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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint746,904 companies indexed · Last updated: today
DirectoryCrafts & TradesRooferSchlierenStern Dach GmbH
Stern Dach GmbH Logo
Verified· 3 sourcesTrust Score
Summary

About the company

The core activity of Stern Dach GmbH is the provision of services in the field of roof construction and maintenance, including: flat roof sealing, pitched roof installations, new roof construction, renovation of existing roofs, roof cleaning, roof maintenance and repairs, and fall protection systems. The company offers comprehensive solutions for private, commercial and industrial projects, focusing on the use of innovative technologies and materials to guarantee the highest quality, safety and durability.

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Service area

Offering

Products & services

Industry:Roofer
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3.9/5

Stern Dach GmbH

✓ Offered7
Flat roof waterproofing
Flat roof waterproofing with modern waterproofing systems, water protection, and thermal and energy advantages; durable solutions matched to the building structure.
Pitched roofs
Pitched roofs with tile roofing and other roof coverings; advice on materials and structures as well as installation for protection against wind, rain and snow.
Roof refurbishments
Roof refurbishments to restore functionality, remedy moisture damage and improve energy efficiency; including analysis of weak points and execution of the work.
Roof service and repairs
Roof maintenance and repairs to extend the roof’s service life; early detection of damage, rectification of defects and avoidance of more significant secondary damage.
New roof construction
New roof construction from planning through execution; roof solutions tailored to new builds using appropriate techniques and materials.
Fall protection systems
Fall protection systems for flat and pitched roofs to protect people during work at height; to reduce the risk of falls and ensure occupational safety.
24-hour on-call emergency service
24-hour on-call service for urgent roof issues such as leaks or storm damage; immediate support and availability around the clock.
Trust & reputation

ranQ Trust Score of Stern Dach GmbH: 3.9 out of 5.0

Trust Score3.9/ 5.0

High

x

Data basis 96% · As of November 2026

Stern Dach 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%
Stern Dach GmbH scores 57.1 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.39.612%
  • 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%
Stern Dach 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%
Stern Dach GmbH scores 0.0 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 35.0.04%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Stern Dach GmbH reaches a ranQ Trust Score of 3.9 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.

Knowledge

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Location

Zürcherstrasse 2
8952 Schlieren
Opening hours
Mon
07:00 - 17:00
Tue
07:00 - 17:00
Wed
07:00 - 17:00
Thu
07:00 - 17:00
Fri
07:00 - 17:00
Sat
Closed
Sun
Closed

At a glance

Legal form
Limited Liability Company
UID
CHE-400.123.538
Founded
2024 · 2 years
Last commercial register change
January 28, 2026
Employees
1 to 10

Active in 1 of 26 cantons · 1 municipality

  • ZHSchlieren
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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