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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,887 companies indexed · Last updated: today
DirectoryReal EstateProperty ManagementWinterthurSiska Verwaltungs AG
Siska Verwaltungs AG Logo
Verified· 4 sourcesTrust Score
Summary

About the company

Siska Verwaltungs AG provides property management for residential and commercial buildings, handling leasing, rent collection, maintenance and renovations. The company also manages condominium associations and offers services for property sales and purchases, valuations, accounting and tax/legal matters.

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Offering

Products & services

Industry:Property ManagementReal Estate Brokerage
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Siska Verwaltungs AG

✓ Offered6
Real estate management
Management of residential and commercial properties, comprehensive support, debt collection, maintenance, major renovations, operations for private individuals, heirs’ communities, real estate companies and institutional investors.
Strata property management
Management of strata property for smaller communities and large developments, with transparent information, collaboration with the committee and delegates, and tailored service.
Property sales and purchases
Sale and purchase of real estate, market value assessment, marketing from A to Z, real estate capital gains tax declaration and discreet, professional handling.
Property valuations
Market value appraisals and estimates of real estate as a basis for sales, purchases and other real-estate-related decisions.
Legal and administrative services
Legal reviews of purchase objects, contract review, establishment of strata ownership, accounting for the joint-stock company, general meetings and board mandates.
Tax services
Tax matters, tax returns and support with income and wealth planning for private individuals.
Trust & reputation

ranQ Trust Score of Siska Verwaltungs AG: 3.7 out of 5.0

Trust Score3.7/ 5.0

Solid

x

Data basis 100% · As of October 2026

Siska Verwaltungs AG scores 43.6 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.5.324%
  • 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.88.08%
Siska Verwaltungs AG scores 89.3 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.70.07%
Siska Verwaltungs 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 Verwaltungs AG scores 11.5 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 35.2.94%
  • 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

Siska Verwaltungs AG reaches a ranQ Trust Score of 3.7 out of 5.0 — rated «Solid». The rating draws, among other things, on 2.9 out of 5 stars from 58 customer reviews. As of October 2026.

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

Reviews

Aggregated rating

Aggregated rating
2.9
of 5

Aggregated from 58 reviews across all connected sources

Sources
GGoogle2.958
★TrustpilotSoon
PProvenExpertSoon

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

Press

Media

January 28, 2022Media
Bauen in Winterthur – Gegen die Hochhaus-Pläne der Siska formiert sich prominenter Widerstand
tagesanzeiger.ch
February 6, 2021Media
Wie es mit Robert Heubergers Lebenswerk weitergeht
tagesanzeiger.ch

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Location

Schaffhauserstrasse 9
8400 Winterthur
Opening hours
Mon
08:00 - 12:00, 13:30 - 17:00
Tue
08:00 - 12:00, 13:30 - 17:00
Wed
08:00 - 12:00, 13:30 - 17:00
Thu
08:00 - 12:00, 13:30 - 17:00
Fri
08:00 - 12:00, 13:30 - 16:30
Sat
Closed
Sun
Closed

At a glance

Legal form
Corporation
UID
CHE-102.510.896
Founded
1972 · 54 years
Last commercial register change
July 22, 2026
Employees
11 to 20
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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