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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint746,904 companies indexed · Last updated: today
DirectoryConstruction & ArchitectureArchitectMeilenAndreas Ostertag GmbH
Andreas Ostertag GmbH Logo
Verified· 3 sourcesTrust Score
Summary

About the company

The core activity of Andreas Ostertag GmbH is the planning and realization of architectural projects in the field of residential construction, particularly: new constructions of single-family homes (SFH) and multi-family homes (MFH), additions and renovations of existing buildings, interior design and construction, especially of kitchens, bathrooms and apartments. The company also offers services in the field of interior design for offices and practices.

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Products & services

Industry:Architect
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3.8/5

Andreas Ostertag GmbH

✓ Offered3
Architecture for new builds (EFH & MFH)
Architecture for new builds of single-family homes, multi-family homes, residential developments, and residential and commercial buildings.
Extensions and conversions
Extensions and conversions, renovations and vertical additions of residential buildings, including terrace apartments, single-family homes and apartments.
Interior fit-out & design
Interior fit-out for offices, surgeries and apartments, with a focus on kitchens, bathrooms, entrance areas and the redesign of living spaces.
Trust & reputation

ranQ Trust Score of Andreas Ostertag GmbH: 3.8 out of 5.0

Trust Score3.8/ 5.0

High

x

Data basis 96% · As of November 2026

Andreas Ostertag GmbH 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%
Andreas Ostertag 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%
Andreas Ostertag GmbH 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%
Andreas Ostertag GmbH scores 2.6 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 35.2.64%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Andreas Ostertag GmbH 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

Dorfstrasse 36
8706 Meilen

At a glance

Legal form
Limited Liability Company
UID
CHE-110.350.442
Founded
2003 · 23 years
Last commercial register change
June 15, 2009
Employees
1 to 10

Active in 1 of 26 cantons · 1 municipality

  • ZHMeilen
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.
88.0
6%
  • 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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