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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,544 companies indexed · Last updated: today
DirectoryBusiness & Technical ServicesTechnical Consulting & EngineeringRomanshornB3 Kolb AG
B3 Kolb AG Logo
Verified· 2 sourcesTrust Score
Summary

About the company

B3 Kolb AG is an engineering and construction management firm offering general planning, construction management and specialist consulting. Its services cover civil and transport engineering, structural engineering (concrete, steel and timber), water engineering, traffic planning, digital construction and sustainable building.

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Offering

Products & services

Industry:Technical Consulting & Engineering
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B3 Kolb AG

✓ Offered12
Road and traffic infrastructure construction
Creative solutions for roads, traffic routes and settlements; town centre design, access development, utility line construction, municipal drainage, GEP, bridges, footbridges and railway construction as well as noise protection measures.
Special structures and deep foundation works
Planning of load-bearing structures and infrastructure works; underpasses, culverts, retaining structures, excavation pits and pit closures, as well as complex projects in rail, road, civil and water engineering.
Water engineering
Analysis, planning and implementation of river and stream courses, rehabilitation and upgrades; flood protection, river space, modelling, natural hazard analyses, renaturation and watercourse maintenance.
Traffic planning
Operations and design concepts, traffic calming, pedestrian and cycle traffic, public transport stops, parking facilities, traffic counts, safe routes to school, mobility concepts and construction site traffic management.
General planning
Planning services and project management from a single source; studies, execution through commissioning, interdisciplinary projects, commercial, industrial and traffic-area projects, infrastructure and competition projects.
Construction management
Project and construction planning, schedule, cost and quality control, risk management, contract management, negotiations, site supervision, as well as acceptance and commissioning in building and civil engineering.
Masonry and steel construction
Structural engineering from concept to realization, new builds and conversions, economical structural concepts, material selection, condition assessments, structural checks and BIM-supported execution planning.
Timber construction
Competitions, preliminary clarifications, feasibility studies, structural design, structural sizing, detailed planning, production and assembly planning, material lists, as well as construction inspection and BIM application.
Digital construction
BIM planning, digital construction, Virtual Design & Construction, integrated collaboration, BIM to Field, agile project execution, and BIM consulting for design offices and contractors.
Fire protection
Fire protection consulting, fire protection concepts and plans, property-specific assessments, verification procedures, authority meetings, fire resistance proof, quality assurance, statements and expert reports.
Sustainable construction
Analysis and consulting for sustainable construction projects; assessment of emissions, socially compatible and cost-effective concepts, sustainability analyses, and development of measures in line with SIA and SNBS.
Expertises and consulting
Client support and representation, BIM consulting, senior site management, as well as expert reports, inventory surveys, crack records, construction phase planning, expert mandates, and assessments of existing structures.
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 95.5 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.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

Hafenstrasse 62
8590 Romanshorn

At a glance

Legal form
Corporation
UID
CHE-108.211.995
Founded
1998 · 28 years
Last commercial register change
July 2, 2025
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.
100.0
6%
  • Branch offices: Branch offices linked in the commercial register. Having none is normal and costs no points.100.03%
    • Full methodology

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