Riley County, Kansas requires a building permit for construction, reconstruction, remodeling, relocation, additions and changes of use, with limited exemptions1. Unincorporated Riley County has no adopted county building code, and the county does not inspect construction methods; zoning, septic and driveway requirements 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
- Required for new private systems and administered by Riley County Environmental Health78
- Residential lot size
- District-specific: SF-1, SF-2 and SF-3 have different minimums910
- Owner-builder
- No general county exemption confirmed; state exemption covers qualifying owner-performed roofing only11
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 October 5, 2026.
Off-grid gear
Going off-grid in Riley County means bringing your own water and power. The kit we’d start with:
- Water Crystal Quest Filter any source — well, rain, or creek — to drinking-clean.
- Power Bluetti Solar generators and home battery backup for living off the grid.
- Septic Soil percolation test kit Run your own perc test before paying an engineer — the first thing a septic office asks about.
- Water Well water test kit Bacteria, nitrates, hardness — know what the well on a parcel is really pumping.
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Do you need a building permit in Riley County, Kansas?
Yes. 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. Unincorporated Riley County has not adopted a county building code, but state code review still applies to certain project and occupancy categories212. The county permit checks zoning, setbacks, Sanitary Code compliance and similar basics rather than construction methods133. Municipal building-code rules may differ inside city limits6.
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 Manhattan14. The county publishes applications for building permits, manufactured homes, site-built, modular and shouse dwellings, floodplain development, private wells, wastewater systems and short-term rentals15. A residential principal structure or residential addition or accessory structure has a $150 building-permit fee; the comparable commercial or industrial fee is $22516. Starting work before issuance doubles the fee, and applying simultaneously for a principal and accessory structure adds $50 above the principal-structure fee1718. Riley County does not inspect construction methods, so arrange appropriate independent construction oversight3.
Does Riley County have zoning?
Riley County zoning regulates land uses throughout the unincorporated county, while incorporated cities administer their own rules56. The county publishes three single-family residential districts, and lot size, setbacks and building height depend on the district101920. The parcel designation matters: SF-1 requires 2 acres, SF-2 requires 10,000 square feet, and SF-3 requires 6,500 square feet unless the Sanitary Code requires otherwise9. The Land Development Regulations also govern subdivisions21. Agricultural uses are exempt from those regulations, but sanitation, floodplain, driveway and state requirements may still apply22.
How do septic permits work in Riley County?
Riley County Planning & Development administers private wastewater systems in the unincorporated county7. A private system cannot be built, repaired, modified or operated without county approval and a permit, and the property owner or licensed installer starts with a profile and site-evaluation application and fee823. A private system within 400 feet of an existing public sewer is allowed only when the county finds connection is not reasonably feasible and the system can meet the Sanitary Code24. Only 1.4% of Riley County soils are rated without severe limits for a conventional drain field, so obtain the site evaluation before assuming a standard field will work25. New, repaired or modified systems require county inspection; standard tanks must be pumped and inspected at least every 5 years, while active alternative systems require annual inspection26.
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 permitted or conditional uses510. Setbacks and height restrictions also depend on the district and structure1920. We could not confirm a specific county rule for year-round RV living, temporary camping, tiny-home occupancy or minimum dwelling floor area; ask Riley County Planning & Development at 785-537-6332 for a written parcel determination14. Manufactured homes have a clearer path: outside a mobile-home park, a manufactured home must sit on a permanent foundation and obtain a building permit27. A recreational vehicle cannot serve as sleeping quarters for an unincorporated-county short-term rental28. Off-grid sanitation is not unrestricted: private systems need approval before use, and a privy served by public or pressurized water requires special county permission29.
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 restriction1491920.
- Resolve subdivision or rezoning needs and obtain a floodplain development permit before building in the floodplain2130.
- 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 fee823.
- Obtain a county drilling permit before drilling a Type I or Type II private water-supply well31.
- Submit the correct building application before starting work, then arrange independent construction oversight because Riley County does not inspect construction methods13.
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 incorporated cities administer their own rules6. Resolve subdivision requirements before dividing land, then verify access because new residential development in the unincorporated county must meet driveway standards unless it is an agricultural use214. A floodplain development permit is required before building in the floodplain30. Budget for septic carefully because only 1.4% of Riley County soils are rated without severe limits for a conventional drain field25. Also determine whether public sewer lies within 400 feet, and obtain a drilling permit before drilling a Type I or Type II private water-supply well2431. If rental income matters, an unincorporated-county short-term rental needs a county license and cannot use a recreational vehicle as sleeping quarters28.
Watch-outs
- Unincorporated Riley County has no adopted county building code and does not inspect construction methods through its building-permit program, but state code review still applies to certain project and occupancy categories2312.
- Starting construction before Riley County issues the building permit doubles the permit fee17.
- 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 design25.
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 Sanitary Code, quoted and re-checked
- Riley County Sanitary Code, quoted and re-checked
- Planning Division, quoted and re-checked
- Planning Division, quoted and re-checked
- K.S.A. 50-6,129. Exemptions (Kansas statewide rule), quoted and re-checked
- Kansas Building Energy Codes (Kansas statewide rule), quoted and re-checked
- Do I need a permit to build a structure in the unincorporated area?, 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
- Building Division, 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
- Planning Division, quoted and re-checked
- Riley County Planning & Development / Environmental Health (Septic Permits) (rileycountyks.gov)
- Riley County Sanitary Code, quoted and re-checked
- Share of soils USDA rates "not limited" for a conventional septic drain field (SSURGO). A strict rating: the median county is about 6% and a tenth of counties are 0%, so a low figure means most lots need a site evaluation or an engineered system, not that septic is impossible. Cite it only with that caveat: Bolthole Index county data
- Riley County Sanitary Code, quoted and re-checked
- Building Division, quoted and re-checked
- Short-Term Rental Regulations, quoted and re-checked
- Riley County Sanitary Code, quoted and re-checked
- Floodplain Information, quoted and re-checked
- Riley County Sanitary Code, quoted and re-checked
Written October 5, 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.