Company lists · Data refreshed September 2026

Top 25 Site investigation companies worldwide

Name: Site investigation companies worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 22, 2026 8,427 companies tracked

RevenueBase identified 8,427 site investigation companies worldwide as of September 2026 and tracks 132,263 professional contacts across them, including 44,099 with verified work emails. The United States is the largest market and Sao Paulo the largest hub.

This list covers site investigation companies worldwide, 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 22, 2026. Country and city lists for site investigation companies follow the table.

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 22, 2026 86% judged on-target in blind review

8,427Companies

132,263Contacts tracked

44,099Verified emails

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The 25 largest site investigation companies worldwide

Ranked by team size

Top 25 of 8,427 site investigation companies worldwide, ranked by team size, largest first. Data refreshed Sep 22, 2026. RevenueBase Smart Search rates how each company's information relates to site investigation companies: 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	Terracon	Indirect evidence	Olathe, KS, United StatesHQ checked Sep 22, 2026	5,001-10,000	6,113 contacts →
	Indirect evidence “Terracon is a 100 percent employee-owned consulting engineering firm providing quality services to clients.” Source: RevenueBase Database · checked Sep 22, 2026
2	Keller	Indirect evidence	London, United KingdomHQ checked Sep 22, 2026	5,001-10,000	3,960 contacts →
	Indirect evidence “Every day, people around the world live, work and play on ground prepared by Keller, the world's largest geotechnical specialist contractor.” Source: RevenueBase Database · checked Sep 22, 2026
3	ECS Group Of Companies	Indirect evidence	Chantilly, VA, United StatesHQ checked Sep 22, 2026	1,001-5,000	2,210 contacts →
	Indirect evidence “ECS Group of Companies is a Chantilly, VA-based consulting engineering firm.” Source: RevenueBase Database · checked Sep 22, 2026
4	SEP Engineers	Partial evidence	Skelmersdale, United KingdomHQ checked Sep 22, 2026	n/a	1,837 contacts →
	Partial evidence “Established in 1986, SEP has been the industry’s leader for site engineering, surveying and management solutions for over thirty years, providing vital services, resources and…” Source: RevenueBase Database · checked Sep 22, 2026
5	UES	Indirect evidence	Orlando, FL, United StatesHQ checked Sep 22, 2026	1,001-5,000	1,595 contacts →
	Indirect evidence “UES provides professional engineering, environmental, testing and inspection services to clients across the United States.” Source: RevenueBase Database · checked Sep 22, 2026
6	Arab Center For Engineering Studies	Strong evidence	Amman, JordanHQ checked Sep 22, 2026	1,001-5,000	1,476 contacts →
	Strong evidence “At ACES, we offer a wide range of specialized engineering services including site and geotechnical investigation, materials technology and testing, quality control of projects…” Source: RevenueBase Database · checked Sep 22, 2026
7	Soletanche Bachy	Indirect evidence	Rueil-malmaison, FranceHQ checked Sep 22, 2026	5,001-10,000	1,222 contacts →
	Indirect evidence “Soletanche Bachy is a world benchmark in foundations and soil technologies, and is involved in over projects every year.” Source: RevenueBase Database · checked Sep 22, 2026
8	GZA Geoenvironmental, INC	Indirect evidence	Norwood, MA, United StatesHQ checked Sep 22, 2026	501-1,000	880 contacts →
	Indirect evidence “Founded in 1964 as a soils and foundations specialty consultant, GZA GeoEnvironmental, Inc.(GZA) has grown into a full-service company providing its clients with highly…” Source: RevenueBase Database · checked Sep 22, 2026
9	BGC Engineering INC	Indirect evidence	Vancouver, BC, CanadaHQ checked Sep 22, 2026	501-1,000	798 contacts →
	Indirect evidence “BGC Engineering is an international consulting firm that provides professional services in applied earth sciences.” Source: RevenueBase Database · checked Sep 22, 2026
10	Schnabel Engineering	Indirect evidence	Glen Allen, VA, United StatesHQ checked Sep 22, 2026	501-1,000	707 contacts →
	Indirect evidence “Schnabel is a trusted partner in building the foundation for project success.” Source: RevenueBase Database · checked Sep 22, 2026
11	Tower Engineering Professionals	Indirect evidence	Raleigh, NC, United StatesHQ checked Sep 22, 2026	1,001-5,000	707 contacts →
	Indirect evidence “Tower Engineer Professionals was founded in 1997 by two tower-climbing engineers.” Source: RevenueBase Database · checked Sep 22, 2026
12	Pt. Anindya Wiraputra Konsult	Indirect evidence	Jakarta, IndonesiaHQ checked Sep 22, 2026	1,001-5,000	623 contacts →
	Indirect evidence “ANINDYA is an independent surveying company that provides quality and quantity superintending service for the coal and minerals industry, the oil and gas sector as well as marine…” Source: RevenueBase Database · checked Sep 22, 2026
13	Neel-Schaffer, INC	Indirect evidence	Jackson, MS, United StatesHQ checked Sep 22, 2026	501-1,000	591 contacts →
	Indirect evidence “Neel-Schaffer is a multi-disciplined engineering, planning and construction management firm that was founded in 1983 and today is one of the largest private, employee-owned…” Source: RevenueBase Database · checked Sep 22, 2026
14	Sondotécnica Engenharia	Indirect evidence	Rio De Janeiro, BrazilHQ checked Sep 22, 2026	201-500	588 contacts →
	Indirect evidence “Sondotécnica was founded in 1954.” Source: RevenueBase Database · checked Sep 22, 2026
15	Raba Kistner, INC	Indirect evidence	San Antonio, TX, United StatesHQ checked Sep 22, 2026	501-1,000	582 contacts →
	Indirect evidence “Founded in 1968, Raba Kistner Inc.” Source: RevenueBase Database · checked Sep 22, 2026
16	Nova Engineering And Environmental, LLC	Indirect evidence	Kennesaw, GA, United StatesHQ checked Sep 22, 2026	501-1,000	518 contacts →
	Indirect evidence “Established in 1996, NOVA was originally founded to provide Environmental Consulting, Geotechnical Engineering, and Construction Materials Testing and Inspection services to the…” Source: RevenueBase Database · checked Sep 22, 2026
17	Tectonic Engineering Consultants, Geologists & Land Surveyors, D.P.C	Indirect evidence	Mountainville, United StatesHQ checked Sep 22, 2026	501-1,000	487 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 22, 2026
18	Entact, LLC	Indirect evidence	Westmont, IL, United StatesHQ checked Sep 22, 2026	501-1,000	483 contacts →
	Indirect evidence “ENTACT is the partner of choice in solving our customer's most complex environmental remediation and geotechnical infrastructure challenges.” Source: RevenueBase Database · checked Sep 22, 2026
19	Thurber Engineering LTD	Indirect evidence	Edmonton, AB, CanadaHQ checked Sep 22, 2026	501-1,000	480 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 22, 2026
20	GEO	Indirect evidence	Kgs. Lyngby (copenhagen), DenmarkHQ checked Sep 22, 2026	201-500	468 contacts →
	Indirect evidence “Founded in 1943, Geo is a market leading engineering consultancy company and contractor, specialised within the fields of geotechnical and environmental engineering (geoteknik og…” Source: RevenueBase Database · checked Sep 22, 2026
21	Douglas Partners	Indirect evidence	West Ryde, AustraliaHQ checked Sep 22, 2026	501-1,000	466 contacts →
	Indirect evidence “Welcome to Douglas Partners Pty Ltd, a leading engineering consultancy specialising in geotechnics, rock mechanics, environment, groundwater, earthworks and geophysics.” Source: RevenueBase Database · checked Sep 22, 2026
22	Geo-Technology Associates, Inc. GTA	Indirect evidence	Abingdon, MD, United KingdomHQ checked Sep 22, 2026	501-1,000	460 contacts →
	Indirect evidence “Geo-Technology Associates, Inc.(GTA) proudly celebrates more than 40 years of service, backed by a team of 600+ professionals-including geotechnical engineers, environmental…” Source: RevenueBase Database · checked Sep 22, 2026
23	L&t Geostructure	Indirect evidence	Chennai, IndiaHQ checked Sep 22, 2026	501-1,000	458 contacts →
	Indirect evidence “Overview In 2012, L&T acquired a huge fleet of sophisticated foundation equipment and L&T GeoStructure - a unique legal business entity, was formed to focus, capture and build…” Source: RevenueBase Database · checked Sep 22, 2026
24	Ninyo & Moore, A Socotec Company	Indirect evidence	San Diego, CA, United StatesHQ checked Sep 22, 2026	501-1,000	449 contacts →
	Indirect evidence “Ninyo & Moore was acquired by SOCOTEC US.” Source: RevenueBase Database · checked Sep 22, 2026
25	Minova	Indirect evidence	Greenwood Village, CO, United StatesHQ checked Sep 22, 2026	1,001-5,000	449 contacts →
	Indirect evidence “Minova is an industry leader of ground support and geotechnical solutions for mining, tunnelling and surface ground engineering projects.” Source: RevenueBase Database · checked Sep 22, 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: site investigation companies. 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 site investigation companies.
Partial evidence: Its own public description names part of site investigation companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name site investigation companies. 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 8,427 site investigation companies worldwide

