Founded by Sean Duffy and Erik Harley in 2009, H&D Mechanical is a mid-size mechanical contractor based in Upper Marlboro, Maryland. H&D has an established record of superior work in a variety of settings, including medical, scientific and commercial projects.
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H&D Mechanical Questions
The H&D Mechanical annual revenue was $1 million in 2026.
10 people are employed at H&D Mechanical.
H&D Mechanical is based in Upper Marlboro, Maryland.
The NAICS codes for H&D Mechanical are [23822, 2382, 238, 23, 238220].
The SIC codes for H&D Mechanical are [17, 171].
Top H&D Mechanical Employees
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Sean Duffy
Principal at H&D Mechanical
Upper Marlboro, MD, US14 -
Erik Harley
Principal at H&D Mechanical
Port Tobacco, MD, US54 -
Jamaal Carrington
Steamfitter at H&D Mechanical
Greenbelt, MD, US1 -
Brandon Hayden
Estimator at H&D Mechanical
Upper Marlboro, MD, US22 -
Megan Duffy
Project Manager at H&D Mechanical
Washington, DC, US12 -
Alexander Harley
Project Manager at H&D Mechanical
Owings, MD, US1 -
Tracy Derossett
Mechanic at H&D Mechanical
Jonesboro, IL, US11
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