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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,887 companies indexed · Last updated: today
DirectoryConstruction & ArchitectureGeneral ContractorsSt. GallenMarkus Alder, Architekten GmbH
Markus Alder, Architekten GmbH Logo
Verified· 2 sourcesTrust Score
Summary

About the company

The core activity of Markus Alder Architektur is the provision of architectural services, particularly in the field of age-appropriate building.

AI-generated
Offering

Products & services

Industry:General Contractors
✓ Offered6
Architectural planning
Planning for new builds and renovations, residential properties, multi-family houses, and public buildings; design development, detailed construction planning, and support for building projects.
Renovation and renewal
Conversion, refurbishment, renewal, and energy-efficient upgrading of residential houses, properties, attic floors, and existing buildings.
New construction
New construction of single-family houses, multi-family houses, residential developments, and individual extensions or replacement builds.
Additions and storey additions
Additions, roof conversions, balcony extensions, terrace additions, and storey additions for residential and commercial properties.
Heritage conservation and historic buildings
Renewal and refurbishment of listed heritage buildings, old town houses, and historic structures.
Consulting for age-friendly building
Specialist advice for age-friendly building, membership in the ARTISET network; reference to assisted living and cooperative housing for the second half of life.
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4.1/5

Markus Alder, Architekten GmbH

Trust & reputation

ranQ Trust Score of Markus Alder, Architekten GmbH: 4.1 out of 5.0

Trust Score4.1/ 5.0

High

x

Data basis 54% · As of October 2026

Without public customer reviews the score stays capped.

Markus Alder, 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%
Markus Alder, 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.
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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%
Markus Alder, 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%
Markus Alder, Architekten GmbH scores 57.1 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 35.57.14%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Markus Alder, 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

Lindenstrasse 122
9000 St. Gallen

At a glance

Legal form
Limited Liability Company
UID
CHE-109.438.544
Founded
2002 · 24 years
Last commercial register change
August 6, 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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