ABOUT US
Quality construction starts with experience, precision, and pride in our work. From site preparation to final grading, we approach every project with the same commitment to excellence that has defined Diamond D for over 30 years.
Quaility
Construction
30+ Years of Proven Performance
delivering quality work, dependable service, and results that stand the test of time.
We are dedicated to
Our Story
Diamond D General Engineering was founded in 1994 by Spencer Defty with a single dozer, a strong work ethic, and a commitment to delivering quality results. What began as a one-man operation has grown into a trusted company serving agricultural and commercial clients throughout California.
Through decades of hard work, dedication, and a reputation for reliable service, Spencer built Diamond D on the values of integrity, craftsmanship, and treating every project as if it were his own. Today, those same principles continue to guide the company, backed by more than 30 years of industry experience and a passion for helping clients bring their projects to life.
Spencer Defty is the founder of Diamond D General Engineering and the driving force behind the company's reputation for quality, reliability, and hard work. With more than 30 years of experience in the industry, Spencer has built a deep understanding of earthwork, excavation, agricultural development, and site preparation, allowing him to provide practical solutions and exceptional results for his clients. As a husband, father, and grandfather, he is deeply rooted in Northern California and takes pride in serving the community that has supported Diamond D throughout the years. His hands-on leadership, industry expertise, and commitment to doing things right continue to shape the company's values and success today.
Spencer defty
Our Founder
