Company lists · Data refreshed September 2026

Top 25 Engineering consulting firms based in Houston, United States

Name: Engineering consulting firms based in Houston, United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 12, 2026 528 companies tracked

RevenueBase identified 528 engineering consulting firms headquartered in Houston, United States as of September 2026 and tracks 24,738 professional contacts across them, including 10,006 with verified work emails and 9,886 with mobile numbers. Houston is the largest hub.

This list covers engineering consulting firms headquartered in Houston, United States, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 12, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, 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 HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 12, 2026 86% judged on-target in blind review

528Companies

24,738Contacts tracked

10,006Verified emails

9,886Mobile numbers

Explore this list → Free signup · no credit card · 500 free credits

The 25 largest engineering consulting firms based in Houston, United States

Ranked by team size

Top 25 of 528 engineering consulting firms based in Houston, United States, ranked by team size, largest first. Data refreshed Sep 12, 2026. RevenueBase Smart Search rates how each company's information relates to engineering consulting firms: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	LJA	Indirect evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	1,001-5,000	1,932 contacts →
	Indirect evidence “Employee-Owned.” Source: RevenueBase Database · checked Sep 12, 2026
2	Audubon Companies	Partial evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	1,001-5,000	1,488 contacts →
	Partial evidence “Founded in 1997, Audubon Companies LLC provides EPC, consulting, fabrication, and field services to energy and industrial operators across the globe.” Source: RevenueBase Database · checked Sep 12, 2026
3	Walter P Moore	Indirect evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	1,001-5,000	1,298 contacts →
	Indirect evidence “Welcome to Walter P Moore!” Source: RevenueBase Database · checked Sep 12, 2026
4	Rimkus	Indirect evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	1,001-5,000	1,184 contacts →
	Indirect evidence “Consultants.” Source: RevenueBase Database · checked Sep 12, 2026
5	Bge, INC	Indirect evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	1,001-5,000	1,112 contacts →
	Indirect evidence “Ranked No.” Source: RevenueBase Database · checked Sep 12, 2026
6	Gulf Companies	Indirect evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	1,001-5,000	1,046 contacts →
	Indirect evidence “At Gulf Companies, we are driven by our mission to serve a vital role in the global energy industry.” Source: RevenueBase Database · checked Sep 12, 2026
7	KBR Energo Engineering	Partial evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	n/a	789 contacts →
	Partial evidence “Energo Engineering is a KBR Company that provides the full package of structural integrity management (SIM) and advanced structural engineering services for offshore floating and…” Source: RevenueBase Database · checked Sep 12, 2026
8	Quiddity	Strong evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	501-1,000	683 contacts →
	Strong evidence “Quiddity is an award-winning, full-service civil engineering, planning, surveying, and consulting firm providing innovative solutions for public infrastructure and private…” Source: RevenueBase Database · checked Sep 12, 2026
9	Cobb, Fendley & Associates, INC	Indirect evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	501-1,000	524 contacts →
	Indirect evidence “Cobb, Fendley & Associates, Inc.(CobbFendley) is a nationally recognized infrastructure solutions firm with a regional focus and a commitment to excellence.” Source: RevenueBase Database · checked Sep 12, 2026
10	Lockwood, Andrews & Newnam, Inc. LAN	Strong evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	201-500	461 contacts →
	Strong evidence “Lockwood, Andrews & Newnam, Inc.(LAN) is a full-service consulting firm offering planning, engineering and program management services.” Source: RevenueBase Database · checked Sep 12, 2026
11	Stress Engineering Services, INC	Partial evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	201-500	345 contacts →
	Partial evidence “Stress Engineering Services: 50 years of turning critical uncertainty into engineering certainty.” Source: RevenueBase Database · checked Sep 12, 2026
12	PGAL	Partial evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	201-500	312 contacts →
	Partial evidence “Founded in 1946, PGAL is a design firm specializing in architecture, engineering, interiors, and planning for a diverse portfolio of public and private sector clients.” Source: RevenueBase Database · checked Sep 12, 2026
13	ARION	Indirect evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	201-500	310 contacts →
	Indirect evidence “We are A-Team of engineers specializing in the energy industry.” Source: RevenueBase Database · checked Sep 12, 2026
14	Tolunay-Wong Engineers, INC	Partial evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	201-500	260 contacts →
	Partial evidence “Founded in 1993, Tolunay-Wong Engineers, Inc.(TWE) is ranked as one of the Top 10 largest civil engineering firms in Houston.” Source: RevenueBase Database · checked Sep 12, 2026
15	GSI Environmental INC	Strong evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	201-500	259 contacts →
	Strong evidence “GSI Environmental, Inc.(GSI), is an environmental engineering and science consulting firm committed to measuring, analyzing, and solving complex environmental problems around the…” Source: RevenueBase Database · checked Sep 12, 2026
16	Office Of The County Engineer	Indirect evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	501-1,000	248 contacts →
	Indirect evidence “Office of the County Engineer is a regional leader in providing wholly integrated professional services to a broad range of clients.” Source: RevenueBase Database · checked Sep 12, 2026
17	Ehra Engineering	Partial evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	201-500	247 contacts →
	Partial evidence “EHRA Engineering is a civil engineering, surveying, low impact developing, land planning, construction phase services, traffic, emergency management and landscape architecture…” Source: RevenueBase Database · checked Sep 12, 2026
18	NEW Tech Global	Indirect evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	51-200	245 contacts →
	Indirect evidence “New Tech Global (NTG) is comprised of 5 different business units: New Tech Global Ventures: Upstream Oil & Gas consultancy services, and W-2 professional placement services for…” Source: RevenueBase Database · checked Sep 12, 2026
19	DBR	Partial evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	201-500	227 contacts →
	Partial evidence “Founded in 1972, DBR has evolved into the premier MEP engineering firm in Texas, providing mechanical, electrical, and plumbing engineering services, as well as building…” Source: RevenueBase Database · checked Sep 12, 2026
20	HVJ Associates	Indirect evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	51-200	199 contacts →
	Indirect evidence “Completing public infrastructure projects comes with tremendous pressure to serve the public while completing each project on-time and on-budget.” Source: RevenueBase Database · checked Sep 12, 2026
21	IDS Engineering Group	Partial evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	51-200	182 contacts →
	Partial evidence “Founded in 1970, IDS Engineering Group is a Houston-based civil engineering and surveying firm with over five decades of experience delivering infrastructure solutions for public…” Source: RevenueBase Database · checked Sep 12, 2026
22	Zentech Incorporated	Strong evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	51-200	181 contacts →
	Strong evidence “Zentech, Inc, an engineering consulting and software development company, headquartered in Houston, TX, is comprised of experienced professionals specializing in providing…” Source: RevenueBase Database · checked Sep 12, 2026
23	PPI Quality & Engineering, LLC	Partial evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	201-500	147 contacts →
	Partial evidence “PPI Quality & Engineering, a member of the Kiwa group of companies, saves its clients millions by providing economic solutions for complicated projects for the renewable energy…” Source: RevenueBase Database · checked Sep 12, 2026
24	Ceis Critical Energy Infrastructure Services	Indirect evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	201-500	145 contacts →
	Indirect evidence “Critical Energy Infrastructure Services (CEIS) is a nationally recognized leader in delivering strategic project solutions that support America’s energy infrastructure and…” Source: RevenueBase Database · checked Sep 12, 2026
25	Shah Smith & Associates, INC	Strong evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	51-200	134 contacts →
	Strong evidence “Shah Smith & Associates, Inc.(SSA) is a 120+ employee Mechanical, Electrical, and Plumbing (MEP) consulting engineering firm with offices in Houston, Austin & Dallas.” Source: RevenueBase Database · checked Sep 12, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: engineering consulting firms. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names engineering consulting firms.
Partial evidence: Its own public description names part of engineering consulting firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name engineering consulting firms. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 528 engineering consulting firms based in Houston, United States