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Site investigation companies worldwide at a glance

As of Sep 22, 2026

33.3%Verified-email coverage

15.7Average contacts per company

11-50Median size (employees)

1.0%Largest-city concentration · Sao Paulo

Sep 22, 2026Page data refreshed

Companies by employee count

1-10

4,012

11-50

3,000

51-200

1,035

201-500

226

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency is reported on each country list linked below.

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 site investigation companies, 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.
Coverage: Every country. Country and city lists for site investigation companies are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “site investigation companies”. 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 site investigation companies), 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 site investigation companies, and records with no verified work email.
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, 44,099 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 22, 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.

Site investigation companies by location

34 lists · largest first

Every Site investigation companies list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.

Countries

Cities

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 site investigation companies, 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 site investigation companies are there worldwide?

RevenueBase identified 8,427 site investigation companies worldwide 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?

Terracon, headquartered in Olathe, tops this list with the largest team on record.

Which country has the most site investigation companies?

The United States leads with 1,684 companies, followed by Brazil (699) and the United Kingdom (559). Every site investigation companies list by country and city is linked on this page.

Which city has the most site investigation companies?

Sao Paulo leads with 86 headquartered companies, followed by Belo Horizonte (78) and Tehran (49).

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 44,099 verified decision-maker contacts tracked across these 8,427 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 22, 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 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.