Are ADUs allowed in Katy TX?

ADU permissibility in Katy TX depends on your specific address and applicable jurisdiction. The City of Katy, Harris County, Fort Bend County, and Waller County all have different rules. Most Katy master-planned communities have HOA covenants that restrict or prohibit detached ADUs. Always verify zoning regulations and HOA rules before investing in ADU design.

How much does ADU construction cost in Katy TX?

ADU construction in Katy TX typically costs $40,000-$80,000 for a garage conversion, $95,000-$185,000 for an attached ADU addition, and $130,000-$260,000 for a new detached ADU. Costs vary based on size, finish level, site conditions, and whether the ADU requires a new foundation or can use an existing structure.

How long does it take to build an ADU in Katy TX?

A Katy TX ADU project takes 4-8 months from design through certificate of occupancy. HOA approval (if required) adds 4-8 weeks before permits can be pulled. Garage conversions are fastest at 2-4 months. New detached ADU construction takes 5-8 months depending on size and site complexity.

What is the rental income potential for an ADU in Katy TX?

Katy TX ADUs command strong rental rates due to Katy ISD schools, proximity to major employment, and high quality of life. ADU rental rates in Katy range from $1,100-$2,000 per month. A well-built unit can generate $13,200-$24,000 annually, typically paying back construction costs within 6-10 years.

Does MAV Design and Build build ADUs in Katy TX?

Yes. MAV Design and Build provides full-service ADU design and construction in Katy and the surrounding area. We navigate HOA approvals, county and city permits, and all construction phases. Call (832) 532-6829 for a free Katy TX ADU feasibility consultation.

MAV Design & Build

ADU Construction in Katy TX: Regulations, Costs & What to Expect (2026)

Name: MAV Design & Build
Address: 7055 Old Katy Rd Suite 506, Houston, TX, 77024, US
Telephone: (832) 532-6829

Katy TX is one of the most in-demand communities in the Houston metro, and ADU construction in Katy is gaining momentum as homeowners look to maximize property value and generate rental income on their existing lots. Whether you want to build a detached garage apartment, convert an existing garage, or add an attached in-law suite, understanding Katy ADU regulations is essential before you begin.

ADU Regulations in Katy TX

Katy TX straddles Fort Bend, Harris, and Waller counties, and the City of Katy has its own building jurisdiction for some areas. Key regulatory considerations:

ADU permissibility varies by zoning district and HOA covenants
Most Katy master-planned communities (Cinco Ranch, Grand Lakes, etc.) have HOA restrictions that may prohibit detached ADUs or require specific architectural standards
Lots without HOA restrictions in Katy generally allow ADUs subject to setback and lot coverage rules
Always verify both city/county zoning and HOA restrictions before designing an ADU

ADU Construction Costs in Katy TX

Garage conversion to ADU: $40,000–$80,000
Attached ADU addition: $95,000–$185,000
Detached ADU (new construction): $130,000–$260,000+

Rental Income Potential from Katy TX ADUs

Katy ADUs command premium rents due to the city’s top-rated schools (Katy ISD), strong job market, and excellent quality of life. Rental rates for ADUs in Katy typically range from $1,100–$2,000 per month depending on size, finish level, and amenities. The Katy school district premium makes ADUs particularly valuable for families wanting to rent near Katy High School or Seven Lakes High School attendance zones.

MAV Design & Build — ADU Construction in Katy TX

MAV Design & Build serves Katy and the surrounding communities with full-service ADU design and construction. We navigate both HOA requirements and county or city permits, delivering completed ADUs that meet local standards and your budget. Call (832) 532-6829 for a free Katy ADU consultation.