ADU rules in Kirkwood, MO — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
Kirkwood passed ADU-permitting zoning changes in 2021 under Chapter 25 (§25-45(b)). Minimum lot size is 15,000 sq ft. Detached ADUs must reflect the architectural style of the principal dwelling and meet principal building setback requirements. ADU accessory structures must not include cooking facilities, sleeping area, or bathing unless approved as an ADU.
§25-45(b): Accessory structures without ADU approval shall not include basement, cooking facilities, sleeping area, shower, or bathing facility. ADU-approved structures must be on the same lot as the principal use. 15,000 sq ft minimum lot size for ADUs. Architectural compatibility required — style, materials, colors, and roof design must match principal dwelling. Critics noted the 2021 ADU rules had restrictive requirements that resulted in few ADUs being built.
Unpermitted ADU: standard building code enforcement. May require demolition or legalization. Occupying unpermitted dwelling: code violation.
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