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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint746,904 companies indexed · Last updated: today
DirectoryConstruction & ArchitectureArchitectZurichDiethelm & Spillmann GmbH
Diethelm & Spillmann GmbH Logo
Verified· 3 sourcesTrust Score
Summary

About the company

Diethelm & Spillmann GmbH is an architecture practice working on new buildings, conversions, extensions and historic preservation projects. Its services also include feasibility studies, condition assessments and expert reports.

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Service area

Offering

Products & services

Industry:Architect
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Diethelm & Spillmann GmbH

Architectural Services
Architecture for new builds, conversions, extensions and refurbishments; housing, school buildings, museums and other public or private building projects.
Studies, Expert Assessments and Reports
Feasibility studies, condition analyses and expert reports for building projects and existing properties; also focused on refurbishment and work on the built stock.
Research and Architectural Investigation
Research on the built heritage, materiality and building history; investigations into topics such as masonry, Fural and other architectural questions.
Teaching and Design Studios
Teaching at universities with studio work, design exercises, guest critiques and supervision of architecture students.
Publications and Professional Articles
Publications on projects, built heritage and architectural topics; contributions in specialist journals, yearbooks and architecture publishers.
Trust & reputation

ranQ Trust Score of Diethelm & Spillmann GmbH: 4.1 out of 5.0

Trust Score4.1/ 5.0

High

x

Data basis 58% · As of November 2026

Without public customer reviews the score stays capped.

Diethelm & Spillmann 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%
Diethelm & Spillmann GmbH scores 84.6 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%
Diethelm & Spillmann GmbH scores 88.3 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).88.322%
Diethelm & Spillmann GmbH scores 21.5 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 35.42.94%
  • Media authority: Quality and number of editorial mentions, weighted by the importance of the source, plus the recency of the latest high-quality mention.0.04%
Qualifications+0.00

Diethelm & Spillmann GmbH 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 58%, so the score is backed by part of the criteria. As of November 2026.

The Trust Score cannot be bought and is calculated from publicly verifiable data.

Press

Media

September 9, 2021Media
Treppen zum Licht -
swiss-architects.com
March 2, 2017Media
Backstein am Hang
swiss-architects.com

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Location

Räffelstrasse 11
8045 Zurich

At a glance

Legal form
Limited Liability Company
UID
CHE-105.194.403
Founded
2001 · 25 years
Last commercial register change
February 12, 2009
Employees
1 to 10

Active in 1 of 26 cantons · 1 municipality

  • ZHZurich
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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