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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint746,952 companies indexed · Last updated: today
DirectoryCrafts & TradesPlumberAllschwilZSG GmbH
ZSG GmbH Logo
Verified· 3 sourcesTrust Score
Summary

About the company

ZSG GmbH plans and installs plumbing and heating systems for new builds, conversions and renovations. Its services include plumbing and heating installations, repairs, maintenance and other customer services.

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Presence

Service area

Offering

Products & services

Industry:Plumber
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4.1/5

ZSG GmbH

✓ Offered12
Building Services & Sanitary Installations
Design and installation of sanitary installations for houses, including refurbishment of bathrooms, WCs and kitchens, as well as work for kitchen, bath/shower, laundry room and appliance installation.
New Builds & Conversions
Sanitary and building services for new builds and conversions, tailored to structural alterations, modernisation and project-specific installations.
Cold- & Hot-Water Installations
Installation of cold- and hot-water pipes and the associated water connections in the building.
Wastewater Installations
Execution of wastewater installations for house and building, including the necessary drainage connections.
Gas Installations
Gas installations in the building sector as part of building services and sanitary work.
Washrooms
Planning and execution of washrooms for residential and commercial properties.
Water Treatment / Descaling
Systems and measures for water treatment as well as descaling of domestic installations.
Water Heaters
Supply, installation and integration of water heaters into domestic installations.
Rainwater Utilisation
Plants and installations for the use of rainwater in the building and domestic environment.
Pumps
Planning, supply and installation of pumps for sanitary applications and drainage systems.
Main Underground Drainage & Building Drainage
Execution of main underground drainage lines and building drainage systems for the discharge of wastewater and rainwater.
Supply & Installation of Sanitary Fixtures
Supply and installation of sanitary fixtures for kitchen, bath/shower, WC and washrooms.
Trust & reputation

ranQ Trust Score of ZSG GmbH: 4.1 out of 5.0

Trust Score4.1/ 5.0

High

x

Data basis 96% · As of November 2026

ZSG GmbH scores 71.4 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.76.724%
  • 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.45.610%
  • 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%
ZSG GmbH scores 75.7 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.55.07%
ZSG GmbH scores 86.7 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).86.722%
ZSG GmbH scores 1.4 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 35.1.44%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

ZSG GmbH reaches a ranQ Trust Score of 4.1 out of 5.0 — rated «High». The rating draws, among other things, on 5.0 out of 5 stars from 5 customer reviews. The data basis is 96%, so the score is backed by part of the criteria. As of November 2026.

The Trust Score cannot be bought and is calculated from publicly verifiable data.

Reviews

Aggregated rating

Aggregated rating
5
of 5

Aggregated from 5 reviews across all connected sources

Sources
GGoogle55
★TrustpilotSoon
PProvenExpertSoon

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

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Location

Bettenstrasse 81a
4123 Allschwil
Opening hours
Mon
07:00 - 17:30
Tue
07:00 - 17:30
Wed
07:00 - 17:30
Thu
07:00 - 17:30
Fri
07:00 - 17:30
Sat
Closed
Sun
Closed

At a glance

Legal form
Limited Liability Company
UID
CHE-278.164.686
Founded
2017 · 9 years
Last commercial register change
March 4, 2021
Employees
1 to 10

Active in 1 of 26 cantons · 1 municipality

  • BLAllschwil
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.
88.0
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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