Unincorporated Leavenworth County, Kansas requires a building permit for most residential, accessory, and commercial structures, with an exception for structures smaller than 200 square feet1. The county has adopted building codes but removed the ordinary building-inspection and certificate-of-occupancy requirements234. Planning & Zoning also administers county zoning and publishes the district rules that control parcel uses, lot sizes, and setbacks5678.
At a glance
- Building permit
- Required for most structures; structures under 200 sq ft and several listed projects are exempt1
- Building inspections
- Ordinary county building-code inspections are not required; lowest-floor elevation provisions remain3
- Certificate of occupancy
- Not required under the county's adopted residential or commercial building codes4
- Zoning
- County zoning covers unincorporated land; cities apply their own rules59
- Septic
- Resale inspection required for systems serving habitable structures; confirm new-system steps with Planning & Zoning1011
- Driveway / entrance permit
- A county entrance permit costs $150 (partly refundable) and lasts 120 days, unless bundled into a home's building permit12
- Agricultural exemption
- Kansas exempts qualifying agricultural land and buildings from zoning, but not homes, garages, road setbacks, or floodplain rules13
Who to call
Planning & zoning
Leavenworth County Planning & Zoning Department
Zoning, building permits, septic (sanitary code) permitting, and floodplain administration for unincorporated Leavenworth County
300 Walnut Street, Suite 212, Leavenworth, KS 66048
Building permits
Leavenworth County Planning & Zoning Department - Building Permits
Building permit applications, review, and issuance for unincorporated Leavenworth County
Septic permits
Leavenworth County Planning & Zoning Department - Septic (Sanitary Code)
Septic permit issuance, resale inspections, and sanitary code enforcement for unincorporated Leavenworth County
Floodplain permits
Leavenworth County Planning & Zoning Department - Floodplain Administration
Floodplain development permits for unincorporated Leavenworth County
Roads & driveways
Leavenworth County entrance (driveway) permit process
Entrance (driveway) permits onto county roads for unincorporated Leavenworth County
Roads & driveways
Leavenworth County Public Works Department
County road and bridge maintenance and entrance-permit inspection for Leavenworth County
300 Walnut St., Suite 007, Leavenworth, KS 66048
Contact details are copied from each office’s official page and were checked against it on September 29, 2026.
Do you need a building permit in Leavenworth County, Kansas?
Leavenworth County requires a building permit for residential, accessory, and commercial structures in the unincorporated county, but structures smaller than 200 square feet are not regulated1. Roofing, roof-mounted solar panels, same-footprint deck replacements, unenclosed carports, and interior modifications are also listed as projects that do not require a permit1. The county adopted amended versions of the International Residential Code and International Building Code for new residential and commercial construction2. Even so, the adopted code removes the ordinary building-inspection sections except for lowest-floor elevation provisions, and it removes the residential and commercial certificate-of-occupancy sections34. A permit remains valid for one year after issuance1.
Who issues Leavenworth County building permits, and how do you reach them?
Leavenworth County Planning & Zoning handles building-permit applications for the unincorporated county1. Reach the department at [email protected] or (913) 684-0465, or visit the second floor of the county courthouse at 300 Walnut Street, Suite 212, Leavenworth, KS 6604811. Applications may be delivered in person, emailed, or sent through the online application; review begins after all required documents and payment are provided14. The county says a complete application generally takes 5–10 business days to process14. The applicant must be on the deed or submit an owner-authorization form14. Inside city limits, contact that city's planning department because the county department regulates only unincorporated Leavenworth County9.
Does Leavenworth County have zoning?
Leavenworth County applies zoning throughout the unincorporated county, while incorporated cities use their own planning rules59. The county publishes an interactive zoning map and directs owners to its Table of Uses for what each district allows or prohibits6. Minimum lot area and setbacks depend on the parcel's county zoning district, so identify the district before positioning a house, outbuilding, or driveway78. Subdivision regulations also control how property may be divided, including plats, lot or tract splits, and boundary-line adjustments15. Kansas exempts qualifying agricultural land and buildings from county zoning only while they are used for agricultural purposes; the exemption does not cover dwellings or garages and does not remove public-road setback or floodplain rules13.
How do septic permits work in Leavenworth County?
Leavenworth County requires a resale inspection of the onsite sewage system serving every habitable structure, including standard septic systems and lagoons10. The county's public material does not fully state the application and inspection sequence for a new system, so ask Planning & Zoning what must be approved before excavation11. Parcels smaller than 2.5 acres require an engineered waste-disposal system, and larger parcels may require one where soils are poor16. A lagoon is considered only when a lateral-field or alternative system is not possible and the tract has at least five acres and 300 feet of road frontage; the tract then cannot be subdivided further16. Only 3.1% of county soils are rated without severe limitations for a conventional drain field, so evaluate soils before setting a purchase budget17. Kansas prohibits seepage pits, cesspools, dry wells, and surface discharge from private onsite wastewater systems18.
