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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,629 companies indexed · Last updated: today
DirectoryCrafts & TradesElectrical Planning & InstallationSteckbornIlg & Köstli AG
Ilg & Köstli AG Logo
Verified· 3 sourcesTrust Score
Summary

About the company

Ilg & Köstli AG is an owner-managed electrical company providing electrical installations and energy and communication solutions. Its services include planning, photovoltaic systems and battery storage, smart‑home integration, e‑mobility charging, building automation, lighting, communication and a 24-hour emergency service.

AI-generated
Offering

Products & services

Industry:Electrical Planning & Installation
✓ Offered8
Electrical installations
Electrical installations for single- and multi-family homes as well as smaller businesses, including power supply, distribution and protection for high-power systems.
Design of electrical installations
Design of electrical installations for construction projects, with a free initial consultation and sizing for single-family homes, multi-family homes and smaller businesses.
Building automation
Building automation with network cabling, telephone systems, WLAN, fibre-optic networks and DSL connections for municipalities, companies, schools and private households.
Smart home solutions
Smart home solutions for automated control of shading, ventilation, heating, lighting and power consumption, including systems such as Loxone, KNX and Wiser.
E-mobility
Advisory, design and commissioning of charging stations for electric vehicles for private households, commercial use and public applications, including charging management.
Communication technology
Communication technology for internet, TV and telephone, including DSL, satellite, radio, infrared, multimedia and broadband, as well as telephone systems for schools and SMEs.
Lighting planning and lighting
Lighting solutions for the garden, home office, living rooms and Christmas lighting, including advice and collaboration with lighting suppliers.
24h emergency service for electrical installations
Round-the-clock emergency service for outages of lighting, power, solar panels or heating outside business hours.
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4.5/5

Ilg & Köstli AG

Trust & reputation

ranQ Trust Score of Ilg & Köstli AG: 4.5 out of 5.0

Trust Score4.5/ 5.0

Excellent

x

Data basis 96% · As of October 2026

Ilg & Köstli AG scores 83.7 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.88.324%
  • 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.77.410%
  • 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%
Ilg & Köstli AG scores 93.9 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.82.07%
Ilg & Köstli 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%
Ilg & Köstli AG scores 28.6 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 35.28.64%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Ilg & Köstli AG reaches a ranQ Trust Score of 4.5 out of 5.0 — rated «Excellent». The rating draws, among other things, on 5.0 out of 5 stars from 20 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 20 reviews across all connected sources

Sources
GGoogle520
★TrustpilotSoon
PProvenExpertSoon

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

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Location

Grabenstrasse 9
8266 Steckborn
Opening hours
Mon
07:00 - 12:00, 13:15 - 17:00
Tue
07:00 - 12:00, 13:15 - 17:00
Wed
07:00 - 12:00, 13:15 - 17:00
Thu
07:00 - 12:00, 13:15 - 17:00
Fri
07:00 - 12:00, 13:15 - 17:00
Sat
Closed
Sun
Closed

At a glance

Legal form
Corporation
UID
CHE-114.658.643
Founded
2009 · 17 years
Last commercial register change
April 14, 2022
Employees
21 to 50
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.85.03%
    • Full methodology

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