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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,701 companies indexed · Last updated: today
DirectoryConstruction & ArchitectureArchitecture FirmsZurichOOS AG
OOS AG Logo
Verified· 4 sourcesTrust Score
Summary

About the company

The company OOS AG is an architectural firm specializing in the planning and realization of buildings, infrastructure projects, and interior architecture. The core activities include: Architecture: planning and realization of new buildings, conversions, renovations, and revitalizations of buildings; Interior architecture: planning and realization of interior spaces, including brand architecture and sustainable solutions; Infrastructure architecture: planning and realization of infrastructure projects, such as logistics centers and transportation structures; Special buildings: planning and realization of special buildings, such as pavilions and exhibition buildings; Sustainable architecture: planning and realization of energy-efficient and sustainable buildings, including zero-energy buildings. The company also offers specialized services such as BIM support, CO2 dashboard, and building management to improve the efficiency and sustainability of buildings.

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Products & services

Industry:Architecture Firms
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OOS AG

✓ Offered7
Architecture
Architecture for residential and working spaces, new builds, conversions and renovations; from strategy and concept through planning to realization and construction management.
Interior Design
Interior design for residential and working spaces, including design development, 3D modelling, virtual reality, materialisation, as well as support through to implementation.
Urban Planning
Urban planning for districts and site developments, with master plans, strategic positioning, feasibility checks and support for project decisions.
Advisory
Advisory on goal definition, needs clarification, framework conditions, sustainability, value engineering, approach, organisation, feasibility and initial cost estimates.
Planning
Planning of tender documents, evaluation of bids and selection of suitable contractors for the realization of construction projects.
Project Delivery
Project delivery with design and technical construction management, cost control, overall coordination, commissioning, documentation and coordination of warranty work.
General Planning
General planning services on request, with interdisciplinary support provided by the design, project management and BIM/VDC team throughout the entire project lifecycle.
Trust & reputation

ranQ Trust Score of OOS AG: 4.2 out of 5.0

Trust Score4.2/ 5.0

Very high

x

Data basis 100% · As of October 2026

OOS AG scores 63.8 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.65.024%
  • 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.49.510%
  • 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.78.08%
OOS AG scores 94.3 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.90.07%
OOS AG scores 86.7 out of 100 points in the Identity area of the ranQ Trust Score. This area carries 22% of the weighting.
x
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%
OOS AG scores 55.0 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 35.100.04%
  • Media authority: Quality and number of editorial mentions, weighted by the importance of the source, plus the recency of the latest high-quality mention.10.04%
Qualifications+0.00

OOS AG reaches a ranQ Trust Score of 4.2 out of 5.0 — rated «Very high». The rating draws, among other things, on 4.3 out of 5 stars from 6 customer reviews. As of October 2026.

The Trust Score cannot be bought and is calculated from publicly verifiable data.

Reviews

Aggregated rating

Aggregated rating
4.3
of 5

Aggregated from 6 reviews across all connected sources

Sources
GGoogle4.36
★TrustpilotSoon
PProvenExpertSoon

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

Press

Media

June 4, 2026Media
Schweizer Pavillon EXPO 2020 OOS
swiss-architects.com
May 28, 2026Media
Office Wüest & Partner OOS
swiss-architects.com
January 25, 2021Media
BIM fürs Labor
espazium.ch
May 18, 2017Media
Expo Dubai: Eine umgekehrte Pyramide für die Schweiz
baublatt.ch

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Location

Hardstrasse 245
8005 Zurich
Opening hours
Mon
09:00 - 18:00
Tue
09:00 - 18:00
Wed
09:00 - 18:00
Thu
09:00 - 18:00
Fri
09:00 - 18:00
Sat
Closed
Sun
Closed

At a glance

Legal form
Corporation
UID
CHE-101.548.212
Founded
2000 · 26 years
Last commercial register change
December 17, 2025
Employees
51 to 100
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.
100.0
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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