Business Details
34 Years
experience
Emergency
services
Your Trusted Partner for Construction Solutions in Woodland, CA
Founded in 1992 by Spencer Defty, Diamond D General Engineering has established itself as a leader in heavy civil construction through consistent growth and financial success. Our team combines over 60 years of collective industry experience with a commitment to safety, evidenced by our numerous safety awards and 79% average workers' compensation modification rate. We maintain a late-model equipment fleet and perform 90% of all projects in-house, ensuring quality control and reliability. Our focus on environmentally friendly practices, including leak-free operations and sustainable methods, positions us as a forward-thinking contractor.With a Class A General Engineering License (#654051) and DBE certification (#33164), we serve both large-scale and small commercial clients across California. Our affiliations with organizations like Patriots for Veterans and Farm Bureau demonstrate our community engagement. The company's bonding capacity of $3 million and proven track record in complex projects like flood control structures and ecological restoration set us apart as a trusted industry partner.
Services
Earthwork
Excavation
Underground
Ecological Restoration
Structures
Paving
Demolition
Grinding
Details
- Year established: 1992
Highlights and features
- We maintain a 79% average workers' compensation modification rate demonstrating safety excellence
- Our team self-performs 90% of all projects ensuring quality control
- We operate a modern equipment fleet with comprehensive maintenance programs
- We hold a Class A General Engineering License (#654051) in California
- Our 30+ years of experience includes completing complex emergency infrastructure projects
Associations and certifications
- DBE Certified
Services
Earthwork
Our earthwork services include precision grading, site preparation, and terrain modification using modern equipment. We handle large-scale commercial projects and emergency infrastructure needs with experienced operators. Our environmentally conscious approach ensures minimal ecological impact while meeting strict project specifications.
Ecological Restoration
We specialize in restoring natural ecosystems through bank stabilization, wetland rehabilitation, and wildlife habitat improvements. Our work on projects like the Secret Ravine Emergency Sewer Main Replacement demonstrates our technical expertise. We combine construction excellence with environmental stewardship to meet regulatory requirements and community needs.
Emergency Repairs
Our emergency response team handles urgent infrastructure failures including levee breaches, flood control issues, and utility disruptions. With rapid mobilization capabilities and specialized equipment, we've completed critical projects like the Pleasant Grove Wastewater Treatment Plant Outfall. Our 24/7 readiness ensures immediate action during emergencies.
Paving
We provide durable paving solutions for roads, parking lots, and industrial sites using advanced techniques and quality materials. Our paving division handles both new construction and rehabilitation projects. The team's expertise extends to specialized applications like ADA-compliant surfaces and heavy-use commercial areas.
Demolition
Our demolition services combine safety protocols with efficient techniques for building and infrastructure removal. We handle projects ranging from small commercial structures to large-scale military housing demolition. Our comprehensive approach includes debris management and site preparation for redevelopment.
People
Spencer Defty
President
Founder Spencer Defty established Diamond D in 1992 with a vision for quality construction. His leadership emphasizes teamwork, innovation, and integrity. With decades of industry experience, he maintains active involvement in project oversight and company direction.
Questions
What construction services do you specialize in?
We specialize in earthwork, excavation, ecological restoration, paving, demolition, and emergency infrastructure repairs across California.
Are you equipped for emergency projects?
Yes, we maintain rapid response capabilities for emergency repairs including flood control, levee breaches, and utility failures.
What safety certifications do you hold?
We maintain a 79% workers' compensation modification rate and have received multiple safety awards for our construction practices.
Do you handle both public and private projects?
Yes, we work with government agencies, municipalities, and private clients on a wide range of construction needs.
What geographic areas do you serve?
We primarily serve Northern California including Sacramento, Yolo, Colusa, Napa, and Solano counties.
Can you handle large-scale infrastructure projects?
Yes, with $3 million bonding capacity and experienced teams, we successfully complete complex multi-million dollar projects annually.
