Dr Gerolf Sonntag

Specialist lawyer for construction law and architects’ law


  • Plant engineering law
  • Law of architects and engineers
  • Construction contracts
  • Commercial lease law
  • Real estate law
  • Legal management for large-scale projects JurProM®
  • Project development and project management law

Dr Sonntag advises principals and contractors on all questions regarding the drafting and management of construction and plant engineering contracts. A key practice area is advice during the project implementation phase. A further key area is litigious disputes before courts or arbitral tribunals.


What others say

Recommended lawyer for construction law  – Legal 500 Germany 2020


One of the most frequently recommended lawyers for construction law – Handelsblatt/Best Lawyers® "Germany's Best Lawyers 2020"


Recent work

  • Imtech Deutschland GmbH & Co. KG: large scale proceedings concerning technical building services
  • International plant engineering company
  • Power plant construction 
  • Project developers, e.g. Frankonia Eurobau AG
  • Medium-sized construction companies


Further qualifications and memberships

  • Lecturer on contract management at TU Dortmund University
  • Speaker at numerous seminars on construction law and plant engineering law
  • Speaker at numerous congresses and seminar events

Publications (in German) 


Events (in German)

Curriculum vitae 

  • Studied law at the University of Konstanz and the Université d‘Auvergne, Clermont-Ferrand (France), 1994 to 2000
  • PhD on international corporate law, 2000 to 2004
  • Legal clerkship at the Higher Regional Court of Düsseldorf, 2001 to 2003
  • Lawyer (Rechtsanwalt) at Kapellmann since 2004