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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,887 companies indexed · Last updated: today
DirectoryBusiness & Technical ServicesTechnical Consulting & EngineeringSt. GallenRalf Zumstein Architektur GmbH
Ralf Zumstein Architektur GmbH Logo
Verified· 2 sourcesTrust Score
Summary

About the company

Ralf Zumstein Architektur GmbH is an architecture firm that plans and delivers new builds, conversions, renovations and refurbishments. Its services also include feasibility studies, building analyses and advice, with a focus on existing buildings and heritage-protected properties.

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Offering

Products & services

Industry:Technical Consulting & EngineeringArchitecture Firms
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3.6/5

Ralf Zumstein Architektur GmbH

✓ Offered5
Architectural planning for new builds
Architectural planning for new builds with design of space, form, materials and proportions, aligned with the surroundings and the building's interior life.
Conversions and refurbishments
Conversions, refurbishments and renovations with careful analysis, existing-condition surveys and targeted architectural interventions in existing buildings.
Heritage conservation and building preservation
Work with listed buildings and local heritage protection, including expert planning under preservation requirements and respectful interventions in existing structures.
Feasibility studies and building analyses
Feasibility studies, building analyses and consultations to assess buildings, potential and planning options before an intervention.
Urban design and area development
Urban design and area development with planning for neighbourhoods, sites and larger spatial contexts.
Trust & reputation

ranQ Trust Score of Ralf Zumstein Architektur GmbH: 3.6 out of 5.0

Trust Score3.6/ 5.0

Solid

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Data basis 54% · As of October 2026

Ralf Zumstein Architektur GmbH 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%
Ralf Zumstein Architektur GmbH scores 40.1 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.0.012%
  • 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%
Ralf Zumstein Architektur GmbH scores 83.3 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).83.322%
Ralf Zumstein Architektur GmbH scores 51.4 out of 100 points in the Visibility area of the ranQ Trust Score. This area carries 8% of the weighting.
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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 35.51.44%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Ralf Zumstein Architektur GmbH reaches a ranQ Trust Score of 3.6 out of 5.0 — rated «Solid». 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.

Knowledge

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Location

Brühlbleichestrasse 5
9000 St. Gallen

At a glance

Legal form
Limited Liability Company
UID
CHE-321.857.752
Founded
2026 · 0 years
Last commercial register change
February 3, 2026
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.70.03%
    • Full methodology

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