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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,887 companies indexed · Last updated: today
DirectoryConstruction & ArchitectureBuilding MaintenanceSt. UrsenFahrni UmBau GmbH
Fahrni UmBau GmbH Logo
Verified· 3 sourcesTrust Score
Summary

About the company

The core activity of Gasser Bohrungen GmbH is the execution of drilling, milling and masonry work, in particular core drilling, as well as the rental of machines for these activities.

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Offering

Products & services

Industry:Building MaintenanceSite Preparation
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4.1/5

Fahrni UmBau GmbH

Masonry Work
✓ Offered9
Core drilling
Core drilling through concrete, masonry and reinforced concrete, precise, low-vibration and to exact dimensions; openings for pipes, conduits, cables and ventilation systems up to 600 mm in diameter.
Milling and wall sawing
Milling and wall sawing through concrete, reinforced concrete and masonry for new openings such as passages, windows and stair openings, as well as openings in walls and ceilings up to 42 cm wall thickness.
Conversions
Conversions in indoor and outdoor areas, including adjustments to living spaces, removing tiles, removing or installing walls, and works related to changes to heating systems.
Structural reinforcement
Structural reinforcement during conversions, for example by installing steel beams or bonding CFRP laminates, to secure the static structural system of buildings.
Excavator work
Excavator work for utility line construction, digging, stripping topsoil (humus) and building natural stone walls.
Masonry work
Masonry work such as bricklaying, installing lintels, concreting the floor, concreting the wall, trowel finishing with a wing float and various retaining walls.
Concrete demolition
Controlled, professional concrete demolition for conversion and construction projects.
Renovations
Renovations and conversions in indoor or outdoor areas to enhance owner-occupied homes.
Rental of machines
Rental of excavators, tarpaulin trailers, tip trailers, cutting saws, pointed hammers, vibrating plates, leveling lasers, earth augers, dirty water pumps and fan heaters, partly with or without operator.
Trust & reputation

ranQ Trust Score of Fahrni UmBau GmbH: 4.1 out of 5.0

Trust Score4.1/ 5.0

High

x

Data basis 96% · As of October 2026

Fahrni UmBau GmbH scores 72.8 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.79.424%
  • 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.52.910%
  • 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.78.08%
Fahrni UmBau GmbH scores 83.0 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%
Fahrni UmBau GmbH 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%
Fahrni UmBau GmbH 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

Fahrni UmBau GmbH reaches a ranQ Trust Score of 4.1 out of 5.0 — rated «High». The rating draws, among other things, on 5.0 out of 5 stars from 7 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 7 reviews across all connected sources

Sources
GGoogle57
★TrustpilotSoon
PProvenExpertSoon

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

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Location

Stöck 5
1717 St. Ursen
Opening hours
Mon
07:00 - 12:00, 13:00 - 17:00
Tue
07:00 - 12:00, 13:00 - 17:00
Wed
07:00 - 12:00, 13:00 - 17:00
Thu
07:00 - 12:00, 13:00 - 17:00
Fri
07:00 - 12:00, 13:00 - 17:00
Sat
Closed
Sun
Closed

At a glance

Legal form
Limited Liability Company
UID
CHE-113.724.102
Founded
2007 · 19 years
Last commercial register change
August 13, 2026
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.
88.0
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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