Kentucky ADU Rules Law: Statewide Accessory Structures Rules (2026)

Key Facts

Code basis: Kentucky Residential Code
Statute: KRS Chapter 198B
Statewide ADU mandate: None imposed
Local zoning: Permits or prohibits

Full Breakdown

Kentucky has no statewide statute mandating that local governments allow accessory dwelling units, leaving siting and density decisions to local zoning under KRS Chapter 100 planning and zoning enabling law. However, when a city or county does permit ADUs, construction must comply uniformly with the Kentucky Residential Code under KRS Chapter 198B, which is mandatory statewide and cannot be weakened locally. ADUs require permits, full code compliance for habitable space, separate egress, smoke and carbon monoxide alarms, and energy code conformance. Detached ADUs may require separate utility services, while attached or interior ADUs share the principal dwelling's systems subject to capacity review.

Violations & Penalties

Unpermitted ADU construction triggers stop-work orders and fines; non-conforming units may face removal demands or denied certificate of occupancy.

Frequently Asked Questions

Does Kentucky require cities to allow ADUs?

No. Kentucky has no statewide statute mandating ADU permission. Local zoning under KRS Chapter 100 determines whether accessory dwelling units are allowed and under what conditions.

What construction standards apply to a Kentucky ADU?

The Kentucky Residential Code applies uniformly to ADUs statewide, including egress, ceiling height, smoke alarms, and energy code requirements enforced through local building officials.

Kentucky ADU Building Code Statewide Construction Standards