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

About the company

Tonazzi AG is a company focused on building waterproofing and structural protection. It provides design and installation of waterproofing systems, bonded reinforcements, renovation and repair works, surface coatings and restoration services, together with project engineering.

AI-generated
Offering

Products & services

Industry:Sealing & Insulation
✓ Offered5
Building waterproofing
Waterproofing concepts, area waterproofing as well as sealing of joints and cracks; including SUPERSTOP swelling tape and tools for designers.
Bonded reinforcement
Strengthening of structures with CFK strips, steel strips, sheets/wraps, punching-shear reinforcement and fire-protection cladding; including design and installation.
Renovations and repairs
Renovation concepts and detailed planning for exposed concrete, natural stone, water-carrying cracks, leaking waterproofing as well as seamless finishes.
Coatings
Surface treatments and coatings for concrete and other substrates, for example for swimming pools, wet rooms, parking decks, drinking-water reservoirs, retention basins, flat roofs and wastewater treatment plants.
Restoration
Retouching on mineral substrates and wood, concrete cosmetics, concrete cleaning, concrete protection as well as colour and sculptural additions or imitations.
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4.2/5

Tonazzi AG

Trust & reputation

ranQ Trust Score of Tonazzi AG: 4.2 out of 5.0

Trust Score4.2/ 5.0

Very high

x

Data basis 96% · As of October 2026

Tonazzi AG scores 70.5 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.68.024%
  • 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.70.510%
  • 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%
Tonazzi AG scores 89.3 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.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.70.07%
Tonazzi 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%
Tonazzi AG scores 31.4 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 35.31.44%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Tonazzi AG reaches a ranQ Trust Score of 4.2 out of 5.0 — rated «Very high». The rating draws, among other things, on 4.4 out of 5 stars from 15 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
4.4
of 5

Aggregated from 15 reviews across all connected sources

Sources
GGoogle4.415
★TrustpilotSoon
PProvenExpertSoon

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

Knowledge

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Comparisons

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Location

Dammstrasse 2
6440 Brunnen

At a glance

Legal form
Corporation
UID
CHE-101.580.090
Founded
1992 · 34 years
Last commercial register change
February 20, 2023
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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