Before you start a construction project, it’s worth taking a close look at the soil. This is because, especially in cases of soft soil, high groundwater levels, or highly variable soil layers such as clay, peat, or sand, a traditional shallow foundation is not sufficient to build a stable foundation. Instead, a deep foundation is needed to reliably transfer loads to deeper, stable layers—that is, to where true support can be found. Pile foundations have proven to be the most reliable method in this regard.
But which type of pile is best suited for your construction project depends on several factors: What is the soil composition? What exactly is to be built? What are the conditions at the construction site—cramped, accessible, or built-up? And last but not least: How much load does the foundation actually have to bear? Whether driven piles, bored piles, micropiles, or displacement piles: There are various types of pile foundations. The trick is choosing the right one for your project.
In this article, we’ll show you the different types of pile foundations, how they work, and which construction projects they’re best suited for. We’ll also include real-world examples, technical background information, and practical tips for your planning.
Table of Contents
Key Points at a Glance
Pile foundations are among the safest methods in civil engineering when the surface soil is not stable enough—for example, in cases of clay, sand, peat, or a high water table. They transfer the loads of a structure deep into stable soil layers via piles, thereby ensuring a permanently stable foundation.
Depending on the soil conditions, building type, and site conditions, various types of piles are used, ranging from driven piles and bored piles to micropiles and displacement piles. Pile foundations are particularly widespread in northern Germany, with its soft soils, in residential construction, industrial facilities, and coastal regions.
Choosing the right pile system depends on the soil survey, the load capacity, the available space, and the technical requirements. If you want to play it safe, seek advice early on from an experienced specialist company like Thade Gerdes.
What is a pile foundation?
Not every type of soil has the necessary bearing capacity to safely support a building. Especially in the case of soft or water-saturated soil layers, a traditional shallow foundation quickly reaches its limits. This is exactly where pile foundation come into play: They are among the deep foundations and transfer a building’s loads through slender, load-bearing piles to deeper, stable soil layers. This creates a foundation that remains secure even when the subsoil is soft or unstable.
How does a pile foundation differ from other deep foundation methods?
In the construction industry, there are several methods for laying foundations when the near-surface soil is not stable enough. In addition to pile foundations, these include well foundations and the diaphragm wall method. Each method works differently and has its own strengths and weaknesses. The following table provides a simple overview:
| Pile Foundation | Well foundation | Diaphragm wall method | |
| How It Works | Transfer of loads to deeper soil layers via piles | Load transfer via a sunk well shaft | Load-bearing or supporting concrete walls in the ground |
| Application | Structures on soft ground | Smaller structures, such as piers, or at shallow depths | Excavations, inner-city areas, high groundwater levels |
| Frequency | The most common type of deep foundation; standard in modern civil engineering | Rare; usually only used in special cases | Common in large-scale urban projects or underground parking garages |
When is a pile foundation necessary?
Pile foundations are always used when the surface soil does not provide sufficient bearing capacity or consists of very different layers. Typical examples are sites where peat, clay, sand, or silt alternate unevenly, as is the case, for example, in many coastal regions or in marshy areas . In such soils, a standard foundation can subside over time. This often leads to cracks in the masonry, tilting, or even the settlement of entire buildings.
Even when the water table is high or when soil conditions vary significantly, pile foundations are often the only way to ensure safety. They transfer the structure’s loads directly to deeper layers of the subsoil—where the soil is truly load-bearing.
The same applies to buildings that are particularly heavy or have a large footprint. Whether it’s bridge construction, multi-story residential buildings, or industrial facilities: wherever high loads are applied, a simple shallow foundation is usually no longer sufficient.
In addition, changing climate conditions are also altering soil conditions. Heavy rainfall, drought caused by heat, and rising groundwater levels are placing increasing strain on foundations. Pile foundations not only offer a technical solution here, but also provide a degree of long-term security for both private and public construction projects.
What are the advantages of pile foundations?
It is no coincidence that pile foundations are considered one of the most reliable methods in civil engineering. Whether for new construction, renovation, or special cases—this method offers a whole range of tangible advantages.
