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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,629 companies indexed · Last updated: today
DirectoryCrafts & TradesPlumbing & Building ServicesWinterthur3-Plan AG
3-Plan AG Logo
Verified· 3 sourcesTrust Score
Summary

About the company

3-Plan AG is an engineering and consulting firm focused on building services and energy for the built environment. It delivers project development, technical building services planning (electrical, heating, ventilation, cooling, sanitary), specialist coordination, BIM/VDC services, prefabrication (Planer Plus), and support for operation and project management.

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Offering

Products & services

Industry:Plumbing & Building Services
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4.4/5

3-Plan AG

✓ Offered8
Building Services Engineering
Planning of building services for electrical, heating, ventilation, cooling and sanitary systems; needs analysis, concept design and detailed design for functional, energy-efficient and safe buildings.
Technical Coordination
Coordination of the technical trades in building construction, coordination of electrical, heating, ventilation, cooling and sanitary systems, and integration into building planning.
Energy and Power Systems
Planning and development of energy systems in building construction, with a focus on renewable energies, efficient use of resources and sustainable solutions.
BIM / VDC
Digital modelling and design methods using Building Information Modeling and Virtual Design and Construction for collaboration, transparency and implementable solutions.
Technical Concept Support
Independent consulting for the early technical and energy development of properties, defining the appropriate level of technical equipment and sustainable energy systems.
Competitions
Involvement in early development phases and support for technical and energy-related questions as part of competitions.
Analyses, Measurements and Optimisations
Measurement, analysis and optimisation of technical systems and operating processes to improve plant operation and address optimisation potential.
Digital Asset Management
Digital management of technical installations with new solution approaches for ongoing operation and plant administration.
Trust & reputation

ranQ Trust Score of 3-Plan AG: 4.4 out of 5.0

Trust Score4.4/ 5.0

Very high

x

Data basis 96% · As of October 2026

3-Plan AG scores 76.3 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.72.324%
  • 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.84.710%
  • 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%
3-Plan AG scores 94.3 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.90.07%
3-Plan 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%
3-Plan AG scores 85.7 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 35.85.74%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

3-Plan AG reaches a ranQ Trust Score of 4.4 out of 5.0 — rated «Very high». The rating draws, among other things, on 4.5 out of 5 stars from 27 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
4.5
of 5

Aggregated from 27 reviews across all connected sources

Sources
GGoogle4.527
★TrustpilotSoon
PProvenExpertSoon

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

Knowledge

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Location

Albert-Einstein-Strasse 15
8404 Winterthur
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 - 12:00
Sat
Closed
Sun
Closed

At a glance

Legal form
Corporation
UID
CHE-103.814.442
Founded
1993 · 33 years
Last commercial register change
February 19, 2025
Employees
51 to 100
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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