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.
Yes, ADUs are allowed in Kansas City, MO.
Kansas City, MO permits accessory dwelling units (ADUs) on residential properties. ADUs — also called granny flats, in-law units, backyard cottages, or secondary suites — are secondary housing units on a single-family or multifamily lot. State and local law governs the approval process. In Kansas City, the Kansas City Permits and Development Center handles ADU permit applications. Below you will find the current size limits, setbacks, fees, and timeline for building an ADU in Kansas City.
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: $150-$800. Building permit fee: Based on construction value — typically $1,000-$4,500. 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: 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. Apply through the Kansas City Permits and Development Center 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: 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.
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: 1 ADU per lot. Multifamily properties: ADU rules on multifamily parcels handled through site plan review. Kansas City is notable for its bistate metro context — the city has coordination challenges for residents near state lines. KCMO zoning applies to all properties in Missouri within city limits.
- 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 detailsHistoric District Considerations
Historic District Requirements: Kansas City has 8 historic districts where additional design review may be required for ADU construction. Design review approval is required before obtaining a building permit for properties in historic overlay zones. Kansas City Historic Preservation Commission administers local historic landmarks and districts. Notable National Register Historic Districts include Pendleton Heights, Hyde Park, Westside, and Quality Hill. The city's Crossroads Arts District and River Market also have preservation interest. Certificate of Appropriateness or Landmark Notification required for exterior changes to designated properties. The Missouri State Historic Preservation Office (SHPO) handles federal tax credit nominations. Look up historic district boundaries at: https://kcmo.gov/city-hall/departments/city-planning-development
Frequently 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