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

About the company

Gebr. Estermann AG provides building services engineering for heating, ventilation, sanitary systems and solar technology, covering planning, installation and maintenance. Offerings include bathroom renovation and 3D planning, service and maintenance, mobile heating units and Quooker faucet installation.

AI-generated
Offering

Products & services

Industry:Plumbing & Building Services
✓ Offered5
Heating and thermal systems
Heating refurbishments and new heating systems, including oil and gas heating, pellet heating, ground heat exchangers and air-to-water heat pumps; planning and implementation for residential and commercial premises.
Ventilation systems and indoor climate
Installation and servicing of ventilation systems for residential and commercial premises, including advice, detailed planning, assembly and complete maintenance service.
Plumbing installations and bathroom renovation
Plumbing installations and bathroom renovation with planning, cost estimates, implementation and maintenance; new builds, bathroom refurbishments, 3D bathroom planning, water treatment and filtration systems.
Boiler service and boiler maintenance
Inspection of existing boiler systems, new installations, boiler maintenance and replacement as well as boiler descaling; also heat-pump boilers as a replacement solution.
Quooker distribution and installation
Quooker faucet distribution partner, including professional installation, on-site introduction and advice on product selection.
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4.3/5

Gebr. Estermann AG

Trust & reputation

ranQ Trust Score of Gebr. Estermann AG: 4.3 out of 5.0

Trust Score4.3/ 5.0

Very high

x

Data basis 96% · As of October 2026

Gebr. Estermann AG scores 73.8 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.75.924%
  • 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.65.210%
  • 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.78.08%
Gebr. Estermann AG scores 86.1 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.92.512%
  • 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%
Gebr. Estermann 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%
Gebr. Estermann AG scores 42.9 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 35.42.94%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Gebr. Estermann AG reaches a ranQ Trust Score of 4.3 out of 5.0 — rated «Very high». The rating draws, among other things, on 4.7 out of 5 stars from 12 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
4.7
of 5

Aggregated from 12 reviews across all connected sources

Sources
GGoogle4.712
★TrustpilotSoon
PProvenExpertSoon

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

Knowledge

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Comparisons

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Location

Grossweid 2
6026 Rain
Opening hours
Mon
07:00 - 12:00, 13:00 - 17:00
Tue
07:00 - 12:00, 13:00 - 17:00
Wed
07:00 - 12:00, 13:00 - 17:00
Thu
07:00 - 12:00, 13:00 - 17:00
Fri
07:00 - 12:00, 13:00 - 17:00
Sat
Closed
Sun
Closed

At a glance

Legal form
Corporation
UID
CHE-430.640.815
Founded
2014 · 12 years
Last commercial register change
August 17, 2023
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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