✔ Suitable for any type of soil
Whether loamy, peaty, or sandy, there’s hardly a soil type for which a suitable post option can’t be found. Thanks to the wide variety of post systems available, even challenging soil conditions can be safely utilized.
✔ Supports even heavy loads with ease
Even with heavy structures, such as industrial warehouses or multi-story buildings, a pile foundation reliably transfers the loads to deeper soil layers, thereby ensuring stability.
✔ Can be selected to suit the soil and structure
Depending on soil conditions and the planned use of the building, the pile type can be precisely tailored to the specific needs—ranging from vibration-free bored piles to rustic driven piles.
✔ Space-saving design
Pile foundations really come into their own on tight construction sites or in areas with dense neighboring development. They require less space than traditional foundations—a real advantage in urban areas.
✔ Time savings during construction
Many pile foundation methods can be implemented quickly, often without the need for extensive earthwork. If you want to get started quickly, pile foundations are the right choice for deep foundations.
✔ Lower follow-up costs due to settlement or damage
Choosing the wrong type of foundation often comes back to haunt you years later. Pile foundations reduce the risk of settlement, cracks, or tilting—and thus also lower maintenance and repair costs.
What types of pile foundations are there?
Depending on soil conditions, the type of building, and load-bearing requirements, various pile systems are used for deep foundations. The groundwater level, site accessibility, and available space also play a key role. The goal is the same for all methods: to transfer the structure’s loads to a point where the soil is stable enough to support them permanently—and that is usually several meters deeper than initially anticipated.
In practice, the following types of pile foundations have proven particularly effective:
Driven Piles
Driven piles are among the most traditional types of pile systems. They are driven forcefully into the ground using special machinery—one by one—until load-bearing soil layers are reached. This method works particularly well when the subsoil is not too soft and provides sufficient bearing capacity even at relatively shallow depths. Because the process is fast, it is very cost-effective, though it is also very noisy and involves noticeable vibrations. That is why driven piles are primarily used where there is ample space and noise is not an issue: for example, in infrastructure projects, bridge construction, or buildings on open land.
Drilled Piles
Drilled piles are the exact opposite of driven piles when it comes to installation: Instead of being driven forcefully into the ground, a hole is first drilled for each pile. Steel reinforcement is then placed inside this cavity, after which the entire structure is filled with concrete. This offers several advantages: it generates virtually no vibrations, the method is significantly quieter, and it allows for very precise work. This makes them ideal for residential areas, inner-city locations, or construction sites with limited space. Drilled piles are also extremely adaptable. Even in the presence of high groundwater levels, uneven soil conditions, or confined spaces, they deliver reliable results.
Micropiles
When conventional machinery is too large or the soil is particularly challenging, micropiles come into play. These slender steel tubes have a small diameter and are driven into the ground under high pressure. However, due to their small size, they cannot bear as much load. This makes them the ideal choice for renovations, building reinforcements, or additions. Micropiles also demonstrate their strengths in existing structures where foundations need to be retrofitted. An additional advantage: They can be precisely adapted to the specific soil structure using modern grouting techniques.
Displacement piles
This type of pile is used when the goal is to remove as little material as possible from the ground during installation. Instead of drilling, the soil is displaced laterally without causing vibrations—hence the name. This has two advantages: First, the soil around the pile is compacted, which provides additional stability. Second, it eliminates the need to haul away excavated material. Displacement piles work particularly well in cohesive soils, in coastal regions with soft subsoil, or for structures that need to be completed quickly. They are frequently used in conjunction with full- or partial-displacement piles, a method that efficiently combines drilling and displacement. In the Full-displacement method only a small portion of the soil is excavated. This requires larger machines with a great deal of power. In contrast, with the partial-displacement auger pile , smaller machines are used for drilling because less soil is displaced and thus brought to the surface.
