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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,937 companies indexed · Last updated: today
DirectoryCrafts & TradesRoofingRorschachCarl Franke AG
Carl Franke AG Logo
Verified· 2 sourcesTrust Score
Summary

About the company

The core activity of Carl Franke Haustechnik AG is the planning and execution of building technology in residential and commercial construction, including: Heating: design, estimation, installation of heat generators and distribution systems Sanitary: planning and execution of water, gas, compressed air and chemical lines, swimming pools and laundry drains Industrial piping: construction of industrial and commercial piping, cooling basins, transport lines and house connections Liquefied gas: inspection and installation of liquefied gas systems Solar systems: neutral design and estimation of solar systems The company also offers services such as cost estimates, scheduling and coordination with subcontractors.

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Offering

Products & services

Industry:RoofingSheet Metal Work
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Carl Franke AG

Solar & Photovoltaics
✓ Offered6
Sheet metal work
Processing of sheet metal, non-ferrous metals and ferrous metals; gutters, downpipes, connection sheets, flashings, dormer cladding, gable-end cladding and wall junctions.
Roofing work
Roofing work for flat and pitched roofs, including inspection, cleaning, repairs as well as maintenance and minor partial repairs to preserve value.
Lightning protection systems
Planning and installation of lightning protection systems according to the latest regulations, including correspondence with the building insurance.
Industrial sheet metal work
Processing of non-ferrous and ferrous metals in thicknesses from 1 mm to 6 mm; planning, fabrication and assembly of structures as well as repairs of metal parts.
Metal roofs
Planning, fabrication and installation of metal roofs as well as matching sheet-metal work and custom made-to-measure items.
Special waterproofing
Special waterproofing as part of modernisation, renovation and repair of roof and building envelopes.
Trust & reputation

ranQ Trust Score of Carl Franke AG: 4.1 out of 5.0

Trust Score4.1/ 5.0

High

x

Data basis 54% · As of October 2026

Without public customer reviews the score stays capped.

Carl Franke AG has no value in the Reputation area of the ranQ Trust Score because no data is available. The area carries 42% of the weighting and drops out of the calculation for this profile; it does not lower the score, only the reported data basis.
x
CriterionValueWeight
  • Review quality: No data point — the criterion is taken out of the weighting and does not lower the score.—24%
  • Review volume: No data point — the criterion is taken out of the weighting and does not lower the score.—10%
  • Review recency: No data point — the criterion is taken out of the weighting and does not lower the score.—8%
Carl Franke AG scores 85.5 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.55.07%
Carl Franke AG scores 83.3 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).83.322%
Carl Franke AG scores 2.6 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 35.2.64%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Carl Franke AG reaches a ranQ Trust Score of 4.1 out of 5.0 — rated «High». No public customer reviews are available for this provider; the rating is based on the remaining criteria. The data basis is 54%, 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.

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Location

Säntisstrasse 9
9400 Rorschach

At a glance

Legal form
Corporation
UID
CHE-102.572.555
Founded
1980 · 46 years
Last commercial register change
November 3, 2015
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.
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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