Accessory Structures in Columbia, MO (2026)
3 verified accessory structures rules for Columbia, Missouri, sourced directly from the municipal code and official government pages.
Verified from official government sources
ADU Rules
Columbia, Missouri allows one accessory dwelling unit per single-family lot in the R-2 and R-MF districts by right, and by conditional permit in R-1, capped at 800 square feet.
Columbia, MO Accessory Dwelling Unit Rules
Some RestrictionsColumbia Code of Ordinances § 29-3.3(gg)(3)-(4)
(3)A detached accessory dwelling shall be located a minimum of ten (10) feet behind the principal dwelling, and a minimum of six (6) feet from any side or rear lot line....(4)An accessory dwelling shall not exceed seventy-five (75) percent of the total square feet of the principal dwelling, as shown in the Boone County Assessor's records, or eight hundred (800) square feet, whichever is less.
ADU Rental Restrictions
Columbia, Missouri allows an ADU to operate as a short-term rental only if just one dwelling on the property is registered.
Columbia, MO ADU Short-Term Rental Limit
Some RestrictionsColumbia Code of Ordinances § 29-3.3(vv)(2)(xii)
Accessory dwelling unit (ADU) usage. An ADU may be permitted to be utilized as a short-term rental subject to compliance with the provisions of this subsection (vv) and all other applicable provisions of this Code, provided not more than one (1) dwelling unit upon the property is registered for use as a short-term rental. (xiii) Signage. One (1) non-illuminated building-mounted sign no greate...
Shed & Carport Rules
In Columbia, Missouri, detached carports and other accessory structures on one- and two-family lots must sit behind the house, at least 3 feet from side lines, and stand no taller than 24 feet.
Columbia, Missouri Carport Setback Rules
Some RestrictionsColumbia Code of Ordinances § 29-3.3(ii)(2)
Detached accessory structures shall not exceed twenty-four (24) feet in height or the height of the principal structure, whichever is less, and may not occupy more than thirty (30) percent of a required rear yard; (ii) For any dwelling there shall be permitted one garage with space for not more than one motor vehicle for each two thousand (2,000) square feet of lot area, provided that total g...
Looking for Boone County county-wide rules?
County ordinances apply to unincorporated areas and may supplement Columbia city rules.
Accessory Structures in Boone County →