Kansas ADU Laws

Complete 2026 guide to accessory dwelling unit regulations

○Local Control Only

📋Quick Facts

Max Size
1,000 sq ft
Size Limit
50% of primary
Owner Occupancy
May be required
Parking
Set locally
Approval Process
Varies locally

⚠️Key Requirements & Restrictions

  • •No statewide ADU law - entirely local control
  • •Topeka allows ADUs as of August 5, 2024 in all single-family zones (R-1, R-2, R-3)
  • •Johnson County has administrative review process
  • •Olathe limits ADUs to 1,000 sqft or 50% of principal structure, max 2 bedrooms

📖Detailed Analysis

No statewide ADU law - entirely local control. Topeka passed ordinance allowing ADUs in all single-family zoning districts (R-1, R-2, R-3) as of August 5, 2024. Johnson County offers administrative review process for ADUs. Olathe municipal code limits ADUs to 1,000 sqft or 50% of principal structure, whichever is less, with maximum 2 bedrooms. Wichita recognizes various ADU types including detached and attached units. Rural areas and smaller municipalities may have more restrictive or unclear regulations. No statewide grants or incentives. Varies significantly by municipality - some allow by right, others require special permits or administrative review.

🔗Official Resources

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⚠️ Disclaimer

The information provided on this website is for general informational purposes only and does not constitute legal, financial, or professional advice. ADU laws, regulations, and requirements vary by jurisdiction and change frequently. While we strive to keep this information accurate and up-to-date, we make no representations or warranties of any kind about the completeness, accuracy, reliability, or suitability of this information. Always consult with qualified local professionals, including attorneys, architects, and your local planning department, before making any decisions regarding ADU construction or investment. Use of this information is at your own risk.

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Last updated: February 2026