Sol Essais

What Sol Essais does

Sol Essais is a French geotechnical engineering firm (BET Géotechnique) founded in 1954 by Louis Parez, inventor of the static penetrometer with hydraulic measurement. The company provides end-to-end geotechnical services across the Provence-Alpes-Côte d'Azur region, the Principality of Monaco, and Corsica, operating from two regional agencies: its headquarters in Aix-en-Provence and a Côte d'Azur office in Sophia-Antipolis (Biot). Services are organized around the standardized NF P 94-500 mission framework (G1 through G5), covering preliminary site studies, design-phase investigations, execution studies, supervision, and geotechnical diagnosis.

The firm's core technical capabilities span four integrated domains: Sondages (drilling and surveys, with 15 permanent teams executing 25-30 km of cored, destructive, pressiometric, and penetrometer drilling annually), Laboratoires (in-house geotechnical testing laboratories running over 1,000 shear and compressibility tests per year), Ingénierie (soil analysis, foundation design, retaining structures, and soil-structure interaction), and Instrumentation (inclinometric, extensometric, settlement, crack, and piezometric monitoring). Specialized offerings extend to natural hazard risk assessment under Risk Prevention Plans, geothermal drilling and thermal response testing, hydrogeological studies, and rehabilitation engineering for civil structures and energy piles.

Sol Essais operates a project-based professional services model, with pricing tied to scope, complexity, and standardized mission types. It sells directly to public and private project owners (maîtres d'ouvrages), design firms (maîtres d'œuvre), construction companies (BTP), promoters, insurance and judicial experts, and individual clients. The company is structured as a SAS (Société par Actions Simplifiée) and has been employee-owned since 2001, following the departure of Jean-Pierre Mascarelli. It maintains a wholly-owned environmental studies subsidiary, SOL EXPERTISE ENVIRONNEMENT (created 2012), and absorbed its sister company Sol-2E in 2021. Notable reference projects include Tramway de Nice, Polygone Riviera, Tour Simona, Tour Odéon, Mucem, Cap 3000, TGV Sud-Est, Aéroport de Nice, and Port de Nice.

Name

Sol Essais

Legal name

SOL ESSAIS

Website

https://sol-essais.fr

Company type

Private

Founded year

1954

Operating status

Operating

Headcount range

101–250 employees

Short description

Sol Essais is a French geotechnical engineering firm founded in 1954, providing drilling, laboratory testing, instrumentation, and engineering services under NF P 94-500 standards to public and private construction project owners across PACA, Monaco, and Corsica.

Ownership category

akta.pro rank

Product category

Geotechnical Engineering Services

NAICS

Geophysical Surveying and Mapping Services (54136), Environmental Consulting Services (54162)

akta.pro primary industry

Dewatering & Groundwater Control (Wellpoints, Deep Wells, Cutoff Systems) (IMAFAOAF)

akta.pro secondary industries

Dewatering, Groundwater Control & Construction Hydrogeology (EUAHAFAG), Foundations & Geotechnical Works (Piles, Anchors, Ground Improvement) (EUAMAFAB), EIA/ESIA Documentation & Technical Studies (Air/Water/Noise/Traffic) (EUAHAAAC)

Keywords

• Geotechnical engineering services
• Soil investigations
• Foundation engineering
• Geotechnical laboratory testing
• Structural instrumentation monitoring

Headquarters

HQ city

Aix-en-provence

HQ country

France

HQ region

Europe

Offices2 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Infrastructure, Technology or R&D, Marketing or Sales, Others

Revenue model

1. Geotechnical Engineering Services: Professional services revenue from geotechnical studies, soil investigations, laboratory analysis, and instrumentation monitoring. Services structured according to NF P 94-500 standardized missions (G1-G5) covering the full construction project lifecycle from site study through execution supervision.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels1 record

Core offering

Sol Essais is a geotechnical engineering firm delivering end-to-end soil and construction services for public and private project owners in southeastern France. The core offering combines four operational pillars—Sondages (drilling/surveys), Laboratoires (soil testing), Ingénierie (geotechnical engineering), and Instrumentation (monitoring)—delivered alongside standardized geotechnical study missions (G1-G5) under NF P 94-500. Specialized services in natural hazard management, geothermal, hydrogeology, and rehabilitation round out the portfolio, complemented by the SOL EXPERTISE ENVIRONNEMENT subsidiary for environmental studies.

Product overview

Sol Essais is a geotechnical engineering company (BET Géotechnique) offering a comprehensive suite of services for soil and construction projects. The core offerings include Sondages (geological drilling/surveys), Laboratoires (geotechnical testing laboratories), Ingénierie (engineering services), Instrumentation (monitoring), and standardized Études Géotechniques following NF P 94-500 (G1-G5 missions). Specialized services include natural hazard management, geothermal energy, hydrogeological studies, and rehabilitation engineering. A subsidiary, SOL EXPERTISE ENVIRONNEMENT, handles environmental studies. The company operates through regional agencies in Aix-en-Provence and Sophia-Antipolis, serving the PACA region, Monaco, and Corsica for over 60 years.

