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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,629 companies indexed · Last updated: today
DirectoryCrafts & TradesRoofingBernWeyermann K.W. AG
Weyermann K.W. AG Logo
Verified· 3 sourcesTrust Score
Summary

About the company

Weyermann K.W. AG is a roofing company that installs pitched and flat roofs, façade claddings, thermal insulation and solar systems. The company also provides maintenance (inspections, repairs, cleaning), drone aerial photography, energy consulting, planning and construction management.

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Offering

Products & services

Industry:RoofingSolar & Photovoltaics
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4.0/5

Weyermann K.W. AG

✓ Offered12
Pitched roofs
Pitched roof renovations, new builds and roofing with roof tiles, bricks, slate, natural slate, fibre-cement and “biber tail” tiles; including thermal insulation and under-roof lining.
Flat roofs
Flat roof waterproofing, renovations and new builds with warm roofs, cold roofs or inverted roofs; gravelled, greened and roof-terrace configurations.
Façade cladding
Ventilated façade systems for new builds and renovations, with small-, medium- and large-format cladding materials as well as a shingle rain screen.
Thermal insulation
Thermal insulation for roof and façade in new builds, conversions and renovations; to reduce energy costs, protect against cold and heat and as a basis for grants.
Solar systems
Photovoltaic systems and solar power plants for roofs, façades and open areas; grid-tied systems, stand-alone systems and building-integrated photovoltaic complete systems.
Roof maintenance (inspection)
Regular roof inspections including cleaning of the roof, gutters and downpipes/drains; early detection of damage and rectification of minor defects.
Repair work
Roof and façade repairs for leaks, storm damage and age-related wear; including restoration works and support in insurance cases.
Cleaning work
Cleaning of roofs and façades against moss, algae, lichen and other soiling; gentle treatment and a subsequent visual inspection with touch-ups.
Energy consulting
Independent, product-neutral consulting on solar systems, thermal insulation, building defects, MINERGIE and cantonal funding programmes.
Construction planning
Consulting and planning for roof and façade, including complete roof build-ups, material selection, thermal insulation and coordination of roof and façade design.
Site supervision
Site supervision and construction management mandates with site inspections, material monitoring, coordination, scheduling, acceptance/handovers, measurement and invoicing.
Funding programmes
Support for cantonal funding programmes for energy renovations; information on GEAK, submission of the application before construction start and the funding payments.
Trust & reputation

ranQ Trust Score of Weyermann K.W. AG: 4.0 out of 5.0

Trust Score4.0/ 5.0

High

x

Data basis 96% · As of October 2026

Weyermann K.W. AG scores 61.3 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.68.224%
  • 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.17.610%
  • 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.95.08%
Weyermann K.W. 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%
Weyermann K.W. 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%
Weyermann K.W. AG scores 14.3 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 35.14.34%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Weyermann K.W. AG 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 1 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 1 reviews across all connected sources

Sources
GGoogle51
★TrustpilotSoon
PProvenExpertSoon

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

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Location

Bottigenstrasse 114
3018 Bern
Opening hours
Mon
08:00 - 12:00, 14:00 - 17:00
Tue
08:00 - 12:00, 14:00 - 17:00
Wed
08:00 - 12:00, 14:00 - 17:00
Thu
08:00 - 12:00, 14:00 - 17:00
Fri
08:00 - 12:00, 14:00 - 17:00
Sat
Closed
Sun
Closed

At a glance

Legal form
Corporation
UID
CHE-108.076.303
Founded
1978 · 48 years
Last commercial register change
August 15, 2016
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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