Since 1973, private and commercial customers have trusted the structural calculations and other services of our family-owned company.

Over 20,000 projects have been processed in our office since its establishment. Structural calculations for single-family houses and industrial plants, schools and hotels, as well as for renovation of old buildings are produced. Furthermore, fire and noise protection concepts are developed and energy consulting is carried out and energy certificates are issued.

The employees of our company have a high level of qualification and are specialized in various fields. The team consists of civil engineers, draftsmen and the secretariat. Each of our employees is constantly oriented to the current state of the art. A number of additional qualifications were also acquired.


In addition to equipment for structural investigations, we are excellently prepared for all requirements with modern equipped PC workstations and a powerful network.

With these prerequisites, customers can be guaranteed competent support and smooth project execution, even for the most difficult tasks.


1973 Company founded by Hans-Peter Fröhling
1992 Partnership with Manfred Rathjen, Ingenieurbüro Fröhling & Partner
1993 Office move to the current business address Schulstr. 22, 21698 Harsefeld
1996 Fröhling & Rathjen GbR mbH
2008 Hans-Peter Fröhling resigns from the Management Board
2008 Christian Fröhling and Thorben Rathjen join as managing directors
2012 Fröhling & Rathjen GmbH & Co. KG
2013 40th anniversary
2013 Manfred Rathjen resigns from the management board