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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,887 companies indexed · Last updated: today
DirectoryConstruction & ArchitectureBuilding ConstructionSchönenberg An Der ThurHagen Bau GmbH
Hagen Bau GmbH Logo
Verified· 3 sourcesTrust Score
Summary

About the company

The core activity of Hagen Bau GmbH includes masonry work, conversions, renovations, consulting, planning, execution and construction management in the areas of: excavation and sewerage work, foundations and floor slabs, extensions and conversions of garages to single-family homes, composite stone surfaces and paths, various customer work such as repairs and patchwork, insulation and plastering, core drilling in concrete walls and injections in damp cellar walls.

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Products & services

Industry:Building ConstructionCivil Engineering
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3.8/5

Hagen Bau GmbH

Site Preparation
✓ Offered10
Masonry work
Masonry work for new builds, conversions and renovations; consulting, design, execution and site management for construction projects.
Conversions and extensions
Conversions and extensions, including alterations to existing buildings as well as extensions and underpinning.
Renovations
Renovations of buildings, including repairs, patchwork work and work on damp cellar walls.
Consulting, planning and site management
Consulting and planning as well as execution and site management for construction projects, from the first meeting to implementation.
Excavation work and sewer systems
Excavation work and sewer systems for construction projects, including preparation of building pits and site connection works.
Foundations and floor slabs
Foundations and floor slabs for new builds, garages and single-family houses.
New builds
New builds from garages to single-family houses, including load-bearing construction work and structural execution.
Interlocking paving patios and pathways
Interlocking paving patios and paths, including paving stones for sidewalks and paved outdoor areas.
Insulating and plastering
Insulating and plastering for buildings, with work on walls and surfaces in both indoor and outdoor areas.
Core drilling and injections
Core drilling in concrete walls as well as injections into damp cellar walls for structural refurbishment.
Trust & reputation

ranQ Trust Score of Hagen Bau GmbH: 3.8 out of 5.0

Trust Score3.8/ 5.0

High

x

Data basis 96% · As of October 2026

Hagen Bau GmbH scores 47.2 out of 100 points in the Reputation area of the ranQ Trust Score. This area carries 42% of the weighting.
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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.63.624%
  • 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%
Hagen Bau 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%
Hagen 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.
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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).85.022%
Hagen Bau GmbH scores 4.6 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 35.4.64%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Hagen Bau GmbH reaches a ranQ Trust Score of 3.8 out of 5.0 — rated «High». The rating draws, among other things, on 4.0 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 October 2026.

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

Reviews

Aggregated rating

Aggregated rating
4
of 5

Aggregated from 1 reviews across all connected sources

Sources
GGoogle41
★TrustpilotSoon
PProvenExpertSoon

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

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Location

Mitteldorfstrasse 6
9215 Schönenberg An Der Thur

At a glance

Legal form
Limited Liability Company
UID
CHE-109.563.385
Founded
2002 · 24 years
Last commercial register change
February 26, 2020
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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