ranQ
ranQ
ranQ
DirectoryIndustriesPlacesKnowledgeComparisonsSoon
Sign inCheck visibility
ranQHSG Startup LabelRecognised by the
HSG Startup Label

The leading AI company directory, built to boost AI visibility.

DEENFRIT
Product
  • Pricing
  • Directory
  • Industries
  • Trust Score
Company
  • About
  • Contact
  • Legal
© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,629 companies indexed · Last updated: today
DirectoryConstruction & ArchitectureInterior ConstructionSionBlanc & Duc SA
Blanc & Duc SA Logo
Verified· 3 sourcesTrust Score
Summary

About the company

The core activity of Blanc & Duc SA is the provision of services in the field of construction and renovation work, particularly in the areas of: plastering, false ceilings, peripheral insulation, painting, decoration, renovation and maintenance of buildings. The company thus offers a wide range of services in the field of construction and renovation work and positions itself as a full-service provider for its customers.

AI-generated
Offering

Products & services

Industry:Interior Construction
✓ Offered5
Plastering work
Plastering work for new builds and renovations, light partition walls, plasterwork in apartments, rental properties, villas and commercial premises.
Painting
Interior and exterior painting, wallpapering, paintable wall coverings, decorative coatings, render, wood treatments, and floor and concrete paints.
External wall insulation
Thermal insulation from the outside of buildings, using polystyrene boards, to avoid thermal bridges and create insulated facades.
Renovation
Renovation work for bedrooms, villas and rental properties, including plastering, painting, decoration, insulation and maintenance.
Wallpaper installation
Wallpaper installation with patterns, custom-made decors and decorative coverings to personalize the interior.
LeadhubOutbound Leads by COHAGA

Looking for direct email addresses and phone numbers?

Leadhub delivers verified contact details and decision-makers from over 750,000 Swiss companies — management, procurement, marketing, HR.

Discover Leadhub
4.2/5

Blanc & Duc SA

Trust & reputation

ranQ Trust Score of Blanc & Duc SA: 4.2 out of 5.0

Trust Score4.2/ 5.0

Very high

x

Data basis 96% · As of October 2026

Blanc & Duc SA scores 70.2 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.82.524%
  • 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.68.910%
  • 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%
Blanc & Duc SA scores 92.3 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.82.07%
Blanc & Duc 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%
Blanc & Duc SA scores 25.7 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 35.25.74%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Blanc & Duc SA reaches a ranQ Trust Score of 4.2 out of 5.0 — rated «Very high». The rating draws, among other things, on 4.9 out of 5 stars from 14 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 14 reviews across all connected sources

Sources
GGoogle4.914
★TrustpilotSoon
PProvenExpertSoon

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

Knowledge

No knowledge articles yet

Once Blanc & Duc SA has claimed this profile, we'll publish editorial articles and case studies here together.

Get started
Comparisons

Blanc & Duc SA in comparison

Soon

Industry comparisons are coming soon

We're preparing industry comparisons that rank Blanc & Duc SA by reviews, experience and specialisations.

Is this your company?

Claim the company profile of Blanc & Duc SA to make its contact details visible. With a plan we additionally create and publish industry comparisons, articles and much more.

Secure profile

Location

Chemin des Collines 41
1950 Sion
Opening hours
Mon
08:00 - 17:00
Tue
08:00 - 17:00
Wed
08:00 - 17:00
Thu
08:00 - 17:00
Fri
08:00 - 17:00
Sat
Closed
Sun
Closed

At a glance

Legal form
Corporation
UID
CHE-102.272.834
Founded
1988 · 38 years
Last commercial register change
December 22, 2017
Employees
21 to 50
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

    Similar companies

    GG
    GENOA GmbH
    Visp
    PG
    PA Generalunternehmung GmbH
    Glis
    KD
    Krasniqi, DER MALER GmbH
    Glis
    LL
    Laurent Lattion
    Collombey
    MS
    MarQueBois Sàrl
    Muraz (Sierre)
    DR
    DH Rénovation Holczak
    Collombey
    WR
    William Rey & Fille Plâtre-Peinture Sàrl
    Ollon Vs
    FS
    Flagyps SA
    Fully