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

About the company

Zgraggen - Ingenieure SIA is an engineering firm specializing in the development of building technology solutions. The company's core activity is to develop innovative and sustainable solutions for the planning and realization of buildings and areas, taking into account thermal simulation tools and state-of-the-art technologies.

AI-generated
Offering

Products & services

Industry:Technical Consulting & Engineering
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3.6/5

Zgraggen - Ingenieure SIA

✓ Offered8
Design of HVAC and sanitary systems
Design of heating, ventilation, air conditioning and sanitary systems for residential buildings, from concept phase to implementation in accordance with SIA phases 1–6.
Building owner advisory
Building owner advisory for building services and energy-related issues, including needs analysis and support for architecture competitions.
Feasibility studies
Feasibility studies and preliminary study phase 21/22 for building services, energy efficiency and building-climatic requirements.
Simulation and modelling
Thermal simulations of sites and buildings, modelling under different climate scenarios and consideration of RCP pathways.
Life cycle analyses
Life cycle analyses to align technical equipment and sustainability as well as to assess long-term energy efficiency.
Energy optimisation in operation
Energy optimisation of systems during ongoing operation, including evaluation of measurement data to improve system operation.
Measurements and analysis of building data
Regular measurements, evaluation of operating and measurement data, and detection of anomalies and malfunctions in building services systems.
Building services operation
Operation management of HLKS systems with analysis of operating data and support for an optimally set, efficient heating operation.
Trust & reputation

ranQ Trust Score of Zgraggen - Ingenieure SIA: 3.6 out of 5.0

Trust Score3.6/ 5.0

Solid

x

Data basis 96% · As of October 2026

Zgraggen - Ingenieure SIA scores 61.3 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.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.95.08%
Zgraggen - Ingenieure SIA scores 46.3 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.25.012%
  • 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%
Zgraggen - Ingenieure SIA 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%
Zgraggen - Ingenieure SIA scores 0.0 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 35.0.04%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Zgraggen - Ingenieure SIA reaches a ranQ Trust Score of 3.6 out of 5.0 — rated «Solid». 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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Location

Zähringerstrasse 23
6003 Lucerne
Opening hours
Mon
06:00 - 20:00
Tue
06:00 - 20:00
Wed
06:00 - 20:00
Thu
06:00 - 20:00
Fri
06:00 - 20:00
Sat
06:00 - 20:00
Sun
06:00 - 20:00

At a glance

Legal form
Sole proprietorship
UID
CHE-442.140.525
Founded
2025 · 1 year
Last commercial register change
April 3, 2025
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.
67.0
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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