Garage conversion rules in Rutherford County, TN — sometimes called garage-to-ADU or accessory living unit conversions — govern permits, ceiling height, egress, and parking replacement.
Converting a detached garage or accessory building into living space in unincorporated Rutherford County is treated as creating an accessory dwelling unit. It is allowed only where the structure meets the current adopted residential building code, plus ADU covenant, lot-size, and permit rules under Section 1101 Q.
The Rutherford County Zoning Ordinance does not have a stand-alone garage-conversion rule; turning a detached garage or accessory structure into habitable space falls under the ADU standards of Section 1101 Q. A detached ADU may be established within an existing, legally established accessory structure only if that structure meets the current adopted building code for residential structures in Rutherford County, and it must provide at least the 300-square-foot minimum dwelling area required by the building code. The one-acre minimum, owner-occupancy covenant, off-street parking, and septic/utility verification for ADUs all apply. A zoning-compliance certificate and a building permit from the Rutherford County Building Codes Department are required. Inside city limits, Murfreesboro, Smyrna, and La Vergne apply their own zoning and building
An unpermitted conversion that creates an unapproved dwelling unit is a zoning violation and a misdemeanor fined as prescribed by Tennessee statutes; approval can be revoked and occupancy ordered to cease until the space is legalized or the kitchen removed.
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