Josef Viethen
Certified Passive House Designer
Dipl.-Ing. Architekt
J + J Viethen Architekten
Lindenweg 10
41812 Erkelenz
Germany
Phone: 0049 2431 806040
info@viethen.de
http://www.viethen.de
Initial by Exam
Certificate valid from Jan. 22, 2015
Certificate valid until Jan. 22, 2020
Certificate valid until Jan. 22, 2020
The certificate only applies to this person.
Examined by IBN Passivhaus-Technik - Institut für Bauen und Nachhaltigkeit at Köln, Germany