Can you live in an RV or tiny home on your land in Leavenworth County?
We could not confirm a county rule that allows full-time RV or tiny-home occupancy on private land in Leavenworth County; ask Planning & Zoning about the parcel's district and proposed use before buying11. The county's published Table of Uses controls what is allowed in each unincorporated zoning district6. A site-built tiny home is not automatically permit-free: residential structures generally require a building permit, while the small-structure exception applies only below 200 square feet1. We also could not confirm a countywide minimum dwelling size, manufactured-home occupancy rule, temporary-camping rule, or accessory-dwelling standard. Planning & Zoning can match the proposed structure and occupancy to the parcel's district, setbacks, and minimum lot area7811.
Building a home in Leavenworth County: the steps, in order
- Find the parcel on the county zoning map, then check its allowed uses, lot area, and setbacks678.
- Ask Planning & Zoning to confirm whether a proposed split or boundary change needs subdivision review1511.
- Assemble the building-permit documents and owner authorization if the applicant is not on the deed14.
- Submit the complete application and payment in person, by email, or online; allow 5–10 business days for the county's stated processing window14.
- Confirm the new-system wastewater steps with Planning & Zoning before excavation, and plan for an engineered system on a parcel smaller than 2.5 acres or where soils are poor1116.
- Obtain a county-road entrance permit when required, or a Kansas highway permit before work in state right-of-way1219.
- Obtain a floodplain development permit before work in a mapped county flood zone20.
What to check before you buy land in Leavenworth County
Ask Planning & Zoning whether the parcel needs a local water-well permit, because Kansas requirements vary by county and Leavenworth County's specific rule could not be confirmed2111. Check acreage and soils together: parcels smaller than 2.5 acres require an engineered waste-disposal system, and poor soil may trigger the same result on a larger parcel16. Check the county flood map before choosing a building site because mapped areas require a floodplain development permit, including for a manufactured home20. Confirm whether access is from a county road or state highway; the county entrance permit costs $150, including a $100 refundable bond, while work in state highway right-of-way needs state approval1219. For carrying costs, the typical home value is about $355,416, the median annual property-tax bill is about $3,136, and the effective property-tax rate is about 1.2%222324.
Watch-outs
- A county building permit does not lead to ordinary building-code inspections or a county certificate of occupancy under the adopted code, so arrange any lender, insurer, or private inspection requirements separately34.
- We could not confirm that an RV, tiny home, manufactured home, or accessory dwelling may be occupied on a particular parcel; ask Planning & Zoning to check the zoning district and proposed use611.
- Only 3.1% of Leavenworth County soils are rated without severe limits for a conventional drain field, and parcels smaller than 2.5 acres require an engineered system1716.
Sources
- Building Permit Information, quoted and re-checked
- Formal meeting agenda — Resolution 2020-39 Building Codes Adoption, quoted and re-checked
- Formal meeting agenda — Resolution 2020-39 Building Codes Adoption, quoted and re-checked
- Formal meeting agenda — Resolution 2020-39 Building Codes Adoption, quoted and re-checked
- Regulations & Zoning, quoted and re-checked
- Regulations & Zoning, quoted and re-checked
- Regulations & Zoning, quoted and re-checked
- Regulations & Zoning, quoted and re-checked
- Regulations & Zoning, quoted and re-checked
- Septic Information, quoted and re-checked
- Leavenworth County Planning & Zoning Department (leavenworthcounty.gov)
- Leavenworth County entrance (driveway) permit process (leavenworthcounty.gov)
- K.S.A. 12-758 — Agricultural land exempted from zoning regulations (Kansas statewide rule), quoted and re-checked
- Building Permit Information, quoted and re-checked
- Regulations & Zoning, quoted and re-checked
- Leavenworth County Planning & Zoning Department - Septic (Sanitary Code) (leavenworthcounty.gov)
- Share of soils without severe limits for a conventional septic drain field (USDA SSURGO): Bolthole Index county data
- MF2214 Minimum Standards for Design and Construction of Onsite Wastewater Systems (Kansas statewide rule), quoted and re-checked
- Kansas Administrative Regulations, Volume 3 (Kansas statewide rule), quoted and re-checked
- Leavenworth County Planning & Zoning Department - Floodplain Administration (leavenworthcounty.gov)
- Water Well County Permits (Kansas statewide rule), quoted and re-checked
- Typical home value (Zillow): Bolthole Index county data
- Median property tax bill: Bolthole Index county data
- Effective property tax rate: Bolthole Index county data
Written September 29, 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.