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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,937 companies indexed · Last updated: today
DirectoryCrafts & TradesJoinerySirnachFenster Rentsch GmbH
Fenster Rentsch GmbH Logo
Verified· 3 sourcesTrust Score
Summary

About the company

The company Fenster Rentsch is a specialist for windows and front doors, distributing and installing Internorm products. The core activity of the company includes the sale and installation of windows, front doors, lift-and-slide doors and accessories, as well as consulting and planning of doors and windows.

AI-generated
Offering

Products & services

Industry:Joinery
✓ Offered9
Windows
uPVC windows, uPVC-aluminium windows, wood-aluminium windows and composite windows made to measure; various designs, versions and window accessories for new builds and renovations.
Front doors
Aluminium front doors, wood-aluminium front doors and custom-made wood front doors; with various designs, side panels, transom windows, handles and security locking systems.
Lift-and-slide doors
Lift-and-slide doors for large-area glazing; uPVC, uPVC-aluminium and wood-aluminium versions, also with electric drive and barrier-reduced thresholds.
Patio doors
Patio doors and balcony doors in uPVC, uPVC-aluminium and wood-aluminium; as turn, tilt, sliding and PSK versions, and with various threshold heights.
Sun protection
Sun protection systems for windows and façades; composite windows with integrated blinds, Raffstore, front-mounted and mini-cassette roller shutters, interior blinds and window shutters.
Insect protection
Insect protection roller blinds, hinged frames, tension frames and sliding frames made to measure; mounted directly on the window or in the roller shutter casing and adapted to site conditions.
Aluminium window shutters (Griesser AST)
Hinged and sliding aluminium shutters from Griesser AST; delivery and expert installation as a qualified specialist partner.
Installation
Professional installation of windows and doors for perfect operation, long service life and professional fitting with service.
Advice / sales
Personal advice on windows and front doors at home or in the Sirnach showroom; on-site measurements and recommendation of the right product for the building and requirements.
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3.7/5

Fenster Rentsch GmbH

Trust & reputation

ranQ Trust Score of Fenster Rentsch GmbH: 3.7 out of 5.0

Trust Score3.7/ 5.0

Solid

x

Data basis 96% · As of October 2026

Fenster Rentsch GmbH scores 42.9 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.32.124%
  • 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.40.910%
  • 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%
Fenster Rentsch GmbH scores 82.0 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.97.712%
  • 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.55.07%
Fenster Rentsch GmbH scores 83.3 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).83.322%
Fenster Rentsch GmbH scores 3.7 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 35.3.74%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Fenster Rentsch GmbH reaches a ranQ Trust Score of 3.7 out of 5.0 — rated «Solid». The rating draws, among other things, on 2.0 out of 5 stars from 4 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
2
of 5

Aggregated from 4 reviews across all connected sources

Sources
GGoogle24
★TrustpilotSoon
PProvenExpertSoon

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

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Location

Frauenfelderstrasse 49
8370 Sirnach

At a glance

Legal form
Limited Liability Company
UID
CHE-203.409.289
Founded
2012 · 14 years
Last commercial register change
July 14, 2014
Employees
1 to 10
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.
88.0
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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