ADU Regulations in Plano, Texas
In Collin County north of Dallas, Plano regulates ADUs through its unified development code. Texas has no statewide ADU mandate, so Plano's local zoning districts — including specific lot size and design standards — are the governing authority.
Below is a summary of the key zoning rules applicable to Accessory Dwelling Units in Plano 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 Plano
- 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 Plano ADU Cheat Sheet
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Can I build an ADU in Plano?
This Texas city permits ADUs under local ordinance. Verify your specific zoning district with the planning department before applying.
How big can my ADU be in Plano?
What is the maximum ADU size allowed in Plano? ADUs in Plano 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 Plano planning department before designing your project.
What about setbacks and other requirements in Plano?
What are the setback requirements for an ADU in Plano? ADUs in Plano generally require setbacks of 5 ft rear, 5 ft side. California state law (AB 68) limits local setback requirements to 4 feet for existing structures, but always verify with local zoning.
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