Kentucky ADU Laws

Complete 2026 guide to accessory dwelling unit regulations

○Local Control Only

📋Quick Facts

Max Size
800 sq ft
Size Limit
75% of primary
Owner Occupancy
May be required
Parking
Set locally
Approval Process
Varies locally

📜Recent Legislation

HB 576 (2025) - Proposed statewide ADU mandate, would require ADUs as permitted use in all residential zones without additional local restrictions. Bill stalled/inactive.

⚠️Key Requirements & Restrictions

  • •No current statewide ADU law - entirely local control
  • •HB 576 (2025) proposed statewide mandate but currently stalled/inactive
  • •Louisville: 800 sqft minimum requirement
  • •Lexington: ADUs allowed citywide (Dec 7, 2023 ordinance)
  • •General pattern: 500-1000 sqft typical, 50-75% of primary dwelling max

📖Detailed Analysis

No current statewide ADU law - entirely local control. HB 576 (2025) proposed that 'at least one accessory dwelling unit be considered a permitted use in all residential zones and shall not be subject to permitting or review by local governing bodies' but bill stalled and remains inactive. Louisville requires minimum 800 sqft (unusual - most places set maximums). Lexington legalized ADUs citywide Dec 7, 2023 after multi-year process. General pattern across counties: ADUs typically 500-1000 sqft, 50-75% of primary dwelling maximum, 2ft side/5ft rear setbacks common. Louisville offers AARP Community Challenge Grant with free pre-approved ADU building plans. Kentucky follows 2018 International Residential Code including Appendix Q for tiny houses. If HB 576 eventually passes, would create statewide by-right ADUs with max $250 additional fee.

🔗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