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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,887 companies indexed · Last updated: today
DirectoryConstruction & ArchitectureArchitecture FirmsZurichBoltshauser / Drees & Sommer GmbH
Boltshauser / Drees & Sommer GmbH Logo
Verified· 4 sourcesTrust Score
Summary

About the company

Boltshauser / Drees & Sommer GmbH is an architecture practice providing architectural design and project planning for new construction, conversion and renovation projects. The firm’s work includes projects and competitions across residential, education, cultural, administrative and industrial sectors, as well as exhibitions and teaching activities.

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Products & services

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Boltshauser / Drees & Sommer GmbH

✓ Offered3
Architecture services
Design and planning of new-builds, alterations and renovations for residential, educational, cultural, administrative, commercial and health buildings, as well as competition and study assignments.
Competition and study assignments
Participation in project design competitions, study assignments and overall service studies for new-build, conversion and development projects across various use categories.
Urban planning and site development
Urban planning studies, development plans and quarter or site developments for mixed-use, residential, commercial and public buildings.
Trust & reputation

ranQ Trust Score of Boltshauser / Drees & Sommer GmbH: 4.0 out of 5.0

Trust Score4.0/ 5.0

High

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Data basis 100% · As of October 2026

Boltshauser / Drees & Sommer GmbH scores 65.5 out of 100 points in the Reputation area of the ranQ Trust Score. This area carries 42% of the weighting.
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CriterionValueWeight
  • Review quality: The average rating across all connected sources, smoothed against the industry mean. So 5.0 stars from three reviews do not outrank 4.7 from three hundred.65.024%
  • Review volume: The number of reviews across all sources. The scale is logarithmic: the first reviews count the most, and the maximum is reached at 50 reviews.63.210%
  • Review recency: The age of the most recent review. Two-year-old reviews deliberately sit in the middle, because that is normal for Swiss SMEs. Only after three years without a new voice does the value drop markedly.70.08%
Boltshauser / Drees & Sommer GmbH scores 71.5 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.64.612%
  • 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.70.07%
Boltshauser / Drees & Sommer GmbH scores 86.7 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).86.722%
Boltshauser / Drees & Sommer GmbH scores 73.4 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 35.100.04%
  • Media authority: Quality and number of editorial mentions, weighted by the importance of the source, plus the recency of the latest high-quality mention.46.74%
Qualifications+0.00

Boltshauser / Drees & Sommer GmbH reaches a ranQ Trust Score of 4.0 out of 5.0 — rated «High». The rating draws, among other things, on 4.3 out of 5 stars from 11 customer reviews. As of October 2026.

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

Reviews

Aggregated rating

Aggregated rating
4.3
of 5

Aggregated from 11 reviews across all connected sources

Sources
GGoogle4.311
★TrustpilotSoon
PProvenExpertSoon

Further sources are added continuously and factored into the ranQ Rating.

Press

Media

July 16, 2026Media
Kispi-Areal am Zürichberg: 600 Menschen könnten in den umgenutzten Gebäuden wohnen
tagesanzeiger.ch
February 24, 2025Media
Kantonsrat Zürich: Altes Kispi-Areal: Nein zu Wohnsiedlung, ja zu Zwischennutzung
tagesanzeiger.ch
October 18, 2024Media
Kinderspital steht leer: Bald hat der Zürichberg eine 20’000 Quadratmeter Brache – für unbestimmte Zeit
tagesanzeiger.ch

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Location

Dubsstrasse 45
8003 Zurich

At a glance

Legal form
Limited Liability Company
UID
CHE-292.629.939
Founded
2021 · 5 years
Last commercial register change
October 31, 2024
Employees
11 to 20
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.88.06%
  • 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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