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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint746,904 companies indexed · Last updated: today
DirectoryEnergy & EnvironmentPhotovoltaicsFtanRoman Erni AG
Roman Erni AG Logo
Verified· 2 sourcesTrust Score
Summary

About the company

The core activity of Roman Erni AG is the provision of services in the fields of roofing, sheet metal work and photovoltaics. Specifically, this includes the planning, execution and maintenance of roof structures, including sealing, roofing, sheet metal work, photovoltaic systems, aerial lift work, roof windows and winter services. The company also offers consulting and training in these areas.

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Service area

Offering

Products & services

Industry:Photovoltaics
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Roman Erni AG

✓ Offered5
Photovoltaic systems
Photovoltaic systems for single-family homes, multi-family homes, hotels, commercial buildings and mountain farm buildings; planning, assembly, implementation, building submissions, grants, installation, commissioning, self-consumption optimization, system monitoring, maintenance and service.
Solar roof
Solar roofs for integration into roof surfaces, façades, garden fences or carports; using solar energy to generate electricity with your own supply.
Consulting
Consulting and planning for photovoltaic systems; development of the concept as the start of the project up to the implementation-ready system.
Installation and commissioning
Installation and commissioning of photovoltaic systems; professional execution of the system up to the start of operation.
Maintenance and service
Maintenance, service and system monitoring for photovoltaic systems; ongoing operation and functional checks of the system.
Trust & reputation

ranQ Trust Score of Roman Erni AG: 4.1 out of 5.0

Trust Score4.1/ 5.0

High

x

Data basis 54% · As of November 2026

Without public customer reviews the score stays capped.

Roman Erni 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.
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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%
Roman Erni AG scores 89.3 out of 100 points in the Substance area of the ranQ Trust Score. This area carries 28% of the weighting.
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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%
Roman Erni AG scores 85.0 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).85.022%
Roman Erni AG scores 2.3 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 35.2.34%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Roman Erni 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 November 2026.

The Trust Score cannot be bought and is calculated from publicly verifiable data.

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Location

Sainas 139A
7551 Ftan

At a glance

Legal form
Corporation
UID
CHE-103.657.088
Founded
1986 · 40 years
Last commercial register change
November 2, 2022
Employees
11 to 20

Active in 1 of 26 cantons

  • GRGrisons
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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