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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,629 companies indexed · Last updated: today
DirectoryConstruction & ArchitectureTimber Construction & CarpentryWalperswilE. Thomi AG
E. Thomi AG Logo
Verified· 3 sourcesTrust Score
Summary

About the company

The core activity of Thomi AG is timber construction, specifically the planning, execution and renovation of timber buildings, including element construction, exterior design, interior design, conversion and renovation, as well as the installation of Velux roof windows and roof structures.

AI-generated
Offering

Products & services

Industry:Timber Construction & Carpentry
✓ Offered8
Timber element construction
Prefabricated timber elements for new builds, storey additions and extensions; planning, structural calculations, workshop drawings, special transport and fast installation.
Conversion / renovation
Conversions and renovations of older buildings, including thermal insulation, adjustments to heating, hot water and solar power, as well as support with GEAK forms and listed / protected buildings.
Roof timber structures
Timber roof structures on masonry, with locally sourced timber, precisely cut components, transport to the construction site and subsequent installation, insulation and wooden panel works.
Exterior design
Carports, wooden terraces, balconies, façades and screw foundations; including consultation, structural calculations, workshop drawings, special transport and installation.
Interior design
Interior fit-out with wood, in particular parquet floors, wooden staircases and wall cladding; advice on wood types, design and safety requirements.
Velux roof windows
Installation of Velux roof windows for more light and fresh air in attic rooms, with professional execution and solutions for different roof situations.
Timber hall construction
Timber halls for industry, trades and agriculture, one- and two-storey; fabrication of wall and roof elements in the workshop and on-site installation.
Solid timber construction (holzius)
Ecological solid timber construction without glue and metal, implemented as a partner of holzius for single- and multi-family houses as well as commercial and tourism buildings.
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4.4/5

E. Thomi AG

Trust & reputation

ranQ Trust Score of E. Thomi AG: 4.4 out of 5.0

Trust Score4.4/ 5.0

Very high

x

Data basis 96% · As of October 2026

E. Thomi AG scores 78.7 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.81.624%
  • 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.95.08%
E. Thomi AG scores 92.3 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.82.07%
E. Thomi 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%
E. Thomi AG scores 60.0 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 35.60.04%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

E. Thomi AG reaches a ranQ Trust Score of 4.4 out of 5.0 — rated «Very high». The rating draws, among other things, on 5.0 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 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 9 reviews across all connected sources

Sources
GGoogle59
★TrustpilotSoon
PProvenExpertSoon

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

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Location

Bühlstrasse 25
3272 Walperswil
Opening hours
Mon
07:30 - 12:00, 13:15 - 17:00
Tue
07:30 - 12:00, 13:15 - 17:00
Wed
07:30 - 12:00, 13:15 - 17:00
Thu
07:30 - 12:00, 13:15 - 17:00
Fri
07:30 - 12:00, 13:15 - 16:30
Sat
Closed
Sun
Closed

At a glance

Legal form
Corporation
UID
CHE-107.206.690
Founded
1978 · 48 years
Last commercial register change
November 11, 2024
Employees
21 to 50
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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