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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint746,904 companies indexed · Last updated: today
DirectoryConstruction & ArchitectureArchitectRiken AgBlum Architektur AG
Blum Architektur AG Logo
Verified· 3 sourcesTrust Score
Summary

About the company

Blum Architektur AG is an architecture firm that plans building projects and develops architectural designs. Its projects include single- and multi-family homes as well as tiny houses, and it also provides property valuations.

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Service area

Offering

Products & services

Industry:Architect
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3.9/5

Blum Architektur AG

5
Architecture and planning services
Individual architectural solutions, planning and construction concepts in close collaboration with clients; economical and ecological implementation, functional facilities with high use value.
Construction and project management
Construction and project management for architectural projects, including direct handling of the mandate and support from planning to implementation.
Tinyhouse planning and realization
Planning and construction of tinyhouses, support with building-law challenges, approvals and realized small-dwelling formats at various locations.
Single-family home projects
Planning and implementation of single-family homes, including various reference properties and builds across multiple locations.
Multi-family building projects
Planning and implementation of multi-family buildings, including reference properties such as MFH Chrüzplatz and other mixed residential developments.
Trust & reputation

ranQ Trust Score of Blum Architektur AG: 3.9 out of 5.0

Trust Score3.9/ 5.0

High

x

Data basis 96% · As of November 2026

Blum Architektur AG scores 53.8 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.70.824%
  • 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.27.910%
  • 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.35.08%
Blum Architektur 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%
Blum Architektur 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%
Blum Architektur AG scores 14.3 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 35.14.34%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Blum Architektur AG reaches a ranQ Trust Score of 3.9 out of 5.0 — rated «High». The rating draws, among other things, on 5.0 out of 5 stars from 2 customer reviews. The data basis is 96%, 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.

Reviews

Aggregated rating

Aggregated rating
5
of 5

Aggregated from 2 reviews across all connected sources

Sources
GGoogle52
★TrustpilotSoon
PProvenExpertSoon

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

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Comparisons

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Location

Roggenstrasse 72
4853 Riken Ag

At a glance

Legal form
Corporation
UID
CHE-114.991.120
Founded
2009 · 17 years
Last commercial register change
July 28, 2022
Employees
1 to 10

Active in 1 of 26 cantons · 1 municipality

  • AGMurgenthal
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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