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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,629 companies indexed · Last updated: today
DirectoryBusiness & Technical ServicesRental of Consumer GoodsLucerneKarl Koch AG
Karl Koch AG Logo
Verified· 3 sourcesTrust Score
Summary

About the company

The core activity of Geigenbau Koch includes the construction, sale, repair and rental of stringed instruments and guitars, as well as the sale of sheet music and recorder literature.

AI-generated
Offering

Products & services

Industry:Rental of Consumer Goods
✓ Offered7
Sale of string and plucked instruments
Sale of violins, violas, cellos, double basses, guitars, ukuleles, neck zithers, mandolins and recorders, as well as bows, accessories and strings.
Instrument rental
Renting violins, violas, cellos, double basses, guitars, mandolins and mandolons for music lessons, including insurance, bag and partially full service.
Repairs and restorations
Repairs and restorations of string and plucked instruments, including delicate work, warranty cases and timely execution in the workshop.
New builds and instrument making
New builds of violins, violas, cellos, gambas and guitars, as well as copies based on historical instruments, neck zithers and mandolins.
Expert advice
Personal, expert advice when buying, with rental instruments, for repairs and when selecting the right instrument.
Expert reports and insurance appraisals
Quotes for repairs, insurance assessments and expert reports in connection with string and plucked instruments.
Support for music school instrument presentations
Support for music school instrument presentations, as well as suitable rental instruments in all sizes for beginners.
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4.5/5

Karl Koch AG

Trust & reputation

ranQ Trust Score of Karl Koch AG: 4.5 out of 5.0

Trust Score4.5/ 5.0

Excellent

x

Data basis 96% · As of October 2026

Karl Koch AG scores 90.2 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.82.824%
  • 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.100.010%
  • 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.100.08%
Karl Koch 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 Koch 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 Koch AG 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

Karl Koch AG reaches a ranQ Trust Score of 4.5 out of 5.0 — rated «Excellent». The rating draws, among other things, on 4.7 out of 5 stars from 83 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
4.7
of 5

Aggregated from 83 reviews across all connected sources

Sources
GGoogle4.783
★TrustpilotSoon
PProvenExpertSoon

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

Knowledge

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Comparisons

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Location

Murbacherstrasse 15
6003 Lucerne
Opening hours
Mon
Closed
Tue
09:00 - 12:00, 13:30 - 18:30
Wed
09:00 - 12:00, 13:30 - 18:30
Thu
Closed
Fri
09:00 - 12:00, 13:30 - 18:30
Sat
09:00 - 16:00
Sun
Closed

At a glance

Legal form
Corporation
UID
CHE-107.252.885
Founded
1977 · 49 years
Last commercial register change
March 24, 2010
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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