About Us

One of the most important aspects in any relationship is trust, and, as a family-owned business operating in the Triangle for over 20 years, you can trust that the management at Cornerstone Construction will take special care to create long-term, healthy relationships with our clients. We have a vested interest in our community and have always operated with our 3 tenets in mind:

  1. Quality
  2. Honesty
  3. Integrity

To put it simply, We Care.

Meet The Cornerstone Family

John Enggas, Owner and President

  • Graduate of Cabrillo College, Santa Cruz, CA, with a degree in Construction Management and Technology.
  • Over 30 years in the construction field, serving as carpenter, superintendent, and project manager before establishing Cornerstone Construction in 1992.
  • Attained two General Contractor Licenses and specializes in all phases of commercial/multi-family construction, including interior/exterior renovations, ADA modifications, ground up construction, commercial fit-ups, estimating and customer relations.


Patti Enggas, Owner

  • Accumulated over 25 years of experience in the financial industry.
  • Qualified in all aspects of business accounting, with past experience in the hospitality market and vehicle financing.
  • Achieved top level management positions through excellent customer service and attention to detail.


Ryan Enggas, Vice President

  • Received a diploma from NC State in Construction Project Management and holds Certification in Mold Abatement, Asbestos Removal, Blueprint Reading and an OSHA 10 card.
  • Focused on cultivating long-term client relationships through exceptional service in project estimation and management.
  • Skilled in managing projects that involve extensive remodeling or renovation, particularly in the commercial and multi-family market and has over 15 years of experience in the commercial and multi-family construction fields.