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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint746,904 companies indexed · Last updated: today
DirectoryConstruction & ArchitectureBuilding contractorEriswilSchwarz Bau GmbH
Schwarz Bau GmbH Logo
Verified· 3 sourcesTrust Score
Summary

About the company

Schwarz Bau GmbH is a construction company working in road and civil engineering, building construction, earthworks and site works. Its services include demolition, natural stone walls, spring capture, forest road construction, and the rental and servicing of construction machinery.

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Service area

Offering

Products & services

Industry:Building contractorExcavation
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4.0/5

Schwarz Bau GmbH

✓ Offered9
Road construction and civil engineering
New developments, road rehabilitation work and forecourts; water channels, granite edge restraints, lane slabs made of concrete, asphalt and concrete paving stones.
Building construction
Retaining walls, basement walls and floor slabs; support from planning and building submission through to execution with partner firms.
Spring capture, retention, stream bank protection and re-cultivation
Renewal and renovation of spring capture structures, well chambers and reservoirs; rainwater tanks, stream bank protection and re-cultivation.
Demolition and house clearance
Professional dismantling and demolition, clearing out, preparation of the property for re-use, and organisation of asbestos remediation plus disposal/recycling.
Excavator and machinery rental
Rental of mini excavators, excavators, dumpers, Ramax and other machines; advice and support when selecting equipment.
Natural stone walls
Natural stone walls made of Formwild and rectangular block stones for overcoming height differences, creating habitats for insects and small creatures.
Core drilling and underboring with Erdrakete
Core drilling up to 300 mm diameter, and pipe installation under roads or forecourts with an Erdrakete or steel pipe jacking up to 200 mm.
Construction and maintenance of natural and forest roads
Planning, construction and maintenance of natural and forest roads; profiling, new wearing courses made of marl or Planie gravel and work with a road paver.
Construction machinery service
Maintenance, repairs, servicing and diagnostic work on construction machinery, as well as hydraulic hose service up to 5/8 inch.
Trust & reputation

ranQ Trust Score of Schwarz Bau GmbH: 4.0 out of 5.0

Trust Score4.0/ 5.0

High

x

Data basis 96% · As of November 2026

Schwarz Bau GmbH scores 64.2 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.70.024%
  • 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.45.610%
  • 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.70.08%
Schwarz 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%
Schwarz 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%
Schwarz Bau GmbH scores 11.4 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 35.11.44%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Schwarz Bau GmbH reaches a ranQ Trust Score of 4.0 out of 5.0 — rated «High». The rating draws, among other things, on 4.6 out of 5 stars from 5 customer reviews. The data basis is 96%, so the score is backed by part of the criteria. As of November 2026.

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

Reviews

Aggregated rating

Aggregated rating
4.6
of 5

Aggregated from 5 reviews across all connected sources

Sources
GGoogle4.65
★TrustpilotSoon
PProvenExpertSoon

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

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Location

Ahornstrasse 37
4952 Eriswil

At a glance

Legal form
Limited Liability Company
UID
CHE-113.504.055
Founded
2007 · 19 years
Last commercial register change
November 28, 2022
Employees
1 to 10

Active in 1 of 26 cantons · 1 municipality

  • BEEriswil
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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