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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,887 companies indexed · Last updated: today
DirectoryConstruction & ArchitectureArchitecture FirmsZurichWilli Tehlar, Dipl. Architekten ETH SIA
Willi Tehlar, Dipl. Architekten ETH SIA Logo
Verified· 2 sourcesTrust Score
Summary

About the company

Willi Tehlar, Dipl. Architekten ETH SIA is an architectural practice providing project and execution planning, construction management and overall architectural services for new-build and renovation projects, and offering building valuation services.

AI-generated
Offering

Products & services

Industry:Architecture Firms
✓ Offered5
Architecture for New Construction
New-build construction of residential houses, multi-family houses, doctors' houses, schools and senior centers; preliminary project, project planning, execution planning, tendering, site management and overall service.
Alterations and Refurbishments
Alterations, interior finishing and refurbishment of single-family houses, multi-family houses and other buildings; interior alterations, roof extension, additions, energy-related external refurbishment and site management.
Preliminary Studies and Concept Studies
Preliminary project studies, concept studies and utilization studies for new-build, alteration and refurbishment projects; building surveys, clarifications and development of use concepts.
Design and Idea Competitions
Preparation of public design and idea competitions for municipal buildings, schools, senior centers, residential developments and administrative buildings.
Collaboration on Specialized and Subprojects
Participation in subprojects and joint project work with other architectural firms, such as project planning, execution planning, façade design and detailed design.
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4.1/5

Willi Tehlar, Dipl. Architekten ETH SIA

Trust & reputation

ranQ Trust Score of Willi Tehlar, Dipl. Architekten ETH SIA: 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.

Willi Tehlar, Dipl. Architekten ETH SIA 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%
Willi Tehlar, Dipl. Architekten ETH SIA scores 78.5 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.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%
Willi Tehlar, Dipl. Architekten ETH SIA 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%
Willi Tehlar, Dipl. Architekten ETH SIA scores 20.0 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 35.20.04%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Willi Tehlar, Dipl. Architekten ETH SIA 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

Dammstrasse 5
8037 Zurich

At a glance

Legal form
Sole proprietorship
UID
CHE-107.464.134
Founded
2009 · 17 years
Last commercial register change
September 24, 2025
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.67.06%
  • Branch offices: Branch offices linked in the commercial register. Having none is normal and costs no points.70.03%
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