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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint747,212 companies indexed · Last updated: today
DirectoryCrafts & TradesHeating installerBaselContech Installationen GmbH
Contech Installationen GmbH Logo
Verified· 3 sourcesTrust Score
Summary

About the company

Contech Installationen GmbH plans and carries out plumbing and heating installations. Its services include new installations, renovations, repairs and maintenance, as well as coordinating building-services projects.

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Presence

Service area

Offering

Products & services

Industry:Heating installerPlumber
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4.0/5

Contech Installationen GmbH

✓ Offered4
Sanitary and heating technology
Sanitary and heating technology for Basel and the surrounding area, including new installations, renovations, installation management and repairs.
Repairs / emergency service
Repairs and 24-hour emergency service for damage incidents, especially water damage; choice of sanitary, heating or both and quick feedback by service technicians.
New-build installations
Building services for new builds with plan uploads, an appointment for preliminary clarification and subsequent quotes for clients, architects, engineers and contractors.
Conversion and renovation work
Plumbing and heating work for conversions and renovations, including bathroom refurbishment, replacement of heating systems and coordination of other trades.
Trust & reputation

ranQ Trust Score of Contech Installationen GmbH: 4.0 out of 5.0

Trust Score4.0/ 5.0

High

x

Data basis 88% · As of November 2026

Contech Installationen GmbH scores 64.5 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.65.024%
  • 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.63.210%
  • Review recency: No data point — the criterion is taken out of the weighting and does not lower the score.—8%
Contech Installationen GmbH scores 75.7 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.83.012%
  • 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%
Contech Installationen GmbH scores 86.7 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).86.722%
Contech Installationen GmbH scores 3.4 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 35.3.44%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Contech Installationen GmbH reaches a ranQ Trust Score of 4.0 out of 5.0 — rated «High». The rating draws, among other things, on 4.3 out of 5 stars from 11 customer reviews. The data basis is 88%, so the score is backed by part of the criteria. As of November 2026.

The Trust Score cannot be bought and is calculated from publicly verifiable data.

Reviews

Aggregated rating

Aggregated rating
4.3
of 5

Aggregated from 11 reviews across all connected sources

Sources
GGoogle4.311
★TrustpilotSoon
PProvenExpertSoon

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

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Location

Ryffstr. 21
4056 Basel
Opening hours
Mon
08:00 - 17:00
Tue
08:00 - 17:00
Wed
08:00 - 17:00
Thu
08:00 - 17:00
Fri
08:00 - 17:00
Sat
Closed
Sun
Closed

At a glance

Legal form
Limited Liability Company
UID
CHE-489.730.496
Founded
2017 · 9 years
Last commercial register change
November 17, 2025
Employees
1 to 10

Active in 1 of 26 cantons · 1 municipality

  • BSBasel
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.
88.0
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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