Screw Piles
Screw piles function similarly to a large metal screw: They are mechanically screwed into the ground, without the need for concrete or extensive excavation work. The major advantage is speed: screw piles can bear a load immediately after installation and are particularly popular for small construction projects, such as garages, decks, carports, or solar systems. They are also in demand for temporary structures because they can be easily removed. Important to know: They are not suitable for larger or particularly heavy structures. In such cases, screw piles reach their load-bearing limits.
Pile Foundations in Practice: 3 Application Scenarios
Not all pile foundations are the same: Requirements vary significantly depending on where and what is being built. A heavy industrial building places entirely different demands on the foundation than a single-family home or a construction project on the coast. That is precisely why there are different types of piles that can be specifically selected based on the soil, load, and site conditions. The following examples illustrate which pile foundations have proven particularly effective for which construction projects and what matters most in practice.
1. Industrial and Commercial Buildings
Industrial and commercial buildings rarely involve small loads. Whether it’s a manufacturing facility, a logistics center, or an office building, these structures are subject to enormous loads that must be reliably transferred to the ground. At the same time, construction often needs to be carried out quickly, precisely, and cost-effectively. No wonder, then, that pile foundations are used particularly frequently in such projects.
The biggest difference between industrial and commercial buildings and a residential building lies in the load distribution. Machinery, stored goods, vehicles, and load-bearing steel structures not only add an enormous amount of weight but also create localized loads that a foundation must precisely accommodate. Particularly in the case of large spans or heavy production equipment, there must be no settlement later on; otherwise, there is a risk of cracks or deformations in the building, which, in the worst case, could bring ongoing operations to a standstill.
For industrial buildings, driven piles or so-called displacement piles are used. These types offer particularly high load-bearing capacity, can often be installed quickly, and require little preparatory work. They are driven directly into the ground using specialized equipment—which speeds up the process but also causes vibrations.
When vibrations are a problem—for example, due to sensitive neighboring structures or for environmental reasons—many builders opt for displacement piles instead. These are driven into the ground using a rotating motion and simultaneously compact the soil without removing any material. This makes them ideal for cohesive soils of varying quality.
2. Housing Construction: Single-Family and Multi-Family Homes
In residential construction, too, choosing the right type of foundation is crucial, especially when the subsoil of the lot appears challenging at first glance. Whether it’s a single-family home on the outskirts of town or a multi-family building in the city: if the building site is soft, damp, or uneven, a pile foundation may not only be the better option, but sometimes the only practical foundation method.
A common reason for using piles is difficult soil conditions—that is, soil that isn’t stable enough at the surface. This applies, for example, to properties with peat, clay, backfilled soil, or varying soil conditions. This is not uncommon, especially in new development areas or near bodies of water.
However, certain construction decisions also make pile foundations necessary: for example, when a basement is planned, when additional loads result from adding stories, or when closely adjacent buildings impose special requirements regarding settlement stability.
To ensure that no one is disturbed during construction—neither the neighbors nor the structure itself—three main types of piles are used in residential construction: drilled piles, displacement screw piles, and micropiles. All three can be installed without vibrations and using relatively small equipment. In addition, these drilling methods are quieter than the ones mentioned above. This makes them ideal for built-up residential areas where traditional pile driving methods would cause too much noise or vibration. Or where there is simply a small gap between buildings, since the equipment for displacement screw piles and micropiles is significantly smaller.
Drilled piles are particularly suitable when soil conditions are challenging or when working with a high water table. Micropiles, on the other hand, are used when space is very limited, such as in additions, on narrow lots, or in existing structures. For displacement screw piles, there are smaller machines that bridge the gap between those used for micropiles and bored piles—for example, those from Thade Gerdes.
3. Construction in Coastal Regions
In coastal regions or near rivers and lakes, the subsoil is often far from ideal for building a house. Here, soft soil layers such as peat, silt, fine sand, or clay alternate in an irregular pattern. These soils cannot evenly support the loads of a building near the surface, which can lead to settlement, cracks in the masonry, or an unstable foundation over time.
