A+W St. Gallen

When it comes to integral building services engineering planning, we are your contact in Eastern Switzerland. We are neutral and stand for innovative concepts, high quality planning and competent support during the implementation process right up to handover to the client. Our solutions are economically and ecologically convincing, and that over the entire life cycle.

As a consulting office we enjoy a good reputation throughout the whole of Switzerland as in the construction industry, integral planning, energy concepts, as well as building operation and maintenance concepts based on sustainability.

Amstein + Walthert St. Gallen AG, with its 44 employees, belongs to the Amstein + Walthert Group which is amongst the group of Swiss market leaders in the field of Engineering and Consulting.


Mandioni Nadir

Mandioni Nadir
Geschäftsleiter, Partner
A+W St.Gallen

Mannhart Martin

Mannhart Martin
Bereichsleiter HLK | Stv. Geschäftsleiter
A+W St.Gallen

Keller Hanspeter

Keller Hanspeter
Bereichsleiter Elektro | Gebäudeautomation
A+W St.Gallen

Schenk Christoph

Schenk Christoph
Bereichsleiter Sanitär
A+W St.Gallen


Amstein + Walthert St. Gallen AG
Fürstenlandstrasse 41
CH-9000 St. Gallen
+41 71 221 15 15


Legal form

Public limited company

Share capital

CHF 100,000, 100% owned by Amstein + Walthert Holding PLC

Facts and Figures

30 Employees

Electrical and HVAC engineers
Designers, technicians, construction specialists