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Rankin County, MS Accessory Structures: ADU Rules (2026)

Significant Restrictions

Compiled from the official code textEditor Martyn O'NeillLast verified September 2026

ADU rules in Rankin County, MS, also called accessory dwelling unit regulations or granny flat ordinances, cover setbacks, owner-occupancy, parking, and permit requirements.

Key Facts

Limit: one ADU per parcel
Construction type: must be site-built
Wastewater permit: required from Health Dept.
Size: must be smaller than main house
Approval: conditional use, Board review

ADU Eligibility Quick-Check

An Accessory Dwelling Unit (ADU) is a smaller, independent living unit on the same lot as a single-family home: converted garages, detached cottages, basement or attic conversions, and attached additions all qualify. Most states have streamlined ADU permitting since 2020, but local rules still control size, height, and setback.

Is your lot zoned single-family or multi-family residential?
Does your lot have at least 1,200 sq ft of buildable space?
Is your existing home owner-occupied (in most states this is not required, but some require it for ADU permits)?
Will the ADU stay under your state's size cap (commonly 850-1,200 sq ft for detached)?
Can you provide one off-street parking space (waived in many states within 0.5 mi of transit)?

If you answered 'yes' to most of these, you likely qualify in Mississippi under recent ADU streamlining laws. The Rankin County, MS rules below cover local size, height, and setback requirements.

Summary

Rankin County allows one accessory dwelling unit per parcel as a conditional use in certain residential and agricultural zones, but it must be site-built, smaller than the main house, and permitted by the Health Department.

These county ordinances apply to unincorporated areas of Rankin County. Incorporated cities within the county may have their own rules that take precedence over county-level regulations.

401.06 Accessory Dwelling Unit: A secondary dwelling unit may be considered as a conditional use in certain residential and agricultural districts; however, there may be only one such structure per parcel, which must be site built, conformed to the building code and permitting process as adopted by the Board of Supervisors, receive a wastewater permit from the Department of Health, and be smaller than the primary dwelling. All dimensional regulations set forth in the applicable zoning district as well as Section 401.5 are applicable.

View official code

Official source re-checked September 7, 2026: the cited page had not changed since it was quoted.

Full Breakdown

Section 401.06 treats a secondary dwelling unit as a conditional use available only in certain residential and agricultural districts, capped at one structure per parcel. The unit must be site-built (not a manufactured or modular home), comply with the building code and permitting process adopted by the Board of Supervisors, receive a wastewater permit from the Mississippi Department of Health, and be smaller than the primary dwelling. It must also meet all dimensional standards of its underlying zoning district plus the general accessory-structure setback in Section 401.05. This applies only in unincorporated Rankin County, not in Brandon, Pearl, Flowood, Richland, Florence, Puckett, or Star.

Violations & Fines

Building or occupying an accessory dwelling unit without conditional-use approval, a building permit, or a Health Department wastewater permit is a misdemeanor under Miss. Code §17-1-27, punishable by a fine up to $1,000, up to one year in jail, or both.

Frequently Asked Questions

Can I add a mobile home as an ADU in Rankin County?

No. Section 401.06 requires the accessory dwelling unit to be site-built, and it must be smaller than the primary residence.

Is an ADU allowed by right in Rankin County?

No. It's a conditional use requiring Board of Supervisors approval, a building permit, and a wastewater permit from the Mississippi Department of Health.

Sources & Official References

[1]Rankin County Zoning Ordinance (2004, amended 2024) — Art. IV, §401.06

Other rules in Rankin County

Parking Rules: Overnight ParkingSome Restrictions Parking Rules: Street Parking LimitsSignificant Restrictions Shed & Carport RulesSome Restrictions Parking Rules: RV & Boat ParkingSome Restrictions Parking Rules: Commercial & Oversized VehiclesSome Restrictions Parking Rules: Abandoned VehiclesSome Restrictions Parking Rules: Driveway RulesSome Restrictions

All Rankin County rules

How Rankin County compares: Easiest Cities to Build an ADU·Compare Rankin County to another location·View the Mississippi accessory structures overview

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