Company lists · Data refreshed September 2026

Top 25 Subsurface technical consulting firms based in France

Name: Subsurface technical consulting firms based in France
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 29, 2026 371 companies tracked

RevenueBase identified 371 subsurface technical consulting firms headquartered in France as of September 2026 and tracks 4,453 professional contacts across them, including 1,281 with verified work emails. Paris is the largest hub.

This list covers subsurface technical consulting firms headquartered in France, 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 29, 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 29, 2026 86% judged on-target in blind review

371Companies

4,453Contacts tracked

1,281Verified emails

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The 25 largest subsurface technical consulting firms based in France

Ranked by team size

Top 25 of 371 subsurface technical consulting firms based in France, ranked by team size, largest first. Data refreshed Sep 29, 2026. RevenueBase Smart Search rates how each company's information relates to subsurface technical 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	Groupe Géotec	Indirect evidence	Quetigny, FranceHQ checked Sep 29, 2026	501-1,000	441 contacts →
	Indirect evidence “Groupe Géotec, bureau d’études en ingénierie géotechnique et environnementale, créé en 1973, conseille l’ensemble des interlocuteurs de l’acte de construire : maîtres d’ouvrage…” Source: RevenueBase Database · checked Sep 29, 2026
2	Setec Hydratec	Indirect evidence	Paris, FranceHQ checked Sep 29, 2026	201-500	182 contacts →
	Indirect evidence “Bureau d’études techniques fondé en 1974, setec hydratec s’est positionné en tant qu’expert sur tous les sujets liés à l’ingénierie de l’eau et des sites et sols pollués, afin de…” Source: RevenueBase Database · checked Sep 29, 2026
3	Geotechnique SAS	Indirect evidence	Avignon, FranceHQ checked Sep 29, 2026	51-200	134 contacts →
	Indirect evidence “GEOTECHNIQUE SAS - Sciences de la Terre est un bureau d'études en ingénierie géotechnique qui apporte son savoir-faire à l'ensemble des protagonistes intervenant dans un projet de…” Source: RevenueBase Database · checked Sep 29, 2026
4	Temsol	Indirect evidence	Merignac Cedex, FranceHQ checked Sep 29, 2026	51-200	125 contacts →
	Indirect evidence “Temsol est reconnue depuis 50 ans comme le spécialiste dans les domaines de la géotechnique, des structures et de l’environnement.” Source: RevenueBase Database · checked Sep 29, 2026
5	Semofi	Indirect evidence	Villeneuve-le-roi, FranceHQ checked Sep 29, 2026	51-200	114 contacts →
	Indirect evidence “Filiale du Groupe SEMOFI, acteur majeur des filières géotechnique et SSP, SEMOFI est un bureau d’études dont la vocation est d’accompagner les collectivités territoriales…” Source: RevenueBase Database · checked Sep 29, 2026
6	SOL Solution SAS	Indirect evidence	Riom, FranceHQ checked Sep 29, 2026	51-200	65 contacts →
	Indirect evidence “Sol Solution is a geotechnical, geological, and geophysical engineering firm, established in 1992.” Source: RevenueBase Database · checked Sep 29, 2026
7	Geolia	Indirect evidence	Morangis, FranceHQ checked Sep 29, 2026	51-200	58 contacts →
	Indirect evidence “Bureau d'Etudes Géotechniques, Hydrogéologie et Sites et Sols Pollués, Ingénierie des sols et fondations.” Source: RevenueBase Database · checked Sep 29, 2026
8	KAÉNA	Indirect evidence	Saint Vincent De Mercuze, FranceHQ checked Sep 29, 2026	51-200	53 contacts →
	Indirect evidence “Bureau d'études géotechniques situé au coeur des Alpes (1 agence au Touvet et 1 agence à Annecy,1 agence à St Priest) ayant ses propres ateliers de sondages (5 foreuses dont 1…” Source: RevenueBase Database · checked Sep 29, 2026
9	Sage Ingenierie	Indirect evidence	Gières, FranceHQ checked Sep 29, 2026	51-200	51 contacts →
	Indirect evidence “La Société Alpine Géotechnique (SAGE Ingénierie) est un bureau d'études de sols indépendant (SAS) dont les services couvrent toute l’ingénierie géotechnique spécifique aux…” Source: RevenueBase Database · checked Sep 29, 2026
10	Hydroconsult Sarl	Partial evidence	Kervignac, FranceHQ checked Sep 29, 2026	11-50	49 contacts →
	Partial evidence “Hydroconsult is a recognized actor in worldwide Hydrographic and Geophysical Survey's assistance and Marine Consulting, with 20 years experience.” Source: RevenueBase Database · checked Sep 29, 2026
11	Gph, Bureau D'études Pour L'habitat	Indirect evidence	Challans, FranceHQ checked Sep 29, 2026	11-50	42 contacts →
	Indirect evidence “GPH est une entité du groupe NOVAM, au sein du pôle Habitat et géotechnique de l'habitat.” Source: RevenueBase Database · checked Sep 29, 2026
12	Fondouest	Indirect evidence	Longueville, FranceHQ checked Sep 29, 2026	51-200	42 contacts →
	Indirect evidence “FONDOUEST is a construction company based out of ZONE ARTISANALE 727 RUE DU PONT CE, LONGUEVILLE, France.” Source: RevenueBase Database · checked Sep 29, 2026
13	Geos Ingénieurs Conseils	Indirect evidence	Rueil-malmaison, FranceHQ checked Sep 29, 2026	11-50	42 contacts →
	Indirect evidence “GEOS Ingénieurs Conseils est un bureau de Conseils et d’Expertise spécialisé en géotechnique, regroupant 35 collaborateurs à Paris et Lyon, filiale du groupe national d’ingénierie…” Source: RevenueBase Database · checked Sep 29, 2026
14	Technosol	Indirect evidence	Ballainvilliers, FranceHQ checked Sep 29, 2026	51-200	42 contacts →
	Indirect evidence “TECHNOSOL est le bureau d'ingénierie géotechnique du Groupe GENGIS, Groupe indépendant d'ingénieries spécialisées en géosciences et structure.” Source: RevenueBase Database · checked Sep 29, 2026
15	Gexplore	Partial evidence	Ludres, FranceHQ checked Sep 29, 2026	11-50	41 contacts →
