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

About the company

The core activity of Birrer Bau AG is construction, including specific services such as exposed concrete construction, agricultural buildings, swimming pool construction and construction services.

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Offering

Products & services

Industry:Building ConstructionBuilding MaintenanceCivil Engineering
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Birrer Bau AG

✓ Offered6
Building construction
Building construction for villas, single-family homes and multi-family houses; solutions developed together with the client and architects, tailored to needs and complex construction projects.
Civil engineering
Sewerage systems, pipeline construction, excavation of building pits and shoring of excavations, piling and anchoring, finishing and backfilling works, site works.
Construction services
Alterations, renovations, refurbishments, work on residential buildings and public buildings, smaller fixes as well as repair and beautification work inside the home.
Swimming pools
Pool construction with overflow channel (infinity pool); planning and execution of swimming pools according to customer needs and developments, including consultation.
Exposed concrete
Planning and implementation of exposed-concrete construction with different shuttering types, surface structures and color finishes; also cantilevered exposed-concrete stairs.
Agricultural buildings
Livestock housing construction and other agricultural buildings; practice-oriented solutions in collaboration with the client, architect, carpenter and other parties involved.
Trust & reputation

ranQ Trust Score of Birrer 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.

Birrer 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%
Birrer Bau AG scores 92.3 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.82.07%
Birrer 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%
Birrer Bau AG scores 2.3 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 35.2.34%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Birrer 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.

Knowledge

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Location

Rufibachstrasse 9
6318 Walchwil

At a glance

Legal form
Corporation
UID
CHE-105.868.325
Founded
1979 · 47 years
Last commercial register change
October 8, 2020
Employees
21 to 50
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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