The geotechnical subsoil expertise ... know what you are building on!

What you need to know: Foundation recommendation, groundwater level, infiltration capacity (for rainwater)

WITHOUT HIDDEN COSTS

Subsoil expertise

Standardised prices throughout Germany

Mechanical
Analysis

NET

840,32€

Package price

10% DISCOUNT

Declaration analysis

NET

1134,42€

Chemical analysis

NET

420,15€

Example: detached house
from 840,32€

Arrival and departure

No additional costs for travelling to and from the event

Construction site equipment

Installation of all equipment and machines for pile-driving core drillings

2x percussion coring

Pile-driving core soundings up to a depth of 6m

Contents of the subsoil expertise

Layer structure

Layer structure of the subsoil and categorisation of soil classes according to DIN 18300

Groundwater

Determination of the groundwater situation and, if applicable, the height of the groundwater table

Soil pressure

Specification of the subgrade reaction modulus, the permissible soil pressure and the base pressure that can be absorbed

Founding recommendation

Recommendation for foundation and foundation parameters

Photo documentation

Photo documentation: Photos of the property and drilling results

Arrival and departure

No additional costs for travelling to and from the event

Construction site equipment

Installation of all equipment and machines for pile-driving core drillings

2x percussion coring

Pile-driving core soundings up to a depth of 6m

Contents of the subsoil expertise

Layer structure

Layer structure of the subsoil and categorisation of soil classes according to DIN 18300

Groundwater

Determination of the groundwater situation and, if applicable, the height of the groundwater table

Soil pressure

Specification of the subgrade reaction modulus, the permissible soil pressure and the base pressure that can be absorbed

Founding recommendation

Recommendation for foundation and foundation parameters

Photo documentation

Photo documentation: Photos of the property and drilling results

Content of the declaration analysis

Sampling protocol

Sampling protocol based on LAGA PN98 with photo documentation

Laboratory report

Laboratory report with measured values of the individual parameters

Evaluation

Classification of waste based on limit value exceedance

Subsoil expertise - questions and answers

  • What is a subsoil expertise?

    A subsoil survey is a geotechnical investigation that serves to check the properties of the subsoil. The result is an evaluation of various parameters and characteristics of the soil. The results of the subsoil survey are used by the architect and structural engineer as a basis for planning the basement and the foundations of the building.

    Firstly, pile-driving core soundings are carried out on site. The layer structure of the soil can be determined on the basis of the pile-driving core sounding. The soil pressure is also determined. A photo documentation is created during the inspection of the pile-driving core probe. The subsoil expertise is then drawn up from all the information obtained on site.

    The mechanical properties of the soil are checked in a subsoil survey. The following is usually checked: 

    1. Percussion core probing
    2. Layer structure

    3. Soil type

    4. Groundwater level

    5. Soil pressure

    6. Infiltration capacity

    7. Photo documentation

    8. Expert opinion

    The typical building ground survey is often mistakenly referred to as a soil survey, although a building ground survey is a special sub-form of a soil survey.

     

  • What does a ground survey cost?

    The costs of a subsoil survey depend largely on the scope of the investigation. The scope of the investigation depends on the requirements of the building to be constructed.

    For a detached house with a basement and a floor area of less than 100m², the costs are between €1000 and €2000, depending on the provider.

    For a commercial building with a floor area of 600m², you can expect to pay between €2,500 and €3,500.

    There are dubious providers who advertise prices starting at €524. However, when the order is placed, a significantly higher price is quoted.

     

  • Is a ground survey mandatory?

    The preparation of a subsoil survey has been mandatory since 2008. This is regulated by the building regulations or the state building law of the respective federal state. The new regulation was ignored by construction companies for a long time after its introduction. The judgement by the Naumburg Higher Regional Court in 2014 dispelled the last doubts about the existence of an obligation. Since then, there have hardly been any new builds where the obligation to obtain a subsoil report has been ignored.

    (OLG Naumburg, judgement of 29.1.2014, ref. 12 U 149/13; retrieval no. 140781)

     

  • Who carries out ground surveys in the neighbourhood?

    In the vicinity of every construction project, there are engineering firms that prepare ground surveys. However, supra-regional providers are usually cheaper and quicker to carry out. Erdbaron, for example, offers subsoil surveys in Bavaria, Baden-Württemberg, Hesse, Rhineland-Palatinate and Saarland for as little as €840.32.

    A subsoil survey is usually carried out by a geologist or geotechnical engineer.

     

  • What is the right time for a ground survey?

    The ideal time for a ground survey is before you buy the property. This is the only way to ensure that the building site is suitable for constructing the planned building.

    If you already own a plot of land and do not have a subsoil report, you should have this available at the latest during the planning phase of the building.

    If you buy a plot of land and do not know the condition of the soil, you may have to pay dearly for it. If the subsoil is not suitable for the foundation of the planned building, expensive measures must be taken to create the appropriate subsoil.

    Examples of measures to improve the subsoil:

    - Pile foundation
    - Soil replacement
    - Soil stabilisation

     

  • What is the difference between a building site survey and a soil survey?

    A soil survey refers to all types of reports that deal with the properties of the soil. A subsoil report is a special type of soil report. It is designed to check the buildability of the soil.

    For example, if you want to build a house or a hall and want to dispose of excess soil, you need two soil surveys.

    1. A subsoil survey to ensure that the soil has the mechanical properties required for the foundation of the building.

    2. A waste declaration analysis to check the soil for geochemical contamination before disposal.