ADU Rules in Manhattan, Kansas

Manhattan (the "Little Apple") is a Riley County city of about 54,000 in north-central Kansas at the confluence of the Kansas (Kaw) and Blue rivers, home to Kansas State University (K-State) with about 22,000 students. Adjacent Fort Riley Military Reservation is also a major presence. Kansas has no statewide ADU preemption law — Manhattan's local zoning governs.

Manhattan Zoning Regulations

The City of Manhattan Zoning Regulations govern all land use. Manhattan has university-adjacent neighborhoods with strong rental demand and newer suburban development.

Permitted ADU Types

Depending on the zoning district:

• Accessory apartments: Conversion within primary structure
• Detached accessory dwelling units: In rear yards of eligible zones

Verify current ADU provisions with Manhattan's Community Development Division.

Size Limits

Accessory dwelling units are subject to:

• Maximum floor area per zone
• Lot coverage restrictions

Verify current limits with Manhattan Community Development.

Setbacks

Per Manhattan residential zone (typical):

• Rear: Minimum setback
• Side: Minimum setback
• Accessory structures: Per regulations

Kansas and Blue River Floodplain

Manhattan is at the confluence of the Kansas and Blue rivers — both historically flood-prone. Parts of Manhattan are in FEMA flood zones. The Tuttle Creek Lake reservoir upstream provides some flood control. Verify flood map status for any riverside or low-lying properties.

Fort Riley Area Note

Fort Riley Military Reservation is adjacent to Manhattan. On-base housing follows DoD rules; off-base civilian properties in Manhattan use Manhattan's zoning code.

Rental Registration

Manhattan may have rental property registration requirements. Verify with Community Development if planning to rent the ADU.

Permit Process

1. Verify zoning: Manhattan Community Development Division
2. Check flood zone status: Critical near Kansas and Blue rivers
3. Submit plans: Manhattan Building Inspection Division
4. Building permit and inspections
5. CO: Required before occupancy

Contact

City of Manhattan Community Development Division 1101 Poyntz Avenue, Manhattan, KS 66502 Phone: (785) 587-2400 Website: cityofmhk.com

Disclaimer: Kansas has no statewide ADU law. Manhattan zoning governs locally. River flood zones are significant. Verify current ADU allowances with the City of Manhattan before starting any project.