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Who we are

WSP is one of the world's leading professional services firms providing technical consultancy to the built and natural environment.

Our Switzerland office is one of 500 WSP offices across the globe. With a presence in 40 countries, we have 36,000 people working on our iconic projects.

On May 31, 2017 - WSP acquired Wirthensohn AG

Wirthensohn, based in Luzern, is an engineering office with more than 60 years of experience in Switzerland.

Wirthensohn is recognized for its expertise in building technology (heating, cooling, ventilation, air-conditioning ), building automation (BMS), MEP coordination, energy optimization and efficiency consultancy, as well as  technical and environmental due diligence. The firm has been focusing on Property and Buildings (hospitals, hotels, retail, offices, schools, datacentres, etc.) and Industry (for example aerospace and defense).


Together we are stronger and look forward to supporting our clients in meeting their business objectives.

Specialist services
  • Engineering

  • Construction management

  • Project management

  • Environmental consultancy

  • Technical due diligence

We’re able to draw on the best expertise from around the world to provide the right mix of:


Engineering and consultancy manpower. We're able to draw on our experts from around the world. 


From smart buildings and vertical transportation to façade engineering and environmental consultancy.


A local presence in Switzerland coupled with global reach.

Our specialist expertise

In Switzerland, our expertise and experience is focused in the following areas:

Property and buildings

We deliver property and buildings projects for offices, retail, healthcare and mission critical facilities. Our clients include J.P.Morgan, HSBC, Hermès, Goldman Sachs, FIFA and a global investment bank.


We deliver industrial projects in food and beverage, pharmaceutical and chemical sectors. Our clients include Ionbond and Syngenta.

Transport and infrastructure

Working together with our colleagues at WSP Infrastructure Engineering GmbH in Germany, as an integrated part of the WSP group, we deliver services in rail and Light Rail Transit.

Gotthard Base Tunnel

We provided the entire Overhead Catenary Systems (Traction Power Supply) design.

High Speed: Karlsruhe-Basel

We provided electrical and mechanical engineering services for subsections in Switzerland from signaling to heating ventilation and underground cables.


Together with WSP Infrastructure Engineering GmbH, we develop and maintain railway signaling design for the software company. 

Power and energy

We have a distinguished track record in quality control services, and provide an impressive suite of technical expertise and support to clients around the world.

OKG - Oskarshamn Nuclear Plants, Sweden

We provided works inspection services across Europe, witnessing major tests during the manufacture of steam turbines and generators. We carried out factory acceptance tests of the assembled generators and provided technical advice.

Dominion Resources, Virginia USA

We provided support to various new build Combined Cycle Gas Turbine projects. With a global supply chain, our team was able to deliver the projects within the specified quality requirements.