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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,887 companies indexed · Last updated: today
DirectoryConstruction & ArchitectureBuilding MaintenanceWinterthurFrei Bauunternehmung AG
Frei Bauunternehmung AG Logo
Verified· 3 sourcesTrust Score
Summary

About the company

The core activity of FREI Bauunternehmung AG is civil engineering, renovation and trenchless pipe laying using state-of-the-art technology, in particular through press boring, bursting lining, earth rockets and directional drilling/jet flushing. The company offers environmentally friendly methods for laying supply and disposal lines and is mainly active in the Greater Zurich Area.

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Products & services

Industry:Building MaintenanceCivil Engineering
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3.8/5

Frei Bauunternehmung AG

✓ Offered9
Civil engineering
Civil engineering works for utility lines, sewer connections and hydraulic engineering; undercrossings of roads, railways and forecourts as part of pipework and infrastructure projects.
Renovation work
Renovation and conversion work for private clients, construction companies and the public sector; demolition, alterations and extensions, plastering work, natural stone and tiling, core drilling.
Trenchless pipe construction (FREI BOHRTEC)
Trenchless installation of supply and disposal lines using pipe jacking, burst lining, earth rocket, as well as directional pipe jacking and wash boring.
Pipe jacking
Launch and reception pits, setting out of the bore, pulling in of pipes, filling injections, shafts and restoration/finishing works; underground utility crossings without damaging the surface.
Burst lining
Trenchless replacement of sewer lines or utility lines in the same alignment by splitting or bursting the existing pipes and simultaneously pulling in new pipes.
Earth rocket
Trenchless method for utility lines and service connections such as gas, water and electricity; suitable for careful undercrossings where space is limited.
Directional pipe jacking
Guided bores for service connections up to 30 m; pilot hole, reaming head and pull-in of HDPE pipes directly from the basement under the front garden.
Wash boring
Trenchless wash borings using a disassemblable system for transport to the basement; pipe pulling with water support, pipes up to 200 mm diameter and 50 m length.
24/7 picket service
Picket service for water main breaks, gas line breaks and faults in the EW network area; emergency response 24 hours a day, 365 days a year.
Trust & reputation

ranQ Trust Score of Frei Bauunternehmung AG: 3.8 out of 5.0

Trust Score3.8/ 5.0

High

x

Data basis 96% · As of October 2026

Frei Bauunternehmung AG scores 54.9 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.46.224%
  • 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.49.510%
  • 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%
Frei Bauunternehmung AG scores 67.9 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.50.012%
  • 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%
Frei Bauunternehmung 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%
Frei Bauunternehmung AG scores 57.1 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 35.57.14%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Frei Bauunternehmung AG reaches a ranQ Trust Score of 3.8 out of 5.0 — rated «High». The rating draws, among other things, on 3.3 out of 5 stars from 6 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
3.3
of 5

Aggregated from 6 reviews across all connected sources

Sources
GGoogle3.36
★TrustpilotSoon
PProvenExpertSoon

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

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Location

Hinterdorfstrasse 29
8405 Winterthur

At a glance

Legal form
Corporation
UID
CHE-134.400.935
Founded
2023 · 3 years
Last commercial register change
November 30, 2023
Employees
11 to 20
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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