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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,887 companies indexed · Last updated: today
DirectoryConstruction & ArchitectureArchitecture FirmsWindischHartmann Keller Architekten, Inhaber Christian Hartmann
Hartmann Keller Architekten, Inhaber Christian Hartmann Logo
Verified· 3 sourcesTrust Score
Summary

About the company

Hartmann Keller Architekten, Inhaber Christian Hartmann is an architectural firm. The firm provides project development, project and execution planning including construction management, and carries out new-builds, conversions and renovations; it also takes over external projects for continuation or support.

AI-generated
Offering

Products & services

Industry:Architecture Firms
✓ Offered3
Project development, project and execution planning including site management
Project development and project and execution planning including site management for construction projects in the Brugg, Baden, Aarau and Fricktal region.
New builds, conversions and renovations
New builds, conversions and renovations, as well as structures with challenging conditions.
Taking over third-party projects for continuation or support
Taking over third-party projects for continuation or support when projects were started externally and need to be continued architecturally.
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3.7/5

Hartmann Keller Architekten, Inhaber Christian Hartmann

Trust & reputation

ranQ Trust Score of Hartmann Keller Architekten, Inhaber Christian Hartmann: 3.7 out of 5.0

Trust Score3.7/ 5.0

Solid

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Data basis 96% · As of October 2026

Hartmann Keller Architekten, Inhaber Christian Hartmann scores 46.6 out of 100 points in the Reputation area of the ranQ Trust Score. This area carries 42% of the weighting.
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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.58.324%
  • 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.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%
Hartmann Keller Architekten, Inhaber Christian Hartmann scores 73.3 out of 100 points in the Substance area of the ranQ Trust Score. This area carries 28% of the weighting.
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CriterionValueWeight
  • Establishment: Years since founding or brand launch, logarithmic. The maximum is reached at 15 years.79.212%
  • 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%
Hartmann Keller Architekten, Inhaber Christian Hartmann 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%
Hartmann Keller Architekten, Inhaber Christian Hartmann scores 28.6 out of 100 points in the Visibility area of the ranQ Trust Score. This area carries 8% of the weighting.
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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 35.28.64%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Hartmann Keller Architekten, Inhaber Christian Hartmann reaches a ranQ Trust Score of 3.7 out of 5.0 — rated «Solid». The rating draws, among other things, on 3.5 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 October 2026.

The Trust Score cannot be bought and is calculated from publicly verifiable data.

Reviews

Aggregated rating

Aggregated rating
3.5
of 5

Aggregated from 2 reviews across all connected sources

Sources
GGoogle3.52
★TrustpilotSoon
PProvenExpertSoon

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

Knowledge

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Comparisons

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Location

Dohlenzelgstrasse 39
5210 Windisch
Opening hours
Mon
08:00 - 12:00, 13:00 - 17:00
Tue
08:00 - 12:00, 13:00 - 17:00
Wed
08:00 - 12:00, 13:00 - 17:00
Thu
08:00 - 12:00, 13:00 - 17:00
Fri
08:00 - 12:00, 13:00 - 16:00
Sat
Closed
Sun
Closed

At a glance

Legal form
Sole proprietorship
UID
CHE-256.542.171
Founded
2018 · 8 years
Last commercial register change
December 27, 2018
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.67.06%
  • 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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