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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,629 companies indexed · Last updated: today
DirectoryBusiness & Technical ServicesTechnical Consulting & EngineeringDübendorfGSAS AG
GSAS AG Logo
Verified· 3 sourcesTrust Score
Summary

About the company

The core activity of GSAS AG is the diagnosis, analysis and consulting of pollutants, particularly in the field of investigation and remediation of building pollutants such as asbestos. The company offers services such as sample preparation, laboratory evaluation, inventory and remediation support, and has accredited specialist personnel.

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Offering

Products & services

Industry:Technical Consulting & Engineering
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4.4/5

GSAS AG

✓ Offered3
Contaminant diagnostics
Inventory surveys, building check and cadastre; systematic identification of contaminated building materials and furnishings; air, material and surface sampling; assessment of the contamination situation.
Analysis of asbestos and other pollutants
Measurements of asbestos in indoor air according to VDI 3492, status-quo and final measurements, zone clearance measurements as well as material analyses of asbestos and other pollutants.
Remediation supervision
Remediation concept, remediation instructions, tender documents, quantity take-off, expert and measurement-based remediation supervision as well as product and outgassing investigations.
Trust & reputation

ranQ Trust Score of GSAS AG: 4.4 out of 5.0

Trust Score4.4/ 5.0

Very high

x

Data basis 96% · As of October 2026

GSAS AG scores 79.6 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.82.024%
  • 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.67.110%
  • 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%
GSAS AG scores 89.3 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.70.07%
GSAS AG 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%
GSAS AG scores 80.0 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 35.80.04%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

GSAS AG reaches a ranQ Trust Score of 4.4 out of 5.0 — rated «Very high». The rating draws, among other things, on 4.9 out of 5 stars from 13 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
4.9
of 5

Aggregated from 13 reviews across all connected sources

Sources
GGoogle4.913
★TrustpilotSoon
PProvenExpertSoon

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

Knowledge

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Location

Wilstrasse 105
8600 Dübendorf
Opening hours
Mon
08:00 - 16:00
Tue
08:00 - 16:00
Wed
08:00 - 16:00
Thu
08:00 - 16:00
Fri
08:00 - 16:00
Sat
Closed
Sun
Closed

At a glance

Legal form
Corporation
UID
CHE-112.622.982
Founded
2005 · 21 years
Last commercial register change
June 18, 2025
Employees
11 to 20
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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