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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,887 companies indexed · Last updated: today
DirectoryConstruction & ArchitectureInterior ConstructionGontenschwilWilli Sommerhalder Holz- und Treppenbau GmbH
Willi Sommerhalder Holz- und Treppenbau GmbH Logo
Verified· 3 sourcesTrust Score
Summary

About the company

The company's core activity is providing services in the field of timber construction, particularly in the areas of carpentry, staircase construction and interior finishing. The company offers competent solutions for woodwork and specializes in the planning and execution of timber construction projects in the Aargau region.

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Products & services

Industry:Interior ConstructionTimber Construction & Carpentry
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3.6/5

Willi Sommerhalder Holz- und Treppenbau GmbH

✓ Offered2
Carpentry / Timber construction
Planning, organisation and installation of timber elements; roof trusses, dormers, carports, canopies, hall construction, scaffold and balcony construction, prefabricated element construction, as well as renovations.
Interior fit-out
Custom interior fit-out to measure; expert advice, cost-effective fabrication and efficient installation for various shapes, colours and finishes.
Trust & reputation

ranQ Trust Score of Willi Sommerhalder Holz- und Treppenbau GmbH: 3.6 out of 5.0

Trust Score3.6/ 5.0

Solid

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Data basis 96% · As of October 2026

Willi Sommerhalder Holz- und Treppenbau GmbH scores 51.4 out of 100 points in the Reputation area of the ranQ Trust Score. This area carries 42% of the weighting.
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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.66.724%
  • 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.27.910%
  • 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.35.08%
Willi Sommerhalder Holz- und Treppenbau GmbH scores 65.0 out of 100 points in the Substance area of the ranQ Trust Score. This area carries 28% of the weighting.
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CriterionValueWeight
  • Establishment: Years since founding or brand launch, logarithmic. The maximum is reached at 15 years.58.012%
  • 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%
Willi Sommerhalder Holz- und Treppenbau GmbH 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%
Willi Sommerhalder Holz- und Treppenbau GmbH scores 2.6 out of 100 points in the Visibility area of the ranQ Trust Score. This area carries 8% of the weighting.
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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 35.2.64%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Willi Sommerhalder Holz- und Treppenbau GmbH reaches a ranQ Trust Score of 3.6 out of 5.0 — rated «Solid». The rating draws, among other things, on 4.5 out of 5 stars from 2 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
4.5
of 5

Aggregated from 2 reviews across all connected sources

Sources
GGoogle4.52
★TrustpilotSoon
PProvenExpertSoon

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

Knowledge

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Comparisons

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Location

Hinterdorfstrasse 278
5728 Gontenschwil

At a glance

Legal form
Limited Liability Company
UID
CHE-496.876.886
Founded
2022 · 4 years
Last commercial register change
April 21, 2026
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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