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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,887 companies indexed · Last updated: today
DirectoryCrafts & TradesPlumbing & Building ServicesHerrlibergKoster AG Gebäudetechnik, Zweigniederlassung Herrliberg
Koster AG Gebäudetechnik, Zweigniederlassung Herrliberg Logo
Verified· 3 sourcesTrust Score
Summary

About the company

Koster AG Gebäudetechnik, Zweigniederlassung Herrliberg designs, installs and services heating, ventilation, air‑conditioning and sanitary systems, and provides building automation (MSRL), energy optimisation and control‑cabinet production.

AI-generated
Offering

Products & services

Industry:Plumbing & Building Services
✓ Offered9
Building services for large facilities
Building services for large facilities including heating, ventilation, air conditioning, MSRL/controls and electrical systems, and sanitary systems; from consulting and planning to installation, maintenance, upkeep and fault rectification.
24-hour service
24-hour on-call standby service for faults in heating, ventilation and sanitary systems, as well as water damage; quick help around the clock, including at night and on weekends.
Building services for small facilities
Building services for small facilities including heating, ventilation, air conditioning, electrical systems and sanitary systems; new builds, conversions, modernisation, maintenance and repairs from a single source.
Renewable energy
Planning and installation of heat pumps, photovoltaic systems and systems for extracting geothermal or solar energy, including an energy concept.
Building automation (MSRL)
Building automation for conversions, including consulting, planning and execution of MSRL projects, control concepts, commissioning and fine-tuning, as well as remote maintenance and remote control.
Sanitary systems
Sanitary installations for single-family houses, villas, residential developments, commercial and industrial buildings; consulting, planning, implementation, repairs and emergency service.
Conversion
Planning and installation of conversions for heating, ventilation, air conditioning, electrical and sanitary systems, including replacement of existing systems.
Modernisation
Modernisation of heat pumps, heating systems, underfloor heating, district heating substations, as well as ventilation, air conditioning, electrical and sanitary systems.
Repairs
Maintenance and repairs for heating, ventilation, air conditioning and sanitary systems, including flushing of underfloor heating and preventive upkeep.
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4.0/5

Koster AG Gebäudetechnik, Zweigniederlassung Herrliberg

Trust & reputation

ranQ Trust Score of Koster AG Gebäudetechnik, Zweigniederlassung Herrliberg: 4.0 out of 5.0

Trust Score4.0/ 5.0

High

x

Data basis 96% · As of October 2026

Koster AG Gebäudetechnik, Zweigniederlassung Herrliberg scores 59.7 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.31.224%
  • 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.100.010%
  • 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.95.08%
Koster AG Gebäudetechnik, Zweigniederlassung Herrliberg scores 79.9 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.83.012%
  • 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%
Koster AG Gebäudetechnik, Zweigniederlassung Herrliberg scores 85.0 out of 100 points in the Identity area of the ranQ Trust Score. This area carries 22% of the weighting.
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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%
Koster AG Gebäudetechnik, Zweigniederlassung Herrliberg scores 80.0 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 35.80.04%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Koster AG Gebäudetechnik, Zweigniederlassung Herrliberg reaches a ranQ Trust Score of 4.0 out of 5.0 — rated «High». The rating draws, among other things, on 3.5 out of 5 stars from 55 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
3.5
of 5

Aggregated from 55 reviews across all connected sources

Sources
GGoogle3.555
★TrustpilotSoon
PProvenExpertSoon

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

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Comparisons

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Location

Dorf 38
8704 Herrliberg
Opening hours
Mon
07:00 - 12:00, 13:00 - 16:30
Tue
07:00 - 12:00, 13:00 - 16:30
Wed
07:00 - 12:00, 13:00 - 16:30
Thu
07:00 - 12:00, 13:00 - 16:30
Fri
07:00 - 12:00, 13:00 - 16:30
Sat
Closed
Sun
Closed

At a glance

Legal form
Branch
UID
CHE-390.484.197
Founded
2017 · 9 years
Last commercial register change
April 26, 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.76.06%
  • 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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