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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,937 companies indexed · Last updated: today
DirectoryCrafts & TradesPlumbing & Building ServicesThusisKarl Burkhardt und Sohn AG
Karl Burkhardt und Sohn AG Logo
Verified· 3 sourcesTrust Score
Summary

About the company

Karl Burkhardt und Sohn AG is a building-technology and trades company. It provides sanitary installations, sheet-metal work, roofing, repair services and bathroom planning.

AI-generated
Offering

Products & services

Industry:Plumbing & Building Services
✓ Offered5
Sanitary installations
Sanitary facilities for new builds and renovations, planning and installation of water and sewer pipework systems, water supply networks, snow-making and industrial installations.
Bathroom planning and refurbishment
Bathroom planning, bathroom renovation and bathroom conversions—from advice and sketches and site measurements to installation and implementation, all from one source.
Sheet-metal works
Gutters and downpipes, cappings and cladding, double-lock standing seam roofs, metal façades, dormers, custom sheet-metal work, lightning protection systems, as well as repairs and service work.
Roof covering
Roof coverings, thermal insulation for roof and façade, façade cladding, flat-roof work with insulation and green roofing, roof inspections, asbestos remediation and installation of roof windows.
Repair service
24-hour on-call service for damage to water systems, sheet-metal work and roofs, blocked drains, leaking fittings, boiler descaling, filter changes, maintenance and service subscriptions.
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4.5/5

Karl Burkhardt und Sohn AG

Trust & reputation

ranQ Trust Score of Karl Burkhardt und Sohn AG: 4.5 out of 5.0

Trust Score4.5/ 5.0

Excellent

x

Data basis 96% · As of October 2026

Karl Burkhardt und Sohn AG scores 91.4 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.91.524%
  • 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.88.110%
  • 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%
Karl Burkhardt und Sohn 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%
Karl Burkhardt und Sohn 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%
Karl Burkhardt und Sohn AG scores 45.7 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 35.45.74%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Karl Burkhardt und Sohn AG reaches a ranQ Trust Score of 4.5 out of 5.0 — rated «Excellent». The rating draws, among other things, on 5.0 out of 5 stars from 31 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 31 reviews across all connected sources

Sources
GGoogle531
★TrustpilotSoon
PProvenExpertSoon

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

Knowledge

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Comparisons

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Location

Italienische Strasse 15
7430 Thusis
Opening hours
Mon
08:00 - 17:15
Tue
08:00 - 17:15
Wed
08:00 - 17:15
Thu
08:00 - 17:15
Fri
08:00 - 17:15
Sat
Closed
Sun
Closed

At a glance

Legal form
Corporation
UID
CHE-107.058.455
Founded
1962 · 64 years
Last commercial register change
May 5, 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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