ADU rules in Greene County, MO β also called accessory dwelling unit regulations or granny flat ordinances β cover setbacks, owner-occupancy, parking, and permit requirements.
Unincorporated Greene County is zoned under the Greene County Zoning Regulations (originally adopted December 26, 1978; amended), administered by the Resource Management Department's Planning and Zoning Office at 940 N. Boonville Ave, Room 306, Springfield (417-868-4005). The county's A-1 Agriculture District (Article V) and other residential districts permit accessory uses, but Missouri has no statewide ADU mandate, and a true detached second dwelling is typically reviewed as a secondary use that may require a conditional use permit. Properties inside the City of Springfield follow Springfield's separate Land Development Code.
Greene County exercises zoning authority over its unincorporated territory through the Greene County Zoning Regulations, first adopted by the County Commission on December 26, 1978 with subsequent amendments. The Planning and Zoning Office (within Resource Management) issues zoning determinations and conditional use permits. Article V governs the A-1 Agriculture District, which historically allows a wider range of accessory uses than the R-1 single-family residential district. Whether a detached accessory dwelling is permitted, permitted as a conditional use, or prohibited depends on the specific zoning district of the parcel; applicants should confirm with the Planning and Zoning Office before designing or starting construction. Building permits and code review (under the 2012 International Codes and 2011 National Electric Code adopted by the County, with amendments) are issued by the Building Regulations Office (417-868-4015). On-site wastewater capacity is reviewed under the Greene County Wastewater Standards when public sewer is not available, which often becomes the practical limit on adding a second dwelling. Missouri has not enacted a statewide ADU preemption statute, so the operative rules are the county zoning code (unincorporated) or the relevant city's code. Inside the City of Springfield, Springfield's Land Development Code governs; check Title 36 of the Springfield Code for ADU and accessory structure provisions.
Construction of a dwelling unit in violation of the Greene County Zoning Regulations is a zoning violation enforceable by the County through stop-work orders, removal orders, and civil action; Missouri counties may seek injunctive relief and fines under the zoning enabling statutes (RSMo Chapter 64). Building code violations under the adopted 2012 International Codes are enforced by the Building Regulations Office. Wastewater violations are addressed by Greene County Environmental Services. Always obtain a zoning verification and required permits before beginning work.
Greene County, MO
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