Your No. 1 Choice for Site Investigations in Northern Germany
To Ensure Your Construction Project Is on Solid Ground
We’ll handle your site investigation both on land and in water so you can get started on your construction project right away
The foundation for cost-effective and safe construction is a proper soil investigation.
The team of experts at THADE GERDES is here to support you:
Professional—even in tight spaces and on the water!
Is your construction site hard to access? No problem for the team of experts at THADE GERDES. With specialized machinery, equipment, and more than 120 years of experience, our drilling experts are equally at home on land and water.
Until the project begins and beyond
Not every type of soil is suitable for construction without further investigation.
That’s why THADE GERDES not only provides thorough site investigations but also deep foundations using bored piles, if necessary.
Everything you need for a safe, timely, and cost-effective project launch!
Our References for Site Investigation
SuedLink 2020–2023
Site investigations for a TenneT energy transmission line. Pressure tests, dry drilling, groundwater monitoring wells, and small-diameter percussion drilling.
Dornumersiel to Baltrum 2023
Site investigations on the mainland, in the Wadden Sea, and on the island of Baltrum for the onshore connection of wind farms in the North Sea, commissioned by TenneT Offshore GmbH. Site investigations involving cone penetration tests and dry drilling to a depth of up to 40 meters. Special requirements due to the work being carried out in the ecologically highly sensitive Wadden Sea National Park and the logistical challenges posed by the car-free island of Baltrum.
Hamburg U4 2023
Site investigation on the Elbe River in Hamburg. Work conducted in two shifts from a floating platform. Dry drilling up to 60 m and cone penetration tests.
3 Criteria for a Successful Project
Assessing the site conditions for your project is the foundation for reliable planning of all subsequent steps.
1. A provider with experience
To ensure that your site investigation is successful, your service provider should:
- Work only with trained professionals
- Comply with current environmental and occupational safety standards
- be familiar with the soils in your region
- Have experience with projects of this size
2. Comprehensive Site Assessment
You need recommendations and design parameters for your further planning. Your drilling contractor will provide samples and measurement data.
Reputable drilling companies work with external specialists who analyze the data and prepare your report.
3. Support until construction begins
Whether it’s a public-sector client, a major project client, or a private homebuilder: A good provider handles all projects with the same level of care.
→ You can find all of this at THADE GERDES!
From drilling to test boring—
THADE GERDES makes it happen
Successful construction projects require a solid foundation.
We specialize in large-scale infrastructure projects in northern Germany.
Our focus is on investigating the subsoil for power cable routes, highways, bypasses, coastal protection measures, and waterways.
Our roots lie in smaller projects such as surveys for buildings, wind farms, bridges, and similar planned structures.
We are also delighted to serve this market.
Our core competencies lie in performing dry drilling and pressure testing both on land and from the water.
In this area, we are well-equipped with new equipment and a relatively young team.
Although our headquarters are located in East Frisia, we serve customers throughout Germany.
We offer you:
Our soil investigation drilling is performed in accordance with DIN EN ISO 22475.
This allows us to obtain all the necessary information about your building site and its stratigraphic structure. External engineers can analyze the information we have gathered and develop foundation designs.
For drilling surveys, we have been working for years with qualified subcontractors who specialize in this type of soil investigation drilling.
Pile driving tests and simple pile depth measurements are also among the services provided by these subcontractors.
The cone penetration test (CPT) is a method for soil investigation in accordance with DIN EN ISO 22476. In this test, a measuring head attached to a rod is pressed into the ground at a constant speed. The tip pressure and skin friction are measured during this process. Force is measured using an electronic recording system. The measured values allow conclusions to be drawn about the underlying soil and its compaction density. The measurement curves are displayed in situ on a laptop and can be interpreted immediately.
We offer all of this—both on land and on the water!
You’re probably wondering how that’s possible from the water …
At THADE GERDES, we make it happen!
With our specially designed floating equipment, such as our pontoon.
Collaboration Process
1. Initial consultation (15 minutes)
During a no-obligation initial consultation, we’ll discuss the initial details of your project.
