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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint747,212 companies indexed · Last updated: today
DirectoryConstruction & ArchitectureArchitectAppenzellKoller Koster AG
Koller Koster AG Logo
Verified· 3 sourcesTrust Score
Summary

About the company

Koller Koster AG is an architecture practice working on projects for housing, workplaces, culture and infrastructure. Its work includes new buildings, renovations, heritage conservation, interior spaces and public spaces.

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Service area

Offering

Products & services

Industry:Architect
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3.9/5

Koller Koster AG

9
Architecture
Architecture for residential, work and cultural buildings; new-build, renovation, interiors, districts and studies, complemented by cost planning and construction realisation with external specialists.
New build
New-build projects for residential and work buildings; examples include Ennetbaden, Haus Gmünder, Hintere Wühre and Saurer Werk 2.
Renovation
Renovation projects for residential, work and cultural buildings; including Altes Pfarrhaus, Gassner, Goba, Haus Weymann, KB Oberegg and Klosterkirche Wonnenstein.
Heritage conservation
Heritage conservation for historic buildings and facilities; examples include Altes Pfarrhaus, Fischereizucht Wangen, Haus Weymann, Klosterkirche Wonnenstein, Haus Steubles and Zeughaus Trogen.
Interiors
Interior design and interior fit-out for projects such as Cocon Dessous, KB Oberegg and Zeughaus Trogen.
Residential construction
Residential construction projects and homes, including Altes Pfarrhaus, Boges Hampi, Ennetbaden, Haus Gmünder, Haus Weymann and Saurer Werk 2.
Commercial construction
Planning of work and commercial buildings; examples include Cocon Dessous, Fischereizucht Wangen, Goba, KB Oberegg, Saurer Werk 2 and Zeughaus Trogen.
Cultural architecture
Architecture for cultural buildings, such as Klosterkirche Wonnenstein.
District
District-related architecture and urban planning studies, including Speicherschwendi.
Trust & reputation

ranQ Trust Score of Koller Koster AG: 3.9 out of 5.0

Trust Score3.9/ 5.0

High

x

Data basis 96% · As of November 2026

Koller Koster AG 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%
Koller Koster AG scores 89.3 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.70.07%
Koller Koster AG 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%
Koller Koster AG scores 6.6 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 35.6.64%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Koller Koster 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 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.

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Location

Hoferbad 12
9050 Appenzell
Opening hours
Mon
08:30 - 17:30
Tue
08:30 - 17:30
Wed
08:30 - 17:30
Thu
08:30 - 17:30
Fri
08:30 - 17:30
Sat
Closed
Sun
Closed

At a glance

Legal form
Corporation
UID
CHE-112.889.752
Founded
2006 · 20 years
Last commercial register change
October 8, 2010
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.
100.0
6%
  • Branch offices: Branch offices linked in the commercial register. Having none is normal and costs no points.70.03%
    • Full methodology

    Active in 2 of 26 cantons · 2 municipalities

    • AIAppenzell
    • ZHZurich

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