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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint747,212 companies indexed · Last updated: today
DirectoryConstruction & ArchitectureWindow constructionHerisauKeller + Marquart AG
Keller + Marquart AG Logo
Verified· 4 sourcesTrust Score
Summary

About the company

Keller + Marquart AG manufactures windows and entrance doors, offering individual planning, installation and service for window and door solutions. It produces locally and also carries out repairs.

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Presence

Service area

Offering

Products & services

Industry:Window construction
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4.1/5

Keller + Marquart AG

✓ Offered9
Windows
Windows in various configurations, individually planned, manufactured regionally and carefully installed; including PVC windows and PVC-aluminium windows.
Entrance doors
Custom entrance doors, individually planned, manufactured regionally and installed; complemented by suitable solutions and references for residential areas.
Sun and privacy protection
Sun and privacy protection solutions such as pleated blinds, venetian blinds and other shading elements for residential and commercial premises.
Installation
Installation of windows, doors and other building components, carried out professionally as part of the solutions offered.
Consulting
Personal consulting for window and door solutions, plus individual support during planning of the appropriate installation.
Repairs
Repairs to windows and doors, as well as restoration of existing systems and components.
Window service
Service work on windows, including maintenance and support for existing window installations.
Emergency openings & key service
Emergency openings and key service for doors and access points as an additional service.
Indoor climate
Solutions for the indoor climate in connection with windows, doors and shading.
Trust & reputation

ranQ Trust Score of Keller + Marquart AG: 4.1 out of 5.0

Trust Score4.1/ 5.0

High

x

Data basis 100% · As of November 2026

Keller + Marquart AG scores 83.7 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.79.624%
  • 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.84.710%
  • 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%
Keller + Marquart AG scores 69.5 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.50.012%
  • 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%
Keller + Marquart AG scores 88.3 out of 100 points in the Identity area of the ranQ Trust Score. This area carries 22% of the weighting.
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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).88.322%
Keller + Marquart AG scores 11.3 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 35.12.64%
  • Media authority: Quality and number of editorial mentions, weighted by the importance of the source, plus the recency of the latest high-quality mention.10.04%
Qualifications+0.00

Keller + Marquart AG reaches a ranQ Trust Score of 4.1 out of 5.0 — rated «High». The rating draws, among other things, on 4.7 out of 5 stars from 27 customer reviews. As of November 2026.

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

Reviews

Aggregated rating

Aggregated rating
4.7
of 5

Aggregated from 27 reviews across all connected sources

Sources
GGoogle4.727
★TrustpilotSoon
PProvenExpertSoon

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

Press

Media

February 1, 2022Media
3. Generation übernimmt Fensterbaufirma Keller + Marquart Herisau
appenzellerzeitung.ch

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Location

Alpsteinstrasse 16a
9100 Herisau
Opening hours
Mon
07:00 - 12:00, 13:00 - 17:00
Tue
07:00 - 12:00, 13:00 - 17:00
Wed
07:00 - 12:00, 13:00 - 17:00
Thu
07:00 - 12:00, 13:00 - 17:00
Fri
07:00 - 12:00, 13:00 - 16:00
Sat
Closed
Sun
Closed

At a glance

Legal form
Corporation
UID
CHE-175.552.117
Founded
2023 · 3 years
Last commercial register change
January 9, 2024
Employees
11 to 20

Active in 1 of 26 cantons

  • ARAppenzell Outer Rhodes
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.85.03%
    • Full methodology

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