Can I Build Second Story Addition in Kansas City, MO? (2026)
Find out if you can build a second story addition in Kansas City, MO. Rules, permit requirements, costs, and next steps.
Adding a second story in Kansas City, MO is possible in most zones, subject to height limits and structural permit requirements.
A second story addition is one of the most complex home improvement projects in Kansas City, MO. It requires a full building permit, structural engineering review, and must comply with the height limits for your zoning district. Unlike a ground-floor addition, a second story changes the roofline and structural load path of your entire home, triggering stricter engineering requirements. In Kansas City, zone height limits range from varies feet in R-1 zones — verify your zone before planning.
Second Story Addition Rules in Kansas City
Second Story Addition Rules in Kansas City: Building permit required: Yes — all second story additions require a permit. Example height limit (R-1): varies feet. Structural engineering drawings required. Setbacks apply to the full structure height.
Costs & Fees
Contact the local building department for current permit fees. Budget separately for structural engineering.
Next Steps
Next steps for adding a second story in Kansas City: 1. Hire a structural engineer to assess your existing foundation and framing capacity. 2. Confirm your zone height limit and verify the addition meets all setback requirements. 3. Submit full structural plans and permit application to the local building department. 4. Inspections required at foundation reinforcement, framing, shear panels, and final.
Kansas City Permits and Development Center
Phone: (816) 513-1500 · Verified July 6, 2026 · Source
Website: https://kcmo.gov/city-hall/departments/city-planning-development
Online Permits: https://kcmo.gov/mykcmo
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