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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,629 companies indexed · Last updated: today
DirectoryBusiness & Technical ServicesTechnical Consulting & EngineeringWinterthurB3 Kolb AG
B3 Kolb AG Logo
Verified· 2 sourcesTrust Score
Summary

About the company

B3 Kolb AG is part of the B3 group and provides engineering and construction management services. Key activities include civil and transport infrastructure, structural and timber engineering, hydraulic works, traffic planning, general planning, construction management, digital and sustainable building, and specialist expert reports and consultancy.

AI-generated
Offering

Products & services

Industry:Technical Consulting & Engineering
✓ Offered10
Earthworks and transport route construction
Transport route construction, town-centre designs, development of building land access, utility pipeline works, municipal drainage, GEP, noise protection walls and earth berms, construction surveying as well as bridge, footbridge and railway construction.
Structures and special deep foundation works
Infrastructure projects in rail, road, civil and water engineering, underpasses, culverts, retaining structures, construction pits and construction-pit closures, as well as interdisciplinary projects using BIM.
Water engineering
River and stream planning, restoration, expansion, flood protection, space for water bodies, hydraulic and hydrological analyses, numerical modelling, renaturalisation and watercourse maintenance.
Traffic planning
Operating and design concepts, traffic calming, pedestrian and cycle traffic, public transport stops, parking facilities, traffic counts, safety of school routes, mobility concepts and construction traffic management.
General planning
Planning services and project management from a single source for commercial and industrial buildings, parking structures, public transport space and town-centre designs, infrastructure projects and competition projects.
Construction management
Project and construction planning, schedule, cost and quality control, risk management, contract management, negotiations, site supervision for building and civil engineering as well as acceptance and commissioning.
Fire protection
Fire protection consulting, fire protection concepts, fire protection plans, object-specific assessments, proof-of-compliance procedures, negotiations with authorities, fire resistance documentation, quality assurance and statements.
Digital construction
BIM planning, digital construction, Virtual Design & Construction, integrated collaboration, BIM to Field, BIM Consulting, and support in planning and execution.
Sustainable construction
Sustainability analyses for projects, measures in early project phases, advice on the SIA efficiency path Energy and SNBS, and assessment of ecological, social and economic criteria.
Expert reports and consulting
Client support and representation, BIM consulting for clients, senior construction management, as well as expert reports, condition surveys, crack logs, construction phase planning and expert mandates.
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4.1/5

B3 Kolb AG

Trust & reputation

ranQ Trust Score of B3 Kolb 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.

B3 Kolb 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%
B3 Kolb AG scores 81.4 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.86.512%
  • 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.82.07%
B3 Kolb 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%
B3 Kolb AG scores 82.9 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 35.82.94%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

B3 Kolb 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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Location

Katharina-Sulzer-Platz 4
8400 Winterthur

At a glance

Legal form
Branch
UID
CHE-307.020.755
Founded
2016 · 10 years
Last commercial register change
July 6, 2021
Employees
21 to 50
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.
76.0
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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