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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint746,952 companies indexed · Last updated: today
DirectoryCrafts & TradesRooferAlterswilenKoller Dach Steil und Flach
Koller Dach Steil und Flach Logo
Verified· 2 sourcesTrust Score
Summary

About the company

Koller Dach Steil und Flach carries out work on pitched and flat roofs and provides façade, insulation and roof-window services.

AI-generated
Presence

Service area

Offering

Products & services

Industry:Roofer
✓ Offered4
Pitched and flat roofs
Pitched and flat roofs for new builds, conversions and renovations; roofing work for residential and commercial buildings.
Facades
Facade work for buildings, coordinated with roofing and renovation projects.
Insulations
Insulations for roofs and buildings as part of new-build and conversion projects.
Roof windows
Roof windows for pitched and flat roofs, including installation in connection with roofing work.
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Koller Dach Steil und Flach

Trust & reputation

ranQ Trust Score of Koller Dach Steil und Flach

Trust Score

No score yet

x

A published score requires a data basis of at least 50% and data from at least two criteria groups other than identity. Missing evidence: Review quality, Review volume, Review recency, Media authority

Data basis 54% · As of November 2026

Koller Dach Steil und Flach has no value in the Reputation area of the ranQ Trust Score because no data is available. The area carries 42% of the weighting and drops out of the calculation for this profile; it does not lower the score, only the reported data basis.
x
CriterionValueWeight
  • Review quality: No data point — the criterion is taken out of the weighting and does not lower the score.—24%
  • Review volume: No data point — the criterion is taken out of the weighting and does not lower the score.—10%
  • Review recency: No data point — the criterion is taken out of the weighting and does not lower the score.—8%
Koller Dach Steil und Flach scores 78.5 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%
Koller Dach Steil und Flach 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%
Koller Dach Steil und Flach 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%

The data basis is 54%, below the threshold at which ranQ publishes a score. Evidence is missing for: Review quality, Review volume, Review recency, Media authority. As of November 2026.

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

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Location

Am Bach 6
8573 Alterswilen

At a glance

Legal form
Sole proprietorship
UID
CHE-106.582.044
Founded
1990 · 36 years
Last commercial register change
November 22, 2007
Employees
1 to 10

Active in 1 of 26 cantons · 1 municipality

  • TGKemmental
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.
67.0
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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