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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,701 companies indexed · Last updated: today
DirectoryCrafts & TradesPlumbing & Building ServicesBiel/BienneFranconi und Grob AG
Franconi und Grob AG Logo
Verified· 3 sourcesTrust Score
Summary

About the company

The core activity of Franconi + Grob AG is the planning, execution and maintenance of building and energy technology systems, particularly in the areas of plumbing, heating, solar systems and heat pumps. The company offers services such as the installation, renovation and maintenance of plumbing systems, heating systems, solar systems and heat pumps for single-family homes, multi-family homes, administrative buildings and industrial facilities.

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Offering

Products & services

Industry:Plumbing & Building ServicesRoofing
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4.6/5

Franconi und Grob AG

Sheet Metal Work
✓ Offered3
Sanitary installations
Sanitary solutions for conversions and new builds, including consultation, planning and installation; installation of water, waste water, gas and compressed-air lines as well as appliances.
Heating
Heating renovations and new heating systems with consultation, planning and installation; heat pumps, wood-fired systems, solar thermal, oil and gas boilers, mobile heating as well as refrigeration technology.
Service
Service, maintenance and repairs for heating and sanitary systems; boiler descaling, chemical descaling, retrofit of shower WC as well as fault response and maintenance work.
Trust & reputation

ranQ Trust Score of Franconi und Grob AG: 4.6 out of 5.0

Trust Score4.6/ 5.0

Excellent

x

Data basis 96% · As of October 2026

Franconi und Grob AG scores 90.4 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.90.824%
  • 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.85.610%
  • 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.95.08%
Franconi und Grob AG 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%
Franconi und Grob AG scores 85.0 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).85.022%
Franconi und Grob AG scores 34.3 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 35.34.34%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Franconi und Grob AG reaches a ranQ Trust Score of 4.6 out of 5.0 — rated «Excellent». The rating draws, among other things, on 5.0 out of 5 stars from 28 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
5
of 5

Aggregated from 28 reviews across all connected sources

Sources
GGoogle528
★TrustpilotSoon
PProvenExpertSoon

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

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Location

Sonnenstrasse 17
2504 Biel/Bienne

At a glance

Legal form
Corporation
UID
CHE-106.199.314
Founded
1987 · 39 years
Last commercial register change
July 7, 2026
Employees
21 to 50
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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