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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,765 companies indexed · Last updated: today
DirectoryConstruction & ArchitectureBuilding ConstructionRegensdorfLeonhard Weiss Bau AG
Leonhard Weiss Bau AG Logo
Verified· 2 sourcesTrust Score
Summary

About the company

Leonhard Weiss Bau AG is a construction company providing planning and execution services for infrastructure projects. Core areas include rail engineering and track construction, road and civil engineering, turnkey construction, network construction and raw materials (asphalt, concrete), as well as structural repair and project management; the company also uses Building Information Modeling.

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Products & services

Industry:Building ConstructionCivil Engineering
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Leonhard Weiss Bau AG

General Contractors
✓ Offered12
Road and civil engineering works
Road construction, motorways, development works, earthworks and sewer construction, outdoor facilities, airfield operating surfaces and watercourse construction, natural and flood protection, landfill construction.
Railway engineering
Railway track infrastructure construction from feasibility study through planning and land acquisition negotiations to the creation of structures and responsibility for installations.
Track construction
Track conversions, new track construction, track upgrades, turnout conversions, maintenance, rail processing, track welding, platforms, level crossings and auxiliary bridges.
Infrastructure project management
Planning, traffic systems and structural engineering design, plan coordination, interface coordination, surveying, monitoring, initial site surveys and quantity calculations.
Engineering construction / Structural engineering
New build, modernization and renovation of office, residential, commercial, healthcare, bridge, tunnel, special and infrastructure buildings.
Turnkey construction
Planning, shell construction, interior fit-out, TGA, outdoor facilities and handover as a complete service for industrial, commercial, office, residential and special buildings.
Network construction
Trench-based services construction, horizontal directional drilling, pipeline construction, cable laying, cable installation, telecommunications, station construction, substations and overhead line construction.
Facility management
Operation, maintenance, upkeep, incident management, energy management, cleaning, security services, green maintenance, waste management, catering and commercial services.
Construction on existing buildings
Conversions, revitalizations and modernizations of existing buildings to preserve the fabric and increase functionality and comfort.
Structural repair and cast asphalt
Damage analyses, waterproofing, surface coating, surface protection, repair, tunnel renovation, parking area renewal, carbon concrete, corrosion protection and cast asphalt works.
Timber hybrid construction
Serial and modular timber hybrid projects for office and administrative buildings, educational and sports facilities, retail, commercial buildings, residential buildings as well as hotel and accommodation buildings.
Raw materials
Raw material extraction and processing as well as asphalt and concrete products such as asphalt base course, asphalt concrete, cast asphalt, ballast and ready-mix concrete.
Trust & reputation

ranQ Trust Score of Leonhard Weiss Bau AG: 4.1 out of 5.0

Trust Score4.1/ 5.0

High

x

Data basis 54% · As of October 2026

Without public customer reviews the score stays capped.

Leonhard Weiss 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%
Leonhard Weiss Bau AG scores 85.5 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%
Leonhard Weiss Bau AG scores 83.3 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).83.322%
Leonhard Weiss Bau AG scores 100.0 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 35.100.04%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Leonhard Weiss 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 October 2026.

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

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Secure profile

Location

Allmendstrasse 5
8105 Regensdorf

At a glance

Legal form
Corporation
UID
CHE-109.319.572
Founded
2001 · 25 years
Last commercial register change
September 23, 2022
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.
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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