Differentiator

Problem solved

Functional benefit

Products and services

• Sondages (Geological Drilling and Surveys) Geological drilling and survey services including cored drilling, destructive drilling, pressiometric drilling, and penetrometer testing, conducted by 15 permanent teams capable of terrestrial or maritime intervention, performing 25-30 kilometers of surveys annually. For project owners, design firms, and construction companies requiring ground investigation in southeastern France.
• Laboratoires (Geotechnical Testing Laboratories) In-house geotechnical testing laboratories performing over 1,000 shear and compressibility tests annually, including identification tests, road tests, compressibility tests, and triaxial tests on soil samples. For construction clients requiring certified soil characterization.
• Ingénierie (Geotechnical Engineering Services) Geotechnical engineering services including soil analysis, foundation design, retaining structures, soil-structure interaction management, and expertise on structural damage for investigation of causes and remediation definition. For project owners, design firms, and construction companies executing building and infrastructure projects.
• Instrumentation (Structural and Geotechnical Monitoring) Structural and geotechnical monitoring services including inclinometric tests, extensometric tests, settlement monitoring, crack monitoring, hydrological surveillance, and piezometer measurements for compliance verification. For construction clients requiring ongoing project monitoring and compliance documentation.
• Études Géotechniques (Geotechnical Studies) - G1/G2/G3/G4/G5 Missions Standardized geotechnical study missions following NF P 94-500 norm: G1 (preliminary geotechnical study with site study and general construction principles phases), G2 (conception study with preliminary design, project, and tender phases), G3 (execution studies), G4 (geotechnical supervision), and G5 (geotechnical diagnosis). For public and private project owners across the construction lifecycle.
• Gestion des Aléas Naturels (Natural Hazard Management) Risk assessment, mapping, and certification services within the framework of Risk Prevention Plans, including natural hazard studies and vulnerability reduction analysis. For public authorities and project owners requiring natural hazard risk compliance.
• Géothermie (Geothermal Energy Services) Geothermal drilling services at 150m depth, probe installation, and thermal response testing to evaluate soil geothermal potential. For construction clients integrating geothermal energy systems.
• Hydrogéologique (Hydrogeological Studies) 2D and 3D studies of underground water circulation, groundwater drawdown studies, and pumping tests. For project owners and engineering firms requiring groundwater analysis for construction projects.
• Réhabilitation (Rehabilitation Engineering) Renovation and transformation engineering for civil engineering structures and buildings, including earthworks, support structures, foundations, and energy piles. For construction clients and project owners undertaking rehabilitation projects.
• SOL EXPERTISE ENVIRONNEMENT (Subsidiary) Environmental studies subsidiary created in 2012, specializing in environmental assessment services. For project owners requiring environmental due diligence as part of construction projects.

Named customers12 records

Segments5 records

Ideal customer profiles5 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature2 records

Partnerships

Two partnerships are on record, tiered supporting.

• OPQIBIsupportingOthersOrganisme de Qualification de l'Ingénierie Bâtiment (OPQIBI) certification holder, indicating qualification in building engineering. This is a professional certification rather than a business partnership.
• QSEsupportingOthersQuality, Safety, Environment certification holder, demonstrating compliance with quality management and environmental/safety standards.

Scale indicators4 records

Recent moves13 records

Expansion highlights5 records

Broad incumbents

• AECOM: Global infrastructure consulting firm with geotechnical and environmental practices. Comparable on large public-infrastructure mandates, though broader in scope and far larger in scale.
• NGE (NGE Fondations): Major French construction group with a foundations and geotechnical subsidiary. Comparable customer base and overlapping geotechnical capabilities, but bundled within a national contractor.
• SOCOTEC: Major French TIC (testing, inspection, certification) group and parent of Ginger CEBTP. Overlaps Sol Essais's geotechnical mission work as part of a much broader infrastructure-services portfolio.
• Fugro: International geotechnical and subsurface-services provider with strong European operations. Comparable in subsurface-investigation and instrumentation capabilities, but at global scale and broader scope.
• Bureau Veritas: Global TIC incumbent with French construction-services operations including geotechnical and structural assessments. Comparable end-customers but a far broader service portfolio.

Direct peers

• Fondasol: Independent French geotechnical engineering firm specializing in soil studies, foundations, and ground improvement. Competes directly for the same maîtres d'ouvrage and design-firm clients on construction projects.
• Ginger CEBTP: Largest French geotechnical and civil-engineering testing firm (now part of SOCOTEC). Offers the same drilling, laboratory, and G1–G5 mission portfolio to public and private project owners across France — the closest national-scale direct competitor to Sol Essais.
• Hydrogéotechnique: French firm combining geotechnical and hydrogeological engineering services. Closely matches Sol Essais's combined drilling, laboratory, and hydrogeology offering for infrastructure and building projects.
• Antea Group: French environmental and geotechnical consulting firm offering site assessment, soil studies, and EIA services. Directly comparable given Sol Essais's environmental subsidiary and natural-hazard work.
• Terrasol (Setec group): French geotechnical engineering consultancy specializing in soil mechanics and foundation design for complex structures (high-rises, tunnels, ports). Comparable on the engineering/analysis side of Sol Essais's offering.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights6 records

Customer concentration

• LinkedInlinkedin.com/company/sol-essais

Revenue estimate

Valuation estimate

Number of profiles

Subsidiaries2 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Sol Essais