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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,629 companies indexed · Last updated: today
DirectoryConstruction & ArchitectureSpecialized Construction ActivitiesRaronGruber Polybau AG
Gruber Polybau AG Logo
Verified· 3 sourcesTrust Score
Summary

About the company

The core activity of Gruber Polybau AG encompasses the provision of services in the field of roofing, sheet metal and sealing construction, as well as facade construction. Specifically, this includes: sheet metal work, roofing work (in particular pitched roofs), sealing work, and facade work (in particular ventilated and suspended facades). The company thus offers a wide range of services in the construction industry, particularly in the field of roof and facade constructions.

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Products & services

Industry:Specialized Construction Activities
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4.3/5

Gruber Polybau AG

✓ Offered4
Roofing work
Pitched roofs with tiles, PREFA, wooden shingles and Eternit, double lock seam roofs, sheet metal roofing as well as prefabricated roof window elements.
Sheet metal work
Cladding made of copper, zinc, stainless steel and aluminium for dormers, roofs and chimneys, roof drainage systems, sheet metal roofs, and general sheet metal work.
Flat roof work and waterproofing
Flat roof work with bituminous sealing membranes and plastic sealing membranes, roof greening, gravel roof coverings, and skylights and roof windows.
Facade work
Ventilated rainscreen facades with almost all standard materials.
Trust & reputation

ranQ Trust Score of Gruber Polybau AG: 4.3 out of 5.0

Trust Score4.3/ 5.0

Very high

x

Data basis 96% · As of October 2026

Gruber Polybau AG scores 79.1 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.83.024%
  • 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.70.510%
  • 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.78.08%
Gruber Polybau AG scores 85.5 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%
Gruber Polybau AG 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%
Gruber Polybau 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

Gruber Polybau AG reaches a ranQ Trust Score of 4.3 out of 5.0 — rated «Very high». The rating draws, among other things, on 4.9 out of 5 stars from 15 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
4.9
of 5

Aggregated from 15 reviews across all connected sources

Sources
GGoogle4.915
★TrustpilotSoon
PProvenExpertSoon

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

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Location

Theaterstrasse 11
3942 Raron
Opening hours
Mon
07:30 - 12:00, 13:00 - 17:00
Tue
07:30 - 12:00, 13:00 - 17:00
Wed
07:30 - 12:00, 13:00 - 17:00
Thu
07:30 - 12:00, 13:00 - 17:00
Fri
07:30 - 12:00, 13:00 - 17:00
Sat
Closed
Sun
Closed

At a glance

Legal form
Corporation
UID
CHE-103.584.940
Founded
1986 · 40 years
Last commercial register change
October 10, 2023
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.
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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