Unincorporated Lafayette County, Missouri requires building permits for dwellings and other structures that count as development under its Land Development Code1. The county also has voter-adopted zoning for unincorporated land2. Private septic jurisdiction depends on the parcel and project: county planning handles unincorporated parcels of 25 acres or less, while the Health Department handles specified town, commercial and public-building systems34.
At a glance
- Building permit
- Required for dwellings and other structures that constitute development in unincorporated Lafayette County1
- Residential permit fee
- $300; contact county planning before submitting payment15
- Zoning
- Yes, for unincorporated Lafayette County; city properties go through their city hall2
- Septic permits
- Permits and inspections are required for new systems and major modifications or repairs under county authority67
- RV living
- Long-term occupancy was not confirmed; ask Planning & Economic Development for the parcel-specific rule8
- Tiny home
- Occupancy and minimum dwelling size were not confirmed; ask county planning before buying8
- Owner-builder
- No owner-builder permit exemption was confirmed; ask county planning before assuming one applies9
- Floodplain work
- County approval is required before development begins in or near mapped flood-prone land10
Who to call
Building permits
Lafayette County Planning & Economic Development
Building, septic and floodplain development permits, zoning compliance, land splits and other approvals in unincorporated Lafayette County
Zoning
Lafayette County Planning & Economic Development
Zoning, the Land Development Code, special-use permits, variances, farm splits and subdivisions in unincorporated Lafayette County
1001 Main Street, Lexington, MO 64067
Health department
Lafayette County Health Department
Private sewage systems in towns without their own sewage codes and commercial or public-building systems in unincorporated Lafayette County
Contact details are copied from each office’s official page and were checked against it on September 27, 2026.
Do you need a building permit in Lafayette County, Missouri?
Yes. Unincorporated Lafayette County requires building permits for dwellings and other buildings involving structural construction, foundations, utilities or occupancy when they constitute development under the Land Development Code, regardless of property size1. The published fee is $300 for a residential building permit, $400 for a commercial non-residential permit and $300 for an accessory-building permit1. Do not begin work first: construction without approval can lead to a stop-work order, fines or other legal action11. Missouri's farm-structure protection is narrower than a blanket permit exemption; it prevents county fire-protection or fire-prevention ordinances from imposing permits on qualifying farm buildings, but it does not erase zoning, septic or floodplain requirements12.
Who is the Lafayette County building department, and how do you reach it?
Lafayette County Planning & Economic Development is the first stop for building permits, zoning compliance, land splits, county septic permits and floodplain development permits in unincorporated Lafayette County11. Call 660-259-4439 or email [email protected]; office hours are Monday through Friday, 8:30 a.m. to 4:30 p.m.11. Permit meetings are by appointment, and applicants should call before submitting anything so staff can identify the correct application and fee511. The office is at 1001 Main Street, Lexington, MO 6406713. If the parcel is inside city limits, contact that city hall because county planning only handles unincorporated land213.
Does Lafayette County have zoning?
Yes. Lafayette County voters adopted zoning, and Planning & Economic Development administers land-use rules in unincorporated parts of the county2. The county publishes a Land Development Code and map materials, but the planning page does not establish that every linked map remains current14. Ask staff to confirm the parcel's current district and permitted uses before relying on a map. Land divisions are regulated through applications such as farm splits, boundary-line adjustments, minor subdivisions and plats15. Current setback, minimum-lot-size, building-height, lot-coverage and minimum-dwelling-size figures could not be confirmed from the accessible county pages, so ask Planning & Economic Development for the standards tied to the specific parcel and proposed use13.
How do septic permits work in Lafayette County?
Lafayette County Planning & Economic Development regulates private sewage systems on unincorporated parcels of 25 acres or less3. The Lafayette County Health Department regulates private systems in towns without their own sewage codes and systems serving commercial or public buildings in unincorporated areas4. Public sewage systems and large lagoons go to the Missouri Department of Natural Resources16. New systems and major modifications or repairs under county authority require permits and inspections67. County planning lists $375 for on-site septic service including two inspections and $100 for each additional inspection17. Only 13.4% of mapped county soils lack severe limitations for a conventional drain field, so make the site evaluation an early contingency18.
