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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,887 companies indexed · Last updated: today
DirectoryEnergy & EnvironmentSolar & PhotovoltaicsZumikonSonderegger AG Zumikon
Sonderegger AG Zumikon Logo
Verified· 3 sourcesTrust Score
Summary

About the company

The core activity of Sonderegger AG Zumikon is the planning, execution and maintenance of steep and flat roofs, including facades and skylights, as well as the installation of solar systems.

AI-generated
Offering

Products & services

Industry:Solar & Photovoltaics
✓ Offered6
Pitched roof
Pitched roofs with natural slate, reclaimed hand-made tiles, wooden shingles and special coverings; carried out by a traditional roofing contractor.
Flat roofing
Flat roofs with advice and installation for green roofs, terrace solutions and the use of solar energy as a supplier of heat or electricity.
Solar
Solar systems for domestic hot-water production, swimming-pool heating and photovoltaic systems; installation in collaboration with partners.
Facades
Ventilated facades to drain away moisture and reduce discolouration, algae growth and summer heat load.
Roof windows
Installation of VELUX roof windows in existing or new pitched roofs, service and installation products as well as flat-roof skylights.
Service and maintenance
Roof cleaning, inspections, maintenance and care, repairs as well as pest control on roof and facade.
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4.1/5

Sonderegger AG Zumikon

Trust & reputation

ranQ Trust Score of Sonderegger AG Zumikon: 4.1 out of 5.0

Trust Score4.1/ 5.0

High

x

Data basis 96% · As of October 2026

Sonderegger AG Zumikon scores 69.1 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.71.724%
  • 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.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.78.08%
Sonderegger AG Zumikon 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%
Sonderegger AG Zumikon scores 83.3 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).83.322%
Sonderegger AG Zumikon scores 17.1 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 35.17.14%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Sonderegger AG Zumikon reaches a ranQ Trust Score of 4.1 out of 5.0 — rated «High». The rating draws, among other things, on 4.6 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
4.6
of 5

Aggregated from 8 reviews across all connected sources

Sources
GGoogle4.68
★TrustpilotSoon
PProvenExpertSoon

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

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Location

Strubenacher 8
8126 Zumikon
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
Corporation
UID
CHE-107.146.846
Founded
1983 · 43 years
Last commercial register change
March 24, 2021
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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