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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,629 companies indexed · Last updated: today
DirectoryConstruction & ArchitectureArchitecture FirmsZurichStefan Frei, Architektur
Stefan Frei, Architektur Logo
Verified· 2 sourcesTrust Score
Summary

About the company

The company's core activity is architecture, particularly the planning, design and construction management of buildings such as residential houses, office buildings, holiday homes, medical practices and commercial buildings. The company also offers consulting services such as cost estimates, property reports and strategies for preserving value.

AI-generated
Offering

Products & services

Industry:Architecture Firms
✓ Offered6
Architecture, design, planning and site supervision
Architecture, design, planning and site supervision for new construction, conversions, listed-building protection and renovation; for residential properties, office buildings, holiday homes, doctors’ surgeries and commercial buildings.
Renovation and refurbishment
Renovation and refurbishment of residential buildings, multi-family houses, single-family homes, holiday homes, office and practice buildings; also with listed-building protection and phased projects.
New construction
New construction of residential buildings and other structures; documented, among other things, for single-family homes, multi-family houses and a residential high-rise.
Conversion and extension
Conversion and extension of single-family homes, multi-family houses, holiday homes and other existing buildings; also including finishing attic spaces and self-contained annex apartments.
Advisory for purchase, cost estimates and property reports
Advisory for purchase, cost estimates and property reports for assessing existing properties, costs and potential for development.
Energy optimisation and MINERGIE
Energy optimisation, MINERGIE and ecological aspects for new construction, conversions and renovation.
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4.1/5

Stefan Frei, Architektur

Trust & reputation

ranQ Trust Score of Stefan Frei, Architektur: 4.1 out of 5.0

Trust Score4.1/ 5.0

High

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Data basis 54% · As of October 2026

Without public customer reviews the score stays capped.

Stefan Frei, Architektur 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%
Stefan Frei, Architektur scores 78.5 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.55.07%
Stefan Frei, Architektur 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%
Stefan Frei, Architektur scores 5.1 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 35.5.14%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Stefan Frei, Architektur 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

Rautistrasse 30
8047 Zurich

At a glance

Legal form
Sole proprietorship
UID
CHE-104.554.048
Founded
2011 · 15 years
Last commercial register change
January 23, 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.
67.0
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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