Can you live in an RV or tiny home on your land in Lafayette County?
We could not confirm a county rule allowing or prohibiting long-term RV living, temporary camping or tiny-home occupancy on unincorporated land. Lafayette County zoning applies to unincorporated parcels, so ask Planning & Economic Development whether the proposed dwelling type and occupancy are allowed in the parcel's district2. The county fee schedule lists a temporary accessory dwelling permit with a one-year term and a $300 fee, but that listing does not establish that an RV or tiny home qualifies19. Manufactured homes are identified as projects likely to need floodplain review when placed in or near mapped flood-prone land, but that does not answer their general zoning eligibility10.
Building a home in Lafayette County: the steps, in order
- Call Planning & Economic Development at 660-259-4439 to confirm that the parcel is unincorporated, identify its zoning district and schedule the required appointment115.
- Ask the office to screen the site for floodplain constraints; approval must come before development begins in or near mapped flood-prone land10.
- Route the septic application to the correct authority based on the parcel and project, and complete the required permit and inspection process347.
- Submit the building application and pay only after staff confirms the applicable fee; permits are issued by appointment5.
- Obtain a MoDOT permit if the driveway construction or modification enters state right-of-way20.
What should you check before buying land in Lafayette County?
Confirm zoning, legal access, floodplain status and septic jurisdiction before the inspection period ends. Lafayette County requires approval before work begins in or near a mapped floodplain, including listed projects such as homes, grading, fill, accessory structures, driveways and culverts10. A driveway or culvert connected with flood-prone land is also likely to require county floodplain review21. Conventional septic suitability deserves special attention because only 13.4% of mapped soils lack severe drain-field limitations18. Typical farmland value is about $7,328 per acre, while the median property-tax bill is about $1,534 per year; use those only as countywide context, not a parcel quote2223. The nearest city of 100,000 or more is about 30 miles from the county center24.
Watch-outs
- County permits are issued by appointment, and required fees must be paid before an application is accepted as complete; wait for staff's payment instructions5.
- We could not confirm Lafayette County's adopted building-code edition, building-inspection schedule or certificate-of-occupancy rule; ask Planning & Economic Development before finalizing plans11.
- Do not assume that a parcel larger than 25 acres automatically goes to the Health Department; ask county planning and the Health Department which authority covers the particular system34.
Sources
- Applications, Permits, and Fees, quoted and re-checked
- Planning & Economic Development, quoted and re-checked
- Sewage System, quoted and re-checked
- Sewage System, quoted and re-checked
- Applications, Permits, and Fees, quoted and re-checked
- Sewage System, quoted and re-checked
- Sewage System, quoted and re-checked
- Planning & Economic Development (2026 county census)
- (2026 county census)
- Floodplain Management, quoted and re-checked
- Lafayette County Planning & Economic Development (lafayettecountymo.gov)
- RSMo Section 64.003 — Farm buildings and farm structures (Missouri statewide rule), quoted and re-checked
- Lafayette County Planning & Economic Development (lafayettecountymo.gov)
- Planning & Economic Development, quoted and re-checked
- Planning & Economic Development, quoted and re-checked
- Sewage System, quoted and re-checked
- Applications, Permits, and Fees, quoted and re-checked
- Share of soils without severe limits for a conventional septic drain field (USDA SSURGO): Bolthole Index county data
- Applications, Permits, and Fees, quoted and re-checked
- Permits | Missouri Department of Transportation (Missouri statewide rule), quoted and re-checked
- Floodplain Management, quoted and re-checked
- Farmland value per acre (USDA census): Bolthole Index county data
- Median property tax bill: Bolthole Index county data
- Distance to the nearest metro area: Bolthole Index county data
Written September 27, 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.