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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,629 companies indexed · Last updated: today
DirectoryConstruction & ArchitectureBuilding ConstructionZurichDuffy Bau GmbH
Duffy Bau GmbH Logo
Verified· 3 sourcesTrust Score
Summary

About the company

The company provides digital services and assets (such as websites and applications) and collects user data to operate, develop and improve these services. It is a company specialized in providing digital content and services, including personalized advertising and analysis of user behavior.

AI-generated
Offering

Products & services

Industry:Building ConstructionBuilding Maintenance
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4.2/5

Duffy Bau GmbH

Owner's Representative
Site Preparation
Painting & Plastering
✓ Offered8
Remodelling and Renovation
Remodelling and renovation of houses, bathrooms and kitchens, plus extensions, garages, conservatories and attic conversions.
Tile Work
Tile work in new builds, conversions and refurbishments, with advice and workmanship for residential developments, living spaces and bathrooms.
Construction Support
Construction support with quality control, site supervision, advice for house purchase and house building, plus review of building specifications, contracts and quotations.
Building Surveying
Building surveying for assessing structures, analysing damage causes and providing independent evaluations for new builds, conversions and refurbishments.
Core Drilling
Precision core drilling for openings in concrete, masonry and artificial stone.
Structural Waterproofing
Structural waterproofing for basements, roofs, underground garages and bridges on concrete, plaster, gypsum and wood.
Demolition Works
Demolition works for small dismantling jobs and major demolition in building, civil engineering and road construction.
Plastering Work
Plastering work inside and outside for walls, ceilings and façades, including insulation, dry construction, fire protection and base, levelling and finish coats.
Trust & reputation

ranQ Trust Score of Duffy Bau GmbH: 4.2 out of 5.0

Trust Score4.2/ 5.0

Very high

x

Data basis 96% · As of October 2026

Duffy Bau GmbH scores 78.4 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.84.124%
  • 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.65.210%
  • 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%
Duffy Bau GmbH scores 74.1 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.79.212%
  • 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%
Duffy Bau GmbH 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%
Duffy Bau GmbH scores 37.1 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 35.37.14%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Duffy Bau GmbH reaches a ranQ Trust Score of 4.2 out of 5.0 — rated «Very high». The rating draws, among other things, on 5.0 out of 5 stars from 12 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
5
of 5

Aggregated from 12 reviews across all connected sources

Sources
GGoogle512
★TrustpilotSoon
PProvenExpertSoon

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

Knowledge

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Comparisons

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Location

Zelgwiesenstrasse 15
8046 Zurich
Opening hours
Mon
07:00 - 18:00
Tue
07:00 - 18:00
Wed
07:00 - 18:00
Thu
07:00 - 18:00
Fri
07:00 - 17:00
Sat
Closed
Sun
Closed

At a glance

Legal form
Limited Liability Company
UID
CHE-397.481.171
Founded
2018 · 8 years
Last commercial register change
June 8, 2018
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.
88.0
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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