Insights

Diversified Service Portfolio Duffield Associates offers a comprehensive range of engineering disciplines including civil, geotechnical, environmental, water and wastewater, and structural engineering, positioning them as a one-stop solution for integrated infrastructure projects which can be appealing to clients seeking turnkey services.

Strong Regional Presence With regional offices in Delaware, Pennsylvania, New Jersey, and Maryland, Duffield has a strategic geographic footprint in the Mid-Atlantic area, enabling targeted outreach for local government agencies, developers, and private clients in these growth markets.

Reputable Employer Recognized as a Top Work Place in Delaware in 2018, Duffield's positive company culture and emphasis on community engagement suggest a stable organization that values employee collaboration, which can be leveraged to position them as a trusted long-term partner.

Growth and Leadership Recent hires like senior consultant David Small, combined with consistent growth in revenue between 10 and 25 million dollars, indicates an expanding firm open to strategic collaborations and consulting opportunities that align with their growth trajectory.

Technology Stack & Digital Reach Utilizing a diverse array of digital tools such as Google Analytics, SEO, and social media integrations, Duffield is actively enhancing its online presence, presenting opportunities for digital marketing collaborations and online engagement campaigns to strengthen their market outreach.

Duffield Associates Tech Stack

Duffield Associates uses 8 technology products and services including Twemoji, Font Awesome, MooTools, and more. Explore Duffield Associates's tech stack below.

  • Twemoji
    Font Scripts
  • Font Awesome
    Font Scripts
  • MooTools
    Javascript Frameworks
  • jQuery
    Javascript Libraries
  • Microsoft Office
    Office Suites
  • Yoast SEO
    Search Engines
  • VMware
    Virtualisation Software
  • Google Analytics
    Web Analytics

Duffield Associates's Email Address Formats

Duffield Associates uses at least 1 format(s):
Duffield Associates Email FormatsExamplePercentage
FLast@duffnet.comJDoe@duffnet.com
96%
First@duffnet.comJohn@duffnet.com
2%
Last@duffnet.comDoe@duffnet.com
1%
First.Last@duffnet.comJohn.Doe@duffnet.com
1%

Frequently Asked Questions

Where is Duffield Associates's headquarters located?

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Duffield Associates's main headquarters is located at 5400 Limestone Road Wilmington, Delaware 19808 United States. The company has employees across 1 continents, including North America.

What is Duffield Associates's phone number?

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You can contact Duffield Associates's main corporate office by phone at . For more prospecting data, LeadIQ has access to up-to-date and accurate contact information within our platform. Find, capture, and sync contact data to your CRM and sales tools in one click.

What is Duffield Associates's official website and social media links?

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Duffield Associates's official website is duffnet.com and has social profiles on LinkedIn.

What is Duffield Associates's NAICS code?

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Duffield Associates's NAICS code is 237 - Heavy and Civil Engineering Construction.

How many employees does Duffield Associates have currently?

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As of December 2025, Duffield Associates has approximately 57 employees across 1 continents, including North America. Key team members include President: V. B.Environmental Services Director: D. S.Geotechnical/Field Services Division Director: H. S.. Explore Duffield Associates's employee directory with LeadIQ.

What industry does Duffield Associates belong to?

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Duffield Associates operates in the Civil Engineering industry.

What technology does Duffield Associates use?

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Duffield Associates's tech stack includes TwemojiFont AwesomeMooToolsjQueryMicrosoft OfficeYoast SEOVMwareGoogle Analytics.

What is Duffield Associates's email format?

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Duffield Associates's email format typically follows the pattern of FLast@duffnet.com. Find more Duffield Associates email formats with LeadIQ.

When was Duffield Associates founded?

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Duffield Associates was founded in 1976.

Duffield Associates

Civil EngineeringDelaware, United States51-200 Employees

Duffield Associates, established in 1976, is a civil engineering firm headquartered in a historic barn and farmhouse in Pike Creek Valley near Wilmington, Delaware. It maintains regional offices in Dover, DE; Philadelphia and Carlisle, PA; Thorofare, NJ; and Bel Air, MD to serve clients across the mid-Atlantic, offering a broad suite of services across civil, environmental, water and wastewater, and related disciplines. The firm serves both public and private sector clients, addressing infrastructure development, environmental stewardship, and community-scale improvements through integrated multidisciplinary approaches. Its culture emphasizes cross-disciplinary collaboration and community engagement, with a 2018 Top Workplace recognition in Delaware and growth-oriented hiring, such as the 2017 appointment of a senior consultant.

Section iconCompany Overview

Headquarters
5400 Limestone Road Wilmington, Delaware 19808 United States
Phone number
NAICS Code
237 - Heavy and Civil Engineering Construction
Founded
1976
Employees
51-200

Section iconFunding & Financials

  • $10M$25M

    Duffield Associates's revenue is estimated to be in the range of $10M$25M

Section iconFunding & Financials

  • $10M$25M

    Duffield Associates's revenue is estimated to be in the range of $10M$25M

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