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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,765 companies indexed · Last updated: today
DirectoryReal EstateReal Estate Project DevelopmentGrabenconcept21 AG
concept21 AG Logo
Verified· 3 sourcesTrust Score
Summary

About the company

The company Concept 21 AG primarily focuses on the planning and realization of construction projects, particularly in the residential building sector. The core activities include: Comprehensive planning from financing to color and material selection, architecture and building planning, construction and project management, cost planning and cost control, consulting on the financing of construction projects, and the implementation of construction projects with consideration for sustainability and energy efficiency. Thus, the company offers a comprehensive range of services in the residential building sector, from planning to realization.

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Products & services

Industry:Real Estate Project Development
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concept21 AG

✓ Offered4
Planning
Functionality, work processes, barrier-free construction, integration into the surroundings, daylighting/shading, controlled apartment ventilation and energy requirements.
Realisation
Delivery of construction projects with synergies, partnerships, proven procedures and an open approach to new technologies for quality and on-time implementation.
Financing
Preparation of detailed financing dossiers for construction financing as well as support during bank appointments and coordination with banks and insurers.
Colour concept
Individual colour-concept analysis to select suitable colours for living spaces, tailored to colour perception, materials and room impact.
Trust & reputation

ranQ Trust Score of concept21 AG: 4.1 out of 5.0

Trust Score4.1/ 5.0

High

x

Data basis 96% · As of October 2026

concept21 AG scores 66.6 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.67.224%
  • 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.55.910%
  • 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%
concept21 AG scores 85.5 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%
concept21 AG scores 85.0 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).85.022%
concept21 AG scores 17.1 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 35.17.14%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

concept21 AG reaches a ranQ Trust Score of 4.1 out of 5.0 — rated «High». The rating draws, among other things, on 4.4 out of 5 stars from 8 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
4.4
of 5

Aggregated from 8 reviews across all connected sources

Sources
GGoogle4.48
★TrustpilotSoon
PProvenExpertSoon

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

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Location

Burach 72
3376 Graben

At a glance

Legal form
Corporation
UID
CHE-115.799.588
Founded
2010 · 16 years
Last commercial register change
January 13, 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.
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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