What Wiertsema & Partners does

Wiertsema & Partners is a Dutch geotechnical engineering consultancy founded in 1979 and headquartered in Tolbert, Netherlands. The firm delivers integrated subsurface services across four lines: ground investigation via drilling and sounding, geotechnical laboratory testing through subsidiary Geolab Wiertsema, long-term geomonitoring, and advisory. It serves public-sector clients — Rijkswaterstaat, provincial authorities, water boards, and municipalities executing major infrastructure programs such as the Haringvlietbrug and IJsselmeerdijk dike reinforcement under Waterveiligheid 2030 — alongside construction companies, architects, and private individuals, with more than 3,000 clients on its books. Onshore and offshore capabilities are extended through subsidiary Marine Sampling Holland, and the firm participates in the NNOW offshore wind cluster to access marine energy work.

The firm operates proprietary GeoICT platforms GeoLoket and Profiler that give clients digital access to geotechnical data and 3D subsurface visualization. These platforms sit atop decades of proprietary investigation data and an in-house accredited laboratory, creating a domain-specific software and data stack that pairs with field services. Certifications across VCA**, ISO, BRL, PSO, CO2-Prestatieladder, and Kiwa NEN Safety prequalify the firm for Dutch public tenders, and membership in industry bodies VOTB and SIKB supports standards alignment.

Revenue is generated through project-based fees for field investigations, lab testing, monitoring, and advisory services, supplemented by recurring engagement with public-sector framework contracts. The customer base is anchored by large Dutch infrastructure authorities and supplemented by a long tail of 3,000+ smaller clients, with the Jong Talent Groep traineeship program sustaining headcount expansion.

Name

Wiertsema & Partners

Legal name

Raadgevend Ingenieursbureau Wiertsema & Partners B.V.

Website

https://wiertsema.nl

Company type

Private

Founded year

1979

Operating status

Operating

Headcount range

51–100 employees

Short description

Wiertsema & Partners is a Dutch geotechnical engineering consultancy, founded 1979, providing ground investigation, lab testing, geomonitoring, and advisory to Rijkswaterstaat, water boards, municipalities, construction firms, and private clients via proprietary GeoICT platforms.

Ownership category

akta.pro rank

Product category

Geotechnical Engineering Services

NAICS

Testing Laboratories and Services (54138), Architectural, Engineering, and Related Services (5413), Environmental Consulting Services (54162)

SIC

Services-Engineering Services (8711), Services-Testing Laboratories (8734)

akta.pro primary industry

Geotechnical Investigation & Site Characterization (Boreholes, In-situ Testing, Lab Testing) (IMAFAOAG)

akta.pro secondary industries

Geotechnical Design, Engineering & Consulting (Analysis, Design, Peer Review) (IMAFAOAK), Geotechnical & Subsurface Engineering Consulting (BPAHAIAB), Geotechnical Site Investigation & Engineering Geology (Borings, Lab Testing) (EUAHAFAE)

Keywords

• Geotechnical engineering services
• Ground investigation
• Soil research
• Geotechnical laboratory testing
• Geo-environmental consulting

Headquarters

HQ city

Tolbert

HQ country

Netherlands

HQ region

Europe

Offices2 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. Geotechnical Investigation Services: Project-based professional services including soil investigations (sonderingen/boringen), laboratory testing, monitoring, and advisory services. Revenue is generated through direct contracts with clients for specific geotechnical research projects. Services are provided both on land and offshore.

Pricing tiers

Go-to-market motion2 records

Distribution channels3 records

Marketing channels4 records

Core offering

Wiertsema & Partners is a geotechnical engineering consultancy that performs field-based ground investigations (drilling, sounding, sampling), in-house laboratory testing, geomonitoring, and advisory services for construction and infrastructure projects. Operations span onshore, inland waters, and offshore, serving government bodies, construction firms, architects, and private clients across the Netherlands and internationally. The firm also operates proprietary digital platforms (GeoLoket, Profiler) for subsurface data management, BRO compliance, and 3D underground modeling.

Product overview

Wiertsema & Partners operates as a geotechnical engineering bureau offering an integrated suite of field investigation, laboratory analysis, monitoring, consulting, and digital data services. The portfolio centers on five interconnected offerings: Grondonderzoek (ground investigation via drilling and sounding), Geolab Wiertsema (the company's own geotechnical laboratory), Geomonitoring (instrumentation and measurements during construction), Advies (in-house geotechnical and environmental consulting), and GeoICT (encompassing the GeoLoket online platform and Profiler software for subsurface data management and BRO submissions). The company serves onshore, inland water, and offshore projects across the Netherlands.

