About Us

Spencer Defty: President
President: Spencer Defty

Diamond D, located in Woodland, CA, has maintained consistent growth and financial success from the time Spencer Defty founded the company in 1992. Throughout his experience in the construction industry, Mr. Defty has built a reputation for his positive attitude, responsiveness, problem-solving innovation, and integrity.

Mr. Defty's leadership approach rewards teamwork, initiative, and accomplishment, creating a positive work environment that challenges our staff and provides opportunities for advancement while fostering the excellent performance that our clients expect.

Additional Company Information

  • Class A General Engineering License # 654051
  • Self – Perform 90% of All Projects
  • Bonding Capacity- $3 Million
  • Average Workmen's Compensation Modification Rate – 79%
  • Underutilized Disadvantaged Business Enterprise (DBE) Certified No. 33164
  • California Small Business Supplier #34135


  • Patriots for Veterans
  • Farm Bureau