Louisville, KY Accessory Structures: Garage Conversions (2026)
Garage conversion rules in Louisville, KY, sometimes called garage-to-ADU or accessory living unit conversions, govern permits, ceiling height, egress, and parking replacement.
Key Facts
- Governing section
- LDC § 4.3.27
- Max ADU size
- 800 sq ft or 30% of home
- ADUs per lot
- One, attached or detached
- Owner occupancy
- Required in one unit
- Short-term rental
- Not allowed
Summary
Louisville Metro lets you convert a garage into an accessory dwelling unit under LDC § 4.3.27, capped at 800 square feet with an owner-occupancy requirement.
One ADU, either attached or detached is permitted per single family dwelling per lot. ... Maximum ADU Size: 800 square feet or 30 percent of the gross floor area of the principal structure, whichever is greater. ... Detached ADUs which are separate accessory structures from the principal dwelling. Examples include converted garages or new construction.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: 2026 S-47: Supplement contains: Local legislation current through Ordinances passed by the Council and approved by the Mayor as of July 1, 2026).
Full Breakdown
Louisville Metro's Land Development Code treats a converted garage as a detached accessory dwelling unit (ADU) under § 4.3.27. You get one ADU per lot, capped at 800 square feet or 30% of the principal structure's floor area, whichever is greater. The detached ADU must meet accessory-structure setbacks, sit to the side or behind the house, and its entrance must face the principal structure or side yard. The property owner must live in either the main house or the converted unit, and the space can't be rented as a short-term rental. Off-street parking still has to meet Chapter 9 standards even after the garage is gone.
Violations & Fines
Converting a garage without approval, exceeding the 800-square-foot/30% cap, renting the ADU short-term, or the owner moving out of both units triggers a zoning or property-maintenance violation reviewed by Codes & Regulations, with unresolved violations blocking future ADU approval.
Frequently Asked Questions
Can I convert my garage into an apartment in Louisville?
Do I need to live on the property after converting my garage?
Can I rent out a converted garage on Airbnb in Louisville?
Sources & Official References
Other rules in Louisville
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