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Who we are

WSP is one of the world's leading engineering and consultancy firms.

Our Switzerland office is one of 500 WSP offices across the globe. With a presence in over 40 countries, we have around 38,000 people working on various 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.



Our expertise and focus in Switzerland

Our main services:


Building technology - heating, cooling, ventilation, air-conditioning, sanitary, building automation (BMS) and MEP coordination


Energy optimization, energy concepts, technical and environmental due dilligence.

Quality management.

Project Management:

We are able to manage multidisciplinary projects.

Our focus market segments:

Property and buildings

Our main experience is with offices, banks & insurance companies, retail, healthcare, retirement homes, hotels, schools and data centers.

Our clients include J.P.Morgan, HSBC, Hermès, Migros, Luzerner Kantonsspital, Hirsladen Klinik, UBS, SBB, Zurich Insurance, Hotel Palace Bürgenstock, FIFA, various global investment banks.


Our main experience is with projects in Aerospace & Defense and Automotive. We are also able to support clients in segments - food and beverage, pharmaceutical and chemical

Our clients include RUAG, Pilatus, AMAG, BAER Käserei, 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.

Example reference: Gotthard Base Tunnel: We provided the entire Overhead Catenary Systems (Traction Power Supply) design.

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.

If useful for the project - we are 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.