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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,629 companies indexed · Last updated: today
DirectoryConstruction & ArchitectureArchitecture FirmsBülacharch5 ag
arch5 ag Logo
Verified· 3 sourcesTrust Score
Summary

About the company

The core activity of arch5 AG is the provision of architectural services, including design, planning and execution of construction projects, with a focus on customer-oriented, contemporary, economic and ecological design.

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Offering

Products & services

Industry:Architecture Firms
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3.9/5

arch5 ag

✓ Offered8
Architectural design
Customer-oriented design, planning and delivery of projects with clear details; architecture for contemporary, economical and ecological buildings.
General designer services
Acting on direct commission from the client as general designer, including coordination and overall responsibility for construction projects.
General contractor services
Acting on direct commission from the client as general contractor for the execution of construction projects.
New builds for single-family homes
Planning and execution of single-family homes, from architectural concept to completion.
New builds for multi-family homes
Planning and execution of multi-family homes with an architectural focus on design, cost efficiency and clear details.
Additions and conversions
Planning and execution of additions and conversions for existing buildings, tailored to individual needs and structural requirements.
Commercial and service buildings
Planning and execution of commercial and service buildings with contemporary, cost-effective and ecological design.
Public buildings
Planning and execution of public buildings with an architectural focus on function, cost efficiency and design.
Trust & reputation

ranQ Trust Score of arch5 ag: 3.9 out of 5.0

Trust Score3.9/ 5.0

High

x

Data basis 96% · As of October 2026

arch5 ag scores 56.5 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.58.124%
  • 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.35.310%
  • 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.78.08%
arch5 ag scores 85.5 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%
arch5 ag scores 85.0 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).85.022%
arch5 ag scores 7.4 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 35.7.44%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

arch5 ag reaches a ranQ Trust Score of 3.9 out of 5.0 — rated «High». The rating draws, among other things, on 3.7 out of 5 stars from 3 customer reviews. The data basis is 96%, 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
3.7
of 5

Aggregated from 3 reviews across all connected sources

Sources
GGoogle3.73
★TrustpilotSoon
PProvenExpertSoon

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

Knowledge

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Comparisons

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Location

Rathausgasse 1
8180 Bülach

At a glance

Legal form
Corporation
UID
CHE-110.579.996
Founded
2004 · 22 years
Last commercial register change
March 7, 2024
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.
100.0
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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