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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint746,904 companies indexed · Last updated: today
DirectoryCrafts & TradesPlumberForel (Lavaux)Joseph Diémand SA
Joseph Diémand SA Logo
Verified· 4 sourcesTrust Score
Summary

About the company

Joseph Diémand SA specialises in plumbing and sanitary installations for homes, hotels, hospitals, care homes and industry. It plans and carries out new installations and renovations, and provides water treatment, wastewater treatment and gas installation services.

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Service area

Offering

Products & services

Industry:Plumber
✓ Offered4
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4.2/5

Joseph Diémand SA

Sanitary installations
Sanitary installations for residential properties, hotels, hospitals, EMS and industry; new construction, renovations, maintenance, fault repair, study, planning and technical coordination.
Water treatment
Treatment of cold, mixed and industrial water; recovery and reuse of rainwater; filtration, softening, desalination, conditioning, neutralisation and wastewater treatment.
Gas sector
Installations for natural and liquefied gas, oxygen, acetylene and medical gases.
Additional services
Expertise for defective installations, prefabrication of frames, provision of a central vacuum system and site monitoring on request.
Trust & reputation

ranQ Trust Score of Joseph Diémand SA: 4.2 out of 5.0

Trust Score4.2/ 5.0

Very high

x

Data basis 100% · As of November 2026

Joseph Diémand SA scores 70.7 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.57.424%
  • 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.88.910%
  • 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%
Joseph Diémand SA scores 92.3 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.82.07%
Joseph Diémand SA scores 88.3 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).88.322%
Joseph Diémand SA scores 32.2 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 35.54.34%
  • Media authority: Quality and number of editorial mentions, weighted by the importance of the source, plus the recency of the latest high-quality mention.10.04%
Qualifications+0.00

Joseph Diémand SA reaches a ranQ Trust Score of 4.2 out of 5.0 — rated «Very high». The rating draws, among other things, on 4.1 out of 5 stars from 32 customer reviews. As of November 2026.

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

Reviews

Aggregated rating

Aggregated rating
4.1
of 5

Aggregated from 32 reviews across all connected sources

Sources
GGoogle4.132
★TrustpilotSoon
PProvenExpertSoon

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

Press

Media

May 29, 2016Media
Holdigaz a investi 25 millions pour ses activités du bâtiment
tdg.ch

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Location

Route de l'Industrie 2
1072 Forel (Lavaux)
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 - 15:45
Sat
Closed
Sun
Closed

At a glance

Legal form
Corporation
UID
CHE-105.762.632
Founded
1952 · 74 years
Last commercial register change
July 8, 2026
Employees
21 to 50

Active in 1 of 26 cantons

  • VDVaud
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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