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

About the company

Estermann Rain AG is a building services company that designs, installs and services heating, ventilation, sanitary and solar systems. Its services include bathroom planning and renovations, water treatment, temporary mobile heating units and maintenance for residential and commercial clients.

AI-generated
Offering

Products & services

Industry:Plumbing & Building Services
✓ Offered7
Heating
Heating and heat supply systems for residential and commercial premises; oil and gas heating systems, pellet heating systems, borehole heat sources and air-to-water heat pumps, including planning and implementation.
Plumbing
Sanitary installations for new builds, bathroom upgrades and bathroom renovations; planning, installation, 3D bathroom planning, water treatment, filter systems, as well as maintenance and service.
Ventilation
Ventilation and indoor climate solutions for residential and commercial premises; consultation, detailed planning, execution and installation, as well as complete maintenance service.
Boiler service
Inspection of existing boilers, new installations, boiler maintenance and replacement, as well as boiler descaling; in addition, heat pump boilers and comprehensive service.
Bathroom renovation
Bathroom renovation and bathroom planning with suitable sanitary fittings; cost estimates, implementation and maintenance for complete bathrooms from a single source.
Quooker sales and installation
Quooker water tap as a complete package; sales, professional installation, on-site introduction and consultation by an authorized service partner.
Mobile heating unit
Mobile 210 kW heating unit for heating or domestic hot water preparation; transport to the site, commissioning, instruction and return after completion of the work.
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4.3/5

Estermann Rain AG

Trust & reputation

ranQ Trust Score of Estermann Rain AG: 4.3 out of 5.0

Trust Score4.3/ 5.0

Very high

x

Data basis 96% · As of October 2026

Estermann Rain 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%
Estermann Rain AG scores 85.5 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.55.07%
Estermann Rain 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%
Estermann Rain 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

Estermann Rain 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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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-108.074.103
Founded
1983 · 43 years
Last commercial register change
February 8, 2017
Employees
1 to 10
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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