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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,887 companies indexed · Last updated: today
DirectoryConstruction & ArchitectureArchitecture FirmsYverdon-Les-BainsAtelier quatre cent un SA
Atelier quatre cent un SA Logo
Verified· 3 sourcesTrust Score
Summary

About the company

Atelier quatre cent un SA is an architectural practice providing design, project management and site supervision for public and private building projects, including schools, municipal pools, medico‑social facilities, residential and industrial buildings. The firm is a Minergie specialist partner and emphasises aesthetics, durability, ecological considerations and collaboration with local craftsmen.

AI-generated
Offering

Products & services

Industry:Architecture Firms
✓ Offered6
Architecture
Architectural projects for public contracts and private mandates, from study to implementation; single- and multi-family constructions, school facilities, municipal swimming pools, EMS, factories, hotels.
Construction site supervision
Construction site supervision for construction and transformation projects, with monitoring of deadlines, budgets and coordination with clients and contractors.
Renovation and refurbishment
Transformation of existing buildings, energy retrofits, extensions, refurbishments and conversions of premises or dwellings, including protected and rural buildings.
Multi-family and family homes
Projects for family houses, twin houses, multi-family residential buildings, residences and housing areas, in an urban or rural setting.
School architecture and public facilities
Projects for schools, middle schools, gymnasiums, school and sports centres, administrative buildings and other public facilities.
Medical and social care architecture
Projects for medical and social care facilities, sheltered housing for seniors, and layouts related to care and support.
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4.0/5

Atelier quatre cent un SA

Trust & reputation

ranQ Trust Score of Atelier quatre cent un SA: 4.0 out of 5.0

Trust Score4.0/ 5.0

High

x

Data basis 96% · As of October 2026

Atelier quatre cent un SA scores 56.6 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.70.824%
  • 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.27.910%
  • 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.50.08%
Atelier quatre cent un SA scores 87.1 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%
Atelier quatre cent un 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%
Atelier quatre cent un SA scores 17.1 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 35.17.14%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Atelier quatre cent un SA reaches a ranQ Trust Score of 4.0 out of 5.0 — rated «High». The rating draws, among other things, on 5.0 out of 5 stars from 2 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
5
of 5

Aggregated from 2 reviews across all connected sources

Sources
GGoogle52
★TrustpilotSoon
PProvenExpertSoon

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

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Location

Rue d'Orbe 3
1400 Yverdon-Les-Bains
Opening hours
Mon
08:00 - 12:00, 13:30 - 17:00
Tue
08:00 - 12:00, 13:30 - 17:00
Wed
08:00 - 12:00, 13:30 - 17:00
Thu
08:00 - 12:00, 13:30 - 17:00
Fri
08:00 - 12:00, 13:30 - 17:00
Sat
Closed
Sun
Closed

At a glance

Legal form
Corporation
UID
CHE-106.776.341
Founded
1991 · 35 years
Last commercial register change
July 1, 2024
Employees
1 to 10
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.85.03%
    • Full methodology

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