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Southern California General Contractors

Structural Execution. Fleet Capacity. On Schedule.

ONBASE CONSTRUCTION, INC. delivers high-grade residential and commercial builds across Orange County and greater Los Angeles. We combine heavy-equipment fleet capability with transparent, on-schedule job site execution.

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Our Expertise

Built to Specification

From initial site prep to the final inspection, every project is executed to stamped engineering specs with direct oversight.

Ground-Up Builds

Structural Renovations

Commercial Contracting

Comprehensive general contracting for new residential and commercial structures, ensuring foundational integrity and timely completion.

Specializing in complex structural upgrades and renovations for existing properties, enhancing durability and compliance.

Reliable execution for commercial clients, including tenant improvements, industrial facilities, and multi-unit developments.

By the Numbers

Grounded in Performance

100%

Stamped Plan Compliance

20+

Heavy Equipment Fleet

0

Lost-Time Incidents (YTD)

Operational Rigor

Direct Oversight, Real Capacity

We maintain our own fleet of heavy equipment, ensuring project control and eliminating delays. Our site superintendents provide direct, daily oversight, guaranteeing every detail meets our exacting standards and your timeline.

Submit Plans for Bid

Ready to Build? Submit Your Plans.

Property owners, developers, and facilities managers: Send us your architectural plans. We provide accurate bids and transparent project execution for your next Southern California build.