Company lists · Data refreshed September 2026

Top 25 Engineering consultancies based in St. Louis, United States

Name: Engineering consultancies based in St. Louis, United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 24, 2026 34 companies tracked

RevenueBase identified 34 company matches for engineering consultancies associated with St. Louis, United States as of September 2026 and tracks 1,904 professional contacts across them, including 881 with verified work emails. Across the United States, Houston is the largest hub for this category (622 companies); St. Louis has 74.

This list covers company matches for engineering consultancies associated with St. Louis, 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 September 24, 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 Sep 24, 2026 How this list was built

34Companies

1,904Contacts tracked

881Verified emails

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The 25 largest engineering consultancies based in St. Louis, United States

Ranked by team size

Top 25 of 34 company matches for engineering consultancies based in St. Louis, United States, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 24, 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	International Design Services, INC	Exact match	St. Louis, MO, United StatesHQ recorded Sep 24, 2026	501-1,000	293 contacts →
	Exact match “International Design Services, Inc.(IDS) strives to be a leader in detailing and connection design by providing the highest quality of details quickly and efficiently.” Recorded in the RevenueBase company graph · Sep 24, 2026 · View company records in RevenueBase
2	Inactive Barry-Wehmiller International B-Wi	Exact match	St. Louis, MO, United StatesHQ recorded Sep 24, 2026	n/a	262 contacts →
	Exact match Recorded description not available. Recorded in the RevenueBase company graph · Sep 24, 2026 · View company records in RevenueBase
3	David Mason Associates DMA	Exact match	St. Louis, MO, United StatesHQ recorded Sep 24, 2026	51-200	144 contacts →
	Exact match “David Mason + Associates (DMA) is a professional engineering company, incorporated in 1989.” Recorded in the RevenueBase company graph · Sep 24, 2026 · View company records in RevenueBase
4	Gonzalez Companies, LLC	Exact match	St. Louis, MO, United StatesHQ recorded Sep 24, 2026	51-200	131 contacts →
	Exact match “Gonzalez is a full-service civil engineering and construction management firm with offices in St.” Recorded in the RevenueBase company graph · Sep 24, 2026 · View company records in RevenueBase
5	Mcclure Engineering-St. Louis MEP	Exact match	St. Louis, MO, United StatesHQ recorded Sep 24, 2026	51-200	129 contacts →
	Exact match “McClure Engineering is a Mechanical and Electrical Consulting Engineering firm dedicated to the development of innovative solutions for the unique engineering needs of our clients.” Recorded in the RevenueBase company graph · Sep 24, 2026 · View company records in RevenueBase
6	Luzco Technologies LLC	Exact match	St. Louis, MO, United StatesHQ recorded Sep 24, 2026	51-200	126 contacts →
	Exact match “LUZCO’s team of knowledgeable experts will strategically guide your team through each step of the process and help you develop innovative strategies, improve efficiency, enhance…” Recorded in the RevenueBase company graph · Sep 24, 2026 · View company records in RevenueBase
7	Penta Engineering Corporation	Exact match	St. Louis, MO, United StatesHQ recorded Sep 24, 2026	51-200	118 contacts →
	Exact match “PENTA Engineering Corporation is an international, multidisciplinary firm providing comprehensive consulting and design/build solutions to the cement, lime, industrial minerals…” Recorded in the RevenueBase company graph · Sep 24, 2026 · View company records in RevenueBase
8	CDG Engineers, INC	Exact match	St. Louis, MO, United StatesHQ recorded Sep 24, 2026	51-200	113 contacts →
	Exact match “CDG Engineers is a full service, multi-discipline professional services organization with capabilities in civil, structural, electrical and mechanical engineering, as well as…” Recorded in the RevenueBase company graph · Sep 24, 2026 · View company records in RevenueBase
9	CCI	Exact match	St. Louis, MO, United StatesHQ recorded Sep 24, 2026	51-200	107 contacts →
	Exact match “Code Consultants, Inc.(CCI) is an engineering and consulting firm providing a diverse range of design and consultation services since 1973: Fire protection & life safety code…” Recorded in the RevenueBase company graph · Sep 24, 2026 · View company records in RevenueBase
10	Cole & Associates	Exact match	St. Louis, MO, United StatesHQ recorded Sep 24, 2026	51-200	97 contacts →
	Exact match “Cole focuses on providing civil engineering, surveying, planning, landscape architecture, GIS, and ADA transition planning services of the highest professional caliber to…” Recorded in the RevenueBase company graph · Sep 24, 2026 · View company records in RevenueBase
11	Bhmg Engineers, INC	Exact match	St. Louis, MO, United StatesHQ recorded Sep 24, 2026	51-200	87 contacts →
	Exact match “BHMG is a leading provider of utility-focused engineering and consulting services headquartered in St.” Recorded in the RevenueBase company graph · Sep 24, 2026 · View company records in RevenueBase
12	Case Engineering, INC	Exact match	St. Louis, MO, United StatesHQ recorded Sep 24, 2026	51-200	75 contacts →
	Exact match “The principals at Case Engineering, Inc.” Recorded in the RevenueBase company graph · Sep 24, 2026 · View company records in RevenueBase
13	Stock & Associates Consulting Engineers, INC	Exact match	St. Louis, MO, United StatesHQ recorded Sep 24, 2026	11-50	36 contacts →
	Exact match Recorded description not available. Recorded in the RevenueBase company graph · Sep 24, 2026 · View company records in RevenueBase
