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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,937 companies indexed · Last updated: today
DirectoryConstruction & ArchitectureArchitecture FirmsSolothurnEng Portmann Partner Dipl. Architekten GmbH
Eng Portmann Partner Dipl. Architekten GmbH Logo
Verified· 3 sourcesTrust Score
Summary

About the company

Eng Portmann Partner Dipl. Architekten GmbH is an architectural practice offering strategic planning, feasibility studies, design/project planning, tendering, construction realization and facility management. The firm advises clients on building-related matters and focuses on human-centred, cost-aware solutions.

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Products & services

Industry:Architecture Firms
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3.9/5

Eng Portmann Partner Dipl. Architekten GmbH

5
Residential building architecture
Residential buildings, conversions and renovations of single-family houses, multi-family houses and old-town properties; also extensions, changes of use and new builds.
Architecture for service buildings
Service buildings, changes of use, conversions and renovations for banks, healthcare and gastronomy businesses, as well as project support.
Architecture for commercial buildings
Commercial buildings, new builds, extensions, as well as feasibility studies and building submissions for industrial and automobile businesses.
Architecture for public buildings
Public buildings, annexes, extensions and renovations for schools, libraries, churches, care and educational facilities.
Competition management
Participation in invited competitions, preliminary projects and competition entries for construction projects; individual work with rankings.
Trust & reputation

ranQ Trust Score of Eng Portmann Partner Dipl. Architekten GmbH: 3.9 out of 5.0

Trust Score3.9/ 5.0

High

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Data basis 96% · As of October 2026

Eng Portmann Partner Dipl. Architekten GmbH scores 59.7 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.73.124%
  • 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.35.310%
  • 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.50.08%
Eng Portmann Partner Dipl. Architekten GmbH scores 79.8 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.92.512%
  • 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%
Eng Portmann Partner Dipl. Architekten GmbH 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%
Eng Portmann Partner Dipl. Architekten GmbH scores 5.4 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 35.5.44%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Eng Portmann Partner Dipl. Architekten GmbH 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 3 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
5
of 5

Aggregated from 3 reviews across all connected sources

Sources
GGoogle53
★TrustpilotSoon
PProvenExpertSoon

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

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Location

Hauptgasse 4
4500 Solothurn

At a glance

Legal form
Limited Liability Company
UID
CHE-313.745.039
Founded
2014 · 12 years
Last commercial register change
February 4, 2026
Employees
1 to 10
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.88.06%
  • Branch offices: Branch offices linked in the commercial register. Having none is normal and costs no points.70.03%
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