Can I Build ADU in Kansas City, MO? (2026)
Find out if you can build a adu in Kansas City, MO. Rules, permit requirements, costs, and next steps.
Yes, ADUs are allowed in Kansas City, MO. California state law ensures by-right approval.
An Accessory Dwelling Unit (ADU) is a secondary housing unit on a residential lot — also called a granny flat, in-law suite, or backyard cottage. In Kansas City, MO, ADUs are permitted by right under state law, making them one of the most accessible ways to add housing on your property. ADUs can be detached, attached to the main home, or created by converting an existing garage or accessory structure.
ADU Rules in Kansas City
ADU Rules in Kansas City: Detached ADU max size: 1000 sq ft. Attached ADU max size: 800. Setbacks: 3 ft side, 5 ft rear. Owner-occupancy: 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..
Costs & Fees
ADU permits in Kansas City: Total estimated permit cost: $1,200-$5,500 total permit fees. Contact the Kansas City Permits and Development Center for current fee schedule.
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.
Next Steps
Next steps for building an ADU in Kansas City: 1. Review full ADU rules including size limits, setbacks, and parking. 2. Apply for an ADU permit through the Kansas City Permits and Development Center at https://kcmo.gov/permits/online-permits. 3. Hire a licensed contractor familiar with MO ADU requirements.
Kansas City Permits and Development Center
Phone: (816) 513-1500
Website: https://kcmo.gov/permits
Online Permits: https://kcmo.gov/permits/online-permits
Frequently Asked Questions
Is Kansas City, MO the same as Kansas City, KS?
No — these are two separate cities in two different states. Kansas City, Missouri (KCMO) is in Jackson County, Missouri and is the larger city with approximately 508,000 residents. Kansas City, Kansas (KCK) is in Wyandotte County, Kansas and is a separate municipality. They share a metropolitan area but have completely different city governments, zoning codes, building departments, and permit offices. This page covers Kansas City, Missouri only. For Kansas City, Kansas, contact the Unified Government of Wyandotte County/Kansas City, Kansas.
Can I build an ADU (accessory dwelling unit) in Kansas City, MO?
Yes. Kansas City's Zoning and Development Code (Chapter 88) allows ADUs in residential zones. Detached ADUs are limited to 1,000 sqft and must be located in the rear yard. No owner-occupancy is required. One additional parking space is typically required unless the property is near a transit corridor. Contact the Kansas City Permits and Development Center at (816) 513-1500 or use the PermitKC portal to start your application.
What permits does Kansas City require for a home addition?
A building permit from the Kansas City Permits Center is required for all structural additions. Submit applications through the PermitKC online portal. You'll need site plans, construction drawings, property ownership documentation, and a completed permit application. Fees are based on construction value. Review takes approximately 3-6 weeks. Inspections are required at foundation, framing, electrical, plumbing, and final stages.
Does Kansas City have special rules for short-term rentals in neighborhoods like Crossroads or River Market?
STR rules are citywide — Kansas City requires a Short-Term Rental Registration ($75/year) for all rentals of 30 consecutive days or fewer. Crossroads Arts District and River Market are popular Airbnb and VRBO locations. Both hosted (room rental with owner present) and non-hosted (whole-home) rentals are permitted with registration. Contact the Kansas City City Clerk's office for current registration requirements.
What are Kansas City's zoning rules for home-based businesses?
Kansas City allows home occupations without a separate permit in residential zones. Rules include: no exterior signage, no customers on premises in R-1 through R-3 zones, no non-resident employees, and no more than 25% of floor area used for business. Missouri's Cottage Food Law allows home-based food production with up to $50,000 annual revenue without a permit. Contact Kansas City Planning at (816) 513-2555 for specific use questions.
Source: Kansas City Permits and Development Center — Building Regulations. Last verified April 6, 2026. View source