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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,629 companies indexed · Last updated: today
DirectoryConstruction & ArchitectureBuilding ConstructionSirnachSemi Group AG
Semi Group AG Logo
Verified· 3 sourcesTrust Score
Summary

About the company

The core activity of Semi Group AG is the provision of services in the field of building, renovation and maintenance of buildings, including painting, plastering, thermal insulation, fire protection and cleaning work, as well as the brokerage of purchase and rental properties.

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Products & services

Industry:Building Construction
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4.1/5

Semi Group AG

Building Maintenance
Painting & Plastering
✓ Offered5
Painting work
Painting of apartments, commercial buildings and facades; wallpapering and stucco work, special painting and spray techniques, as well as advice on colours and wallpaper.
Plastering and drywall construction
All types of drywall work, base, intermediate and top plaster coats, white plasters, stud walls, lining boards, suspended ceilings, as well as acoustic, sound and fire-protection systems.
Façade insulation
Façade insulation and façade systems with different materials, including advice, planning and execution for refurbishment, living comfort and energy improvement.
Renovating and refurbishing
Conversion and refurbishment of commercial and residential properties inside and out, including drywall, new plaster/render, thermal insulation, façade refurbishment and new room layout.
Fire-protection work
Firestopping, soft firestopping and rigid firestopping for pipes, cables, ventilation ducts, cable trays and fire dampers between fire compartments.
Trust & reputation

ranQ Trust Score of Semi Group AG: 4.1 out of 5.0

Trust Score4.1/ 5.0

High

x

Data basis 96% · As of October 2026

Semi Group AG scores 67.5 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.75.024%
  • 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.40.910%
  • 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%
Semi Group AG scores 80.4 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.79.212%
  • 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.70.07%
Semi Group 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%
Semi Group AG scores 71.4 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 35.71.44%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Semi Group AG reaches a ranQ Trust Score of 4.1 out of 5.0 — rated «High». The rating draws, among other things, on 5.0 out of 5 stars from 4 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 4 reviews across all connected sources

Sources
GGoogle54
★TrustpilotSoon
PProvenExpertSoon

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

Knowledge

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Location

Standbachstrasse 4
8370 Sirnach
Opening hours
Mon
07:00 - 18:00
Tue
07:00 - 18:00
Wed
07:00 - 18:00
Thu
07:00 - 18:00
Fri
07:00 - 18:00
Sat
07:00 - 12:00
Sun
Closed

At a glance

Legal form
Corporation
UID
CHE-406.352.965
Founded
2018 · 8 years
Last commercial register change
January 18, 2018
Employees
11 to 20
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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