The Community Development Department is requesting public input on a potential code revision to allow for Accessory Dwelling Units (ADUs) within R-2 and higher density residential zoning classifications. An accessory dwelling unit (ADU) is a secondary dwelling unit created on a lot with a principal one-family dwelling, and is subordinate to the principal dwelling. Accessory dwellings may be attached to the principal dwelling, or built as a detached structure. An example of an attached ADU may be a basement apartment; a detached example would be a unit above a detached garage.
Current Zoning Regulations limit R-1 lots to a single one-family dwelling. R-2 lots are allowed to have a single two-family dwelling, but are restricted from having detached second dwellings. The R-3 and R-4 districts allow multiple dwelling units and structures to be situated on a single lot, meaning that ADUs are already permitted within these districts. A single-family dwelling is allowed on any R-1, R-2, or R-3 zoned lot containing at least 5,000 sq. ft. (See Table 1: Minimum Dwelling Density Standards by District). In addition to maximum density restrictions in each district (i.e., minimum lot area/unit), requirements such as setbacks, parking, minimum unit floor areas and maximum building heights may further restrict the number of dwelling units that can be accommodated on a site.
On November 19, 2012, City Council asked staff to prepare an amendment to the Zoning Regulations (Chapter 29 of the City Code) to accommodate accessory dwelling units (ADUs) within residential districts (Council Tracker #3770). Community Development Department staff has worked with the Planning and Zoning Commission to develop a preliminary discussion draft for the public to review (see Opportunities to Provide Public Input below to review and comment upon the draft). Following public input and listening sessions in the winter of 2014, any draft ordinance revisions will be subject to a public hearing by both the Planning and Zoning Commission and the City Council.
The City of Columbia is committed to ensuring that citizen input figures prominently throughout all planning processes. The following opportunities will be provided for public participation in the ADU ordinance revision process:
Contact Community Development Department Staff via Phone, Mail or Email
Community Development Department staff is available to answer any questions you may have, and is always looking for comments and input during all planning processes and throughout the year. Please contact us at (573) 874-7239 or send us an emailwith your planning/community development comments and questions. You may also send written comments to: Community Development Department, PO Box 6015, Columbia, MO 65205.
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