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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint746,904 companies indexed · Last updated: today
DirectoryConstruction & ArchitectureCivil worksChamSonntag Bau AG
Sonntag Bau AG Logo
Verified· 2 sourcesTrust Score
Summary

About the company

The core activity of Sonntag Baugesellschaft is the execution of construction projects, particularly in the areas of pipeline laying, civil engineering, canal construction and sheet piling technology. The company positions itself as a partner for these specific construction services.

AI-generated
Presence

Service area

Offering

Products & services

Industry:Civil works
✓ Offered10
Pile Drilling
Pile drilling works for excavation pits, foundations and special deep construction; carried out using drilled piles as load-bearing and safety elements in the subsoil.
Civil Engineering
Civil engineering for structural construction tasks in deep construction; planning and execution of technical structures and load-bearing systems.
Special Deep Foundations
Special deep construction for demanding subsoil and securing works; supplemented by pile drilling, shoring technology and underground construction methods.
Shoring Works
Shoring works with Sheeting Technology to secure excavation pits and to stabilise earthworks in deep construction projects.
Sewer Construction
Sewer construction for drainage and wastewater systems; construction, refurbishment and restoration of pipeline and drainage systems.
Pipeline Construction
Pipeline construction; creation of pipelines and pipe systems in the subsoil, including underground construction methods.
Pipe Jacking
Pipe jacking for trenchless pipeline crossings and underground sections; carried out as a special procedure in deep construction.
Road Construction
Road construction for traffic areas and developments; execution of new road construction as part of deep construction projects.
Waste Management Technology
Waste management technology for construction and infrastructure projects; technical solutions related to waste disposal and infrastructure.
Technical Development
Technical development for special solutions and project-related further developments in the construction and deep construction sector.
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4.1/5

Sonntag Bau AG

Trust & reputation

ranQ Trust Score of Sonntag Bau AG: 4.1 out of 5.0

Trust Score4.1/ 5.0

High

x

Data basis 54% · As of November 2026

Without public customer reviews the score stays capped.

Sonntag Bau AG has no value in the Reputation area of the ranQ Trust Score because no data is available. The area carries 42% of the weighting and drops out of the calculation for this profile; it does not lower the score, only the reported data basis.
x
CriterionValueWeight
  • Review quality: No data point — the criterion is taken out of the weighting and does not lower the score.—24%
  • Review volume: No data point — the criterion is taken out of the weighting and does not lower the score.—10%
  • Review recency: No data point — the criterion is taken out of the weighting and does not lower the score.—8%
Sonntag Bau 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%
Sonntag Bau 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%
Sonntag Bau AG scores 80.0 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 35.80.04%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Sonntag Bau AG reaches a ranQ Trust Score of 4.1 out of 5.0 — rated «High». No public customer reviews are available for this provider; the rating is based on the remaining criteria. The data basis is 54%, so the score is backed by part of the criteria. As of November 2026.

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

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Location

Alte Steinhauserstrasse 19
6330 Cham

At a glance

Legal form
Corporation
UID
CHE-114.077.624
Founded
2008 · 18 years
Last commercial register change
March 6, 2024
Employees
11 to 20

Active in 1 of 26 cantons

  • ZGZug
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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