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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,629 companies indexed · Last updated: today
DirectoryCrafts & TradesRoofingAltstätten SgIsabau GmbH
Isabau GmbH Logo
Verified· 3 sourcesTrust Score
Summary

About the company

The core activity of Isabau GmbH is the provision of services in the field of building envelopes, particularly in the areas of: Roofing work (flat and pitched roofs), Façade work (life expectancy, protection and architectural aesthetics), Sheet metal work (modern architecture and tradition), Roof maintenance, and Production of PV semi-finished products. The company offers comprehensive solutions for building envelopes and supports customers in the planning, consulting and execution of construction projects.

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Products & services

Industry:RoofingSheet Metal Work
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4.0/5

Isabau GmbH

✓ Offered4
Building envelope and roofing
Roofing, re-roofing, roof renovations and spot repairs for pitched roofs, flat roofs, roof windows and light domes on single-family homes, multi-family homes and commercial buildings.
Sheet metal work
Gutters, downpipes, chimney and wall connections, coping and wall cappings, sheet-metal cladding for photovoltaics as well as metal façades and repair work in copper, titanium-zinc, aluminium or galvanised steel.
Facades
Ventilated facades, metal facades, solar façades and façade renovations for new builds and energy-efficient renovations, including subsidy applications to the federal government, canton and municipality on request.
Photovoltaics
In-roof, roof-mounted and façade photovoltaics including battery storage, wallbox, service and maintenance, modernisation of existing systems, expansions and subsidy applications.
Trust & reputation

ranQ Trust Score of Isabau GmbH: 4.0 out of 5.0

Trust Score4.0/ 5.0

High

x

Data basis 96% · As of October 2026

Isabau GmbH scores 56.8 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.73.124%
  • 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.35.310%
  • 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.35.08%
Isabau GmbH scores 86.7 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.70.07%
Isabau 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%
Isabau GmbH scores 40.0 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 35.40.04%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Isabau GmbH reaches a ranQ Trust Score of 4.0 out of 5.0 — rated «High». The rating draws, among other things, on 5.0 out of 5 stars from 3 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
5
of 5

Aggregated from 3 reviews across all connected sources

Sources
GGoogle53
★TrustpilotSoon
PProvenExpertSoon

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

Knowledge

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Location

Metzgerstrasse 1
9450 Altstätten Sg

At a glance

Legal form
Limited Liability Company
UID
CHE-115.986.682
Founded
2010 · 16 years
Last commercial register change
January 29, 2014
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.
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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