Rutherford County, TN Accessory Structures: ADU Owner Occupancy (2026)
Key Facts
- Owner-occupancy
- Owner must live in house or ADU
- ADU count per lot
- One, single-family lots only
- Duplex/multi-family lots
- ADUs not allowed
- Use restriction
- Recorded covenant required at register's office
- Existing ADUs
- Grandfathered under prior approval terms
Summary
In unincorporated Rutherford County, an accessory dwelling unit is not investment property: Zoning Ordinance § 1101 Q.1.a requires the property owner to actually live in either the main house or the ADU itself. Only one ADU is allowed per single-family lot, and duplexes or multi-family properties can't add one at all.
ADUs are permitted in any residential zoning district in connection with any lawfully existing single family dwelling. There are two (2) categories of ADUs: By-right and ADU's requiring Special Exception Permits.
1. General Provisions for ADUs
Applications for an ADU must meet certain conditions. In no case, shall an Application for an ADU request an amendment to the following requirements.
a. The property owner must reside in either the principal structure or the ADU.
b. Only one ADU is allowed per lot in conjunction with a single family house. ADUs are not allowed in conjunction with duplex or multi-family dwelling units.
Full Breakdown
4, required for mobile-home or tiny-home ADUs or whenever the by-right standards can't be met. c requires an instrument recorded with the register's office covenanting the accessory-dwelling status and its use conditions, so the restriction runs with the land through a future sale. g). 5 and stay regulated under their original approval terms.
Violations & Fines
Failing to meet the owner-occupancy condition in § 1101 Q.1.a, such as renting out both the principal home and the ADU to non-owner tenants, is enforced the same way as any other zoning violation. Under § 1410, a written complaint goes to the Director of Building Codes, each day of noncompliance is a separate offense, and the county can pursue an injunction or ask utilities to withhold service until the property conforms.
Frequently Asked Questions
Can I build an ADU on my Rutherford County property and rent out both units to tenants?
Can I add an ADU if my property already has a duplex?
What proves the ADU is legitimate once it's built?
Sources & Official References
Other rules in Rutherford County
Compare Rutherford County to another location·View the Tennessee accessory structures overview
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