ADU Rules in Greenville, Mississippi

Greenville is the Washington County seat with a population of approximately 28,000, located in the Mississippi Delta directly on the Mississippi River. The Delta is one of the most historically significant agricultural and cultural regions in the United States, known for its blues music heritage and the legacy of the cotton economy. Greenville is protected from Mississippi River flooding by a major levee system. Mississippi has no statewide ADU law — all accessory dwelling unit rules are set by Greenville's local zoning ordinance.

Mississippi Statewide ADU Law

Mississippi has not enacted statewide ADU legislation. There is no state mandate requiring cities to permit ADUs or streamline approvals. Greenville's local zoning ordinance governs whether an ADU is permitted on your property, what size it can be, and what flood and levee-related standards apply.

Permitted ADU Types

Availability varies by zoning district — verify with the Planning Department:

• Detached ADU: A separate structure on the same lot as the primary dwelling
• Attached ADU: An addition to the primary home with its own entrance and living facilities
• Garage Conversion: Converting an existing detached garage to a dwelling unit
• Basement/Interior Conversion: Converting interior space to a separate dwelling unit

Zoning Districts and Eligibility

Greenville's zoning code governs land use across the city. Contact the Planning Department to confirm:

• Which zoning district your property falls in
• Whether ADUs are permitted by-right or require a conditional use permit in your district
• Minimum lot size for ADU eligibility

Size Limits

Contact the Greenville Planning Department for current ADU size standards applicable to your district and lot. Confirm maximum square footage or percentage-of-primary-dwelling limitations.

Setbacks

Greenville's setback requirements vary by zoning district. General residential standards in comparable Mississippi Delta cities include:

• Front setback: 25–30 feet minimum
• Side setback: 5–8 feet minimum
• Rear setback: 20–25 feet minimum

Accessory structures are commonly permitted with reduced rear and side setbacks. Confirm current accessory structure setback standards with the Planning Department.

Height Limits

• Primary residential structures: Typically 35 feet maximum in standard residential zones
• Accessory structures: Typically limited to 25 feet or the height of the primary structure, whichever is less
• Confirm current standards with the Planning Department

Mississippi River Flood Zones: Critical Considerations

Greenville's location in the Mississippi Delta creates significant flood risk from the Mississippi River. Key considerations:

Levee System

Greenville is protected by a major levee and flood control system managed in coordination with the U.S. Army Corps of Engineers. However:

• Not all properties may be within the levee protection area — verify your property's location relative to the levee system
• Levee certification status: FEMA flood map designations depend on whether the levee is certified. Check current levee certification status with the Army Corps and Planning Department
• Residual risk: Levees reduce but do not eliminate flood risk. Properties inside the levee can still face flooding from rainfall, interior drainage failures, or levee overtopping

FEMA Flood Zones

Even within the levee-protected area, FEMA flood maps designate flood zone status. Check your property at the FEMA Flood Map Service Center:

• AE zones: Detailed Base Flood Elevation — must elevate to or above BFE for new construction
• X zones: Minimal flood hazard — standard construction typically acceptable
• Properties outside the levee: May be in high-hazard AE or A zones with strict elevation requirements

Construction in Flood Zones

If your property is in a FEMA-designated flood zone:

• An Elevation Certificate may be required before permitting
• New construction must meet or exceed the Base Flood Elevation (BFE)
• Substantial improvement rule: If your ADU project costs 50% or more of the structure's market value, full flood compliance applies to the entire structure

Delta Agricultural Context

Greenville's surroundings are dominated by agricultural land. If your property is at the urban edge near agricultural land:

• Confirm zoning classification carefully — agricultural zoning may apply to some parcels
• Drainage and irrigation infrastructure in the area may affect site drainage planning for an ADU

Parking

Contact the Greenville Planning Department for ADU parking requirements in your zone.

Owner-Occupancy

Greenville may require owner-occupancy of the primary dwelling or the ADU. Confirm current requirements with the Planning Department.

Permit Process

1. Verify zoning: Contact the Planning Department to confirm your district and ADU eligibility
2. Flood zone and levee check: Use the FEMA Flood Map Service Center to identify your flood zone; ask the city about levee protection status for your property
3. Elevation certificate: Obtain or locate any existing elevation certificate for flood zone properties
4. Site plan: Prepare a site plan showing the ADU location, setbacks, and dimensions
5. Building permit application: Submit construction documents to the Planning/Building Department
6. Inspections: Schedule required inspections during construction
7. Certificate of Occupancy: Required before occupying the ADU

Contact

City of Greenville Planning Department 342 Main Street, Greenville, MS 38701 Website: greenvillems.org/departments/planning

Municipal Code: library.municode.com/ms/greenville

Disclaimer: Mississippi has no statewide ADU law. This guide provides general information about ADU rules in Greenville and should not be relied upon as legal or regulatory advice. Mississippi River flood zones and levee system status are critical factors — always verify current flood zone designations and levee certification with the City of Greenville Planning Department and the U.S. Army Corps of Engineers before making any development decisions.