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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,701 companies indexed · Last updated: today
DirectoryCrafts & TradesElectrical Planning & InstallationSt. MoritzKoller Elektro AG
Koller Elektro AG Logo
Verified· 3 sourcesTrust Score
Summary

About the company

Koller Elektro AG is an electrical installation and services company. It provides electrical installations and planning, smart‑home and building automation, switchboard manufacturing, safety and lighting planning, multimedia and professional audio/video and event-technology services, plus Miele appliance sales and service and telecommunications support.

AI-generated
Offering

Products & services

Industry:Electrical Planning & Installation
✓ Offered11
Electrical installations
Electrical installations for strong and weak current in new-builds and conversions, including large-scale projects, repairs, conversions, fire alarm, alarm and burglary systems as well as door intercom and video door entry systems.
Electrical planning
Electrical planning for new-builds and conversions, private homes, hotels and commercial properties, on request including project management, networks, energy management and building systems technology.
Building systems technology / Smart home
Building systems technology and smart home solutions for networked lighting, shading, heating, ventilation, air conditioning, security and entertainment electronics, with bus systems and automation systems.
Switchboard construction
Switchboards and panels for industry, commercial premises and residential installations, including manufacturing, assembly, adaptations of existing systems and replacement of asbestos panels.
Inspection and safety
Legal building inspections of electrical installations with safety verification (SiNa), periodic tests, acceptance reports and safety consulting.
Lighting design
Lighting design for indoor and outdoor areas with lighting calculations, 3D rendering, LED retrofits, control engineering, energy efficiency as well as delivery and installation of technical luminaires and designer lamps.
Multimedia, TV and home entertainment
Multimedia and TV solutions with consulting, planning, delivery, installation, commissioning, as well as service and repairs; also multiroom audio, networking and overall solutions.
Professional audio and video technology
Audio and video installations for hotels, restaurants, churches, clinics, conference rooms, meeting rooms and sports venues, including sound reinforcement, presentation, video and LED walls, and video surveillance.
Event and event technology
Rental of sound reinforcement and video solutions for events, including preparation, installation, on-site support and rental equipment such as TVs, projectors, screens, microphones, loudspeakers and lighting technology.
Miele CompetenceCenter
Miele showroom and consulting with kitchen and household appliances, washing and drying machines, vacuum cleaners, fully automatic coffee machines, as well as Miele cleaning products.
Telecommunications
Telecommunications and network installations with Ethernet, WLAN, alarm connections, provider-independent consulting and connection installations for communication technology.
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4.3/5

Koller Elektro AG

Trust & reputation

ranQ Trust Score of Koller Elektro AG: 4.3 out of 5.0

Trust Score4.3/ 5.0

Very high

x

Data basis 96% · As of October 2026

Koller Elektro AG scores 69.3 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.73.224%
  • 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%
Koller Elektro 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%
Koller Elektro AG scores 83.3 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).83.322%
Koller Elektro AG scores 77.1 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 35.77.14%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Koller Elektro AG reaches a ranQ Trust Score of 4.3 out of 5.0 — rated «Very high». The rating draws, among other things, on 4.7 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
4.7
of 5

Aggregated from 7 reviews across all connected sources

Sources
GGoogle4.77
★TrustpilotSoon
PProvenExpertSoon

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

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Location

Via Grevas 17
7500 St. Moritz
Opening hours
Mon
07:30 - 12:00, 13:30 - 17:00
Tue
07:30 - 12:00, 13:30 - 17:00
Wed
07:30 - 12:00, 13:30 - 17:00
Thu
07:30 - 12:00, 13:30 - 17:00
Fri
07:30 - 12:00, 13:30 - 17:00
Sat
Closed
Sun
Closed

At a glance

Legal form
Corporation
UID
CHE-106.846.007
Founded
2000 · 26 years
Last commercial register change
July 8, 2024
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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