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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint747,212 companies indexed · Last updated: today
DirectoryConstruction & ArchitectureBuilding services engineerGelterkindenGrether + Schäfer AG
Grether + Schäfer AG Logo
Verified· 3 sourcesTrust Score
Summary

About the company

Grether + Schäfer AG is an engineering firm providing integrated planning for building services in heating, ventilation and air conditioning. Its services include feasibility studies, energy assessments, tender and execution documents, technical coordination and construction supervision.

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Presence

Service area

Offering

Products & services

Industry:Building services engineer
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3.9/5

Grether + Schäfer AG

✓ Offered12
Building services planning HVAC
Integrated planning of building services systems HVAC for simple and complex construction projects; solutions for heating, heat, cooling, ventilation and solar.
Feasibility studies and concepts
Feasibility studies and concepts for building services and HVAC projects as a basis for further planning.
Energy statements
Energy statements for construction and building services projects, as part of the planning and approval documents.
Cooling load calculations
Cooling load calculations for HVAC and building services projects for sizing cooling and system concepts.
Tender documents
Preparation of tender documents for building services and HVAC systems, including technical documents for the award.
Specialist coordination
Specialist coordination between the involved designers and trades for building services projects.
Subsidy applications
Preparation and submission of subsidy applications in connection with energy and building services projects.
Execution documentation
Execution documentation for the implementation of heating, ventilation, cooling and solar projects.
General specialist planning for heating replacement
General specialist planning for heating replacement, including supervision of the ancillary trades and technical support throughout the project.
Specialist site supervision
Specialist site supervision for building services projects, including support during execution and coordination on site.
Pre-projects
Pre-projects for heating, ventilation, cooling and solar systems as a basis for the further project development.
Permit procedures and inspections
Support with permit procedures and inspections for building services and HVAC projects.
Trust & reputation

ranQ Trust Score of Grether + Schäfer AG: 3.9 out of 5.0

Trust Score3.9/ 5.0

High

x

Data basis 96% · As of November 2026

Grether + Schäfer 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%
Grether + Schäfer 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%
Grether + Schäfer AG scores 86.7 out of 100 points in the Identity area of the ranQ Trust Score. This area carries 22% of the weighting.
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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).86.722%
Grether + Schäfer AG scores 11.7 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 35.11.74%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Grether + Schäfer 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 November 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

Rünenbergerstrasse 44
4460 Gelterkinden

At a glance

Legal form
Corporation
UID
CHE-102.849.053
Founded
1997 · 29 years
Last commercial register change
December 4, 2023
Employees
11 to 20

Active in 1 of 26 cantons · 1 municipality

  • BLGelterkinden
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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