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

About the company

The core activity of Isler & Isler AG consists of planning, execution, repair and expertise of sanitary facilities, heating systems, solar systems, water softening systems, rainwater harvesting and controlled residential ventilation. The company also offers services in the field of kitchen and bathroom renovations, descaling of boilers and water heaters, as well as professional repairs.

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Offering

Products & services

Industry:Plumbing & Building ServicesSheet Metal Work
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4.0/5

Isler & Isler AG

✓ Offered6
Sanitary installations
Planning, installation work and repairs of sanitary installations in new builds and conversions; cold, hot and gas pipes, rainwater and foul wastewater pipes, boilers and hot water heaters.
Heating installations
Heating installations and heating system refurbishments in new builds and conversions; smaller adjustments and extensions, replacement of radiators, pumps and valves, flushing of the heating system.
Solar installations
Planning and installation of thermal solar systems; installation of collectors, solar connection lines, adjustment of water installations, replacement of old boilers with solar water heaters, repairs.
Bathroom renovation
Planning and implementation of bathroom conversions; design of the bathroom, kitchen and bathroom renovations, ideas and products for modern bathroom solutions.
Water softening systems
Advice, sizing and installation of water softening systems for hard water; matched to water hardness and consumption, protection of the washing machine and water heater.
Repairs
Professional repairs in the sanitary and heating sector; help with leaking fittings, lack of hot water, blocked drains and minor replacements.
Trust & reputation

ranQ Trust Score of Isler & Isler AG: 4.0 out of 5.0

Trust Score4.0/ 5.0

High

x

Data basis 96% · As of October 2026

Isler & Isler AG scores 61.1 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.58.824%
  • 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.52.910%
  • 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%
Isler & Isler 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%
Isler & Isler 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%
Isler & Isler AG scores 22.9 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 35.22.94%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Isler & Isler AG reaches a ranQ Trust Score of 4.0 out of 5.0 — rated «High». The rating draws, among other things, on 4.0 out of 5 stars from 7 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
of 5

Aggregated from 7 reviews across all connected sources

Sources
GGoogle47
★TrustpilotSoon
PProvenExpertSoon

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

Knowledge

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Comparisons

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Location

Dorfstrasse 5
8302 Kloten
Opening hours
Mon
07:30 - 17:00
Tue
07:30 - 17:00
Wed
07:30 - 17:00
Thu
07:30 - 17:00
Fri
07:30 - 16:00
Sat
Closed
Sun
Closed

At a glance

Legal form
Corporation
UID
CHE-107.924.236
Founded
1991 · 35 years
Last commercial register change
May 16, 2018
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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