As the client, you are the focus of our work. We develop tailor-made, efficient concepts for you and offer integrative planning in all phases of the construction project.

The superimposition of specialist skills over and above the actual architect’s services enables us to take important aspects from the entire field of construction into account from the very beginning of the planning process.

An architect as your contact accompanies you through your construction project with the full support and experience of the entire office team. In addition to the services of the new building, the complex planning area of ​​building in the existing building is an important focus of our work.

Structural and energetic refurbishments, fire protection upgrades as well as the interests of monument protection are carried out in the office community | bfl processed directly from a single source.

Arnaud Bauman

Dipl.-Ing. Architect (France), Energy Consultant


Since 2011
Co-founder of the office community | bfl

Since 2006
Partner of Des Contours Architectes, Martin Bahuaud, Paris, France

Since 2004
independent work

David Chipperfield Architects
Participation in the reconstruction of the Neues Museum, Berlin

Heinz Tesar, architect
Participation in the basic repair of the Bodemuseum, Berlin

Dietsch & Ranter Architects
Participation in the new building of the General Secretariat of the German Red Cross, Berlin

AHO + Partner
Cooperation in the Audi Center, Berlin

Michelle Lenne Haziza Architecte, Paris, Frankreich


Diplom, Architektenkammer Berlin

Geprüfter Planer für ökologisches Bauen
Zertifikat, Öko-Zentrum NRW

École d’Architecture Paris La Villette EAPLV, Frankreich

École Boulle Paris, Frankreich


Since 2013
Registered with the German Energy Agency DENA in the list of energy efficiency experts

Since 2009
Registered with the German Energy Agency DENA as Dipl.-Ing. Architect and energy consultant

Since 2005
Registered with the Berlin Chamber of Architects as Dipl.-Ing. Architect #11608



Partner search, planning and moderation of the German-French exchange of skills for the German-French Chamber of Industry and Commerce on the topic: energy-efficient renovation in Berlin.
During the three-day event, CONSTRUCTYS Ile de France and the association for building services technicians, roofers and heating fitters exchanged their analysis and practical experiences with 10 construction companies from the Paris – Ile de France region with their colleagues from Germany.

Recherche de partenaires et intervenants, organisation et animation dans le cadre d’un échange franco-allemand de compétences pour la Chambre Franco-Allemande de Commerce et d’Industrie sur le thème: la rénovation énergétique à Berlin.
Au cours des trois jours de rencontre, CONSTRUCTYS Ile de France et le Génie Climatique et de Couverture Plomberie avec 10 entreprises de la Région Paris – Ile de France ont échangé leur analyse et leurs expériences pratiques avec leurs collègues allemands.

Norbert Freitag

Dipl.-Ing. Architect, energy consultant


Since 2011
Co-founder of the office community | bfl

Since 2009
freelance architect
Planning office Freitag, Berlin

Cooperation in the construction of a day-care center in Berlin

Müller und Keller Architekten, Berlin
Participation in housing construction in Berlin, 157 new and existing housing units

Why Art Projects – Vicente Guallart Arquitectos, Barcelona
Collaboration in residential building with 280 residential units, Valencia

Tarrasó I Espinás Associats, Barcelona
Open space planning express train station Lleida, Catalonia

Collaboration in various architectural offices

Since 2001
Cooperation with Christian Werner, architectural models


Since 2012
Member of the Berlin Chamber of Architects
as a freelance architect
Membership number 13999,

energy consultant
Registered with the Berlin Chamber of Architects

Architecture diploma TU Braunschweig

Studium UP Valencia, Spanien

Apprenticeship as a furniture maker

Johannes Leyer

Dipl.-Ing. Architect, planner for preventive fire protection


Since 2011
Co-founder of the office community | bfl, Berlin

Since 2010
Freelance work for VALTEQ GmbH, Berlin
Building inventory, due diligence

2010 prize
open realization competition Archaeological Center Mainz

Since 2004

2001 – 2004
Free planning office Leyer, Berlin

1993 to 2008
Freelance work and internships at:

  • PEP Architects Pfeiffer, Ellermann and Preckel, Lüdinghausen and Berlin
  • Igel Architects, Munster
  • TEMA-Q Technology and Management for Quality GmbH, Meinersen
  • Architectural office Henze and Vahjen, Braunschweig
  • State Building Office, Brunswick
  • Heinz Leyer, architect, Munster


Since 2014
Expert for preventive fire protection
Registered with the Berlin Chamber of Architects

Since 2012
Planner for preventive fire protection
Registered with the Berlin Chamber of Architects

Since 2007
Guest member of the Brandenburg Chamber of Architects
Membership number A-0968-07-A,

Since 2004
Member of the Berlin Chamber of Architects
as a freelance architect
Membership number 11528,

Diploma in Architecture, Technical University of Braunschweig

1988 to 2001
Studied architecture and mechanical engineering
TU Braunschweig, HAB Weimar, Politecnico di Milano


Arnaud Bauman
Gresa Calliku
Norbert Freitag
Lothar Klee
Sándor Kotyrba
Duc Minh Le
Johannes Leyer
Karsten Llorens
Tuan Anh Nguyen
Hanieh Razavi
Elif Sena Sezek
Jil Volkmar
Gonca Yilmaz