• Photo of Bartram's Mile

    Environmental Services

    Bartram’s Mile

  • Photo of New Castle Dock

    Marine Services

    New Castle Dock

  • Photo of the Incyte Building

    Multi-Disciplined Services


  • Photo of Museum of the American Revolution

    Construction Phase Services

    Museum of the American Revolution

  • Photo of Millsboro Tank Raising

    Water/Wastewater Engineering

    Millsboro Tank Raising

  • Photo of Rock and Foundation of Incyte Build

    Geotechnical Engineering


  • Civil Engineering



Welcome to Duffield Civil Engineering: We are specialists in civil and environmental engineering projects

Today’s landscape and structural engineering projects are complex and, in addition to civil and environmental engineering, our services include architecture engineering, geotechnical engineering, wastewater engineering, and materials testing. We are past the days where one person can do it all. Various specialties need to be utilized in order to get you across the finish line. Duffield is a civil engineering company serving PA, MD, NJ, & DE. We are large enough to provide all of these diverse services, yet small enough to know each other personally which helps us to easily and routinely collaborate across our disciplines to resolve your project’s civil engineering, environmental, and science needs.


904, 2021

Andra J. Kidd Named COO of National-Reaching Environmental, Energy, Water and Civil Infrastructure Platform

April 9th, 2021|

Andra J. Kidd (Ms. Kidd) has joined the national-reaching environmental, energy, water and civil infrastructure platform Round Table Capital (RTC) Partners launched in July of 2020. Ms. Kidd will serve as the company’s Chief Operating Officer (COO). The platform currently includes Ohio-based Hull & Associates, LLC, Delaware-based Duffield Associates, LLC [...]

Enhancing our community one project at a time. Small enough to collaborate. Large enough to be technically diverse. Diverse thinking and collaboration leverage value.
Go to Top