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Rutherford County, TN Accessory Structures: ADU Rules (2026)

Some Restrictions

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

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

Key Facts

Governing rule: Zoning Ordinance Section 1101 Q
Minimum lot size: One (1) acre
ADUs per lot: One, single-family only
Owner occupancy: Six months per year
Detached setback: 5 ft side and rear

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 Tennessee under recent ADU streamlining laws. The Rutherford County, TN rules below cover local size, height, and setback requirements.

Summary

In unincorporated Rutherford County, an accessory dwelling unit (ADU) is allowed by-right in any residential district on a lot of at least one acre, with only one ADU per single-family lot. The owner must live in either the main house or the ADU.

City-specific rules exist: Murfreesboro has its own adu rules rules that differ from Rutherford County's county-level regulations. If you live in Murfreesboro, check the city-specific page instead.

ADUs are permitted in any residential zoning district in connection with any lawfully existing single family dwelling... The property owner must reside in either the principal structure or the ADU. Only one ADU is allowed per lot in conjunction with a single family house.

Source: Rutherford County ADU Application & InstructionsView official code

Full Breakdown

The Rutherford County Zoning Ordinance, Section 1101 Q, governs ADUs on unincorporated land (cities like Murfreesboro, Smyrna, and La Vergne set their own rules). ADUs are permitted in any residential district in connection with a lawfully existing single-family dwelling, and only one ADU is allowed per lot. By-right detached ADUs require a minimum of one acre and a 5-foot side and rear setback; attached ADUs are capped at the greater of 50% of the principal structure's floor area or 300 square feet. The property owner must occupy the principal dwelling or the ADU for at least six months a year, and a Declaration of Covenant must be recorded with the Register of Deeds. Zoning compliance ($250) precedes a building permit.

Violations & Fines

Violating the ADU covenant or Section 1101 Q revokes approval; occupancy must immediately cease and the owner must remove or legally reuse the added improvements. Zoning violations are misdemeanors fined as prescribed by Tennessee statutes.

Frequently Asked Questions

Can I build an ADU in unincorporated Rutherford County?

Yes, by-right in any residential district if you have at least one acre and only one ADU on the single-family lot. You must record a covenant and live in the house or the ADU.

Does the ADU have to match my house?

Yes. Section 1101 Q requires the ADU to be architecturally compatible with the principal residence, and any new outside entrance serving the ADU may not be visible from the right-of-way.

Sources & Official References

Other rules in Rutherford County

Noise Ordinances: Construction HoursSome Restrictions Shed & Carport RulesSome Restrictions Parking Rules: RV & Boat ParkingSome Restrictions Garage ConversionsSome Restrictions Tiny HomesSome Restrictions ADU Rental RestrictionsSignificant Restrictions ADU Owner OccupancySome Restrictions ADU Impact FeesSome Restrictions Noise Ordinances: Amplified Music & Outdoor SoundSome Restrictions Noise Ordinances: Decibel LimitsSome Restrictions Parking Rules: Loading ZonesSome Restrictions Fence Regulations: Material RestrictionsSome Restrictions

All Rutherford County rules

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

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ADU Rules in Cities Across Rutherford County

Murfreesboro, TN