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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,194 companies indexed · Last updated: today
DirectoryBusiness & Technical ServicesTechnical Consulting & EngineeringAarauHEFTI. HESS. MARTIGNONI. 4U AG
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HEFTI. HESS. MARTIGNONI. 4U AG

Summary

About the company

HEFTI. HESS. MARTIGNONI. 4U AG is part of the HHM Group and provides services in overall building-technical planning (HLKSE+), HLKS and electrical engineering for building and infrastructure projects, including areas such as building automation, energy supply, photovoltaics, e-mobility, lighting, security/door engineering and fire protection.

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Products & services

Industry:Technical Consulting & Engineering
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HVACSE Engineering
Planning of heating, ventilation/air conditioning, cooling and sanitary systems as an integrated building-services solution, including feasibility studies, variant studies, concepts, expert reports and quality assurance.
Electrical Engineering
Planning of electrical infrastructure for buildings and infrastructure projects, including strategy, concept development, quality assurance, specialist construction supervision, operation and maintenance support.
Building Automation
Cross-trade building automation for security, communication, comfort and control, from system selection through quality assurance to technical coordination and acceptance.
Overall Coordination/BIM
Spatial and technical coordination with BIM, cloud collaboration and digital planning workflows, including coordination, model checking, visualisation and a paperless construction site.
Power Supply Engineering
Planning of electrical power supply for buildings and infrastructure, including transformer stations, main low-voltage distribution, emergency power, UPS, short-circuit and load-flow calculations, and safety concepts.
Fire Protection Planning
Fire protection concepts and consulting for new builds and refurbishments, including structural, technical and organisational fire protection, escape and intervention plans, and safety officer tasks.
Photovoltaic Planning
Planning of photovoltaic systems, including system design, tender documents, construction support, simulations, feasibility studies, self-consumption optimisation and storage sizing.
Infrastructure Planning
Planning for railway systems, tunnels, airports, data centres and power plants, including cable systems, operational and safety equipment, technical coordination and quality assurance.

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Location

Neumattstrasse 13
5000 Aarau
Opening hours
Mon
08:00 - 17:00
Tue
08:00 - 17:00
Wed
08:00 - 17:00
Thu
08:00 - 17:00
Fri
08:00 - 17:00
Sat
Closed
Sun
Closed

At a glance

Legal form
Corporation
UID
CHE-396.727.263
Founded
2017 · 9 years
Last commercial register change
August 11, 2026
Employees
11 to 20

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