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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,629 companies indexed · Last updated: today
DirectoryConstruction & ArchitectureCivil Engineering FirmsIllnauBJ Partner AG
BJ Partner AG Logo
Verified· 3 sourcesTrust Score
Summary

About the company

The core activity of BJ Partner AG is the provision of services in the field of structural engineering, particularly in structural planning, conversions and excavations, as well as in fire protection planning. The company offers its services as civil engineers and planners and specializes in the planning and execution of projects in the Zurich area.

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Products & services

Industry:Civil Engineering Firms
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3.9/5

BJ Partner AG

9
Structural engineering design
Structural engineering design for concrete, steel and timber construction; from planning to implementation of sustainable, functional and cost-effective solutions for construction projects of any size.
New builds and renovations
New builds and renovations from concept to completion, for residential construction, public buildings, commercial activities, industry and infrastructure.
Special foundation works and excavation pits
Special foundation works and excavation pits with geotechnical solutions, pile foundations, excavation supports, excavation and dewatering concepts.
Seismic assessments and strengthening
Seismic assessments and targeted strengthening measures with sound design calculations and reinforcements for existing structures.
Condition assessments and repairs
Condition assessments and repairs for the preservation and refurbishment of existing structures.
Protective structures
Design of protective rooms according to TWK, including a reviewable report.
Fire protection
Fire protection planning, quality assurance up to QSS2 and specialist services for timber construction.
Design competitions and study assignments
Design competitions and study assignments with concepts and designs for construction projects.
Expert reports
Expert reports with expert assessments and advisory services for well-founded decisions.
Trust & reputation

ranQ Trust Score of BJ Partner AG: 3.9 out of 5.0

Trust Score3.9/ 5.0

High

x

Data basis 96% · As of October 2026

BJ Partner AG scores 63.5 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.73.124%
  • 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.35.310%
  • 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.70.08%
BJ Partner AG scores 70.4 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.64.612%
  • 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%
BJ Partner 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%
BJ Partner AG scores 3.7 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 35.3.74%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

BJ Partner AG reaches a ranQ Trust Score of 3.9 out of 5.0 — rated «High». The rating draws, among other things, on 5.0 out of 5 stars from 3 customer reviews. The data basis is 96%, 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.

Reviews

Aggregated rating

Aggregated rating
5
of 5

Aggregated from 3 reviews across all connected sources

Sources
GGoogle53
★TrustpilotSoon
PProvenExpertSoon

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

Knowledge

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Comparisons

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Location

Weisslingerstrasse 17
8308 Illnau
Opening hours
Mon
07:00 - 12:00, 13:00 - 17:00
Tue
07:00 - 12:00, 13:00 - 17:00
Wed
07:00 - 12:00, 13:00 - 17:00
Thu
07:00 - 12:00, 13:00 - 17:00
Fri
07:00 - 12:00, 13:00 - 17:00
Sat
Closed
Sun
Closed

At a glance

Legal form
Corporation
UID
CHE-315.772.194
Founded
2021 · 5 years
Last commercial register change
June 5, 2023
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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