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DirectoryConstruction & ArchitectureArchitectLiestalSiegenthaler + Partner Architektur AG
Siegenthaler + Partner Architektur AG Logo
Verified· 3 sourcesTrust Score
Summary

About the company

Siegenthaler + Partner Architektur AG is an architectural firm providing planning, consulting and construction services. Offerings include project analyses and feasibility studies, design and construction documentation, construction supervision, project and building management, delivery as general or total contractor, property administration and sales, and building valuations.

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Products & services

Industry:ArchitectGeneral contractor
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Siegenthaler + Partner Architektur AG

✓ Offered10
Architectural planning
Individual planning and consulting across all service phases related to the construction project, from the first idea sketch to completion of the building.
Project analyses and feasibility studies
Project analyses and feasibility studies for construction projects as part of the offered areas of activity and services.
Detailed design
Detailed design for construction projects, coordinated with aesthetic, functional and economic requirements.
Construction site supervision
Construction site supervision and support of the execution until completion of the building.
Project and construction management
Project and construction management for construction projects, including planning, coordination and control of implementation.
General contractor
Building execution as a general contractor for the implementation of construction projects.
Total contractor
Project implementation as a total contractor for the complete execution of construction projects.
Property management and sales
Management and sale of properties, along with current offers for sale and rental.
Building valuations
Building valuations as an independent service in connection with construction and real estate projects.
Competitions
Participation in and preparation of competitions in an architectural context.
Trust & reputation

ranQ Trust Score of Siegenthaler + Partner Architektur AG: 3.8 out of 5.0

Trust Score3.8/ 5.0

High

x

Data basis 96% · As of November 2026

Siegenthaler + Partner Architektur 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%
Siegenthaler + Partner 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%
Siegenthaler + Partner Architektur AG scores 86.7 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).86.722%
Siegenthaler + Partner Architektur AG scores 0.0 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 35.0.04%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Siegenthaler + Partner Architektur AG reaches a ranQ Trust Score of 3.8 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

Fraumattstrasse 30
4410 Liestal

At a glance

Legal form
Corporation
UID
CHE-108.262.834
Founded
1995 · 31 years
Last commercial register change
March 19, 2024
Employees
1 to 10

Active in 1 of 26 cantons · 1 municipality

  • BLLiestal
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.100.06%
  • 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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