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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,701 companies indexed · Last updated: today
DirectoryCrafts & TradesPlumbing & Building ServicesChurWilli Holding AG
Willi Holding AG Logo
Verified· 3 sourcesTrust Score
Summary

About the company

Willi Gebäudetechnik AG is a major company in the field of building technology, specializing in the planning, execution, and maintenance of heating, cooling, ventilation, and sanitary systems. The core activities include the installation, maintenance, and repair of: heating systems (gas heating, oil heating, bivalent heating), ventilation and air conditioning systems, and sanitary systems (bathroom renovations, boiler maintenance). The company also offers services such as customer service, boiler maintenance, and bathroom calculators.

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Products & services

Industry:Plumbing & Building Services
✓ Offered5
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4.0/5

Willi Holding AG

Heating and cooling technology
Heating renovations, new installations, solar thermal systems, wood heating systems, heat pumps, heat-pump boilers, district heating connections, bivalent heating, gas and oil heating, and refrigeration systems.
Ventilation and air-conditioning technology
Comfort ventilation, kitchen and bathroom extraction, heat recovery systems, catering installations, plus planning, installation, repairs, maintenance, and 24-hour on-call service.
Plumbing and sanitary engineering
Bathroom conversions, kitchen conversions, swimming pools, wellness facilities, water and wastewater installations, gas installations, compressed-air systems, leak warning systems, water treatment, and boiler services.
Building services planning
Energy consulting, energy concepts, energy accounting, planning of building services systems, electrical systems and building automation, plus district heating, water supply, wastewater disposal, and gas supply.
HVAC and electrical service
24-hour on-call service, repairs and maintenance, service contracts and maintenance for HVAC and electrical systems; boiler servicing, lighting upgrades, electrical renovations, and charging stations.
Trust & reputation

ranQ Trust Score of Willi Holding AG: 4.0 out of 5.0

Trust Score4.0/ 5.0

High

x

Data basis 96% · As of October 2026

Willi Holding AG scores 49.8 out of 100 points in the Reputation area of the ranQ Trust Score. This area carries 42% of the weighting.
x
CriterionValueWeight
  • Review quality: The average rating across all connected sources, smoothed against the industry mean. So 5.0 stars from three reviews do not outrank 4.7 from three hundred.68.224%
  • Review volume: The number of reviews across all sources. The scale is logarithmic: the first reviews count the most, and the maximum is reached at 50 reviews.17.610%
  • Review recency: The age of the most recent review. Two-year-old reviews deliberately sit in the middle, because that is normal for Swiss SMEs. Only after three years without a new voice does the value drop markedly.35.08%
Willi Holding AG scores 92.3 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.82.07%
Willi Holding 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%
Willi Holding AG scores 62.9 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 35.62.94%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Willi Holding AG reaches a ranQ Trust Score of 4.0 out of 5.0 — rated «High». The rating draws, among other things, on 5.0 out of 5 stars from 1 customer reviews. The data basis is 96%, 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.

Reviews

Aggregated rating

Aggregated rating
5
of 5

Aggregated from 1 reviews across all connected sources

Sources
GGoogle51
★TrustpilotSoon
PProvenExpertSoon

Further sources are added continuously and factored into the ranQ Rating.

Knowledge

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Location

Industriestrasse 17
7000 Chur
Opening hours
Mon
07:15 - 12:00, 13:00 - 17:30
Tue
07:15 - 12:00, 13:00 - 17:30
Wed
07:15 - 12:00, 13:00 - 17:30
Thu
07:15 - 12:00, 13:00 - 17:30
Fri
07:15 - 12:00
Sat
Closed
Sun
Closed

At a glance

Legal form
Corporation
UID
CHE-109.407.495
Founded
2001 · 25 years
Last commercial register change
September 2, 2024
Employees
21 to 50
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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