue building permits ↗Re-checked Sep 21, 2026
- 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”
  RSMo § 64.170 — County commissions control construction; issue building permits ↗Re-checked Oct 1, 2026

Still unanswered

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

Certificate of occupancy — Certificates of occupancy for buildings in unincorporated Caldwell County.
Building height — Building-height limits in unincorporated Caldwell County.
Accessory dwellings — Accessory dwelling units in unincorporated Caldwell County.
Short-term rentals — Short-term rental use in unincorporated Caldwell County.

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

Living off-grid in Caldwell County, Missouri

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

Caldwell County scores 64/100 on the Bolthole Index, a strong county profile. Its strengths: manageable long-term carry cost and mixed durability signals.

How much does land cost in Caldwell County, Missouri?

Land in Caldwell County runs about $4,467 per acre, based on the latest county data.

What is the water situation in Caldwell County?

Caldwell County gets about 39.7" of rain a year, with severe drought in roughly 7.3% of years.

How remote is Caldwell County?

A representative private-land location has about 19,201 people within a 30-minute drive and 2,819,584 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.

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