Energy consulting in
Sion

CSD Ingénieurs SA

Since 1992 · 101–500 empl.

CSD Ingénieurs SA is an engineering company providing services in environmental engineering, geology, water, energy and construction. Its work includes contaminated-site remediation, transport and infrastructure projects, and planning for buildings and open spaces.

AASK Sàrl

Since 2010 · 1–10 empl.

AASK Sàrl is an architectural practice working on new buildings, conversions, renovations and restorations, including villas, apartment buildings and chalets. Its services also include energy-related advice, feasibility studies, property analyses and valuations, and advice on property acquisitions.

Physeos SA

Since 2011 · 1–10 empl.

Physeos SA provides consulting and expertise in energy efficiency and building physics for buildings and industrial processes. Its activities include energy concepts, building assessments, subsidy applications, the bSol® simulation tool, training, and research projects on energy production and use.

Enerconseil Sion SA

Since 2005 · 11–20 empl.·5.0(3)

Enerconseil Sion SA provides consulting on energy efficiency and building services engineering. Its work includes energy concepts, building physics, acoustics, renewable energy, and the optimisation and refurbishment of buildings and technical systems.

Workswell Sàrl

Since 2019 · 1–10 empl.

Workswell Sàrl develops energy measurement and monitoring solutions for buildings. Its services include data acquisition, energy monitoring, energy audits and consulting, protocol audits, open products, and custom software and electronics development.

VHTechnic Sàrl

Since 2011 · 1–10 empl.·5.0(3)

VHTechnic Sàrl is an engineering consultancy for plumbing, heating, ventilation, air conditioning and energy systems. Its services include technical studies, tendering and execution plans, project supervision, energy assessments and studies for Minergie-certified buildings.

Produbati Sàrl

Since 2021 · 21–50 empl.·5.0(2)

Produbati Sàrl provides building pollutant assessments, including inspections for asbestos, lead, PCBs and PAHs. Its services also include sampling, monitoring of remediation work, radon measurements, building energy certificates and advice on energy renovations.

OIKEN SA

Since 2019 · 101–500 empl.·2.8(71)

OIKEN SA supplies electricity to households, businesses and municipalities and operates and develops energy distribution networks. Its services also include photovoltaic, heating and electric mobility solutions, energy advice, efficiency assessments and multimedia services.

Gil Sequeira - Aetherys Etudes CVCS

Since 2025 · 1–10 empl.

Gil Sequeira - Aetherys Etudes CVCS is an independent building-services engineering and consultancy practice. It prepares studies and designs heating, ventilation, air-conditioning and plumbing systems, as well as building-physics and energy concepts. Its services also include construction supervision and project support.

MGAD Sàrl

Since 2016 · 1–10 empl.

MGAD Sàrl provides architectural and interior design services for new builds and renovations. Its services also include building energy assessments under the CECB and CECB+ schemes, as well as fire safety concepts and support with the relevant authorities.

Bucheli Energy Solutions

Since 2025 · 1–10 empl.

Bucheli Energy Solutions provides engineering and consulting services for electric mobility and the integration of renewable energy. Its services include assessing energy needs, planning charging infrastructure, and developing energy concepts involving, among other things, photovoltaics, batteries, heat pumps, and self-consumption solutions.

Sinnoren SA

Since 2019 · 1–10 empl.