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

About the company

The core activity of Steiner + Herzog AG is the installation, repair and maintenance of heating systems, sanitary systems, solar systems, oil-fired boilers and gas-fired boilers, as well as the installation of special equipment such as water softening systems, closomats and washing appliances.

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Offering

Products & services

Industry:Plumbing & Building ServicesSpecialized Construction Installations
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4.0/5

Steiner + Herzog AG

✓ Offered5
Heating systems
Heating renovation, new installation of heating systems, installation of all heat distribution systems as well as maintenance and servicing work; planning and installation of oil, gas and wood heating boilers as well as heat pumps.
Sanitary installations
Complete installations in new builds and conversions, bathroom renovations, repair work, water softeners, descaling of boilers and maintenance of fine filters; also special units such as Closomaten and washing units.
Comfort ventilation
Consulting, design and installation of comfort ventilation systems for controlled minimum fresh-air supply and improved air quality in airtight buildings.
Solar thermal systems
Consulting, design and installation of solar thermal systems for new builds and existing buildings; heat production from solar energy.
Oil burner service
Troubleshooting, periodic maintenance, repair and replacement as well as official flue gas measurements on oil burners of practically all makes.
Trust & reputation

ranQ Trust Score of Steiner + Herzog AG: 4.0 out of 5.0

Trust Score4.0/ 5.0

High

x

Data basis 96% · As of October 2026

Steiner + Herzog AG scores 63.4 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.58.324%
  • 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.55.910%
  • 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%
Steiner + Herzog 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%
Steiner + Herzog 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%
Steiner + Herzog AG scores 1.1 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 35.1.14%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Steiner + Herzog AG reaches a ranQ Trust Score of 4.0 out of 5.0 — rated «High». The rating draws, among other things, on 4.0 out of 5 stars from 8 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
of 5

Aggregated from 8 reviews across all connected sources

Sources
GGoogle48
★TrustpilotSoon
PProvenExpertSoon

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

Knowledge

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Comparisons

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Location

Oholten 11
5703 Seon
Opening hours
Mon
07:30 - 12:00, 13:00 - 17:00
Tue
07:30 - 12:00, 13:00 - 17:00
Wed
07:30 - 12:00, 13:00 - 17:00
Thu
07:30 - 12:00, 13:00 - 17:00
Fri
07:30 - 12:00, 13:00 - 17:00
Sat
Closed
Sun
Closed

At a glance

Legal form
Corporation
UID
CHE-106.004.095
Founded
1986 · 40 years
Last commercial register change
July 8, 2014
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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