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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,629 companies indexed · Last updated: today
DirectoryConstruction & ArchitectureBuilding ConstructionFrauenfeldErnst Herzog AG
Ernst Herzog AG Logo
Verified· 4 sourcesTrust Score
Summary

About the company

The Ernst Herzog AG company is a construction business specializing in timber construction, renovation, and locksmithing. The core activities include planning and executing construction projects, creating real estate, carrying out renovation and conversion work, as well as manufacturing wood products and locksmithing services.

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Products & services

Industry:Building ConstructionBuilding Maintenance
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4.2/5

Ernst Herzog AG

Civil Engineering
✓ Offered12
New construction
New construction of single-family homes, multi-family homes, extensions as well as commercial, industrial and hybrid buildings; including prefabrication, box elements and bridge construction.
Conversion, renovation and refurbishment
Conversion, change of use, renewal, refurbishment and renovation of single-family homes, multi-family homes, historic buildings, old barns and attic conversions.
Timber construction
Timber structures, assembly construction, element buildings, engineered timber construction, interior fit-out, wood protection, and terrace and garden solutions.
Construction company
Reinforced concrete structures, masonry work, plastering, drainage and pipeline construction, fire protection, as well as client work and small contracts.
Locksmith and blacksmith work
Metalwork, custom ironwork, structural steelwork, and processing of stainless chromium steel and aluminium.
Minor works, maintenance and repairs
Masonry work for clients, staircases, bathrooms, kitchens, water damage, window surrounds and outdoor facilities.
Plastering work
Facade plastering, crack repairs, work on historic buildings and lime plaster.
Thermal and acoustic insulation
Energy-saving measures, thermal insulation, acoustic insulation, moisture protection, and retrofitting of existing buildings, Minergie homes and passive houses.
Fire protection
Firestops, fire protective cladding, firestop joints, coatings and fire protection sleeves.
Facade works
Wood facades, plaster, exposed masonry, fibre cement, exposed concrete and wood-based materials.
Terrace and garden works
Floor grates and privacy screens for terrace and garden.
Drainage and pipeline construction
Pipelines, manholes, soakaway pipes and service lines in the ground.
Trust & reputation

ranQ Trust Score of Ernst Herzog AG: 4.2 out of 5.0

Trust Score4.2/ 5.0

Very high

x

Data basis 100% · As of October 2026

Ernst Herzog AG scores 70.8 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.72.524%
  • 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.61.010%
  • 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%
Ernst Herzog AG scores 89.8 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.89.612%
  • 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.90.07%
Ernst Herzog 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%
Ernst Herzog AG scores 22.9 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 35.25.74%
  • Media authority: Quality and number of editorial mentions, weighted by the importance of the source, plus the recency of the latest high-quality mention.20.04%
Qualifications+0.00

Ernst Herzog AG reaches a ranQ Trust Score of 4.2 out of 5.0 — rated «Very high». The rating draws, among other things, on 4.6 out of 5 stars from 10 customer reviews. As of October 2026.

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

Reviews

Aggregated rating

Aggregated rating
4.6
of 5

Aggregated from 10 reviews across all connected sources

Sources
GGoogle4.610
★TrustpilotSoon
PProvenExpertSoon

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

Press

Media

March 9, 2021Media
Nach über zehn Jahren Planung und 132 Seiten Kommentar zur Baubewilligung: Baustart am Lindenweg, dem aktuell grössten Wohnbauprojekt in Frauenfeld
thurgauerzeitung.ch
January 22, 2015Media
Dreimal Herzog auf einen Streich
thurgauerzeitung.ch

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Location

Oberwiesenstrasse 94
8500 Frauenfeld
Opening hours
Mon
07:30 - 11:30, 13:30 - 17:00
Tue
07:30 - 11:30, 13:30 - 17:00
Wed
07:30 - 11:30, 13:30 - 17:00
Thu
07:30 - 11:30, 13:30 - 17:00
Fri
07:30 - 11:30, 13:30 - 17:00
Sat
Closed
Sun
Closed

At a glance

Legal form
Corporation
UID
CHE-172.431.865
Founded
2015 · 11 years
Last commercial register change
November 30, 2015
Employees
51 to 100
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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