→ Do you already know what tests you need and have a scope of work? Great! We’ll provide you with a no-obligation quote for the work to be performed.
→ Are you planning your own small-scale project and aren’t sure what information you need about “your” building lot? We’d be happy to advise you and, if you’d like, put you in touch with external specialists.
2. Offer
Based on all the information you provide, we’ll prepare a quote for you promptly—and we’ll break down the costs so you have a clear overview of all expenses, with no hidden costs, of course!
3. Let's get started
Does this offer sound like a good fit for you? Then we can get started on your project right away. We’ll keep you updated on all project developments!
Ready for your site investigation?
Then sign up now for an initial consultation! We’ll advise you and plan the right site investigation for you!
Click on “Request Now” or call us directly:
04931 938460
For more than 120 years: Insightful & Thought-Provoking
Since the company was founded in 1900, THADE GERDES has made a name for itself as a reliable drilling company in northern Germany and far beyond the borders of East Frisia.
Rimt Wortberg
Managing Partner, Bachelor of Science in Civil Engineering (TU)
In addition to his duties as managing director, he is responsible for sales, public relations, and financial management.
Hauke Anbergen
Managing Partner, Ph.D. in Civil Engineering
In addition to his duties as managing director, he is overseeing the establishment of another company location in the Hamburg area and our projects in that region.
Erwin Fisser
Authorized Signatory, Bachelor of Engineering in Mechanical Engineering (University of Applied Sciences)
Our expert in the technical department and head of machinery and vehicle fleet, transportation, logistics, and materials.
Imke Hoefer-Aeils
Authorized Signatory, Bachelor of Science in Civil Engineering (University of Applied Sciences)
Our expert in operations, operational management, billing, and documentation.
Felix Harms
M.Sc. in Civil Engineering
Our department head for piles and cost estimation for all projects.
Sonja Büscher
Head of the Secretariat
Your point of contact for all your questions and concerns.
Would you like to join our team?
Frequently Asked Questions
Why is a soil investigation important for my project?
A site investigation determines whether the subsoil is suitable for your project. It provides the essential data needed to identify potential risks and optimize the costs of your building’s foundation. A site investigation is therefore a crucial prerequisite for the stability of your construction project.
What is the typical process for a soil investigation?
A site investigation involves drilling with soil sampling and test pits to determine the strength of the subsoil. Upon your request, we will analyze the soil samples and prepare a report containing the investigation results as well as recommendations for the construction project.
What criteria should I consider when choosing a provider for soil investigation services?
How long will it take to receive the results of my soil investigation?
How can I make sure that my building site is stable enough?
What are the most common challenges in site investigations and
, and how do you address them?
, and how do you address them?
Which regions does THADE GERDES cover for site investigations?
What's the fastest way to get a quote from THADE GERDES?
If you already have the necessary documents, simply send us a request at info@thade-gerdes.de. If not, please feel free to call us.
Do you have any other questions? Just get in touch with us, and we’ll call you back as soon as possible!
Why is a soil investigation important for my project?
A site investigation determines whether the subsoil is suitable for your project. It provides the essential data needed to identify potential risks and optimize the costs of your building’s foundation. A site investigation is therefore a crucial prerequisite for the stability of your construction project.
What is the typical process for a soil investigation?
A site investigation involves drilling with soil sampling and test pits to determine the strength of the subsoil. Upon your request, we will analyze the soil samples and prepare a report containing the investigation results as well as recommendations for the construction project.
What criteria should I consider when choosing a provider for soil investigation services?
How long will it take to receive the results of my soil investigation?
How can I make sure that my building site is stable enough?
What are the most common challenges in site investigations, and how do you address them?
Which regions does THADE GERDES cover for site investigations?
What's the fastest way to get a quote from THADE GERDES?
If you already have the necessary documents, simply send us a request at info@thade-gerdes.de. If not, please feel free to call us.
Do you have any other questions? Just get in touch with us, and we’ll call you back as soon as possible!