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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,629 companies indexed · Last updated: today
DirectoryReal EstateProperty ManagementSierretz groupe SA
tz groupe SA Logo
Verified· 3 sourcesTrust Score
Summary

About the company

tz groupe SA is a carpentry and window-manufacturing company that produces windows (wood, wood‑metal, PVC, Pollux system), entrance doors and interior joinery. Its offerings also include fire- and flood-protection doors, custom interior fittings such as kitchens, staircases and furniture, and technical information on thermal, acoustic and security aspects.

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Products & services

Industry:Property Management
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tz groupe SA

5
Windows
Wood, wood-metal, PVC and Pollux windows; Structural variants, sliding, Italian-style, security and fireproof versions.
Entrance doors
Entrance doors in wood, wood-metal, PVC and Structural; fireproof and anti-flood versions.
Interior fit-out
Interior partitions, ceilings, bathrooms, kitchens, staircases, libraries, cupboards, furniture and communication doors.
Fire and anti-flood protection
EI30 fireproof windows in wood and wood-metal; anti-flood windows and doors, with certified and tested components.
Technical services for windows and doors
Water and air sealing, sound and thermal insulation, safety glass, laminated and tempered glazing, maintenance and cleaning.
Trust & reputation

ranQ Trust Score of tz groupe SA: 4.5 out of 5.0

Trust Score4.5/ 5.0

Excellent

x

Data basis 96% · As of October 2026

tz groupe SA scores 92.4 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.89.024%
  • 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.94.410%
  • 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.100.08%
tz groupe SA scores 78.3 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.83.012%
  • 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%
tz groupe SA 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%
tz groupe SA scores 40.0 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 35.40.04%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

tz groupe SA reaches a ranQ Trust Score of 4.5 out of 5.0 — rated «Excellent». The rating draws, among other things, on 4.9 out of 5 stars from 40 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
4.9
of 5

Aggregated from 40 reviews across all connected sources

Sources
GGoogle4.940
★TrustpilotSoon
PProvenExpertSoon

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

Knowledge

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Comparisons

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Location

Avenue des Platanes 21
3960 Sierre
Opening hours
Mon
08:00 - 12:00, 13:30 - 17:00
Tue
08:00 - 12:00, 13:30 - 17:00
Wed
08:00 - 12:00, 13:30 - 17:00
Thu
08:00 - 12:00, 13:30 - 17:00
Fri
08:00 - 12:00, 13:30 - 17:00
Sat
Closed
Sun
Closed

At a glance

Legal form
Corporation
UID
CHE-184.839.285
Founded
2017 · 9 years
Last commercial register change
June 9, 2020
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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