A conventional shallow foundation is usually insufficient under such conditions. Instead, a pile foundation is required to transfer the structure’s weight directly to deeper, load-bearing layers. Only then does the soil provide the necessary bearing capacity to support buildings safely and permanently. This is particularly relevant in regions with high groundwater levels: If water seeps in during excavation or softens the building soil, construction becomes a technical challenge. Piles, however, circumvent this problem because they do not rely on a broad foundation near the surface.
In practice, two types of pile systems are primarily used in such situations. Displacement piles are a common choice because, during installation, they push the soil to the side rather than removing it. This further compacts the surrounding soil, which increases the stability of the foundation. This is a clear advantage in soft or cohesive soils. If the subsoil is somewhat more stable, driven piles are also used. They can be installed quickly and are particularly suitable for projects with high loads, such as massive residential buildings or commercial structures near the coast.
Typical construction projects in which these methods are used include vacation homes near the beach, residential buildings in marshlands, waterfront developments with high soil moisture content, and technical structures such as pumping stations, dock facilities, or warehouses near ports. Wherever the subsoil does not provide reliable support, the right type of pile foundation ensures that the building remains stable and safe over the long term.
5 Special Cases
Not every construction project starts from scratch. Often, the goal is to expand, renovate, or structurally modify existing buildings. It is precisely in these cases that special solutions for pile foundations come into play—especially when the existing subsoil needs to be retroactively stabilized or additional loads must be supported. Special pile systems and installation methods are also required in bridge construction, for historic buildings, or in situations where the structure is in direct contact with groundwater.
1. Renovations of Existing Buildings
For older buildings with settlement cracks, unstable foundations, or inadequate load-bearing capacity, retrofitting with pile foundations may be the only practical solution. In such cases, micropiles are frequently used in such cases. They can be installed using compact equipment, even in areas with limited access or within built-up urban areas. Injection methods are used to further stabilize the surrounding soil. This not only secures the existing structure but also significantly extends the building’s service life.
2. Additions
Anyone who wants to add a story to an existing building or remodel it often introduces additional structural loads, whether through a new attic, more living space, or a change in use. To prevent the existing foundation from being overloaded, pile systems are used to specifically transfer the new forces to deeper layers. Here, too, micropiles are a proven solution, as they can be precisely planned and installed in a targeted manner without having to excavate the entire building.
3. Historic Buildings
Extreme caution is required when dealing with historic buildings. Interventions in the building’s structure are often permitted only to a very limited extent. At the same time, settlement must be halted or historic foundations stabilized. Much can be achieved here with pile foundation systems that are installed at specific points and without causing significant vibration: The building structure remains intact, stability is improved, and the building fabric is protected. For this purpose, a micropile or a partial-displacement screw pile are typically used for this purpose.
4. Pile Foundations in Water Resources and Bridge Engineering
When pile foundations are used underwater—such as for jetties, shoreline reinforcement, or bridge piers—special requirements apply: In addition to load-bearing capacity, resistance to water flow, corrosion, and fluctuating water levels is also critical. The piles typically used are steel piles with special coatings or composite solutions that can withstand long-term loads. Construction is often carried out from the water using floating equipment or temporary work platforms.
5. Combining Different Pile Systems
In complex projects, a single type of pile is sometimes insufficient. In such cases, combined solutions are used, such as a combination of shallow foundations and piles, or different types of piles within a single structure, depending on the specific section. Such hybrid solutions allow for precise adaptation to varying soil conditions, different loads, and structural constraints—and ensure that the foundation bears the load evenly across all areas.
A typical example is a logistics center with an attached administrative wing: While the warehouse area is founded on driven piles to support high point loads, a shallow foundation is sufficient for the office wing, possibly supplemented by short bored piles in sections with soft soil.
How much does a pile foundation cost?
