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

About the company

The core activity of Robert Keller AG is the provision of services and solutions in the field of building technology, particularly in the areas of sanitation, heating, piping and ventilation. The company offers installations, repairs and maintenance in these areas and is also responsible for the water supply of Untersiggenthal.

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Offering

Products & services

Industry:Plumbing & Building ServicesSheet Metal Work
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4.2/5

Robert Keller AG

✓ Offered4
Sanitary Installations and Bathroom Renovations
Sanitary installations for fresh water and wastewater, new builds and bathroom remodels, including planning, execution, construction management for bathroom renovations, repair service and boiler descaling.
Heating Installations
Heating work including replacement of radiator valves with thermostatic valves, support with other heating issues and concerns, plus larger projects with partner contractors.
Ventilation Installations
Small ventilation systems and comfort ventilation for new and existing buildings, plus service and repairs for bathroom fans.
Utility Line Construction
Planning and laying utility lines in cast iron or polyethylene, including new main water lines and replacement of existing lines.
Trust & reputation

ranQ Trust Score of Robert Keller AG: 4.2 out of 5.0

Trust Score4.2/ 5.0

Very high

x

Data basis 96% · As of October 2026

Robert Keller AG scores 74.7 out of 100 points in the Reputation area of the ranQ Trust Score. This area carries 42% of the weighting.
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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.79.424%
  • 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.52.910%
  • 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.88.08%
Robert Keller 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%
Robert Keller AG scores 83.3 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).83.322%
Robert Keller AG scores 10.9 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 35.10.94%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Robert Keller AG reaches a ranQ Trust Score of 4.2 out of 5.0 — rated «Very high». The rating draws, among other things, on 5.0 out of 5 stars from 7 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 7 reviews across all connected sources

Sources
GGoogle57
★TrustpilotSoon
PProvenExpertSoon

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

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Location

Dorfstrasse 2
5417 Untersiggenthal

At a glance

Legal form
Corporation
UID
CHE-107.127.932
Founded
1981 · 45 years
Last commercial register change
July 3, 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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