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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,629 companies indexed · Last updated: today
DirectoryConstruction & ArchitectureBuilding ConstructionSionDumas Construction SA
Dumas Construction SA Logo
Verified· 3 sourcesTrust Score
Summary

About the company

Dumas Construction SA is a construction company operating as a general contractor across building, civil engineering and infrastructure projects. Its services include residential and industrial building works, roadworks, earthworks and public infrastructure, providing project support from design to handover while integrating sustainability measures.

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Products & services

Industry:Building Construction
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Dumas Construction SA

General Contractors
✓ Offered3
General contractor
Accompaniment of real estate projects from design to handover, supervision, scheduling, technical management and budget monitoring for villas and complex buildings.
Building construction
Construction of single- and multi-family homes, residential buildings, public buildings, commercial buildings, villas and chalets according to project requirements.
Civil engineering
Public works and road construction, development of galleries, collectors and networks, civil engineering structures, earthworks, urban development, foundations and demolition.
Trust & reputation

ranQ Trust Score of Dumas Construction SA: 4.4 out of 5.0

Trust Score4.4/ 5.0

Very high

x

Data basis 96% · As of October 2026

Dumas Construction SA 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.77.024%
  • 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.50.08%
Dumas Construction SA scores 97.5 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.90.07%
Dumas Construction SA 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%
Dumas Construction SA scores 74.3 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 35.74.34%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Dumas Construction SA reaches a ranQ Trust Score of 4.4 out of 5.0 — rated «Very high». The rating draws, among other things, on 4.7 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 October 2026.

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

Reviews

Aggregated rating

Aggregated rating
4.7
of 5

Aggregated from 15 reviews across all connected sources

Sources
GGoogle4.715
★TrustpilotSoon
PProvenExpertSoon

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

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Location

Route du Manège 63
1950 Sion
Opening hours
Mon
08:00 - 12:00, 13:30 - 17:30
Tue
08:00 - 12:00, 13:30 - 17:30
Wed
08:00 - 12:00, 13:30 - 17:30
Thu
08:00 - 12:00, 13:30 - 17:30
Fri
08:00 - 12:00, 13:30 - 17:30
Sat
Closed
Sun
Closed

At a glance

Legal form
Corporation
UID
CHE-105.857.385
Founded
1972 · 54 years
Last commercial register change
May 12, 2026
Employees
51 to 100
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.100.03%
    • Full methodology

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