	Partial evidence “GexplOre \| Specialists in Geology, Geophysics, Well Logging & Mining Consultation GexplOre is a leader in geological exploration, providing consulting services and integrated…” Source: RevenueBase Database · checked Sep 29, 2026
16	Armasol	Indirect evidence	Réaumont, FranceHQ checked Sep 29, 2026	51-200	40 contacts →
	Indirect evidence “ARMASOL et ses bureaux d'études géotechniques implantés sur l'ensemble du territoire national vous accompagnent pour aménager et construire en toute sérénité.” Source: RevenueBase Database · checked Sep 29, 2026
17	Avesig	Indirect evidence	Paris, FranceHQ checked Sep 29, 2026	11-50	37 contacts →
	Indirect evidence “AVESIG est un Bureau d’études d’assistance technique et de conseils en Ingénierie Nous rendons simple et abordable ce qui paraît complexe et compliqué.” Source: RevenueBase Database · checked Sep 29, 2026
18	SOL Essais	Indirect evidence	Aix-en-provence, FranceHQ checked Sep 29, 2026	51-200	36 contacts →
	Indirect evidence “Depuis plus de 60 ans, SOL ESSAIS dispose d'une expertise en géotchnique pour apporter des solutions techniques grâce à ses ingénieurs spécialisés qui prennent appui sur les…” Source: RevenueBase Database · checked Sep 29, 2026
19	AERYS	Indirect evidence	Arcomps, FranceHQ checked Sep 29, 2026	51-200	36 contacts →
	Indirect evidence “SONDAGE GÉOTECHNIQUES : La géotechnique est l'étude de l'adaptation des ouvrages humains aux sols et roches formant le terrain naturel.” Source: RevenueBase Database · checked Sep 29, 2026
20	ICSEO	Indirect evidence	Semur En Auxois, FranceHQ checked Sep 29, 2026	51-200	35 contacts →
	Indirect evidence “ICSEO est un bureau d'études de sols, indépendant et de taille humaine répartis en plusieurs agences.” Source: RevenueBase Database · checked Sep 29, 2026
21	SOL Conseil	Indirect evidence	Massy, FranceHQ checked Sep 29, 2026	51-200	34 contacts →
	Indirect evidence “Avec plus de 40 ans de savoir-faire dans le domaine de la Géotechnique, SOL CONSEIL accompagne ses clients sur tous types de projets en bâtiment, génie civil, aménagements…” Source: RevenueBase Database · checked Sep 29, 2026
22	Saga Ingenierie	Indirect evidence	Grigny, FranceHQ checked Sep 29, 2026	11-50	29 contacts →
	Indirect evidence “À vos côtés, du sol jusqu’à l’horizon, pour tous vos projets géotechniques.” Source: RevenueBase Database · checked Sep 29, 2026
23	Structureo	Indirect evidence	Antony, FranceHQ checked Sep 29, 2026	11-50	28 contacts →
	Indirect evidence “STRUCTUREO est un bureau d'études structure et géotechnique qui intervient sur les bâtiments existants, réalisant diagnostics, études, conseils, instrumentation des ouvrages…” Source: RevenueBase Database · checked Sep 29, 2026
24	Ad2i	Indirect evidence	Aix En Pce, FranceHQ checked Sep 29, 2026	11-50	26 contacts →
	Indirect evidence “Les associés et salariés d'AD2i forment un bureau d'études techniques spécialisé dans l'ingénierie du bâtiment et dans l'aménagement des domaines skiables Nous intervenons…” Source: RevenueBase Database · checked Sep 29, 2026
25	Groupe Equaterre Géotechnique	Indirect evidence	Meythet - Annecy, FranceHQ checked Sep 29, 2026	51-200	23 contacts →
	Indirect evidence “Créé en 1995, il regroupe des compétences géotechniques établies depuis 1986.” Source: RevenueBase Database · checked Sep 29, 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: subsurface technical 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 subsurface technical consulting firms.
Partial evidence: Its own public description names part of subsurface technical consulting firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name subsurface technical 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 371 subsurface technical consulting firms based in France

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Subsurface technical consulting firms based in France at a glance

As of Sep 29, 2026

28.8%Verified-email coverage

12.0Average contacts per company

1-10Median size (employees)

6.5%Largest-city concentration · Paris

Sep 29, 2026Page data refreshed

Companies by employee count

1-10

243

11-50

51-200

201-500

501-1,000

1,001-5,000

Email recency for this list is measured worldwide rather than for France, so it is reported there. Company counts and contact totals on this page are exact for France, over 371 companies.

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 subsurface technical 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 France whose own description of what they do matches “subsurface technical 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 subsurface technical 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 subsurface technical consulting firms, and records with no verified work email. Companies headquartered outside France 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, 1,281 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 29, 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.

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 subsurface technical 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 subsurface technical consulting firms are there based in France?

RevenueBase identified 371 subsurface technical consulting firms headquartered in France 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?

Groupe Géotec, headquartered in France, tops this list with the largest team on record.

Which city has the most subsurface technical consulting firms?

Paris leads with 24 headquartered companies, followed by Nantes (6) and Montpellier (5).

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 1,281 verified decision-maker contacts tracked across these 371 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 29, 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.