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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,701 companies indexed · Last updated: today
DirectoryConstruction & ArchitectureArchitecture FirmsHellsauZumast AG
Zumast AG Logo
Verified· 3 sourcesTrust Score
Summary

About the company

The core activity of ZUMAST AG is the provision of services in the field of architecture and construction planning, including design, planning, construction management and realization of construction projects, in particular for single-family homes, renovations and agricultural buildings.

AI-generated
Offering

Products & services

Industry:Architecture Firms
✓ Offered6
Real estate project development
Project development for extensions and conversions, new residential buildings, public buildings as well as industrial and agricultural buildings; land development and site servicing.
Architecture and construction planning
Architecture, design and construction planning with spatial concepts, indoor and outdoor spatial relationships, taking into account location, shading and sunlight exposure, as well as cost-effective construction and detailing solutions.
Cost calculation and estimation
Cost estimation, cost calculation and post-calculation during the architecture and planning phase as well as throughout implementation, for a binding cost overview.
Construction implementation
Guidance from the building permit application to acceptance, including contract award, works contracts, invoicing, cost monitoring and coordination of schedules.
Detail planning
Preparation of execution drawings based on the design using digital planning tools for binding and precise execution documents.
Construction site management
Site setup and coordination of the trades to implement the construction planning with quality assurance and adherence to the agreed dates.
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4.0/5

Zumast AG

Trust & reputation

ranQ Trust Score of Zumast AG: 4.0 out of 5.0

Trust Score4.0/ 5.0

High

x

Data basis 96% · As of October 2026

Zumast AG scores 58.1 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.66.724%
  • 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.27.910%
  • 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.70.08%
Zumast 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%
Zumast 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%
Zumast AG scores 1.1 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 35.1.14%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Zumast AG reaches a ranQ Trust Score of 4.0 out of 5.0 — rated «High». The rating draws, among other things, on 4.5 out of 5 stars from 2 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
4.5
of 5

Aggregated from 2 reviews across all connected sources

Sources
GGoogle4.52
★TrustpilotSoon
PProvenExpertSoon

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

Knowledge

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Comparisons

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Location

Zürich-Bernstrasse 22a
3429 Hellsau

At a glance

Legal form
Corporation
UID
CHE-107.900.879
Founded
1975 · 51 years
Last commercial register change
February 28, 2022
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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