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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,629 companies indexed · Last updated: today
DirectoryCrafts & TradesRoofingGuntershausen B. AadorfJakob Tanner AG
Jakob Tanner AG Logo
Verified· 3 sourcesTrust Score
Summary

About the company

The core activity of Jakob Tanner AG encompasses the planning, construction and maintenance of roof and façade constructions, including the installation of photovoltaic systems. The specific activities include the construction of pitched roofs, flat roofs and façades, as well as the creation of building envelopes that provide protection against weather influences while generating electricity.

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Products & services

Industry:Roofing
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4.0/5

Jakob Tanner AG

5
Pitched Roof
Pitched roofs from planning to completion, including cleaning of the roof and gutters, roof inspections, roof windows, sun protection, repairs and renovations.
Flat Roof
Flat roofs from planning to completion, soil build-up for greening, greening maintenance, cleaning of gutters and drains, inspections, leak detection and renovations.
Facade Construction
Facades made of slate, natural stone, Eternit, wood and shingles, also in combination, in various colours and forms, as well as advice for selection.
Photovoltaic Systems
Consulting, evaluation, installation and commissioning of PV systems, including support from planning through to commissioning.
Building Insulation
Insulation of houses using various materials as part of roofing and renovation work, coordinated with conversions and energy improvements.
Trust & reputation

ranQ Trust Score of Jakob Tanner AG: 4.0 out of 5.0

Trust Score4.0/ 5.0

High

x

Data basis 96% · As of October 2026

Jakob Tanner AG scores 60.4 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.63.324%
  • 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.45.610%
  • 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.70.08%
Jakob Tanner 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%
Jakob Tanner 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%
Jakob Tanner AG scores 11.7 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 35.11.74%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Jakob Tanner AG reaches a ranQ Trust Score of 4.0 out of 5.0 — rated «High». The rating draws, among other things, on 4.2 out of 5 stars from 5 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
4.2
of 5

Aggregated from 5 reviews across all connected sources

Sources
GGoogle4.25
★TrustpilotSoon
PProvenExpertSoon

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

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Location

Hauptstrasse 8
8357 Guntershausen B. Aadorf

At a glance

Legal form
Corporation
UID
CHE-107.086.049
Founded
1981 · 45 years
Last commercial register change
September 24, 2025
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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