ADU Rules in McAllen, Texas

Overview

McAllen is the retail and commercial center of the Rio Grande Valley, the southernmost metropolitan area in Texas. Located in Hidalgo County directly across from Reynosa, Mexico, McAllen has grown rapidly and remains one of the fastest-growing large cities in the United States. The subtropical climate, binational economy, and proximity to the US-Mexico border give McAllen a unique development context.

Texas has no statewide ADU preemption law — all regulations are set locally. McAllen's zoning ordinance (accessible through Municode) is the primary regulatory document governing accessory dwelling units.

Zoning Framework

McAllen uses a conventional zoning ordinance with residential districts ranging from single-family (R-1) to multi-family. ADUs — often referred to as accessory dwelling units, garage apartments, or guest houses in Texas municipal codes — are typically addressed in the accessory structures provisions of the residential chapters.

Permitted ADU types in most McAllen single-family residential districts generally include:

• Detached guest houses or garage apartments: Separate structures on the same lot as the primary residence
• Attached secondary suites: Additions or conversions attached to the main home
• Garage conversions: Converting an existing attached or detached garage to habitable space

Typical Development Standards

While exact figures should be verified with the Planning & Zoning Department, McAllen ADUs in R-1 and similar districts are subject to:

• Minimum lot size: A minimum lot area is generally required before an ADU is permitted; typically 7,500–10,000 sq ft or larger
• Maximum ADU size: Often capped as a percentage of the primary dwelling floor area or a fixed square footage (commonly 600–1,000 sq ft in comparable Texas cities)
• Setbacks: Rear and side setbacks of approximately 5 ft are typical for accessory structures; verify current requirements
• Height: Accessory structures are typically limited to one or one-and-a-half stories
• Owner-occupancy: Some McAllen residential districts require that the property owner reside on-site when renting an ADU; confirm with the city

Flood Zone Considerations: Rio Grande Valley

The Rio Grande Valley has significant flood risk. Hidalgo County and the city of McAllen contain FEMA-designated Special Flood Hazard Areas (SFHA) — particularly Zone AE — associated with the Rio Grande, its resacas (oxbow lakes), and the regional drainage network. Key flood-related requirements:

• Properties in SFHAs require a floodplain development permit from the McAllen Engineering Department
• New structures must be elevated to or above the Base Flood Elevation (BFE) shown on the Flood Insurance Rate Map (FIRM)
• Substantial improvements (generally costing 50% or more of the structure's value) trigger full compliance with current floodplain regulations
• FEMA Flood Map Service Center (msc.fema.gov) — search by address to find your zone

HOA and Deed Restriction Considerations

McAllen's newer master-planned subdivisions often have active homeowners associations with deed restrictions. These private restrictions can be more limiting than city zoning and may prohibit:

• Rental of any portion of the property
• Detached guest houses or additional dwelling units
• Exterior alterations visible from the street

Always obtain and review your subdivision's Declaration of Covenants, Conditions, and Restrictions (CC&Rs) before designing an ADU.

Permit Process

1. Confirm zoning district at McAllen's online GIS portal or by contacting the Planning & Zoning Department
2. Check FEMA flood zone status for your parcel
3. Review any deed restrictions or HOA rules
4. Submit a building permit application with site plan, floor plans, and elevations to the McAllen Building Department
5. Pay applicable permit fees; await plan review
6. Schedule required inspections (foundation, framing, MEP rough-ins, final)

Contact

• McAllen Planning & Zoning Department: mcallen.net/departments/planning-zoning | 956-681-3150
• McAllen Building Safety Department: mcallen.net/departments/building-safety
• FEMA Flood Map Service Center: msc.fema.gov

Disclaimer: Zoning regulations and flood maps change over time. This page reflects general guidance as of the date noted. Always verify current ADU rules with the City of McAllen Planning & Zoning Department and a licensed Texas professional before proceeding with any construction.