ADU Regulations in McKinney, Texas
Updated September 29, 2026
One of the fastest-growing cities in Collin County, McKinney evaluates ADU applications through its unified development code. Texas's lack of a statewide ADU mandate means all requirements are locally determined.
Below is a summary of the key zoning rules applicable to Accessory Dwelling Units in McKinney as of 2026. Regulations are governed by local zoning ordinances, as Texas has no statewide ADU mandate.
| Regulation | Requirement |
|---|---|
| Maximum Size | 1,000 sq ft |
| Property Setbacks | 5 ft rear, 5 ft side |
| Extra Parking Required | Required (1 space) |
| Owner Occupancy | Not required |
Additional Local Requirements for McKinney
- ADU allowed in residential zones per local ordinance
- Minimum 200 sq ft
- Building permit required
- ⚠️ TX has NO statewide ADU law — city code governs
📥 Download the Complete McKinney ADU Cheat Sheet
Get the step-by-step permit checklist, official government forms, direct planning department contacts, and estimated fees — all in one printable PDF for McKinney, Texas.
Download the Complete McKinney ADU Cheat Sheet — $14Frequently Asked Questions About ADUs in McKinney
Can I build an ADU in McKinney?
This Texas city permits ADUs under local ordinance. Verify your specific zoning district with the planning department before applying.
What is the maximum ADU size allowed in McKinney?
ADUs in McKinney can be up to 1,000 square feet, subject to the property's zoning and lot coverage limits. Always confirm the exact allowed size with the McKinney planning department before designing your project.
What are the setback requirements for an ADU in McKinney?
ADUs in McKinney generally require setbacks of 5 ft rear, 5 ft side. Texas has no statewide ADU mandate — the exact setback figures come from McKinney's own zoning code, so confirm them with the city planning department before you design.
Disclaimer: This guide summarises publicly available city zoning rules and is for general information only — it is not legal or architectural advice. Codes change; always confirm current requirements with the McKinney planning department before you design or build.