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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint746,904 companies indexed · Last updated: today
DirectoryConstruction & ArchitectureBuilding contractorBiel/BienneSIGMA BAU BIEL AG
SIGMA BAU BIEL AG Logo
Verified· 3 sourcesTrust Score
Summary

About the company

The core activity of Sigma Bau Biel AG encompasses the provision of services in the construction sector, particularly in the following segments: building construction and renovation, civil engineering, industrial construction, core drilling, sealing and injection, as well as construction management and consulting. The company thus offers a comprehensive range of construction-related services, from planning and execution of construction projects to maintenance and renovation of existing buildings.

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Service area

Offering

Products & services

Industry:Building contractor
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SIGMA BAU BIEL AG

Civil works
Excavation
✓ Offered7
Conversions / Building construction
Conversions, extensions and renovations; converting and refurbishing properties, personal advice, coordination with architects, engineers, painters and plasterers.
Civil engineering
Utility services, excavation and reinstatement work for pipe breaks, 24-hour emergency service, as well as construction and renovation of forecourts, seating areas and landscaping.
Industrial construction
Construction, conversion and maintenance projects for industrial clients; maintenance and renovation work, coordination on tight sites and during ongoing work processes, short-notice help in emergencies.
Construction management / site advisory
Preparation of construction schedules, monitoring and coordination of work steps, construction advisory from water ingress to the conversion project.
Core drilling
Core drilling in masonry, rock and concrete; drilling diameters from 20 to 300 mm, larger dimensions with partner companies, sometimes with vacuum fastening without fixing holes.
Waterproofing / injections
Waterproofing against rising damp, surface waterproofing of basement walls, sealing of leaks and cracks, repair of expansion joints and masonry grouting.
Bonded reinforcement
Structural strengthening with carbon-fibre reinforcement (CFK) and steel laminates for better utilization of the structure and higher earthquake safety.
Trust & reputation

ranQ Trust Score of SIGMA BAU BIEL AG: 4.1 out of 5.0

Trust Score4.1/ 5.0

High

x

Data basis 96% · As of November 2026

SIGMA BAU BIEL AG scores 67.3 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.67.424%
  • 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.58.610%
  • 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.78.08%
SIGMA BAU BIEL 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%
SIGMA BAU BIEL 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%
SIGMA BAU BIEL AG scores 13.4 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 35.13.44%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

SIGMA BAU BIEL AG reaches a ranQ Trust Score of 4.1 out of 5.0 — rated «High». The rating draws, among other things, on 4.4 out of 5 stars from 9 customer reviews. The data basis is 96%, 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.

Reviews

Aggregated rating

Aggregated rating
4.4
of 5

Aggregated from 9 reviews across all connected sources

Sources
GGoogle4.49
★TrustpilotSoon
PProvenExpertSoon

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

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Location

Mattenstrasse 165
2503 Biel/Bienne
Opening hours
Mon
08:00 - 12:00, 13:00 - 16:30
Tue
08:00 - 12:00, 13:00 - 16:30
Wed
08:00 - 12:00, 13:00 - 16:30
Thu
08:00 - 12:00, 13:00 - 16:30
Fri
08:00 - 12:00, 13:00 - 16:30
Sat
Closed
Sun
Closed

At a glance

Legal form
Corporation
UID
CHE-110.031.008
Founded
2003 · 23 years
Last commercial register change
January 17, 2024
Employees
1 to 10

Active in 1 of 26 cantons · 1 municipality

  • BEBiel/Bienne
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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