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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint746,904 companies indexed · Last updated: today
DirectoryConstruction & ArchitectureRenovationGrenchenGSK Bau AG
GSK Bau AG Logo
Verified· 3 sourcesTrust Score
Summary

About the company

GSK Bau AG provides construction and renovation services for kitchens, bathrooms and complete refurbishments of single- and multi-family homes. Its services include carpentry, kitchen and furniture work, tiling, floor and wall coverings, masonry, plastering and concrete renovation.

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Service area

Offering

Products & services

Industry:Renovation
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GSK Bau AG

✓ Offered11
Alterations
Alterations for kitchens, bathrooms and other living areas; coordinated execution from a single source with multiple trades.
Refurbishments
Refurbishments of single- and multi-family houses, as well as comprehensive overall refurbishments with various fit-out and construction works.
Renovations
Renovations with general building, fit-out and surface works, coordinated with alteration and refurbishment projects.
Kitchen construction
Kitchen construction including kitchen alterations, kitchen installation and matching carpentry works for installation and adaptation.
Bathroom refurbishments
Bathrooms and bathroom alterations, from renewing individual elements to complete refurbishment.
Carpentry work
General carpentry work, built-in cupboards, furniture, doors, wall cladding and other woodwork.
Plastering work
Plastering work as part of alterations, renovations and refurbishments, including supplementary and adaptation works.
Tiling work
Tiling work for wall and floor coverings, in particular ceramic coverings in alteration and refurbishment projects.
Floor coverings
Parquet, linoleum and other floor coverings as part of alterations, renovations and refurbishments.
Masonry work
Masonry work and minor structural adaptations, supplemented by core drilling and other structural works.
Window and door work
Windows and doors for interior and exterior use, including adaptation and installation as part of alterations and refurbishments.
Trust & reputation

ranQ Trust Score of GSK Bau AG: 4.2 out of 5.0

Trust Score4.2/ 5.0

Very high

x

Data basis 96% · As of November 2026

GSK Bau AG scores 70.3 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.62.024%
  • 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.70.510%
  • 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.95.08%
GSK Bau AG 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%
GSK Bau AG 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%
GSK Bau AG scores 2.6 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 35.2.64%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

GSK Bau AG reaches a ranQ Trust Score of 4.2 out of 5.0 — rated «Very high». The rating draws, among other things, on 4.2 out of 5 stars from 15 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
4.2
of 5

Aggregated from 15 reviews across all connected sources

Sources
GGoogle4.215
★TrustpilotSoon
PProvenExpertSoon

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

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Location

Witmattstrasse 16
2540 Grenchen
Opening hours
Mon
07:30 - 11:45, 13:30 - 17:00
Tue
07:30 - 11:45, 13:30 - 17:00
Wed
07:30 - 11:45, 13:30 - 17:00
Thu
07:30 - 11:45, 13:30 - 17:00
Fri
07:30 - 11:45, 13:30 - 17:00
Sat
Closed
Sun
Closed

At a glance

Legal form
Corporation
UID
CHE-106.400.723
Founded
1989 · 37 years
Last commercial register change
June 10, 2026
Employees
1 to 10

Active in 1 of 26 cantons · 1 municipality

  • SOGrenchen
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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