Average Prices by Type of Post and Square Meter
| Driven pile | approx. 80–150 € per meter |
| Bored pile | approx. 150–300 € per meter |
| Micropile | approx. 250–500 € per meter |
| Screw pile | approx. 80–120 € per meter |
| Displacement Pile | approx. 100–220 € per meter |
How to Choose the Right Pile Foundation for Your Construction Project
Choosing the right pile foundation isn’t a matter of gut feeling, but rather the result of sound technical planning. To ensure the foundation truly holds, several factors must be examined and weighed against one another. After all, not every type of pile is suitable for every construction project, and even small differences in the soil can have a major impact on load-bearing capacity. Below, we outline five criteria you should consider when selecting the right pile method for your construction project.
1. What are the conditions of the building site?
The first and most important step is the soil investigation. It reveals the composition of the subsoil, its load-bearing capacity, and whether water is a factor. Without this analysis, it is impossible to make a reliable decision regarding the foundation. It is also important to note that soil conditions can vary significantly even within a single property, particularly on filled-in or formerly agricultural land.
2. What burdens must be borne?
A simple carport places different demands on the foundation than a production facility or a multi-story residential building. Therefore, the structural loads be calculated precisely, including dead weight, live loads, and potential additional loads such as wind, snow, or mechanical systems. The higher and more concentrated the load, the greater the load-bearing capacity the pile system must have.
3. What are the conditions at the construction site?
Also, the location of the construction site influences the choice of pile type. In narrow backyards or densely built-up urban areas, large equipment often cannot be used. This is where partial-displacement screw piles or micropiles come into play. In open areas with easily accessible terrain, on the other hand, driven piles or displacement piles can also be used cost-effectively.
4. Are there any restrictions due to noise or vibration?
Especially in residential areas or where neighboring structures are sensitive, the issue of vibrations plays a major role. In situations where pile driving would cause excessive noise or vibration, low-vibration systems such as partial-displacement screw piles are the better choice.
5. Are there any special features in the inventory?
If the project is built on an existing foundation—for example, in the case of a addition, expansion, or renovation, it must be determined whether the existing foundation needs to be reinforced. Often, a shallow foundation is not sufficient to support new loads. In such cases, micropiles provide targeted support for specific areas without affecting the existing structure.
Conclusion: The Right Pile Foundation for Your Construction Project
If you want to build on solid ground, you need to know what lies beneath it. After all, not all soils are the same, and not every type of foundation works everywhere. A pile foundation, on the other hand, is often the safest and most cost-effective option when the soil lacks sufficient bearing capacity. Whether it’s a vacation home near the coast, a production facility with high point loads, an apartment building on loamy soil, or the renovation of an old building with cracks in the foundation: piles ensure that structures remain where they’re supposed to be without causing settlement problems later on.
The right type of pile for your construction project depends not only on the soil, but also on the load distribution, the construction process, and the conditions at the job site. A thorough soil investigation and knowledge of proper application are therefore crucial, as is a partner who understands the technical possibilities and regional specifics.
If you’re planning a construction project and aren’t sure which deep foundation method is right for your property, seek advice before you begin construction. Thade Gerdes, an experienced specialist firm, is your partner from planning to the installation of load-bearing pile foundations throughout northern Germany.
Frequently Asked Questions About Types of Pile Foundations
What is the difference between shallow foundations and pile foundations?
The main difference between a shallow foundation and a pile foundation lies in the depth and the bearing capacity of the soil. With a shallow foundation , the building is constructed directly on a load-bearing subsoil located close to the surface. This works well if the soil there is stable enough to evenly support the weight of the structure. However, if the soil is soft, saturated with moisture, or has an uneven composition, this method quickly reaches its limits. That is precisely when the pile foundation comes into play. It is a type of deep foundation and transfers the building’s loads through long, slender piles to deeper soil layersthat provide reliable support, even when the upper layers are unsuitable.
When is a pile foundation necessary?
Pile foundations are always necessary when the topsoil does not provide sufficient bearing capacity. This is often the case with clay, sand, peat, or silt—that is, soils that compress significantly under load or settle unevenly. Even when the water table is very high or the soil consists of varying layers, a shallow foundation cannot provide the necessary stability. In addition, there are construction projects with particularly high loads, such as multi-story residential buildings, bridges, or industrial facilities. In these cases, the forces must be specifically transferred to deeper, stable zones. Especially in coastal regions, pile foundations may be the only cost-effective method to prevent future damage caused by settlement.
