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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,937 companies indexed · Last updated: today
DirectoryCrafts & TradesPlumbing & Building ServicesFreidorf TgKoller GmbH Spenglerei und Sanitär
Koller GmbH Spenglerei und Sanitär Logo
Verified· 3 sourcesTrust Score
Summary

About the company

The core activity of Koller GmbH Spengler / Sanitär encompasses the provision of services in the areas of sanitary installations, sheet metal work, and roofing. Specifically, the company offers the following services: Sanitary installations: planning and execution of bathrooms, service and repair work; Sheet metal work: facade cladding, metal roofs, lightning protection and rainwater utilization; Roofing: new constructions, conversions and renovations of roofs. Thus, the company offers a comprehensive range of services in the field of building technology and equipment.

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Products & services

Industry:Plumbing & Building Services
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4.0/5

Koller GmbH Spenglerei und Sanitär

Roofing
Sheet Metal Work
✓ Offered9
Sanitary installations
Sanitary installations for new builds, conversions and renovations; advice, onsite measurement, analysis of existing installations, planning, quotation, execution planning and maintenance.
Sheet metal work
Sheet metal work for roofs and facades; cladding for dormers, surrounds, double standing-seam roofs, Prefa roofs, gutters, downspouts, chimney cladding and custom-made special fabrications.
Roofing
Metal roofs and facades; processing of strips, sheets and special forms such as shingles, scale tiles, clamping seam profiles or lozenges for new build and renovation.
Service repairs
Repairs and service work for burst pipes, clogged drains and WCs, faulty washbasins, descaling of boilers and pipework, and replacement of sanitary appliances.
Boiler service
Boiler service for hot water cylinders and boilers; advice, periodic maintenance, line protection and reduction of limescale deposits.
Water softening system
Water softening system for soft water, to reduce limescale deposits and protect fittings, tiles, skin and hair.
Rainwater use
Rainwater use for toilet flushing and garden irrigation; collection, use and distribution via a separate network to reduce drinking water consumption.
Facade cladding
Sheet metal facade cladding for chimneys, fascia and gable boards, dormers, garage doors, doors, facades, balconies, roof terraces and entrance canopies.
Lightning protection
Lightning protection systems with planning and installation according to binding guidelines to protect the house and its occupants from lightning damage.
Trust & reputation

ranQ Trust Score of Koller GmbH Spenglerei und Sanitär: 4.0 out of 5.0

Trust Score4.0/ 5.0

High

x

Data basis 96% · As of October 2026

Koller GmbH Spenglerei und Sanitär scores 59.7 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.73.124%
  • 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.35.310%
  • 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.50.08%
Koller GmbH Spenglerei und Sanitär scores 83.0 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%
Koller GmbH Spenglerei und Sanitär scores 85.0 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).85.022%
Koller GmbH Spenglerei und Sanitär scores 9.1 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 35.9.14%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Koller GmbH Spenglerei und Sanitär reaches a ranQ Trust Score of 4.0 out of 5.0 — rated «High». The rating draws, among other things, on 5.0 out of 5 stars from 3 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 3 reviews across all connected sources

Sources
GGoogle53
★TrustpilotSoon
PProvenExpertSoon

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

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Location

Erchenwilerstrasse 2
9306 Freidorf Tg
Opening hours
Mon
08:00 - 12:00, 13:00 - 17:00
Tue
08:00 - 12:00, 13:00 - 17:00
Wed
08:00 - 12:00, 13:00 - 17:00
Thu
08:00 - 12:00, 13:00 - 17:00
Fri
08:00 - 12:00, 13:00 - 17:00
Sat
Closed
Sun
Closed

At a glance

Legal form
Limited Liability Company
UID
CHE-114.643.995
Founded
2008 · 18 years
Last commercial register change
January 14, 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.88.06%
  • 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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