Accessory Structures in Olathe, KS (2026)
2 verified accessory structures rules for Olathe, Kansas, sourced directly from the municipal code and official government pages.
Verified from official government sources
ADU Rules
Olathe allows one accessory dwelling unit per lot in residential, downtown, and planned districts, capped at 1,000 square feet or half the main house's floor area, with a building permit only.
Olathe Accessory Dwelling Unit Rules
Some RestrictionsOlathe Unified Development Ordinance § 18.50.025.C.5, D.1
ADUs must not exceed a gross floor area of one thousand (1,000) square feet or more than fifty (50) percent of the principal structure's floor area, whichever is less, or have more than two (2) bedrooms. ... An ADU requires a building permit only and a separate administrative review is not required.
Shed & Carport Rules
Olathe caps detached sheds at 210 to 400 square feet by lot size and keeps them at least 5 feet from rear or side lines, 15 feet on a corner lot.
Olathe Shed Size and Setback Rules
Some RestrictionsOlathe Unified Development Ordinance § 18.50.060.D.1-2
Maximum size of a shed is based on lot area, as follows: a. For lots under seven thousand (7,000) square feet: Two hundred ten (210) square feet, ... c. For lots exceeding thirteen thousand (13,000) square feet: Four hundred (400) square feet. ... Sheds may not be located within five (5) feet of rear or side property lines or fifteen (15) feet of a corner lot property line.
Looking for Johnson County county-wide rules?
County ordinances apply to unincorporated areas and may supplement Olathe city rules.
Accessory Structures in Johnson County →