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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,887 companies indexed · Last updated: today
DirectoryBusiness & Technical ServicesTechnical Consulting & EngineeringZurichIngenieurbüro Janzi AG
Ingenieurbüro Janzi AG Logo
Verified· 3 sourcesTrust Score
Summary

About the company

The core activity of Ingenieurbüro Janzi AG is planning, design, consulting and specialized construction management in the electrical engineering and security sector, particularly in the areas of building electrical planning, safety technology, building automation, energy distribution and supply, lighting design as well as tele- and data communication.

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Products & services

Industry:Technical Consulting & Engineering
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3.9/5

Ingenieurbüro Janzi AG

Electrical Planning & Installation
✓ Offered11
Electrical planning and project engineering
Planning and project engineering in the electrical engineering and security sector, including building electrical design, security engineering, building automation, power distribution and supply, lighting design as well as tele- and data communication.
Advisory services and specialist construction management
Consulting, client advisory and specialist construction management for electrical and security engineering projects, including support for implementation and compliance with the relevant standards.
Cost estimates, budget and schedule planning
Cost estimates and cost pre-approvals, budget planning, work sequence and schedule planning as well as schedule and cost control for projects.
Planning documents and approval procedures
Preparation of planning documents, submission, as well as plan approvals and permit procedures for electrical projects.
Operation and maintenance
Operation and maintenance of electrical systems, complemented by technical and structural acceptance inspections.
Electrical engineering
External and internal lightning protection systems, foundation earthing and potential equalization, high- and low-voltage installations for high-rise and industrial buildings.
Monitoring and security technology
Security and monitoring technology for buildings and facilities, within the scope of electrical engineering planning and execution.
Telecommunications and data communication
Data communication technology, universal building cabling, telephone, DECT, TV and SAT systems, as well as conference and media technology.
Building automation
Building automation with KNX/EIB systems, control engineering and radio systems for technical building equipment.
Power supply
Power supply and power distribution for building and industrial projects as part of electrical engineering planning.
Lighting design
Lighting design for building and project environments as part of specialist electrical engineering design.
Trust & reputation

ranQ Trust Score of Ingenieurbüro Janzi AG: 3.9 out of 5.0

Trust Score3.9/ 5.0

High

x

Data basis 96% · As of October 2026

Ingenieurbüro Janzi AG scores 49.8 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.68.224%
  • 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.17.610%
  • 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.35.08%
Ingenieurbüro Janzi 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%
Ingenieurbüro Janzi 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%
Ingenieurbüro Janzi AG scores 11.4 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 35.11.44%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Ingenieurbüro Janzi AG reaches a ranQ Trust Score of 3.9 out of 5.0 — rated «High». The rating draws, among other things, on 5.0 out of 5 stars from 1 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 1 reviews across all connected sources

Sources
GGoogle51
★TrustpilotSoon
PProvenExpertSoon

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

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Secure profile

Location

Thurgauerstrasse 74
8050 Zurich

At a glance

Legal form
Corporation
UID
CHE-107.843.678
Founded
1997 · 29 years
Last commercial register change
August 16, 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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