South Texas Built.
Government Trusted.
Sullivan Contracting Services delivers large-scale commercial construction across South Texas — from military installations to university campuses. Trusted partners since day one.
Rooted in Texas.
Built on Trust.
Sullivan Contracting Services has been a cornerstone of South Texas commercial construction for over two decades. What started as a family commitment to quality craftsmanship has grown into one of the region's most trusted general contractors — with 50+ skilled professionals and four offices serving clients from Seguin to San Antonio and beyond.
We specialize in projects that matter: military installations that protect our servicemembers, university buildings that educate our future, and commercial infrastructure that drives Texas forward. Every project carries our name — and we take that personally.
Integrity
Honest bids, transparent timelines, zero surprises.
Safety
OSHA-compliant culture from office to jobsite.
Excellence
Built right the first time. Every time.
Full-Spectrum Construction Services
From pre-construction planning through final punch list, Sullivan Contracting delivers complete construction solutions for the most demanding projects in South Texas.
Commercial Construction
Ground-up construction of retail centers, office buildings, warehouses, and mixed-use facilities throughout South Texas.
Government & Military
Cleared for military installations and federal facilities. Experienced with government procurement processes and security requirements.
Education & University
Academic buildings, student housing, athletic facilities, and campus infrastructure for Texas universities and school districts.
Infrastructure
Roads, bridges, utilities, drainage systems, and site development supporting critical public and private infrastructure.
Renovation & Retrofit
Modernization of existing structures, tenant improvements, ADA compliance upgrades, and adaptive reuse projects.
Project Management
Full-service construction management, design-build coordination, pre-construction planning, and cost estimation services.
Work That Speaks for Itself
A selection of recent projects demonstrating our range and commitment to excellence across every sector we serve.
Government / MilitaryJoint Base San Antonio — Facility Expansion
Multi-phase facility expansion at JBSA including new administrative buildings, secured perimeter infrastructure, and utility upgrades. Completed on time within federal compliance requirements.
Education / UniversityTexas State University — Science Building
New-build STEM research and teaching facility with state-of-the-art laboratory spaces, lecture halls, and collaborative learning environments.
CommercialSeguin Town Center — Mixed-Use Development
Ground-up mixed-use development featuring retail, office, and restaurant spaces. Includes structured parking and public plaza areas.
InfrastructureGuadalupe County Infrastructure Upgrade
Comprehensive water and wastewater infrastructure improvements including new pump stations, pipeline replacement, and stormwater management systems.
Regional Reach, Local Roots
Four strategically located offices across the I-35 corridor, ensuring we're always close to your project site.
Seguin
Headquarters
1200 E. Court Street, Seguin, TX 78155
(830) 555-0100
San Antonio
Regional Office
4500 Fredericksburg Rd, San Antonio, TX 78201
(210) 555-0200
New Braunfels
Branch Office
780 S. Seguin Ave, New Braunfels, TX 78130
(830) 555-0300
San Marcos
Branch Office
215 E. Hopkins St, San Marcos, TX 78666
(512) 555-0400
Let's Build
Together.
Whether you're planning a new facility, need government-cleared contractors, or want a reliable partner for your next project — we're ready to talk.
Phone
(830) 555-0100
info@sullivancontracting.com
Main Office
1200 E. Court Street
Seguin, TX 78155
Request a Proposal
Tell us about your project and we'll follow up within 24 hours.