ADU Rules in Kansas City, MO (2026)
ADU rules, permit requirements, size limits, and fees for Kansas City, MO. Source-cited from official municipal code.
Whether ADUs are allowed in Kansas City, MO has not been confirmed — see the official source before proceeding.
Whether Kansas City, MO 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 (816) 513-1500 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 Kansas City: 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 Kansas City: 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 | $150-$800 |
| Building Permit | Based on construction value — typically $1,000-$4,500 |
| Impact Fees | None |
| School Fees | None |
| Total Estimate | See official source |
Permit Timeline
Kansas City 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: (816) 513-1500.
Setback Requirements
ADU Setback Requirements in Kansas City: 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
- ADU must comply with Kansas City Building Code habitability standards
- Detached ADU located in rear yard behind principal structure
- Maximum lot coverage not to be exceeded
- Historic Preservation overlay zones (Pendleton Heights, Westside, Valentine) require HDC review
- Flood plain overlay may restrict construction in FEMA-designated areas
- Kansas City Fire Code requirements apply — smoke detectors, egress windows
How Many ADUs Are Allowed?
Number of ADUs Allowed in Kansas City: Single-family lots: not confirmed — see official source. Multifamily properties: not confirmed — see official source.
- Single-Family Lots
- 1 ADU per lot
- Multifamily Properties
- ADU rules on multifamily parcels handled through site plan review
Statewide Preemption
ADU Preemption
We could not confirm a statewide ADU preemption statute for Missouri.
View Missouri preemption detailsFrequently Asked Questions
Can I build an ADU in Kansas City?
Yes. Kansas City, MO allows accessory dwelling units. On a single-family lot you can build 1 ADU per lot.
How big can an ADU be in Kansas City?
The maximum size for a detached ADU in Kansas City is 1,000 square feet.
How long does it take to get an ADU permit in Kansas City?
The typical ADU permit timeline in Kansas City is Kansas City Permits and Development Center: typically 4-8 weeks for ADU plan review. Construction 3-9 months. Kansas City's permitting has improved significantly through the PermitKC online portal.. Total estimated permit fees are $1,200-$5,500 total permit fees.
Do I need extra parking for an ADU in Kansas City?
Kansas City parking rules for ADUs: One parking space required per ADU. Kansas City's auto-dependent urban form means most properties can accommodate on-site parking. ADU parking requirement may be waived in transit-corridor overlay zones along the Prospect MAX and Troost MAX BRT routes.
Do I have to live on-site to have an ADU in Kansas City?
Owner-occupancy requirement in Kansas City: No owner-occupancy requirement under Kansas City Zoning and Development Code. Kansas City's investor-friendly real estate market allows non-owner-occupied ADU rentals.
Source: Kansas City Zoning and Development Code (Chapter 88); Kansas City Building Code. Last verified April 6, 2026. View source