What types of posts are there?
There isn’t just one type of pile foundation; rather, there are several variations that are selected based on the soil conditions, building type, and available space. Particularly common are Driven pilesthat are driven into the ground with great force. They offer high load-bearing capacity and can be installed quickly, but they also cause noise and vibrations. Drilled piles work entirely without driving: A borehole is drilled and then filled with concrete. This method is quieter and more precise, making it ideal for tight or sensitive construction sites. Micropiles are used when space is limited or the building is already in place. They can be installed using small equipment and are particularly well-suited for renovations. With displacement piles , the soil is not removed but displaced to the side, which provides additional stability to the ground. And then there are screw piles, which can be screwed into the ground like an oversized screw—without any concrete or heavy machinery. Last but not least, there are hybrid types such as displacement screw piles, which are often used on vacant lots or small plots for single-family homes, additions, small warehouses, or smaller industrial buildings. So there’s a suitable pile solution for every construction project.
How do I figure out which pile foundation is right for my construction project?
That depends on several factors and can only be determined with certainty through professional planning. The most important factor is the building site: A soil investigation shows how load-bearing the individual layers are, how deep the foundation must extend, and whether, for example, groundwater is a factor. Then there’s the building itself—that is, the loads it must bear, its size, and its intended use. The accessibility of the construction site also plays a role: In narrow courtyards or densely built-up urban areas, large equipment can hardly be used. And, of course, any noise or vibration limits must be taken into account, for example in residential areas or near historic buildings. An experienced specialist company like Thade Gerdes brings all these aspects together and designs the appropriate pile foundation for your project.
How much does a pile foundation cost?
The cost of a pile foundation depends heavily on the type of pile, the soil conditions, the pile length, and the structural requirements. As a general guide:
| Driven pile | approx. 80–150 € per meter |
| Drilled pile | approx. 150–300 € per meter |
| Micropile | approx. 250–500 €/meter |
| Displacement Pile | approx. 100–220 €/meter |
| Screw pile | approx. 80–120 € per meter |
A specialized company like Thade Gerdes will prepare a customized quote for your project following a site investigation.
What are the advantages of pile foundations compared to other methods?
Pile foundations offer several advantages, especially when the soil conditions are less than ideal. They work where shallow foundations have long since failed—for example, in soft or water-bearing soils—and can be precisely tailored to the building’s requirements. Pile foundations also distribute high loads evenly and safely, which is particularly crucial for large spans or concentrated loads. They are also space-efficient to construct, making them ideal for narrow lots or inner-city locations. Many methods can be implemented quickly, which shortens construction time, and the significantly reduces the risk of future settlement, cracks, or renovation costs. In short: A well-planned pile foundation always pays off in the long run.
Is a pile foundation a viable option even for smaller construction projects?
Yes, definitely. Even smaller projects such as garages, carports, garden sheds, or additions benefit from pile foundations, especially when the soil lacks sufficient bearing capacity or the site is difficult to access. In such cases, micropiles or screw piles are often used. They can be installed without heavy machinery, cause virtually no vibration, and can bear loads immediately after installation. Pile foundations are also a quick and safe solution for temporary structures, such as solar installations or trade show booths, because many systems can be removed without leaving any residue.
What is the process for planning and installing a pile foundation?
The process always begins with a site investigation. This is the only way to reliably determine how deep the load-bearing layers are and which type of pile is best suited. This is followed by the structural analysis: How many piles are needed? How large do they need to be? What loads must be supported? Based on this, a specialized contractor plans the construction process. Depending on the method, the pile is either driven, drilled, displaced, or screwed into place. Various machines are used for this purpose, selected based on the construction site and pile system. It is important to note that the installation must be carried out precisely and under strict control, as defects in the foundation often do not become apparent until years later. With an experienced partner such as Thade Gerdes Handles all planning and execution under one roof—from the first core sample to the last pile.