See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 10,006 reachable decision-makers.

Free signup · no credit card

View the full list →

Engineering consulting firms based in Houston, United States at a glance

As of Sep 12, 2026

40.4%Verified-email coverage

40.0%Mobile-number coverage

46.9Average contacts per company

11-50Median size (employees)

100.6%Largest-city concentration · Houston

Sep 12, 2026Page data refreshed

Companies by employee count

1-10

228

11-50

203

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

Freshness & accuracy

How recently the business emails were verified and the company information checked

Email last verified

Median 14.0d

8,4670–30

1,41131–60

4861–90

690–180

74180+

Company record updated

Median 75.0d

00–30

10,04631–60

11,08861–90

2,43390–180

1,171180+

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among engineering consulting firms, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in Houston, United States whose own description of what they do matches “engineering consulting firms”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names engineering consulting firms), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among engineering consulting firms, and records with no verified work email. Companies headquartered outside Houston are excluded even when they keep an office there.
Match quality: In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
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 listed company carries at least one verified work email, 10,006 across the full list. 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 12, 2026. Lists refresh periodically as the graph is re-checked.
Corrections: Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Engineering consulting firms by metro in the United States

Engineering consulting firms in Houston531
Engineering consulting firms in New York397
Engineering consulting firms in Austin206
Engineering consulting firms in Miami180
Engineering consulting firms in Dallas178
Engineering consulting firms in Chicago177
Engineering consulting firms in San Diego172
Engineering consulting firms in Tampa170

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names engineering consulting firms, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many engineering consulting firms are there based in Houston, United States?

RevenueBase identified 528 engineering consulting firms headquartered in Houston, United States as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

LJA, headquartered in Houston, tops this list with the largest team on record.

Which city has the most engineering consulting firms?

Houston leads with 531 headquartered companies, followed by New York (397) and Austin (206).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 10,006 verified decision-maker contacts tracked across these 528 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 12, 2026.

Ready to reach these companies? Verified emails and direct dials for all 528 engineering consulting firms based in Houston, United States. Start with a free account, no credit card.

Download this list →

Related lists

Engineering consulting firms by geography

Browse the directory

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 Smart Search, 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.