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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,765 companies indexed · Last updated: today
DirectoryConstruction & ArchitectureArchitecture FirmsChâteau-D'OexBlum Sieber Architectes Sàrl
Blum Sieber Architectes Sàrl Logo
Verified· 2 sourcesTrust Score
Summary

About the company

Blum Sieber Architectes Sàrl is an architectural practice that designs and manages a wide range of building types, including single- and multi-family housing, industrial, administrative, commercial, accommodation, agricultural and historic buildings. Services include feasibility and project studies, permit and execution planning, tender documentation and site supervision, as well as energy assessments (CECB, Minergie) and fire-protection expertise in line with AEAI standards.

AI-generated
Offering

Products & services

Industry:Architecture Firms
✓ Offered3
Architectural practice
Project studies, preliminary design, scaled plans, cost estimates, building permit application, calls for tenders, construction management and acceptance of the work.
Energy study
Thermal balances, CECB and CECB Plus forms, support for energy renovations and energy refurbishment work, coordination of parties involved and administrative procedures.
Fire safety
Advice and monitoring in fire protection (AEAI), role as a fire protection specialist, quality assurance level II and project support through to acceptance.
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4.1/5

Blum Sieber Architectes Sàrl

Trust & reputation

ranQ Trust Score of Blum Sieber Architectes Sàrl: 4.1 out of 5.0

Trust Score4.1/ 5.0

High

x

Data basis 54% · As of October 2026

Blum Sieber Architectes Sàrl 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.
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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%
Blum Sieber Architectes Sàrl scores 73.9 out of 100 points in the Substance area of the ranQ Trust Score. This area carries 28% of the weighting.
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CriterionValueWeight
  • Establishment: Years since founding or brand launch, logarithmic. The maximum is reached at 15 years.75.012%
  • 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%
Blum Sieber Architectes Sàrl scores 85.0 out of 100 points in the Identity area of the ranQ Trust Score. This area carries 22% of the weighting.
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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%
Blum Sieber Architectes Sàrl 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

Blum Sieber Architectes Sàrl 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

Grand Rue 66
1660 Château-D'Oex
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
Sat
Closed
Sun
Closed

At a glance

Legal form
Limited Liability Company
UID
CHE-457.771.516
Founded
2019 · 7 years
Last commercial register change
May 11, 2023
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.
88.0
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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