Jackson County, MO Accessory Structures: ADU Rules (2026)
ADU rules in Jackson County, MO, also called accessory dwelling unit regulations or granny flat ordinances, cover setbacks, owner-occupancy, parking, and permit requirements.
Key Facts
- Allowed districts
- AG and RR only
- Permit required
- Building permit before construction
- Structure type
- Must be permanent
- Utilities
- Public or code-compliant on-site water/sewer
- Scope
- Unincorporated county only
Summary
Unincorporated Jackson County allows an accessory dwelling unit only in the AG and RR zoning districts, and only with a building permit, under UDC § 24005.2.b.
b. Standards for Accessory Dwelling Units. A dwelling unit may be allowed as an accessory use to the principal dwelling unit under the following conditions:
1. Accessory dwelling units may be constructed only in AG and RR zoning districts;
2. The accessory dwelling unit may be constructed only upon the issuance of a building permit;
3. The accessory dwelling unit shall be a permanent structure.
4. Accessory dwelling units shall be considered independent buildable sites, and be connected to public water and sewer service where available or have on-site water and sewer facilities that comply with all County and State regulations;
#20326 Effective June 1, 1995 Exhibit 240.18: Zoning District Authorization for Particular Uses
District
Use AG RR RE RS RU RO LB GB HC LI HI A A Accessory Uses, Buildings, A A A A A A A A A Structures C C C C C
Full Breakdown
Jackson County's Unified Development Code treats an accessory dwelling unit as an accessory use to the principal dwelling under UDC § 24005.2.b. The unit is restricted to Agricultural (AG) and Rural Residential (RR) zoning districts, must be permanent construction, requires a building permit before it can be built, and counts as an independent buildable site, meaning it must connect to public water and sewer where available, or have on-site water and sewer facilities meeting County and State standards. This applies only in unincorporated Jackson County; Kansas City, Independence, Lee's Summit, Blue Springs, Raytown and Grandview enforce their own zoning codes and are not governed by this section.
Violations & Fines
Building without the required permit, or placing an ADU outside the AG/RR districts, is a zoning code violation subject to the County's standard UDC enforcement and building-permit remedies.
Frequently Asked Questions
Can I build an ADU anywhere in Jackson County?
Does this apply inside Kansas City?
Do I need a permit for an ADU?
Sources & Official References
Other rules in Jackson County
How Jackson County compares: Easiest Cities to Build an ADU·Compare Jackson County to another location·View the Missouri accessory structures overview
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