Ground investigation: The first step towards a safe construction project

Soil investigation Costs Types and procedures

Introduction to ground investigation: definitions and necessity

The ground investigation is a critical step before the start of any construction project. It serves to precisely analyse the condition and properties of the subsoil. This investigation is essential to ensure that the ground can bear the load of the planned structure and to avoid subsequent structural damage such as subsidence, cracks or moisture problems.

Why a ground investigation is essential

Every building owner should not underestimate the importance of carefully analysing the subsoil. Without this basic analysis, construction projects can be exposed to considerable risks. The investigation helps to recognise unforeseeable problems with the ground, such as non-load-bearing layers or the presence of groundwater, at an early stage. This information is crucial for planning a safe and stable foundation.

What is a ground investigation?

A subsoil investigation is defined by various methods and procedures to determine the physical properties of the soil. These include soil mechanical tests, the analysis of soil samples and geophysical investigations. The aim is to obtain a detailed picture of the nature of the subsoil, including information on bearing capacity, water content, water permeability and much more. This data is essential in order to put the construction project on a solid footing.

An essential aspect of the subsoil investigation is the resulting Soil expertise. This report summarises all the results and provides recommendations for the construction of the foundation. Following these recommendations guarantees that the building project is built on a secure foundation. In addition, the subsoil investigation according to DIN 4020 for certain construction projects is not only recommended, but also required by law.

Soil investigation costs: influencing factors and estimates

The cost of a ground investigation can vary considerably and depends on several factors. It is important to understand that this investment is crucial for the planning security and long-term cost efficiency of a construction project.

How the costs are made up

The total cost of a ground investigation is made up of various components, including the type and depth of the boreholes, the number of samples taken, laboratory analyses and the preparation of the final soil report. Depending on the nature of the subsoil and the specific requirements of the construction project, different investigation methods can be used, which also influence the costs.

Cost estimate for your project

On average, the cost of a ground investigation is between 0.1% and 0.5% of the total construction costs. For an average detached house, the costs can therefore amount to several thousand euros. However, it is important to emphasise that these costs should be seen as an investment in the safety and longevity of the building compared to the potential additional costs of problems with the subsoil that could occur without such an investigation.

Investing in a ground investigation may initially appear to be an additional cost item, but it is essential in order to build safely and economically in the long term. A sound knowledge of the subsoil enables precise planning of the foundation and minimises the risk of costly surprises during the construction phase.

Different types of ground investigation and their applications

The choice of the appropriate method for a ground investigation depends on the specific requirements of the project, the nature of the ground and the financial framework conditions. The methods can be roughly divided into direct and indirect methods, each of which has its own advantages and areas of application.

Direct methods of subsoil investigation

Direct methods include boreholes, trenches and core samples. These allow direct observation and analysis of the soil layers and are particularly informative. Boreholes that reach to a certain depth provide precise information about the soil structure, water levels and geological conditions. However, they are also more time-consuming and costly compared to other methods.

Indirect methods and their significance

Indirect methods, such as geophysical investigations, utilise physical measurement methods to draw conclusions about the composition of the ground. These include seismic surveys, in which the strength and composition of the subsoil can be determined by measuring sound waves. These methods are faster and less invasive, but often provide less detailed insight than direct methods.

Both approaches are justified and are often used in combination to obtain a comprehensive picture of the subsoil. The appropriate method should always be selected in consultation with a geotechnical expert, who will make a recommendation based on the specific project requirements and the preliminary budget.

Choosing the right method

It is important that clients seek advice from a geotechnical engineer or surveyor in order to choose the most appropriate investigation method for their project. This not only ensures the reliability of the investigation results, but also helps to avoid unnecessary costs.

Choosing the right company for your ground investigation

When planning a construction project, the selection of a competent company to carry out the ground investigation is of crucial importance. Careful selection ensures that the investigation is carried out to the highest standards and delivers reliable results.

Criteria for selecting a competent company

Important aspects to consider when making a selection are the experience of the company, references from previous projects, the qualifications of the team and the technology used. It is also advisable to choose companies that are located close to the construction project, as they are familiar with the local geological conditions and can be on site more quickly.

