Proudly Serving out of Sebastopol, CA and into Sonoma County, Napa County, Marin County & Surrounding Areas
Excavation, Underground Utilities, Site Development, Concrete, Paving, and More
Santiago General Engineering delivers top-notch results with care, safety, and skill. With over 15 years in the field, our team skillfully undertakes excavation, utilities, and site development. Expect clear communication, expert advice, and work done right, on schedule, with no shortcuts.
Heavy Civil Contractor Sonoma County
Proudly serving Sonoma, Napa, Lake, and Marin County and beyond with dependable excavation and site development services for residential, commercial, and public projects.
What Makes Us Different
Every project is completed to the highest standards with careful attention to long-term performance.
Clients stay informed throughout the process with consistent updates and honest recommendations.
Led by a former union foreman with 15+ years of experience managing large-scale civil projects.
Rooted in Sonoma County, the company values relationships and reputation in the communities it serves.
Our Quoting Process
Schedule Visit
Book a time for a no-obligation site walk.
Meet Onsite
Discuss goals, budget, and available options directly on your property.
Review Options
Receive a breakdown of choices tailored to the project’s size and scope.
Estimate Provided
Get a clear, written estimate with no hidden fees.
Approve & Start
Move forward with confidence once the estimate is approved.
Our Service Areas
Proudly serving Northern California with dependable heavy civil contracting and engineering services for homes, businesses, and public projects.
- Santa Rosa
- Sebastopol
- Petaluma
- Windsor
- Healdsburg
- Sonoma County
- Napa County
- Marin County
Trusted Engineering in Sonoma County
Contact Santiago General Engineering
Get in touch today to request your free estimate or learn more about our heavy civil contractors and site development services. A local expert will respond quickly.