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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,629 companies indexed · Last updated: today
DirectoryReal EstateReal Estate BrokerageSionSUMMUM SA
SUMMUM SA Logo
Verified· 3 sourcesTrust Score
Summary

About the company

The core activity of SUMMUM SA is the brokerage and management of real estate, including residential and commercial properties, in the Swiss Romandy, particularly in the canton of Valais. The activities include the sale, rental, management of real estate, as well as consulting and supporting clients in real estate transactions.

AI-generated
Offering

Products & services

Industry:Real Estate Brokerage
✓ Offered5
Real estate brokerage
Real estate brokerage for residential and commercial properties, buying and renting, houses, apartments, plots of land, and business premises in Valais.
Real estate valuation
Professional real estate valuation with market analysis in Sion and Valais, a detailed valuation report, and advice on price setting before the sale.
New-build and project sales
Marketing and sale of new-build projects and development properties, including off-plan visualisation, apartment list, and price overview.
Rental management
Rental management for apartments and houses, including dossier preparation, marketing, viewings, tenant selection, and lease contract drafting.
Commercial property sales
Sale of commercial properties and business premises in Sion and the surrounding area, including local and commercial use properties.
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4.2/5

SUMMUM SA

Trust & reputation

ranQ Trust Score of SUMMUM SA: 4.2 out of 5.0

Trust Score4.2/ 5.0

Very high

x

Data basis 96% · As of October 2026

SUMMUM SA scores 78.8 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.75.324%
  • 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.79.710%
  • 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.88.08%
SUMMUM SA scores 74.1 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.64.612%
  • 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.70.07%
SUMMUM SA scores 85.0 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).85.022%
SUMMUM SA scores 65.7 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 35.65.74%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

SUMMUM SA 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 22 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
4.6
of 5

Aggregated from 22 reviews across all connected sources

Sources
GGoogle4.622
★TrustpilotSoon
PProvenExpertSoon

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

Knowledge

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Comparisons

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Location

Rue de Loèche 22
1950 Sion
Opening hours
Mon
09:00 - 17:00
Tue
09:00 - 17:00
Wed
09:00 - 17:00
Thu
09:00 - 17:00
Fri
09:00 - 17:00
Sat
Closed
Sun
Closed

At a glance

Legal form
Corporation
UID
CHE-157.451.607
Founded
2021 · 5 years
Last commercial register change
July 24, 2025
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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