Soil investigation companies: What you should look out for

In addition to the criteria already mentioned, building owners should ensure that the chosen company complies with all relevant standards and regulations, in particular DIN 4020. This ensures that the report contains all the necessary information and is recognised by the authorities and other parties involved in the construction project.

- Earth baron analyses, moves & disposes

Where can I find a reliable company for my ground investigation?

Erdbaron is your reliable partner for this crucial step in the construction process. With comprehensive services from the initial consultation to the detailed preparation of your subsoil report, we ensure a solid foundation for your construction project. Our team of experienced geotechnical engineers utilise the latest technologies to guarantee precise results that contribute to the safety and efficiency of your project. Our subsoil survey provides you with in-depth insights into the geotechnical properties of the soil on your building site. With Erdbaron, you choose a partner who analyses, moves and disposes - for a sound basis on which you can safely build your construction project.

Carrying out the ground investigation: steps and processes

Carrying out a ground investigation follows a structured procedure that ensures that all relevant information about the condition of the subsoil is recorded. This process is crucial for the planning and realisation of a successful construction project.

Preparation and planning

The first step in a ground investigation begins with careful planning. This includes selecting the investigation methods based on the specific requirements of the project and the preliminary information about the site. At this stage, it is important to consider all existing data and previous investigations to avoid duplication and maximise efficiency.

Realisation and evaluation

The planning phase is followed by the actual field work. Depending on the chosen method, boreholes are drilled, samples are taken or geophysical measurements are carried out. The collected data and samples are then analysed in order to gain a detailed understanding of the ground and geological conditions. This information is of great importance for the development of a safe and customised foundation design.

The evaluation of the results leads to the creation of a Soil expertise. This document contains detailed information on the load-bearing capacity of the soil, water conditions, possible contamination and recommendations for the foundation design. It serves as a basis for further planning and construction decisions.

Working with an experienced team of geotechnical engineers and specialists is a key factor in the quality and reliability of the ground investigation. It is crucial to choose a company that not only has the necessary expertise, but also uses modern technologies and methods to deliver precise and reliable results.

Carrying out a ground investigation is a complex process that requires specific knowledge and experience. It is a crucial step that should not be underestimated, as it has a significant impact on the safety and stability of the entire construction project.

Frequently asked questions

Who carries out a ground investigation?

The selection of a competent company is crucial when carrying out a ground investigation. Important criteria are the experience, references, qualifications of the team and the technology used.

Erdbaron is your trusted partner in this process, with a team of experienced geotechnical engineers who utilise the latest technologies to ensure accurate results that contribute to the safety and efficiency of your project. You can find more information on our website.

What does a ground investigation cost?

On average, the costs are between 0.1% and 0.5% of the total construction costs. The costs vary and depend on the type and depth of the boreholes, the number of samples, laboratory analyses and the preparation of the soil report.

What are the different types of ground investigation?

Subsoil investigations can be divided into direct and indirect methods. Direct methods include boreholes, trenches and core samples, which enable direct observation and analysis of the soil layers. Indirect methods, such as geophysical investigations, utilise physical measurement methods to draw conclusions about the soil properties.

Why a subsoil survey?

A subsoil survey is essential to ensure that the ground can bear the load of the planned building and to avoid subsequent structural damage such as subsidence, cracks or moisture problems.

How is a subsoil survey carried out?

A ground investigation begins with the planning and selection of the investigation methods, followed by the field work, during which, depending on the method, boreholes are drilled, samples are taken or measurements are carried out. The collected data and samples are analysed to gain a detailed understanding of the soil conditions. The results lead to the preparation of a subsoil report, which contains detailed information on the load-bearing capacity of the soil and recommendations for the foundation design.

Is it possible to deduct the costs of a soil investigation from tax?

Yes, in many cases the cost of a ground investigation can be claimed against tax as a necessary expense as part of a building project, especially for commercial projects. For private building projects, it depends on the individual circumstances and tax legislation.

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