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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint747,212 companies indexed · Last updated: today
DirectoryConstruction & ArchitectureCivil worksSt. GallenW. Dieziger AG
W. Dieziger AG Logo
Verified· 4 sourcesTrust Score
Summary

About the company

W. Dieziger AG is a civil engineering and railway construction company. Its services include excavation pits, specialist foundation engineering, sewer and utility lines, road and hydraulic engineering, demolition, recycling and contaminated-site remediation.

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Service area

Offering

Products & services

Industry:Civil works
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W. Dieziger AG

Demolition
✓ Offered3
Demolition
Partial and total demolition of buildings and industrial sites, with legally compliant disposal and safe execution.
Water engineering
Renaturation of watercourses and standing waters, as well as restoration, additions and optimization of facilities for water supply and disposal.
Alterations & special projects
Partial demolitions, building safety measures, basement construction, general conversion work and rail construction for special projects.
Trust & reputation

ranQ Trust Score of W. Dieziger AG: 4.1 out of 5.0

Trust Score4.1/ 5.0

High

x

Data basis 100% · As of November 2026

W. Dieziger AG scores 66.6 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.67.224%
  • 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.55.910%
  • 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%
W. Dieziger AG scores 89.3 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.70.07%
W. Dieziger AG scores 86.7 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).86.722%
W. Dieziger AG scores 20.5 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 35.10.94%
  • Media authority: Quality and number of editorial mentions, weighted by the importance of the source, plus the recency of the latest high-quality mention.30.04%
Qualifications+0.00

W. Dieziger AG 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 8 customer reviews. As of November 2026.

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

Reviews

Aggregated rating

Aggregated rating
4.4
of 5

Aggregated from 8 reviews across all connected sources

Sources
GGoogle4.48
★TrustpilotSoon
PProvenExpertSoon

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

Press

Media

October 13, 2021Media
Stutz übernimmt Dieziger
leaderdigital.ch
October 11, 2021Media
Stutz AG übernimmt St.Galler Bauunternehmung W. Dieziger AG
tagblatt.ch
October 8, 2021Media
Fusion auf dem Bau: Stutz AG übernimmt St.Galler Dieziger AG
tagblatt.ch

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Location

Aeplistrasse 32
9008 St. Gallen

At a glance

Legal form
Corporation
UID
CHE-103.703.771
Founded
1993 · 33 years
Last commercial register change
November 2, 2023
Employees
11 to 20

Active in 1 of 26 cantons · 1 municipality

  • SGSt. Gallen
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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