Tennessee ADU Laws

Complete 2026 guide to accessory dwelling unit regulations

○Local Control Only

📋Quick Facts

Max Size
1,200 sq ft
Size Limit
40% of primary
Owner Occupancy
May be required
Parking
Set locally
Approval Process
Varies locally

📜Recent Legislation

Nashville DADU ordinance (2014) - Detached ADUs in duplex-zoned areas

Hamilton County ADU Resolution 924-23 (September 2024) - Comprehensive ADU regulations

Hamilton County Resolution 1224-33 (December 2024) - Updated ADU provisions

⚠️Key Requirements & Restrictions

  • •No statewide ADU law - entirely local control
  • •Rules vary dramatically by city and county
  • •Owner-occupancy required in most jurisdictions
  • •Nashville DADUs restricted to duplex-zoned areas within Urban Services District
  • •Many areas require minimum 1-acre lot size
  • •STRs prohibited in Nashville DADUs

📖Detailed Analysis

No statewide ADU law - entirely local control. Nashville pioneered with DADU ordinance in 2014 allowing detached units in duplex-zoned areas within Urban Services District. Nashville rules: max 700-850 sqft depending on lot size, cannot exceed main house footprint, owner-occupancy required, STRs prohibited. Memphis/Shelby County has size/parking/setback requirements. Knoxville allows up to 1,200 sqft or 40% of main dwelling. Hamilton County (Chattanooga) passed comprehensive ADU regulations in September 2024 requiring owner-occupancy. Most jurisdictions require owner-occupancy and minimum lot sizes (often 1 acre). Growing interest but highly fragmented regulatory landscape - must check specific municipal/county rules.

🔗Official Resources

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⚠️ Disclaimer

The information provided on this website is for general informational purposes only and does not constitute legal, financial, or professional advice. ADU laws, regulations, and requirements vary by jurisdiction and change frequently. While we strive to keep this information accurate and up-to-date, we make no representations or warranties of any kind about the completeness, accuracy, reliability, or suitability of this information. Always consult with qualified local professionals, including attorneys, architects, and your local planning department, before making any decisions regarding ADU construction or investment. Use of this information is at your own risk.

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Last updated: February 2026