14	M3 Engineering Group	Exact match	St. Louis, MO, United StatesHQ recorded Sep 24, 2026	11-50	26 contacts →
	Exact match “M3 Engineering Group is a MWBE consulting firm with offices in St.” Recorded in the RevenueBase company graph · Sep 24, 2026 · View company records in RevenueBase
15	Architectural Design Guild	Exact match	St. Louis, MO, United StatesHQ recorded Sep 24, 2026	11-50	26 contacts →
	Exact match “Architectural Design Guild was founded in 1981 as a multi-disciplinary firm providing architecture, engineering (mechanical, electrical, plumbing), and interior design.” Recorded in the RevenueBase company graph · Sep 24, 2026 · View company records in RevenueBase
16	The Clayton Engineering Company	Exact match	St. Louis, MO, United StatesHQ recorded Sep 24, 2026	11-50	20 contacts →
	Exact match “Clayton Engineering was established in 1926 as a surveying company.” Recorded in the RevenueBase company graph · Sep 24, 2026 · View company records in RevenueBase
17	Rooftech Consulting, INC	Exact match	St. Louis, MO, United StatesHQ recorded Sep 24, 2026	11-50	14 contacts →
	Exact match “RoofTech Consulting Inc.” Recorded in the RevenueBase company graph · Sep 24, 2026 · View company records in RevenueBase
18	Anvil Engineering	Exact match	St. Louis, MO, United StatesHQ recorded Sep 24, 2026	1-10	13 contacts →
	Exact match “Anvil was formally established by ACME Constructors in 2015 following the success of over 10 years of completing design–build projects.” Recorded in the RevenueBase company graph · Sep 24, 2026 · View company records in RevenueBase
19	Volz Incorporated	Exact match	St. Louis, MO, United StatesHQ recorded Sep 24, 2026	11-50	11 contacts →
	Exact match “Since our formation in 1969, Volz Incorporated, a professional services company, has been providing Professional Engineering, Land Planning, and Land Surveying services.” Recorded in the RevenueBase company graph · Sep 24, 2026 · View company records in RevenueBase
20	Altamira LLC	Exact match	St. Louis, MO, United StatesHQ recorded Sep 24, 2026	11-50	11 contacts →
	Exact match “Altamira provides a range of services for the beverage industry.” Recorded in the RevenueBase company graph · Sep 24, 2026 · View company records in RevenueBase
21	CCS Group, INC	Exact match	St. Louis, MO, United StatesHQ recorded Sep 24, 2026	1-10	9 contacts →
	Exact match “CCS Group is a full service construction consulting firm serving owners, design professionals, contractors and subcontractors.” Recorded in the RevenueBase company graph · Sep 24, 2026 · View company records in RevenueBase
22	Grayco Consulting	Exact match	St. Louis, MO, United StatesHQ recorded Sep 24, 2026	1-10	8 contacts →
	Exact match “Grayco Consulting offers advanced expertise for new or existing industrial, commercial and institutional projects.” Recorded in the RevenueBase company graph · Sep 24, 2026 · View company records in RevenueBase
23	Pavetech Consulting, INC	Exact match	St. Louis, MO, United StatesHQ recorded Sep 24, 2026	1-10	8 contacts →
	Exact match “PaveTech specializes in the proper repair, maintenance, and design of new and existing roadways, parking lots, and parking structures.” Recorded in the RevenueBase company graph · Sep 24, 2026 · View company records in RevenueBase
24	Design Nine, INC	Exact match	St. Louis, MO, United StatesHQ recorded Sep 24, 2026	11-50	7 contacts →
	Exact match “Engineering Services For Railroads And Industries” Recorded in the RevenueBase company graph · Sep 24, 2026 · View company records in RevenueBase
25	Civil Engineering Design Consultants, INC	Exact match	St. Louis, MO, United StatesHQ recorded Sep 24, 2026	1-10	3 contacts →
	Exact match “CEDC is a St.” Recorded in the RevenueBase company graph · Sep 24, 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 consultancies”. 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 25 of 34 engineering consultancies based in St. Louis, United States

See the full list, filter by size, metro and specialty, and access 881 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Engineering consultancies based in St. Louis, United States at a glance

As of Sep 24, 2026

46.3%Verified-email coverage

56.0Average contacts per company

11-50Median size (employees)

Sep 24, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

501-1,000

Email recency for this list is measured across the whole United States list rather than for St. Louis, so it is reported there. Company counts and contact totals on this page are exact for St. Louis, over 34 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 St. Louis, United States whose business descriptions match “engineering consultancies” 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 881 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 September 24, 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 consultancies 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 consultancies”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many engineering consultancies are there based in St. Louis, United States?

RevenueBase identified 34 company matches for engineering consultancies associated with St. Louis, United States as of September 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?

International Design Services, INC 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 consultancies?

Houston leads the United States with 622 company records, followed by New York (449) and Austin (208). St. Louis has 74.

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 881 professional contacts with verified work emails tracked across these 34 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 September 24, 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.