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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,629 companies indexed · Last updated: today
DirectoryCrafts & TradesRoofingLausanneRoger Gremper SA
Roger Gremper SA Logo
Verified· 3 sourcesTrust Score
Summary

About the company

Roger Gremper SA is a company providing roofing, sheet-metal and sanitary installation services, and also installs roof windows while offering maintenance and repair services. Its work includes flat and pitched roofs, custom metal profiles, installation of solar collectors, insulation and ventilation measures, and various plumbing tasks.

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Offering

Products & services

Industry:RoofingSheet Metal Work
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Roger Gremper SA

✓ Offered5
Sheet metal work - Roof covering
Sheet metal and roof covering work for flat roofs and pitched roofs, underlay, vapour barrier, insulation of roofs and façades, custom-made profiles and fittings.
Plumbing installations
Sanitary installations, stainless steel, copper, PE, iron, cast-iron, PP and PVC piping, bathroom renovations, pipe cleaning, gas connection and breakdown service.
Roof windows and skylight domes
Installation of VELUX and ROTO roof windows, with decorative and solar protection products, external roller shutters, cover frames and mounting products.
Maintenance and breakdown service
Breakdown, maintenance and after-sales service for roof covering, sheet metal work and plumbing installations.
Energy consulting and building energy certification
Issuance of building energy certificates, energy calculations and measures to prevent energy loss in buildings.
Trust & reputation

ranQ Trust Score of Roger Gremper SA: 4.1 out of 5.0

Trust Score4.1/ 5.0

High

x

Data basis 96% · As of October 2026

Roger Gremper SA scores 69.2 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.67.424%
  • 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.58.610%
  • 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.88.08%
Roger Gremper SA 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%
Roger Gremper SA 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%
Roger Gremper SA 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

Roger Gremper SA reaches a ranQ Trust Score of 4.1 out of 5.0 — rated «High». The rating draws, among other things, on 4.4 out of 5 stars from 9 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
4.4
of 5

Aggregated from 9 reviews across all connected sources

Sources
GGoogle4.49
★TrustpilotSoon
PProvenExpertSoon

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

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Comparisons

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Location

Avenue d'Echallens 38
1004 Lausanne
Opening hours
Mon
07:30 - 12:00, 13:00 - 17:00
Tue
07:30 - 12:00, 13:00 - 17:00
Wed
07:30 - 12:00, 13:00 - 17:00
Thu
07:30 - 12:00, 13:00 - 17:00
Fri
07:30 - 12:00, 13:00 - 16:30
Sat
Closed
Sun
Closed

At a glance

Legal form
Corporation
UID
CHE-102.129.622
Founded
1982 · 44 years
Last commercial register change
January 31, 2023
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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