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

About the company

The core activity of Bähler Bau AG is the implementation of construction projects, particularly in the areas of facade renovation, energetic refurbishment, roof renovation, facade insulation, window replacement, heating and ventilation, as well as photovoltaic systems. The company offers competent consulting and comprehensive services from a single source, from planning to execution.

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Offering

Products & services

Industry:Building Construction
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Bähler Bau AG

Building Maintenance
✓ Offered9
Conversion, Refurbishment and Renovation
Conversion, refurbishment, renovation and extension by adding a storey of owner-occupied homes; from the quotation and permit submission to handover of the keys, all from one source.
Facade Renovation and Facade Insulation
Facade renovation with thermal insulation, rendered external wall insulation systems, facade render and facade paint; including handling the application through to construction approval.
Roof Refurbishment
Refurbishment of roofs with leaking roofing coverings or insufficient thermal insulation; including handling the application through to construction approval.
Window Replacement
Replacement of windows and doors made of plastic, plastic/aluminium, wood/aluminium or wood; for better living comfort, energy savings and improved sound insulation.
Heating Refurbishment and Ventilation
Replacement and refurbishment of heating and ventilation systems, in particular replacing fossil heating systems with renewable solutions such as heat pumps.
Photovoltaic System
Planning and installation of photovoltaic systems with solar modules, inverter, production meter, as well as clarifying approvals and subsidy support.
Painting and Plastering Work
Painting and plastering work for interior and exterior areas, including rendered external wall insulation systems and exterior painting.
Masonry and Tiling Work
Masonry work and tiling work as part of conversions, refurbishments and new builds.
Scaffolding Construction
Scaffolding construction as part of building and refurbishment services for facade, renovation and conversion work.
Trust & reputation

ranQ Trust Score of Bähler Bau AG: 4.4 out of 5.0

Trust Score4.4/ 5.0

Very high

x

Data basis 88% · As of October 2026

Bähler Bau AG scores 86.4 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.84.424%
  • 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.91.110%
  • Review recency: No data point — the criterion is taken out of the weighting and does not lower the score.—8%
Bähler Bau AG scores 85.0 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.83.012%
  • 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%
Bähler Bau AG 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%
Bähler Bau AG scores 17.1 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 35.17.14%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Bähler Bau AG reaches a ranQ Trust Score of 4.4 out of 5.0 — rated «Very high». The rating draws, among other things, on 4.8 out of 5 stars from 35 customer reviews. The data basis is 88%, 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
4.8
of 5

Aggregated from 35 reviews across all connected sources

Sources
GGoogle4.835
★TrustpilotSoon
PProvenExpertSoon

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

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Comparisons

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Location

Am Dorfbach 8
8308 Illnau
Opening hours
Mon
07:00 - 12:00, 13:00 - 17:00
Tue
07:00 - 12:00, 13:00 - 17:00
Wed
07:00 - 12:00, 13:00 - 17:00
Thu
07:00 - 12:00, 13:00 - 17:00
Fri
07:00 - 12:00, 13:00 - 17:00
Sat
Closed
Sun
Closed

At a glance

Legal form
Corporation
UID
CHE-376.650.918
Founded
2017 · 9 years
Last commercial register change
March 1, 2022
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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