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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,629 companies indexed · Last updated: today
DirectoryCrafts & TradesPlumbing & Building ServicesBuchrainJ. Wanner AG
J. Wanner AG Logo
Verified· 3 sourcesTrust Score
Summary

About the company

The core activity of J. Wanner AG is the planning, installation and maintenance of sanitary and heating systems. The company offers services such as bathroom renovations, sanitary installations and heating systems, and has a team of experts, including sanitary installers, heating and sanitary installers, as well as service technicians.

AI-generated
Offering

Products & services

Industry:Plumbing & Building Services
✓ Offered5
Plumbing and heating systems
Planning and installation of plumbing systems and heating systems for single- and multi-family houses, commercial, industrial and public buildings; heat pumps, district heating, wood-fired heating systems, drinking water and wastewater installations.
Plumbing and heating service
Maintenance, upkeep, servicing and repair of plumbing and heating installations; floor heating flushing, pipe cleaning, pump service, boiler descaling, water damage repair and service in the bathroom and kitchen.
Heating system refurbishment
Refurbishment of heating systems with on-site consultation, selection of suitable systems, installation of a new heating system, and application for permits and funding requests.
Bathroom renovation
Bathroom remodelling and renovations with planning, tailor-made solutions and ongoing support during the conversion.
Emergency building services
Standby and emergency call-outs outside regular working hours for building services faults, with an adapted travel and intervention flat fee.
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4.2/5

J. Wanner AG

Trust & reputation

ranQ Trust Score of J. Wanner AG: 4.2 out of 5.0

Trust Score4.2/ 5.0

Very high

x

Data basis 96% · As of October 2026

J. Wanner AG scores 69.4 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.70.024%
  • 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.61.010%
  • 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.78.08%
J. Wanner AG scores 89.3 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.70.07%
J. Wanner 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%
J. Wanner 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

J. Wanner AG reaches a ranQ Trust Score of 4.2 out of 5.0 — rated «Very high». The rating draws, among other things, on 4.5 out of 5 stars from 10 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
4.5
of 5

Aggregated from 10 reviews across all connected sources

Sources
GGoogle4.510
★TrustpilotSoon
PProvenExpertSoon

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

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Location

Schiltwaldstrasse 3
6033 Buchrain

At a glance

Legal form
Corporation
UID
CHE-107.282.685
Founded
1984 · 42 years
Last commercial register change
August 6, 2026
Employees
11 to 20
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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