Contractors in California

Sidera Environmental, Inc. is an environmental consulting firm specializing in compliance services for industries, municipalities, and government entities. They assist with hazardous materials, waste management, and water-related concerns.

Siege Electric is a leading specialty electrical contractor in Southern California providing integrated infrastructure solutions for commercial and public/municipal industries.

Sierra Electric is a full-service electrical contractor providing electrical construction services throughout the United States, delivering innovative and sustainable solutions to clients.

Sierra Geotech is a materials testing, field inspections, geotechnical engineering and environmental permitting services firm.

Sierra Industrial, Inc. specializes in custom pipeline insulation for various applications including process piping, steam lines, and tanks.

Sierra Insulation Contractors, Inc. is a commercial and industrial insulation contractor established in 1997. They focus on providing value to customers while maintaining high ethical standards. They work on projects such as regional shopping centers, theaters, major distribution warehouses, and manufacturing plants.

Sierra Landscape Development is a landscape construction company focused on public works and commercial projects throughout Southern California.

Sierra Northern Railway is a short-line freight railroad company headquartered in West Sacramento, California, specializing in providing efficient and cost-effective transportation solutions, focusing on the movement of bulk commodities such as grain, petroleum products, forest products, and minerals.

Sierra Railroad is a pioneer in the energy, freight, and passenger rail industries. It operates in California since the 1800s, providing services that bridge history with sustainability, connectivity, innovation, and growth.

Sierra View General Contractor specializes in commercial construction projects including wineries, industrial facilities, office buildings, healthcare facilities, and retail spaces. They offer services from pre-construction to construction and facility management.

SigTel Inc. offers specialized copper splicing testing and repair services for federal, military, and secure telecom environments. They focus on OSP/ISP construction, fiber optic placing, splicing, testing, civil underground construction, bridge conduit attachments, electrical testing, maintenance & commissioning.

Sigma Contracting Group is a construction company that develops Residential, Commercial and Public Works Projects. They offer consulting, design, construction, and management services.

Significant Cleaning Services is a family-owned and operated commercial cleaning company serving the Greater Bay Area for over 35 years. They specialize in facility services for commercial properties.

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Simplex Construction Management, Inc. is a California-based consulting firm offering construction program management services.

Simplified Builders, INC. offers architectural designs, interior designs, project management, civil & MEP engineering. They are recognized for their contribution to regional community solutions.

Simpson Mechanical Inc. is a commercial plumbing and mechanical piping company serving the San Diego area. They offer a range of services including commercial repairs, tenant improvements, new construction projects, and green solutions.

Site Constructors, Inc. (SCI) is involved in the hydroelectric and wind power generation industries. They handle installation projects and maintenance and upgrade requirements. They offer EPC/BOP scope for WIND projects and Balance of Systems (BOS) for Solar Energy projects.

SiteBid is an infrastructure marketplace that helps property owners lease, manage, and sell their utility assets, streamlining utility lease and easement transactions for Utility Companies, Property Owners, and Investors.

Siterep Construction Services is dedicated to providing exceptional QA/QC services to the private, public, and utility construction industries. They provide professional inspectors that will ensure the utmost quality on projects.

Sky Crew Construction specializes in tension fabric structures.