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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,887 companies indexed · Last updated: today
DirectoryFinance & InsuranceHolding CompaniesWinterthurSISKA Immobilien AG
SISKA Immobilien AG Logo
Verified· 4 sourcesTrust Score
Summary

About the company

SISKA Immobilien AG is a real estate company that manages, acquires, develops and constructs properties. Its services include property management for residential and commercial buildings, planning and supervision of maintenance and technical renovations, and leasing and management of residential and commercial spaces including shopping centres.

AI-generated
Offering

Products & services

Industry:Holding Companies
✓ Offered3
Property management
Property and facility management and management of apartment buildings and commercial properties; support for tenants, owners' communities and condominium owners as well as planning and monitoring of maintenance and renovations.
Renting apartments and commercial spaces
Renting apartments, office and commercial premises in attractive locations; advice with property search and brokerage of suitable real estate offers.
Real estate projects
Development and marketing of new-build, conversion and renovation projects, including first lettings and new rentals in Winterthur, Zürich, St. Gallen, Grafstal, Attikon and Seuzach.
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3.9/5

SISKA Immobilien AG

Trust & reputation

ranQ Trust Score of SISKA Immobilien AG: 3.9 out of 5.0

Trust Score3.9/ 5.0

High

x

Data basis 100% · As of October 2026

SISKA Immobilien AG scores 41.9 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.0.024%
  • 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.100.010%
  • 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.95.08%
SISKA Immobilien 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%
SISKA Immobilien 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%
SISKA Immobilien AG scores 76.7 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 35.80.04%
  • Media authority: Quality and number of editorial mentions, weighted by the importance of the source, plus the recency of the latest high-quality mention.73.34%
Qualifications+0.00

SISKA Immobilien AG reaches a ranQ Trust Score of 3.9 out of 5.0 — rated «High». The rating draws, among other things, on 2.2 out of 5 stars from 93 customer reviews. As of October 2026.

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

Reviews

Aggregated rating

Aggregated rating
2.2
of 5

Aggregated from 93 reviews across all connected sources

Sources
GGoogle2.293
★TrustpilotSoon
PProvenExpertSoon

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

Press

Media

May 30, 2026Media
Siska investiert in Halle 53 in Winterthur
hochparterre.ch
March 24, 2026Media
Winterthur: Heuberger-Geschwister streiten vor Gericht um ihr Millionenerbe
tagesanzeiger.ch
December 27, 2025Media
Ein Vater, ein Imperium, drei zerstrittene Kinder: Wie ein Testament die Familie Heuberger spaltet
tagesanzeiger.ch
December 27, 2025Media
Winterthurer Immo-König: Um das Heuberger-Imperium tobt ein erbitterter Erbstreit
20min.ch
July 22, 2025Media
Illnau-Effretikon: «Effi-Märt» wird aufgestockt
immobilienbusiness.ch
July 17, 2025Media
Effi-Märt wird saniert – und vor allem umgestaltet
zo-online.ch
May 31, 2025Media
Illnau-Effretikon: Stadtrat lehnt den Kauf des Effi-Märt ab
zo-online.ch
October 11, 2024Media
Parkgebühr im Effi-Märt verdoppelt sich – auch die Migros nervt sich
blick.ch
July 2, 2020Media
Winterthur: Schlüsselübergabe für Haus Adeline Favre
immobilienbusiness.ch

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Location

Brunngasse 6
8400 Winterthur
Opening hours
Mon
08:00 - 11:30, 13:30 - 16:30
Tue
08:00 - 11:30, 13:30 - 16:30
Wed
08:00 - 11:30, 13:30 - 16:30
Thu
08:00 - 11:30, 13:30 - 16:30
Fri
08:00 - 11:30, 13:30 - 16:30
Sat
Closed
Sun
Closed

At a glance

Legal form
Corporation
UID
CHE-107.896.485
Founded
1956 · 70 years
Last commercial register change
November 5, 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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