Company lists · Data refreshed November 2026

Top 11 Engineering services companies based in Durham, United States

Name: Engineering services companies based in Durham, United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Nov 6, 2026 26 companies tracked

RevenueBase identified 26 company matches for engineering services companies associated with Durham, United States as of November 2026 and tracks 960 professional contacts across them, including 567 with verified work emails. Across the United States, Houston is the largest hub for this category (666 companies); Durham has 26.

This list covers company matches for engineering services companies associated with Durham, United States, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed November 6, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list RevenueBase SmartSearch · Exact Recorded Nov 6, 2026 How this list was built

26Companies

960Contacts tracked

567Verified emails

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The 11 largest engineering services companies based in Durham, United States

Ranked by team size

Top 11 of 26 company matches for engineering services companies based in Durham, United States, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Nov 6, 2026. The RevenueBase SmartSearch column shows Exact match membership in this saved search. Click a contact count to view that company's people. Totals use company locations recorded by RevenueBase; the displayed preview is a smaller selection.
#	Company	RevenueBase SmartSearch	Headquarters	Employees	Contacts
1	Three Oaks Engineering	Exact match	Durham, NC, United StatesHQ recorded Nov 6, 2026	51-200	59 contacts →
	Exact match “Three Oaks Engineering is a woman-owned business enterprise (WBE) focused on helping our clients successfully accomplish infrastructure projects with careful consideration of…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
2	Mhaworks	Exact match	Durham, NC, United StatesHQ recorded Nov 6, 2026	11-50	45 contacts →
	Exact match “Founded in 1988 as a solo practice, MHAworks has become a successful design firm that provides architecture and interior design services through our regional offices in Asheville…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
3	EPS Technology	Exact match	Durham, CT, United StatesHQ recorded Nov 6, 2026	51-200	41 contacts →
	Exact match “EPST is a NETA Certified, Independent Electrical Testing & Engineering Organization.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
4	Civil Consultants, INC	Exact match	Durham, NC, United StatesHQ recorded Nov 6, 2026	1-10	16 contacts →
	Exact match Recorded description not available. Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
5	Riverside Resources LLC	Exact match	Durham, United StatesHQ recorded Nov 6, 2026	11-50	14 contacts →
	Exact match “Riverside Resources LLC's primary mission is to provide specialized staffing options to increase your flexibility and effectiveness in capital project execution and program…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
6	RND Architects, PA	Exact match	Durham, NC, United StatesHQ recorded Nov 6, 2026	11-50	12 contacts →
	Exact match “Since 1987, RND Architects, PA has been providing enduring architectural design solutions for our clients throughout North Carolina.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
7	Spring Stoops Mccullen Engineering, PA	Exact match	Durham, NC, United StatesHQ recorded Nov 6, 2026	11-50	10 contacts →
	Exact match “Mechanical & Electrical Engineering design firm specializing in HVAC, Plumbing, Fire Protection, and Electrical design for institutional and commercial facilities.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
8	Collins Structural Consulting, Pllc	Exact match	Durham, NC, United StatesHQ recorded Nov 6, 2026	1-10	7 contacts →
	Exact match “Collins Structural Consulting, PLLC is a structural engineering firm providing services for a variety of commercial structures with specialties in pharmaceutical projects…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
9	Ellen Cassilly Architects	Exact match	Durham, NC, United StatesHQ recorded Nov 6, 2026	1-10	5 contacts →
	Exact match “Ellen Cassilly Architects is an architecture and planning firm based in Durham, North Carolina.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
10	Applied Research Transformation, Pllc	Exact match	Durham, NC, United StatesHQ recorded Nov 6, 2026	1-10	2 contacts →
	Exact match “Applied Research transformation (ARtx) delivers innovative technology for construction, inspection, monitoring, and sustainment of heavy civil infrastructure.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
11	DTW Architects And Planners	Exact match	Durham, NC, United StatesHQ recorded Nov 6, 2026	1-10	1 contacts →
	Exact match Recorded description not available. Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase

RevenueBase SmartSearch

Describe a niche business in your own words. RevenueBase SmartSearch compares the meaning of your description with company business descriptions compiled in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit.

This list uses Exact for “engineering services companies”. Each Exact match badge shows membership in that saved search; it is not an individual similarity score or a service-quality rating. Recorded descriptions are shown where available.

Showing 11 of 26 engineering services companies based in Durham, United States

See the full list, filter by size, metro and specialty, and access 567 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Engineering services companies based in Durham, United States at a glance

As of Nov 6, 2026

59.1%Verified-email coverage

36.9Average contacts per company

11-50Median size (employees)

Nov 6, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

Email recency for this list is measured across the whole United States list rather than for Durham, so it is reported there. Company counts and contact totals on this page are exact for Durham, over 26 companies.

How this list was built

The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase SmartSearch, the natural-language company search available to every RevenueBase user.
What qualifies: Company records associated with Durham, United States whose business descriptions match “engineering services companies” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
RevenueBase SmartSearch: Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
Public preview: The public preview omits records without a verified work email. Where headquarters information is recorded, preview rows are also filtered to this page’s location. Dataset totals and geographic summaries describe the full matched records before these preview filters.
Match quality: RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
Ranking: Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
Verification: Every displayed company carries at least one verified work email. RevenueBase tracks 567 professional contacts with verified work emails across the full matched dataset. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh: This page's figures were pulled from the company graph on November 6, 2026. Lists refresh periodically as the graph is re-checked.
Record context: Company records and descriptions can change. Check the company's website for its current services and locations.

Engineering services companies by metro in the United States

Frequently asked

What is RevenueBase SmartSearch?

RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “engineering services companies”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many engineering services companies are there based in Durham, United States?

RevenueBase identified 26 company matches for engineering services companies associated with Durham, United States as of November 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.

What is the largest company on this list?

Three Oaks Engineering tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which city in the United States has the most engineering services companies?

Houston leads the United States with 666 company records, followed by New York (559) and Chicago (257). Durham has 26.

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work limited free results with 500 credits to start. Upgrading provides access to the 567 professional contacts with verified work emails tracked across these 26 companies; direct dials are available where recorded.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on November 6, 2026.

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About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase SmartSearch, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.