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

About the company

Castellani Architektur is an architecture practice that plans new buildings, renovations and extensions. Its work also includes expert assessments and inventories, scenography, studies and competitions.

AI-generated
Presence

Service area

Offering

Products & services

Industry:Architect
✓ Offered4
Architectural planning
New builds, conversions and extensions focusing on architecture, economics, design and sustainability while observing cost and schedule requirements.
Expert reports and inventories
Expert opinions on protectability, inventories of protected sites and building inventories, including at municipal and cantonal level.
Scenography
Scenographic projects and exhibition spaces, for example historical traces, document rooms and culture-related staging.
Studies and competitions
Project studies, feasibility studies, condition analyses and competition entries for new-build, conversion and renovation assignments.
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3.7/5

Castellani Architektur

Trust & reputation

ranQ Trust Score of Castellani Architektur: 3.7 out of 5.0

Trust Score3.7/ 5.0

Solid

x

Data basis 96% · As of November 2026

Castellani Architektur scores 49.8 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.68.224%
  • 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.17.610%
  • 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%
Castellani Architektur scores 71.2 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.83.012%
  • 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%
Castellani Architektur scores 86.7 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).86.722%
Castellani Architektur scores 2.0 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 35.2.04%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Castellani Architektur reaches a ranQ Trust Score of 3.7 out of 5.0 — rated «Solid». The rating draws, among other things, on 5.0 out of 5 stars from 1 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 1 reviews across all connected sources

Sources
GGoogle51
★TrustpilotSoon
PProvenExpertSoon

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

Knowledge

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Comparisons

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Location

Rain 15
5000 Aarau
Opening hours
Mon
08:00 - 12:00, 13:00 - 18:00
Tue
08:00 - 12:00, 13:00 - 18:00
Wed
08:00 - 12:00, 13:00 - 18:00
Thu
08:00 - 12:00, 13:00 - 18:00
Fri
08:00 - 12:00, 13:00 - 18:00
Sat
Closed
Sun
Closed

At a glance

Legal form
Sole proprietorship
UID
CHE-421.723.371
Founded
2017 · 9 years
Last commercial register change
December 20, 2018
Employees
1 to 10

Active in 1 of 26 cantons · 1 municipality

  • AGAarau
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.
67.0
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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