Accessory Structures in Wyandotte County, KS (2026)
3 rules for unincorporated Wyandotte County, Kansas.
Verified from official government sources
ADU Rules
Wyandotte County's Unified Government zoning code caps an accessory dwelling unit at half the finished square footage of the main house and bans placing one in the front yard. Sec. 27-340 ties the unit's size directly to the primary structure and requires the lot to keep its existing off-street parking count.
Wyandotte County ADU Size and Placement Limits
Some RestrictionsUnified Government of Wyandotte County/KCK Code § 27-340
Accessory dwelling unit means a dwelling unit that is located over a garage on the same lot or parcel as the primary residential building. Such unit can be attached or detached from the primary residential building. Such units are located towards the rear of the parcel or lot, but regardless shall not be located within the front yard. All accessory dwelling units shall have a maximum square foo...
ADU Owner Occupancy
Wyandotte County's zoning code defines a "primary" accessory dwelling unit as the one the property owner actually lives in, and only treats a property as owner-occupied if the owner is physically present at least 272 days a year and registers to vote and holds a driver's license at that address.
Wyandotte County ADU Owner-Occupancy Test
Some RestrictionsUnified Government of Wyandotte County/KCK Code § 27-340
Accessory dwelling unit, primary means the accessory dwelling unit that the property owner resides within that otherwise satisfies the definition of owner-occupied, as defined in this section. ... Actively owner-occupied means that the homeowner physically resides in the primary building on the subject property at least 272 days per year and has designated the subject property as both their leg...
Shed & Carport Rules
A detached storage shed, playhouse, or similar one-story accessory structure serving a one- or two-family home in Wyandotte County does not need a building permit as long as its floor area is 120 square feet or less. Larger sheds fall back under the standard permit process.
Wyandotte County Shed Permit Exemption Rule
Light RestrictionsUnified Government Code § 8-25 (2018 IBC § 124(a)(7))
Permits shall not be required for the following:(a)Building.(1)Retaining walls that are not over four feet (1,219 mm) in height... (7)One-story detached accessory structures associated with one- and two-family dwellings, used as tool and storage sheds, playhouses, and similar uses, provided the floor area does not exceed 120 square feet.(8)Fences not over six feet (1829 mm) high.
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