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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,629 companies indexed · Last updated: today
DirectoryBusiness & Technical ServicesTechnical Consulting & EngineeringPetit-LancyGADZ SA
GADZ SA Logo
Verified· 2 sourcesTrust Score
Summary

About the company

GADZ SA is an engineering firm providing geotechnical, geological and hydrogeological services. It carries out site investigations and in‑situ measurements, laboratory soil and chemical analyses, foundation and infrastructure design, tunnel and underground works, and monitoring and consulting for groundwater and environmental issues.

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Products & services

Industry:Technical Consulting & Engineering
✓ Offered12
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4.1/5

GADZ SA

Geotechnical studies
Geotechnical studies for foundations, infrastructure structures, tunnels, galleries and sloping ground; reconnaissance campaigns, laboratory analyses, expert reports.
Underground works and infrastructure
Design and construction management for shallow and deep foundations, deep excavations, shoring, consolidation, waterproofing, tunnels, galleries and microtunnels.
Geotechnical monitoring and instrumentation
Study and monitoring of instrumentation, deformation monitoring, inclinometry, levelling, groundwater monitoring and hydrogeological checks.
Hydrogeology
Hydrogeological studies, groundwater monitoring, piezometry, pumping tests, drawdown controls, hydrogeological modelling and reports for authorities.
Stormwater infiltration services
Stormwater infiltration studies using drain trenches, swales or diffuse infiltration; boreholes, tests, preliminary sizing and hydrogeological report.
Geothermal services
Hydrogeological study for aquifer-based geothermal energy; reconnaissance boreholes, pumping tests, thermal plume simulation, coordination and final report.
Geothermal boreholes
Determination of the forecast geology and the thermal parameters of the subsurface, geological logging of the drilling cuttings, monitoring of gas inflows.
Environmental studies
Environmental studies for clients, representatives and contractors; environmental protection, management of materials and water, safety of personnel, administrative procedures.
Pollution diagnosis
Diagnosis according to the OLED for excavated materials: boreholes, sampling, analyses, interpretation, defining the future use of the materials and reporting to authorities.
Environmental monitoring of earthworks
Site monitoring for earthworks: materials management concept, documentary checks, sampling if needed and final report to authorities.
Pedological studies and soil management
Pedological studies, soil management concepts, pedological monitoring of the works and administrative support according to OSol.
Investigation of contaminated sites
Historical investigations, technical investigations, detailed investigations and remediation projects according to OSites.
Trust & reputation

ranQ Trust Score of GADZ SA: 4.1 out of 5.0

Trust Score4.1/ 5.0

High

x

Data basis 54% · As of October 2026

Without public customer reviews the score stays capped.

GADZ SA 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%
GADZ SA scores 84.8 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.89.612%
  • 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.70.07%
GADZ SA scores 83.3 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).83.322%
GADZ SA scores 31.4 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 35.31.44%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

GADZ SA reaches a ranQ Trust Score of 4.1 out of 5.0 — rated «High». No public customer reviews are available for this provider; the rating is based on the remaining criteria. The data basis is 54%, 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.

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Location

Hier entsteht die Karte
Chemin des Vignes 9
1213 Petit-Lancy

At a glance

Legal form
Corporation
UID
CHE-204.907.489
Founded
2015 · 11 years
Last commercial register change
October 22, 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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