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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,765 companies indexed · Last updated: today
DirectoryFinance & InsuranceHolding CompaniesZurichSIA-Haus AG
SIA-Haus AG Logo
Verified· 2 sourcesTrust Score
Summary

About the company

The core activity of Keller Unternehmungen is the management and administration of various business fields, including engineering, ImRaum, facades, and real estate. The original core business, the production and distribution of bricks, is now handled by Kubrix AG, in which Keller Unternehmungen holds a significant stake. The core activity of SIA-Haus AG is the ownership and management of the building of the same name at Selnaustrasse 16 in Zurich, which serves as the headquarters of the Swiss Engineers' and Architects' Association (SIA). The company does not operate any business and has no employees.

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Products & services

Industry:Holding Companies
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SIA-Haus AG

✓ Offered3
SIA-Haus real estate
Representative office and commercial property at Selnaustrasse 16 in Zurich, with high-rise, annex, restaurant use on the ground floor, and an underground car park.
Letting of office space
Office space in the high-rise and annex, with flexible room layouts and attractive areas on the upper floors.
Letting of catering and ancillary areas
Restaurant use on the ground floor, as well as storage, technical and underground garage areas in the building.
Trust & reputation

ranQ Trust Score of SIA-Haus AG

Trust Score

No score yet

x

A published score requires a data basis of at least 50% and data from at least two criteria groups other than identity. Missing evidence: Review quality, Review volume, Review recency, Media authority

Data basis 54% · As of October 2026

SIA-Haus AG has no value in the Reputation area of the ranQ Trust Score because no data is available. The area carries 42% of the weighting and drops out of the calculation for this profile; it does not lower the score, only the reported data basis.
x
CriterionValueWeight
  • Review quality: No data point — the criterion is taken out of the weighting and does not lower the score.—24%
  • Review volume: No data point — the criterion is taken out of the weighting and does not lower the score.—10%
  • Review recency: No data point — the criterion is taken out of the weighting and does not lower the score.—8%
SIA-Haus AG scores 85.5 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.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.55.07%
SIA-Haus AG scores 83.3 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).83.322%
SIA-Haus AG scores 0.0 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 35.0.04%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%

The data basis is 54%, below the threshold at which ranQ publishes a score. Evidence is missing for: Review quality, Review volume, Review recency, Media authority. As of October 2026.

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

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Location

Selnaustrasse 16
8002 Zurich

At a glance

Legal form
Corporation
UID
CHE-102.353.036
Founded
1967 · 59 years
Last commercial register change
July 23, 2025
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.
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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