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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,629 companies indexed · Last updated: today
DirectoryCrafts & TradesPlumbing & Building ServicesRheinfeldenJ. Willers Engineering AG
J. Willers Engineering AG Logo
Verified· 3 sourcesTrust Score
Summary

About the company

J. Willers Engineering AG is an engineering firm for high‑tech buildings and infrastructure. It provides planning and engineering services including building services engineering, cleanroom and laboratory systems for life‑sciences, data center and energy solutions, BIM/BIM2FM and cyber security.

AI-generated
Offering

Products & services

Industry:Plumbing & Building Services
✓ Offered7
Building Services
Planning and control of building services with all trades handled in-house, including heating, ventilation, air conditioning, sanitary, electrical, building automation and consulting.
General Planning
General planning for technologically demanding buildings, with overall responsibility, integrated coordination of all design disciplines as well as feasibility studies, overall technical management and technical architecture.
Digital Building
Digital building solutions for networked building systems, with IoT and cloud integration, digital twin, BIM management, OT concepts and cyber security for planning, construction and operation.
Consulting
Advisory services for clients and operators on energy and building technology, including project steering, quality assurance, client representation, energy concepts and operational optimization.
Laboratory Planning
Laboratory planning for research and analytical environments, with laboratory concepts, supply of media, safety concepts, building services planning, laboratory equipment and BIM models.
GMP Consulting, Qualification and Validation
GMP services for life sciences, from GMP compliance through qualification to validation of facilities, systems and processes.
Cleanroom Planning
Cleanroom planning with room concepts, space layout, building services, process integration, BIM models as well as overall site management and specialist site management.
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4.1/5

J. Willers Engineering AG

Trust & reputation

ranQ Trust Score of J. Willers Engineering AG: 4.1 out of 5.0

Trust Score4.1/ 5.0

High

x

Data basis 58% · As of October 2026

Without public customer reviews the score stays capped.

J. Willers Engineering AG has no value in the Reputation area of the ranQ Trust Score because no data is available. The area carries 42% of the weighting and drops out of the calculation for this profile; it does not lower the score, only the reported data basis.
x
CriterionValueWeight
  • Review quality: No data point — the criterion is taken out of the weighting and does not lower the score.—24%
  • Review volume: No data point — the criterion is taken out of the weighting and does not lower the score.—10%
  • Review recency: No data point — the criterion is taken out of the weighting and does not lower the score.—8%
J. Willers Engineering AG scores 89.3 out of 100 points in the Substance area of the ranQ Trust Score. This area carries 28% of the weighting.
x
CriterionValueWeight
  • Establishment: Years since founding or brand launch, logarithmic. The maximum is reached at 15 years.100.012%
  • Company size: The headcount band, researched by ranQ or stated by the company. It is scored in steps rather than by head count, because the data only provides bands.70.07%
J. Willers Engineering AG scores 85.0 out of 100 points in the Identity area of the ranQ Trust Score. This area carries 22% of the weighting.
x
CriterionValueWeight
  • Verification: Official register entry (commercial register with UID or professional-body record, 55 points), confirmed domain (20 points) and confirmed ranQ profile (up to 25 points, depending on completeness).85.022%
J. Willers Engineering AG scores 41.5 out of 100 points in the Visibility area of the ranQ Trust Score. This area carries 8% of the weighting.
x
CriterionValueWeight
  • Website authority: Ahrefs' Domain Rating measures, on a scale of 0 to 100, how strongly a website is linked from other websites. For Swiss SMEs the range up to 40 is typical; the maximum is reached at 35.82.94%
  • Media authority: Quality and number of editorial mentions, weighted by the importance of the source, plus the recency of the latest high-quality mention.0.04%
Qualifications+0.00

J. Willers Engineering AG reaches a ranQ Trust Score of 4.1 out of 5.0 — rated «High». No public customer reviews are available for this provider; the rating is based on the remaining criteria. The data basis is 58%, so the score is backed by part of the criteria. As of October 2026.

The Trust Score cannot be bought and is calculated from publicly verifiable data.

Press

Media

June 30, 2026Media
Grünes Licht für Dienstleistungszentrum
nfz.ch
April 30, 2026Media
Neues Dienstleistungsgebäude geplant
nfz.ch

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Location

Quellenstrasse 1
4310 Rheinfelden

At a glance

Legal form
Corporation
UID
CHE-106.443.193
Founded
1989 · 37 years
Last commercial register change
August 29, 2025
Employees
11 to 20
Legal form: Graded by liability and disclosure. The weight is kept small: a sole proprietorship is not a dubious company, it is just liable differently.
100.0
6%
  • Branch offices: Branch offices linked in the commercial register. Having none is normal and costs no points.70.03%
    • Full methodology

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