ADU Regulations in Plano, Texas
Updated September 29, 2026
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
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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.
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 are the setback requirements for an ADU in Plano?
ADUs in Plano generally require setbacks of 5 ft rear, 5 ft side. Texas has no statewide ADU mandate — the exact setback figures come from Plano'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 Plano planning department before you design or build.