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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,765 companies indexed · Last updated: today
DirectoryConstruction & ArchitectureArchitecture FirmsWinterthurarch+bau GmbH
arch+bau GmbH Logo
Verified· 3 sourcesTrust Score
Summary

About the company

The core activity of arch+bau GmbH is the provision of architectural services, particularly in the areas of new buildings, renovations, conversions and extensions. The company offers consulting, planning and implementation of construction projects and positions itself as a specialist for these services.

AI-generated
Offering

Products & services

Industry:Architecture FirmsReal Estate Project Development
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3.8/5

arch+bau GmbH

✓ Offered5
Architecture
Feasibility studies, design, planning and execution for extensions, new builds, renovations and partial renovations.
Property owner advisory
Independent assessments, time relief and support with legal, financial, structural and usage-optimised tasks for property owners.
Area and project development
Area and project development for construction projects, complemented by real estate management and property management with partners.
Visualisations
Architectural visualisations to present projects and designs in image form.
Sale of properties
Properties for sale, including new-build apartments in Oerlingen.
Trust & reputation

ranQ Trust Score of arch+bau GmbH: 3.8 out of 5.0

Trust Score3.8/ 5.0

High

x

Data basis 88% · As of October 2026

arch+bau GmbH scores 51.0 out of 100 points in the Reputation area of the ranQ Trust Score. This area carries 42% of the weighting.
x
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.53.324%
  • 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.45.610%
  • Review recency: No data point — the criterion is taken out of the weighting and does not lower the score.—8%
arch+bau GmbH scores 79.8 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.92.512%
  • 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%
arch+bau GmbH 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%
arch+bau GmbH scores 0.9 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 35.0.94%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

arch+bau GmbH reaches a ranQ Trust Score of 3.8 out of 5.0 — rated «High». The rating draws, among other things, on 3.6 out of 5 stars from 5 customer reviews. The data basis is 88%, 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.

Reviews

Aggregated rating

Aggregated rating
3.6
of 5

Aggregated from 5 reviews across all connected sources

Sources
GGoogle3.65
★TrustpilotSoon
PProvenExpertSoon

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

Knowledge

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Location

Hermannstrasse 8
8400 Winterthur
Opening hours
Mon
07:30 - 17:30
Tue
07:30 - 17:30
Wed
07:30 - 17:30
Thu
07:30 - 17:30
Fri
07:30 - 17:30
Sat
Closed
Sun
Closed

At a glance

Legal form
Limited Liability Company
UID
CHE-148.860.131
Founded
2014 · 12 years
Last commercial register change
June 8, 2022
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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