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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,765 companies indexed · Last updated: today
DirectoryConstruction & ArchitectureTimber Construction & CarpentryThalheim AgTheo Wernli AG
Theo Wernli AG Logo
Verified· 4 sourcesTrust Score
Summary

About the company

The core activity of Theo Wernli AG is the production and assembly of windows, wood construction and carpentry. Specifically, this includes the manufacture and assembly of window systems, front doors, interior doors, built-in cabinets and other wood products. The company also offers services such as window renovations, disassembly and assembly of windows and doors.

AI-generated
Offering

Products & services

Industry:Timber Construction & Carpentry
✓ Offered12
Window construction
Window production, delivery and installation of windows for new builds and renovations; various window types, window renovations in existing buildings, service and maintenance.
Timber construction
Timber construction for conversions and new builds, timber element houses, storey additions as well as extensions and conversions of existing buildings; planning and building according to your wishes.
Joinery
Building joinery work, cutting to size for timber construction, exterior cladding, lintel and sill boards; front doors, interior doors, built-in cupboards, cloakroom furniture and kitchens.
Window production
Own production of wooden and wood-metal windows in Thalheim; processing, gluing, surface treatment and assembly of all variants and sizes.
Delivery & installation
Delivery and professional installation of windows by trained fitters for new builds and renovations as well as existing buildings.
Window renovations
Renovation of windows in existing buildings, including replacement and adjustment as part of window construction.
Roof windows
Installation and fitting of roof windows in timber construction.
Storey additions and extensions
Storey additions as well as extensions and conversions of existing buildings in timber construction.
Roof dormers
Planning and execution of roof dormers in timber construction.
Doors & gates
Manufacture and installation of front doors, interior doors and gates in the joinery shop.
Wardrobes
Built-in wardrobes and other cupboard solutions from the joinery shop.
Solid wood furniture
Solid wood furniture from the joinery shop, made to measure and installed.
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4.5/5

Theo Wernli AG

Trust & reputation

ranQ Trust Score of Theo Wernli AG: 4.5 out of 5.0

Trust Score4.5/ 5.0

Excellent

x

Data basis 100% · As of October 2026

Theo Wernli AG scores 88.0 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.85.124%
  • 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.95.110%
  • 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.88.08%
Theo Wernli 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%
Theo Wernli 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%
Theo Wernli AG scores 42.2 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 35.54.34%
  • Media authority: Quality and number of editorial mentions, weighted by the importance of the source, plus the recency of the latest high-quality mention.30.04%
Qualifications+0.00

Theo Wernli AG reaches a ranQ Trust Score of 4.5 out of 5.0 — rated «Excellent». The rating draws, among other things, on 4.8 out of 5 stars from 41 customer reviews. As of October 2026.

The Trust Score cannot be bought and is calculated from publicly verifiable data.

Reviews

Aggregated rating

Aggregated rating
4.8
of 5

Aggregated from 41 reviews across all connected sources

Sources
GGoogle4.841
★TrustpilotSoon
PProvenExpertSoon

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

Press

Media

April 23, 2023Media
Gewerbeverein Schenkenbergertal feiert 40-Jahr-Jubiläum
aargauerzeitung.ch
July 27, 2022Media
Thalheim: Theo Wernli AG strukturiert Betrieb um
aargauerzeitung.ch
March 22, 2022Media
«Regionaler geht es wirklich nicht»
nfz.ch
January 29, 2016Media
38 Jahre bei der Theo Wernli AG
solothurnerzeitung.ch

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Location

Hegi 300
5112 Thalheim Ag
Opening hours
Mon
07:30 - 12:00, 13:00 - 17:00
Tue
07:30 - 12:00, 13:00 - 17:00
Wed
07:30 - 12:00, 13:00 - 17:00
Thu
07:30 - 12:00, 13:00 - 17:00
Fri
07:30 - 12:00, 13:00 - 16:00
Sat
Closed
Sun
Closed

At a glance

Legal form
Corporation
UID
CHE-115.771.147
Founded
2010 · 16 years
Last commercial register change
May 17, 2021
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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