ADU Rules in Waco, Texas

Overview

Waco is a Central Texas city of approximately 140,000 people on the Brazos River in McLennan County. Home to Baylor University (one of the largest Baptist universities in the world), Waco has experienced a significant neighborhood revitalization — accelerated in part by national attention from HGTV's Fixer Upper series featuring Chip and Joanna Gaines' Magnolia Market at the Silos. This attention has driven real estate investment, tourism, and short-term rental activity throughout Waco's residential neighborhoods.

Texas has no statewide ADU preemption law — local zoning governs. Waco's zoning ordinance (accessible through Municode) regulates ADUs as accessory uses in residential districts.

Zoning Framework

Waco's residential zoning districts range from SF-1 (low-density single-family) through medium and high-density residential zones. ADUs — referenced as accessory dwellings, guest houses, or secondary units in the ordinance — are addressed in the accessory use provisions of each residential district.

Typical ADU types addressed in Waco's ordinance:

• Detached guest houses: Separate structures at the rear or side of the primary residence
• Garage apartments: Habitable space above or within an accessory garage structure
• Attached secondary units: Additions or internal conversions connected to the primary dwelling
• Carriage houses: Common in Waco's older neighborhoods; conversion of historic carriage structures

Typical Development Standards

Waco's accessory dwelling unit standards for single-family districts generally include:

• Minimum lot size: A qualifying lot area (verify with Planning Services for your specific district)
• Maximum ADU size: Typically a percentage of primary dwelling size or a fixed cap; commonly 600–1,000 sq ft
• Rear setback: Approximately 5 ft from rear property line for accessory structures
• Side setback: Approximately 5 ft from side property line
• Height: One to one-and-a-half stories for most detached accessory structures
• Lot coverage: Combined coverage of all structures must remain within district maximums

Brazos River and Flood Hazard Areas

Waco's proximity to the Brazos River is both an asset and a significant flood risk factor. The Brazos, Waco Creek, Hog Creek, and other tributaries create extensive FEMA-mapped Special Flood Hazard Areas (SFHA) within the city. Key requirements for flood-zone properties:

• Floodplain development permit required from Waco Engineering Services for any new construction
• New structures must be elevated at or above Base Flood Elevation (BFE)
• Substantial improvements (generally 50%+ of structure market value) trigger full flood compliance
• Lake Waco (operated by the Army Corps of Engineers) has its own flood management zones and buffers

Check FEMA's Flood Map Service Center (msc.fema.gov) and Waco's Engineering Department for your parcel's flood zone.

Historic Districts and Magnolia-Adjacent Neighborhoods

Waco has locally designated historic districts and numerous historically significant structures, particularly in older neighborhoods such as Sanger Heights, Provident Heights, and near downtown. The wave of real estate investment connected to Magnolia Market has brought increased attention — and scrutiny — to neighborhood character in these areas.

New ADU construction in or adjacent to historic overlay areas may require:

• Design review for architectural compatibility
• Use of materials and styles appropriate to the historic character of the area
• Approval from Waco's Heritage Preservation Officer before building permit issuance

Permit Process

1. Verify zoning district and any historic overlay via Waco's online GIS portal
2. Check FEMA flood zone status for your parcel
3. Prepare site plan, floor plans, and elevations meeting zoning standards
4. Submit building permit application to Waco Building Services
5. Pay applicable fees; await plan review for zoning and building code compliance
6. Schedule required inspections through certificate of occupancy

Contact

• Waco Planning Services: wacotx.gov/departments/planning | 254-750-5650
• Waco Building Services: wacotx.gov/departments/building | 254-750-5660
• Waco Engineering (Floodplain): wacotx.gov/departments/engineering
• FEMA Flood Map Service Center: msc.fema.gov

Disclaimer: Waco's zoning regulations, historic district boundaries, and FEMA flood maps are subject to change. This page reflects general guidance as of the date noted. Always verify current ADU rules with Waco Planning Services and consult a licensed Texas professional before proceeding with construction.