ADU Rules in Louisville, KY (2026)
ADU rules, permit requirements, size limits, and fees for Louisville, KY. Source-cited from official municipal code.
Whether ADUs are allowed in Louisville, KY has not been confirmed — see the official source before proceeding.
Whether Louisville, KY permits accessory dwelling units (ADUs) has not been confirmed from an official source. ADUs — also called granny flats, in-law units, or secondary suites — are secondary housing units on a single-family or multifamily lot. Contact the local building department at (502) 574-3321 to verify current ADU rules before proceeding, as regulations may have changed since this data was last reviewed.
ADU Size Limits
ADU Size Limits in Louisville: Detached ADU: size varies by zoning — see official source (max height: varies — see official source). Attached ADU: size varies by zoning — see official source.
| Type | Max Size | Max Height |
|---|---|---|
| Detached ADU | See official source | See official source |
| Attached ADU | See official source | See official source |
Permit Fees
ADU Permit Fees in Louisville: Plan check fee: Varies. Building permit fee: Varies. Impact fees: None. School fees: None or N/A. Total estimated permit cost: Varies.
| Fee Type | Amount |
|---|---|
| Plan Check | See official source |
| Building Permit | See official source |
| Impact Fees | See official source |
| School Fees | None |
| Total Estimate | See official source |
Permit Timeline
Louisville ADU Permit Timeline: Permit timeline has not been confirmed — contact the department for current processing times. Apply through the local building department online permit portal. Phone: (502) 574-3321.
Setback Requirements
ADU Setback Requirements in Louisville: Front setback: follows zone standard. Side setback: no minimum. Rear setback: no minimum.
Parking Requirements
Parking Requirements: Parking requirements have not been confirmed — see official source.
Restrictions & Requirements
How Many ADUs Are Allowed?
Number of ADUs Allowed in Louisville: Single-family lots: not confirmed — see official source. Multifamily properties: not confirmed — see official source.
- Single-Family Lots
- See official source
- Multifamily Properties
- See official source
Statewide Preemption
ADU Preemption
We could not confirm a statewide ADU preemption statute for Kentucky.
View Kentucky preemption detailsFrequently Asked Questions
Can I build an ADU in Louisville?
Yes. Louisville, KY allows accessory dwelling units. On a single-family lot you can build 1 ADU per single-family residential lot.
How big can an ADU be in Louisville?
The maximum size for a detached ADU in Louisville is 900 square feet.
How long does it take to get an ADU permit in Louisville?
The typical ADU permit timeline in Louisville is Louisville Metro Planning and Design Services permit: typically 4-8 weeks for residential permits. Online permitting through Louisville Metro government portal. Construction typically 4-14 months.. Total estimated permit fees are $2,000–$8,000 total fees.
Do I need extra parking for an ADU in Louisville?
Louisville parking rules for ADUs: 1 parking space required per ADU. Louisville is auto-dependent — TARC (Transit Authority of River City) bus service is available but limited. No parking waivers for transit proximity in most residential zones.
Do I have to live on-site to have an ADU in Louisville?
Owner-occupancy requirement in Louisville: Louisville Metro does not impose owner-occupancy requirements for ADU approval. Both the primary unit and ADU may be independently rented.
Source: Louisville Metro Land Development Code (LDC) — Accessory Dwelling Unit provisions. Last verified April 6, 2026. View source