Designing Solutions. Engineering Results.

Our team


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

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We value our client relationships and look forward to serving your individual needs. 



ONeil Engineering Services specializes in HVAC, Plumbing, Gas Piping, and Electrical engineering design.