Unincorporated Riley County, Kansas requires a building permit for construction, reconstruction, remodeling, relocation, additions and changes of use, with limited exemptions1. Riley County has not adopted a building code and does not perform construction inspections through this permit program, but zoning, setbacks, septic and driveway rules still apply234.
At a glance
- Building permit
- Required for most construction and changes of use in unincorporated Riley County1
- Building code
- No county code adopted and no construction inspection through the permit program23
- Zoning
- County zoning applies throughout the unincorporated area; cities administer their own zoning56
- Septic permit
- Issued by Riley County Planning & Development / Environmental Health7
- Residential lot size
- District-specific: SF-1, SF-2 and SF-3 have different minimums89
- Agricultural uses
- Exempt from the Land Development Regulations, but other requirements may still apply10
Who to call
Building permits
Riley County Planning & Development (Building Permits)
Building permits, setback verification and building-permit FAQs for unincorporated Riley County
110 Courthouse Plaza, Manhattan, KS 66502
Zoning
Riley County Planning & Development
Zoning administration, comprehensive planning, rezoning and code/nuisance enforcement for unincorporated Riley County
110 Courthouse Plaza, 2nd Floor, Rm B212, Manhattan, KS 66502
Septic permits
Riley County Planning & Development / Environmental Health (Septic Permits)
Private wastewater (septic) system permitting, soil profile analysis and inspection for unincorporated Riley County
110 Courthouse Plaza, Manhattan, KS 66502
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 Riley County, Kansas?
Yes. Unincorporated Riley County requires a permit before construction, reconstruction, remodeling, relocation, an addition or a change of use1. A structure smaller than 49 square feet is exempt, as are structures on United States government land and structures owned by Kansas State University or the State of Kansas1. Riley County has not adopted a county building code, and the permit program does not inspect construction methods; the permit instead verifies zoning, setbacks, Sanitary Code compliance and other basic requirements23. Municipal rules may differ inside city limits2.
Who is the Riley County building department and how do you reach them?
Riley County Planning & Development handles building permits at 785-537-6332 and 110 Courthouse Plaza in Manhattan11. The county publishes applications for building permits, manufactured homes, site-built, modular and shouse dwellings, floodplain development, private wells, wastewater systems and short-term rentals12. A residential principal structure or residential addition or accessory structure has a $150 building-permit fee; the comparable commercial or industrial fee is $22513. Starting work before issuance doubles the fee, and applying simultaneously for a principal and accessory structure adds $50 above the principal-structure fee113.
Does Riley County have zoning?
Riley County zoning regulates land uses throughout the unincorporated county, while municipalities administer zoning inside their city limits56. The published districts control permitted and conditional uses, lot size, setbacks, height and floodplain development91415. Single-family districts illustrate why the parcel designation matters: SF-1 requires at least 2 acres, SF-2 requires 10,000 square feet, and SF-3 requires 6,500 square feet unless the Sanitary Code requires otherwise8. Riley County also regulates subdivision and land division in the unincorporated area under rules that vary by area16. Agricultural uses are exempt from the Land Development Regulations, but sanitary, floodplain, driveway and state requirements may still apply10.
How do septic permits work in Riley County?
Septic and other onsite wastewater systems in Riley County are permitted and inspected by the county's Environmental Health Division under the county-adopted Riley County Sanitary Code7. To start, the property owner or a licensed installer submits a profile/site evaluation application and fee to the Riley County Planning & Development Department, which schedules a soil analysis with an environmental health specialist17. Only 1.4% of Riley County's soils are rated free of severe limits for a conventional septic drain field under USDA soil survey data, so most properties should plan for a full site evaluation, and some will need a wastewater stabilization lagoon instead of a standard field if the soil profile doesn't qualify18. Statewide, Kansas bans surface discharge from any private onsite wastewater system and does not allow seepage pits, cesspools or dry wells as a substitute19.
Can you live in an RV or tiny home on your land in Riley County?
Riley County zoning applies throughout the unincorporated area, so an RV or tiny-home proposal must fit the parcel's zoning district and its permitted or conditional uses59. Setbacks and building-height restrictions also depend on the district and structure or use1415. We could not confirm a specific Riley County rule for year-round RV living, temporary camping, tiny-home occupancy or minimum dwelling floor area. Before buying for one of those uses, ask Riley County Planning & Development at 785-537-6332 for a written zoning determination for the parcel11.
Building a home in Riley County, Kansas: the steps, in order
- Ask Riley County Planning & Development at 785-537-6332 to identify the parcel's district, allowed use, lot-size standard, setbacks and height restriction1181415.
- Confirm whether a land division needs subdivision approval and whether floodplain review applies1612.
- Confirm driveway access before designing the site; new residential development in unincorporated Riley County must meet county access standards unless it is an agricultural use4.
- If public sewer is unavailable, submit the septic profile and site-evaluation application and fee to Planning & Development1720.
- Submit the applicable building, dwelling, well, wastewater and floodplain applications before starting work121.
- Arrange independent construction oversight because Riley County's permit program does not conduct construction inspections3.
What to check before you buy land in Riley County, Kansas
Confirm the jurisdiction and zoning district first because Riley County regulates the unincorporated area while cities administer their own zoning6. Check the recorded parcel boundaries and proposed division against the applicable subdivision rules, then verify access: new residential development in the unincorporated county must meet driveway standards unless it is an agricultural use164. Budget for septic carefully because only 1.4% of Riley County soils are rated without severe limits for a conventional drain field; obtain the county site evaluation before relying on a standard system1817. For a private well, Riley County publishes an application, and Kansas requires well logs for construction, reconstruction and plugging1221. The nearest city of 100,000 or more is about 64 miles from the county's center22.
Watch-outs
- Riley County has not adopted a building code and does not perform construction inspections through its building-permit program, so arrange your own construction oversight23.
- Starting construction before Riley County issues the building permit doubles the permit fee1.
- Only 1.4% of Riley County's soils are rated without severe limits for a conventional septic drain field, so obtain the site evaluation before committing to a system design18.
Sources
- Building Division, quoted and re-checked
- Riley County Frequently Asked Questions, quoted and re-checked
- Riley County Frequently Asked Questions, quoted and re-checked
- Regulations, Standards & Specifications, quoted and re-checked
- Planning Division, quoted and re-checked
- Regulations, Standards & Specifications, quoted and re-checked
- Riley County, KS - Wastewater Disposal Systems (2026 county census)
- Planning Division, quoted and re-checked
- Planning Division, quoted and re-checked
- Planning Division, quoted and re-checked
- Riley County Planning & Development (Building Permits) (rileycountyks.gov)
- Applications and Permits, quoted and re-checked
- Building Division, quoted and re-checked
- Planning Division, quoted and re-checked
- Planning Division, quoted and re-checked
- Regulations, Standards & Specifications, quoted and re-checked
- Riley County Planning & Development / Environmental Health (Septic Permits) (rileycountyks.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
- MF2214 Minimum Standards for Design and Construction of Onsite Wastewater Systems (Kansas statewide rule), quoted and re-checked
- Water Well County Permits (Kansas statewide rule), quoted and re-checked
- Distance to the nearest metro area: 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.