ONeil Engineering Services
1480 Oakbridge Ct, Powhatan, VA 23139 (804) 921-3589 Visit Website
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ONeil Engineering Services is a VOSB engineering firm based in Virginia with engineers licensed in VA, NC, MD, DE, NY, CO, TX, and DC. We offer HVAC, plumbing, gas piping, and electrical engineering design and consulting services. Our principal engineers have over 60 years of industry experience ranging from large mission-critical data center environments to medical offices, restaurants, and retail spaces. Contact us to learn more about our federal contracting capabilities. 

Core Competencies

Mechanical and Plumbing

  • Building HVAC Systems
  • Computer Room AC Systems
  • Plumbing Systems
  • Natural Gas and Propane Design
  • Failure Analysis and Equipment Studies
  • 3D Coordination Drawings for BIMSystem Design


  • Emergency Power Supply Systems
  • Power Monitoring & Control Systems
  • Power System Studies and Analysis
  • Energy Code/COMCheck
  • Fire Alarm and Detection Systems
  • Structured Cabling Systems

Our engineers are licensed in Virginia, North Carolina, Maryland, Delaware, New York, Colorado and the District of Columbia. Our principal engineers have over 20 years of average experience in design for construction. Additionally, our staff holds LEED AP credentials


  • American Society of Heating, Refrigerating and Air Conditioning Engineers, Inc. (ASHRAE)
  • American Society of Plumbing Engineers (ASPE)
  • 7x24 Exchange International
  • Nation Fire Protection Association (NFPA)
  • US Green Building Council (USGBC)