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Excellence in underground engineering since 1970. Specialties: storm drains, water, sewer, fire protection, natural gas, excavations and more.

Explore Company

Premium underground electrical systems that keep communities running. Specialties: public utilities, telecom, joint trenching, security and more.

Explore Company

Excellence in underground engineering since 1970. Specialties: storm drains, water, sewer, fire protection, natural gas, excavations and more.

Explore Company

Quality. Integrity. Service.

The Preston Companies bring extensive expertise and hands-on partnership to complex projects. Our services include excavating and installing underground wet and dry utilities, soils testing and management, and fill site management.

About Preston

For Our Partners

We take pride in the partnerships we have the privilege of working alongside.

Our in-house accounting and management teams work around the clock to make certain all of our information stays current as well as the information for our vendors. We want to ensure our projects can run on time and efficiently.

Document Library

Document Name Description Last Updated
Master Purchase Order Agreement Contract for all projects for which Buyer engages Vendor. 10/25/2022
Master Subcontract Agreement Contract for all projects for which Contractor engages Subcontractor. 10/25/2022
Master Trucking Agreement Contract for all projects for which Contractor engages Trucker. 11/02/2022

Frequently Asked Questions


Why should I choose Preston Companies to serve my project needs?

With over 50 foremen and crews, Preston Companies is one of the largest underground utility and dirt management contractors in California. Our large, expertly trained team gives us the flexibility to serve our clients quickly and efficiently.


What are Preston Companies’ design-build capabilities?

Preston Companies takes a collaborative approach to design-build. We partner directly with leading engineering firms to deliver design-build projects to our clients.


I need help with budgets for my upcoming project. Can Preston Companies help?

Yes, Preston Companies has extensive estimating resources across all of our disciplines, and can help you define a project scope and related budget.


My company does mostly interior improvements, but we are being asked to include site electrical scope in an upcoming bid package. How can Preston Companies help me win this job?

We understand that some Electrical companies are not equipped to self-perform excavation work, or other scopes that require the use of heavy equipment. We can help you complete your bid package, and leverage our extensive fleet of equipment to execute trenching, backfilling, compaction, hoisting and setting of special equipment.


Is Preston Electric signatory to the IBEW?

Yes, Preston Electric is a union electrical contractor, capable of handling all C-10 licensed work.


We are beginning the soils analytics portion of our project. What can Preston Companies do to help this process?

You can leverage a variety of services provided by Dirt Market, a Preston Company. Our drilling machines are equipped with Shelby Tube technology to provide comprehensive dirt sampling that identifies your site’s unique soil characteristics. Samples are then taken to a lab for analysis, reviewed by our expert team, and matched up with a proper and legal disposal site.


When should we engage Dirt Market for these services?

The sooner the better. Often, customers wait until the construction phase of work to get soil analysis done. This can adversely affect the overall site schedule and logistics, as stockpiles continue to grow while sampling and analysis are being done. Executing soil sampling and analysis in the preconstruction phase allows you to move dirt as soon as construction begins.

For more information please contact:

  • Noel DaSilva (Billings/Collections)
  • (510) 366-0234
  • Michelle Costanza (Bids and Pre-Qualifications)
  • (916) 919-1341
  • How We Help You

    We take the time to learn about your specific needs and pain points to develop solutions that will have the greatest impact. Select a role below and see how Preston can support your needs!

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