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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,629 companies indexed · Last updated: today
DirectoryConstruction & ArchitectureBuilding ConstructionOberengstringenSiegfried Bau AG
Siegfried Bau AG Logo
Verified· 2 sourcesTrust Score
Summary

About the company

The company "siegfried bau ag" is a construction company specializing in the planning and execution of construction projects. The core activity of the company is the provision of construction services, including construction management, construction supervision and client work.

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Offering

Products & services

Industry:Building ConstructionBuilding Maintenance
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Siegfried Bau AG

✓ Offered4
Conversions & new builds
Conversions, attic storey add-ons, living space extensions, garages and parking spaces, lift installations, balcony extensions and replacement buildings from single-family homes to multi-family homes.
Renovations & refurbishments
Renovations and refurbishments, in particular pipe riser refurbishments in older buildings as well as kitchen and bathroom refurbishments for owners, property managers and rental apartments.
Client masonry work
Client masonry work for façades, garden walls, partition walls, slab coverings, slopes and forecourts; including advice, execution and coordination of further works.
Services in the construction trades
General services in the construction trades, complemented by customer-oriented execution and coordination of construction work via the company’s own network.
Trust & reputation

ranQ Trust Score of Siegfried Bau AG: 4.1 out of 5.0

Trust Score4.1/ 5.0

High

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Data basis 54% · As of October 2026

Without public customer reviews the score stays capped.

Siegfried Bau AG has no value in the Reputation area of the ranQ Trust Score because no data is available. The area carries 42% of the weighting and drops out of the calculation for this profile; it does not lower the score, only the reported data basis.
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CriterionValueWeight
  • Review quality: No data point — the criterion is taken out of the weighting and does not lower the score.—24%
  • Review volume: No data point — the criterion is taken out of the weighting and does not lower the score.—10%
  • Review recency: No data point — the criterion is taken out of the weighting and does not lower the score.—8%
Siegfried Bau AG scores 89.3 out of 100 points in the Substance area of the ranQ Trust Score. This area carries 28% of the weighting.
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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.70.07%
Siegfried Bau AG scores 83.3 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).83.322%
Siegfried Bau AG scores 8.9 out of 100 points in the Visibility area of the ranQ Trust Score. This area carries 8% of the weighting.
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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 35.8.94%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Siegfried Bau AG reaches a ranQ Trust Score of 4.1 out of 5.0 — rated «High». No public customer reviews are available for this provider; the rating is based on the remaining criteria. The data basis is 54%, 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.

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Location

Dorfstrasse 6
8102 Oberengstringen

At a glance

Legal form
Corporation
UID
CHE-108.635.728
Founded
1997 · 29 years
Last commercial register change
July 1, 2024
Employees
11 to 20
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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