General Contractors need subcontractors they can trust to help deliver complex projects on time and on budget. Xcel Mechanical Systems works with some of the largest G.C.s in California. We maintain long-term relationships built on respect, communication and unsurpassed quality of work.

C.W. Driver

CW Driver is a premier builder serving the Western United States since 1919. The company’s distinguished history spans nearly a century. As leaders in General Contracting and Construction Management services, C.W. Driver remains on the cutting-edge across a broad spectrum of industries, including education, healthcare/biomedical, entertainment, retail, industrial and civic. Landmark projects, historical renovations, hospitality industry and occupied campus programs have distinguished us as leaders in our field.


McCarthy Building Companies is one of the nation’s oldest and largest commercial construction companies. Founded in 1864, the firm is currently the 12th largest builder in America (Engineering News-Record, May 2015). Throughout all phases of a project, from early integrated design phase services, through construction and after completion, McCarthy builders utilize industry-leading construction techniques and the most sophisticated technology tools to deliver the highest quality, jobsite safety and ultimately, the best value.

PCL Construction

We are more than builders. We are construction partners who are passionate about what we do and our partners’ success. We pride ourselves on being solution providers. A construction project is a balancing act of coordinating mechanical, electrical, and other subcontractors work packages, in a project team environment. PCL works closely with subcontractors early in the construction life cycle to understand how they intend to perform their work, and to develop construction execution plans that emphasize team success.

Pacific National Group

Pacific National Group is a high-end general contractor for large, established clients that have ongoing development and improvement projects in Southern California. Pacific National Group, a 100% employee-owned company, is recognized as the finest, most trusted and highly regarded company in its field. Pacific National Group is consistently ranked as one of the 25 Largest Commercial & Industrial Contractors in Los Angeles County by the Los Angeles Business Journal. With nearly 60 years of experience, Pacific National Group continues to build an extensive portfolio of work in highly specialized sectors of construction.

W.E. O’Neil

Established in 1925, W.E. O’Neil Construction Company has flourished into an award winning and nationally ranked industry leader. Our foundation is rooted in our people and our commitment to quality, integrity and responsiveness to our clients’ needs. Through four generations of O’Neil family leadership and 90 years of experience, the O’Neil name has been synonymous with quality professional construction services.