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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,837 companies indexed · Last updated: today
DirectoryBusiness & Technical ServicesRepair of Consumer GoodsGrüt (Gossau Zh)Grünenwald Piano Service
Grünenwald Piano Service Logo
Verified· 3 sourcesTrust Score
Summary

About the company

The company Grünenwald Piano Service offers services around pianos and grand pianos, including piano tuning, repair, transport, purchase and sale as well as sound optimization.

AI-generated
Offering

Products & services

Industry:Repair of Consumer Goods
✓ Offered11
Piano and grand piano tuning
Tuning of pianos and grand pianos by ear, including for private use and concert performance; includes inspection of the instrument, pedal checks, cleaning of the keyboard and advice on room climate.
Repair and restoration of pianos and grand pianos
Repairs, revisions and comprehensive restorations of pianos and grand pianos; includes string replacement, manufacture of replacement parts and repairs to surface damage.
Piano and grand piano transport
Organized, insured transport of pianos and grand pianos by professional movers, including packing and pickup as well as delivery to the desired location.
Sound optimization (intonation)
Adjusting the sound of pianos and grand pianos to the desired tone character, for example softer, harder, less shrill or more balanced.
Regulation of pianos and grand pianos
Adjustment and optimization of the action when keys stick, the playing is heavy or the repetition is imprecise, for a better playing feel.
Assessment and expert opinion
Oral or written assessment of the condition and value of pianos and grand pianos, including an evaluation of repair requirements and potential quotations.
Buying and selling pianos and grand pianos
Advisory service, appraisal and brokerage for the purchase or sale of both pre-owned and new instruments, including transport solutions and accessories.
Consulting on pianos and grand pianos
Professional advice on instrument purchases, second opinions, on-site appraisals and support when making the buying decision.
Accessories and retrofits for pianos and grand pianos
Silent systems, humidifiers, Piano Life Saver, piano benches and castors, as well as other accessory solutions for the instrument and care.
Room acoustics optimization
Analysis, measurement and planning of room acoustics as well as installation of acoustic elements for a clearer and more pleasant sound from the instrument.
Yamaha dealer representation
Dealer representation for Yamaha pianos, including orderable B-series pianos and information on acoustic models with SILENT Piano\u2122 or TransAcoustic\u2122.
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4.2/5

Grünenwald Piano Service

Trust & reputation

ranQ Trust Score of Grünenwald Piano Service: 4.2 out of 5.0

Trust Score4.2/ 5.0

Very high

x

Data basis 96% · As of October 2026

Grünenwald Piano Service scores 85.1 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.87.924%
  • 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.76.210%
  • 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.88.08%
Grünenwald Piano Service scores 67.8 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.75.012%
  • 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%
Grünenwald Piano Service 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%
Grünenwald Piano Service scores 31.4 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 35.31.44%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Grünenwald Piano Service reaches a ranQ Trust Score of 4.2 out of 5.0 — rated «Very high». The rating draws, among other things, on 5.0 out of 5 stars from 19 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 19 reviews across all connected sources

Sources
GGoogle519
★TrustpilotSoon
PProvenExpertSoon

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

Knowledge

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Location

Fochenmattweg 12
8624 Grüt (Gossau Zh)
Opening hours
Mon
24h
Tue
24h
Wed
24h
Thu
24h
Fri
24h
Sat
24h
Sun
24h

At a glance

Legal form
Sole proprietorship
UID
CHE-238.680.289
Founded
2019 · 7 years
Last commercial register change
May 1, 2019
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.
67.0
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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