Which authority should you contact?
Identify the municipality or unincorporated county that has jurisdiction over the property. Then ask its planning staff about the proposed use and its building staff about construction requirements. Sewer, water, utility and private covenant questions may involve other parties. Keep these reviews separate in your notes so an answer to one question is not mistaken for approval of everything.
For example, permission to add a bathroom does not establish permission for a second dwelling. A utility's willingness to connect service does not establish that a detached residence fits the zoning. An HOA response does not replace a building permit. Write down the exact question, the person's role and the date of the answer.
What is the KCMO starting point?
KCMO's adopted 2023 ordinance provides a useful baseline for the ADU discussion. It includes owner occupancy and a recorded restriction, permits attached or detached configurations, and applies different placement rules. For detached units, its stated height, footprint, floor-area and setback limits all matter together. Confirm the current code and how it applies to your parcel before using those limits in design. Read the adopted ordinance.
A useful planning question is: “What is the maximum buildable envelope for an ADU on this parcel after all applicable restrictions are applied?” That is more informative than asking whether the city allows an 800-square-foot unit. Even when one numerical limit sounds suitable, another site or building standard can control the actual result.
The city's information bulletin index lists IB170 for ADUs and IB100 for one- and two-family plan submissions. Request the current documents and a project-specific submission checklist. This guide does not certify a parcel or reproduce the entire code.
What changes on the Kansas side?
Kansas's 2026 SB418 establishes a by-right process for qualifying housing development, including ADUs, that meets its definitions and zoning and land-use criteria. It also preserves restrictive covenants and association rules. It is not a blanket approval for every backyard suite. Ask the municipality how the law applies to the proposed project and what constitutes a complete application. Read the enacted legislation.
Do not transplant a KCMO rule into Overland Park, Olathe, Lenexa or another Kansas city. Likewise, a published standard from one Kansas neighborhood or zoning district may not apply to another property. Begin with the parcel's district and intended use, then record the applicable process. This launch guide deliberately does not assign unverified citywide dimensional rules to those municipalities.
What should go into your first inquiry?
| Bring | Explain | Ask |
|---|---|---|
| Parcel address and site sketch | Location relative to house and lot lines | Who has jurisdiction and which district applies? |
| Room and equipment list | Cooking, sleeping, bathing and laundry | What use classification applies? |
| Entrance and household description | Independent or shared living arrangement | What occupancy conditions must be documented? |
| Existing-condition photographs | Basement, garage, utility and access conditions | Which drawings and technical reviews are required? |
| Survey or recorded restrictions, if available | Easements and private review questions | What else must be resolved before design is finalized? |
How do you turn an answer into a usable project record?
Create a decision log with four columns: issue, authority, answer and next action. Attach written responses or a dated note of the conversation. If a response is conditional, preserve the condition. “Likely possible after plan review” is not the same as “approved.” Give the same record to your designer and bidder so a later proposal does not silently substitute a different use.
When the concept changes, identify whether the earlier answer still applies. Adding cooking facilities, relocating an entrance or changing the size of a detached structure can be material. Ask before assuming that a prior conversation covers the revision. Keep approved documents and later changes together throughout construction.
What should remain unresolved until a professional review?
Structural adequacy, detailed life-safety design, utility capacity and a permit-ready site plan need their appropriate review. This page helps organize those questions; it is not a legal opinion or permit determination. Use the project planner to list uncertainties, then return to the complete planning guide to compare the physical options.
Sources & further reading
Primary references used for this guide. Confirm current requirements and property-specific applicability with the responsible authority.