Differentiator

Problem solved

Functional benefit

Brands

• Geolab Wiertsema: High-profile geotechnical laboratory operated by Wiertsema & Partners
• Marine Sampling Holland

Products and services

• Grondonderzoek Geotechnical ground research involving drilling and sounding operations to map soil properties, conducted on land and water using specialized equipment. Designed for infrastructure, construction, and environmental projects.
• Geolab Wiertsema In-house geotechnical laboratory performing soil classification, index testing, strength testing (compression, DSS, CRS), and thermal resistance (g-waarde) measurements for subsurface characterization. Available to internal projects and external clients.
• Geomonitoring Monitoring services for geotechnical projects including groundwater level monitoring, settlement measurements, vibration monitoring, crack monitoring, and dike profile surveying to support construction and infrastructure projects.
• Advies Geotechnical, geohydrological, and environmental consulting services provided in-house, combining field execution with analysis for integrated project support for construction and infrastructure clients.
• GeoICT (GeoLoket & Profiler) Digital data and ICT services including the GeoLoket online platform and Profiler software for 3D subsurface modeling, data processing, and BRO (Basisregistratie Ondergrond) submissions. Provides online access to geotechnical data 24/7.

Quantifiable outcome

• Over 17 kilometers of dijk investigated for IJsselmeerdijk reinforcement project
• +2 more outcomes

Named customers5 records

Segments3 records

Ideal customer profiles2 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature4 records

Partnerships

Six partnerships are on record, tiered core and minor.

• Geolab WiertsemacoreOthersA wholly-owned subsidiary operating as a high-quality geotechnical laboratory in the Netherlands. Part of the Wiertsema & Partners group, providing in-house laboratory testing capabilities for soil classification, strength testing, and specialized measurements.
• Marine Sampling HollandcoreOthersA sister company under the same corporate group, specializing in marine sampling services. Provides complementary offshore capabilities for the Wiertsema & Partners group.
• VOTB (Vereniging Ondernemers Technisch Bodemonderzoek)coreStrategic or Co-development PartnerProfessional association of companies in technical soil research. Wiertsema & Partners is a member and actively participates in the VOTB Sustainability Commission to promote sustainability and reduce CO2 emissions within the sector.
• NNOW (Northern Netherlands Offshore Wind)minorOthersIndustry association for offshore wind in the Northern Netherlands region. Wiertsema & Partners is a member, indicating involvement in the offshore wind sector.
• SIKB (Stichting Infrastructuur Kwaliteitsborging Bodembeheer)coreOthersFoundation for quality assurance of soil management infrastructure. Wiertsema & Partners holds BRL (Beoordelingsrichtlijn) certification through this organization, demonstrating compliance with quality standards.
• Artesia Water Research UnlimitedminorStrategic or Co-development PartnerWater research company listed as a partner on the Wiertsema & Partners website. The nature of the partnership appears to be collaborative, likely involving complementary expertise in water-related geotechnical investigations.

Scale indicators4 records

Recent moves1 record

Expansion highlights5 records

Broad incumbents

• COWI: Danish engineering consultancy with bridge, tunnel, marine, and geotechnical capabilities. Comparable on offshore and infrastructure ground investigation; broader international footprint than Wiertsema.
• Arcadis: Global design and engineering consultancy with significant Dutch geotechnical and environmental practices. Competes on larger integrated infrastructure assignments in the Netherlands.
• Sweco: European engineering consultancy with geotechnical, water, and environmental practices. Active in Dutch infrastructure market with broader geographic and service-line reach than Wiertsema.
• Fugro: Global Dutch-origin geotechnical, geoscience, and survey firm. Comparably provides soil investigation, laboratory testing, and offshore site characterization at much larger scale; Wiertsema competes for local Dutch project scopes.

Direct peers

• Movares: Dutch engineering consultancy focused on rail, infrastructure, and geotechnical work. Directly comparable on Dutch infrastructure ground investigation and monitoring projects.
• TAUW: Dutch environmental and geotechnical consultancy. Listed as a Wiertsema customer but also operates competing ground investigation and soil research services for Dutch infrastructure projects.
• Antea Group: Dutch engineering and environmental consultancy with geotechnical investigation and BRO-compliant data capabilities. Directly comparable in soil research, environmental consulting, and infrastructure clients.
• Witteveen+Bos: Dutch engineering consultancy with strong water, soil, and infrastructure practice. Directly comparable on Dutch geotechnical advisory and dijk/water safety projects that overlap Wiertsema's core market.
• Royal HaskoningDHV: Major Dutch engineering consultancy covering geotechnical, environmental, and water management work. Competes for the same Rijkswaterstaat and water-board contracts Wiertsema serves.

Regional players

• Terracon Consultants: Large US-based geotechnical and environmental consultancy offering the same suite of field investigation, laboratory testing, and materials services. Useful US comparable for service-mix and operating model.

Market position

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

Compliance7 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

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 Wiertsema & Partners