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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,887 companies indexed · Last updated: today
DirectoryConstruction & ArchitectureArchitecture FirmsRapperswil SgKeller + Loser Architekten GmbH
Keller + Loser Architekten GmbH Logo
Verified· 2 sourcesTrust Score
Summary

About the company

The core activity of Keller + Loser Architekten is the planning, development and realization of architectural projects, particularly in the areas of new buildings, renovations and residential solutions. The company offers comprehensive services, including consulting, planning, design and project management, to develop individual and innovative solutions for its clients.

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Products & services

Industry:Architecture Firms
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Keller + Loser Architekten GmbH

Architectural services
Feasibility studies, concept design, building permit submissions, construction planning, detailed planning and site management for building projects; complemented by consulting, design, aesthetics and construction.
New-build planning
New builds for single-family homes, multi-family houses and larger developments; from the first idea and sketch to handover of the keys, and as a point of contact after construction.
Renovation planning
Conversions, renovations and change of use of existing buildings, including clarification of building-law requirements, protection of the townscape, heritage protection and zoning planning.
CAD services for architecture
CAD services for individual projects or part-time assignments, straightforward and reliable, as support when capacity is tight in everyday architectural work.
Trust & reputation

ranQ Trust Score of Keller + Loser Architekten GmbH: 4.1 out of 5.0

Trust Score4.1/ 5.0

High

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Data basis 54% · As of October 2026

Without public customer reviews the score stays capped.

Keller + Loser Architekten GmbH has no value in the Reputation area of the ranQ Trust Score because no data is available. The area carries 42% of the weighting and drops out of the calculation for this profile; it does not lower the score, only the reported data basis.
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CriterionValueWeight
  • Review quality: No data point — the criterion is taken out of the weighting and does not lower the score.—24%
  • Review volume: No data point — the criterion is taken out of the weighting and does not lower the score.—10%
  • Review recency: No data point — the criterion is taken out of the weighting and does not lower the score.—8%
Keller + Loser Architekten GmbH scores 83.0 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%
Keller + Loser Architekten GmbH scores 83.3 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).83.322%
Keller + Loser Architekten GmbH scores 2.9 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 35.2.94%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Keller + Loser Architekten GmbH reaches a ranQ Trust Score of 4.1 out of 5.0 — rated «High». No public customer reviews are available for this provider; the rating is based on the remaining criteria. The data basis is 54%, 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.

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Location

Hauptplatz 5
8640 Rapperswil Sg

At a glance

Legal form
Limited Liability Company
UID
CHE-385.031.789
Founded
2011 · 15 years
Last commercial register change
August 19, 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%
    • Full methodology

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