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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,701 companies indexed · Last updated: today
DirectoryConstruction & ArchitectureArchitecture FirmsZurichSeiler, Sommer
Seiler, Sommer Logo
Verified· 2 sourcesTrust Score
Summary

About the company

Seiler, Sommer is an urban design and city-planning practice offering urban modeling, development concepts, spatial data analysis, competition facilitation and masterplanning services.

AI-generated
Offering

Products & services

Industry:Architecture Firms
✓ Offered7
Urban and city planning
Urban and city-planning services for sites, districts and city quarters; development concepts, master plans, support for competitions and test planning, as well as spatial analyses and digital planning tools.
Spatial data and GIS analyses
Spatial analyses, GIS-based planning tools and data evaluations to estimate floor-area volumes, building-zone capacities, potential areas and other spatial interrelationships.
Urban Modeling
Dynamic 3D city models as decision-support tools for planning processes, with real-time updates, visualization of densification potential and use in development concepts and master plans.
Support for competitions and study mandates
Support for competitions, study mandates and test planning; clarification of objectives and interests, design of lean processes and programmes, and preparation for implementation.
Development concepts
Visions, scenarios and development concepts for sites, districts and city quarters as a basis for decision-making for long-term developments, developed participatively or directly.
Master plans
Phased implementation strategies for development concepts, including project management, as well as drafting special-use and guiding plans.
Process support for site developments
Process development, stakeholder management, political support and negotiation of urban-planning contracts to prepare site developments and infill development.
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4.1/5

Seiler, Sommer

Trust & reputation

ranQ Trust Score of Seiler, Sommer: 4.1 out of 5.0

Trust Score4.1/ 5.0

High

x

Data basis 54% · As of October 2026

Without public customer reviews the score stays capped.

Seiler, Sommer 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%
Seiler, Sommer scores 79.0 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.95.212%
  • 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%
Seiler, Sommer 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%
Seiler, Sommer scores 8.0 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 35.8.04%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Seiler, Sommer reaches a ranQ Trust Score of 4.1 out of 5.0 — rated «High». No public customer reviews are available for this provider; the rating is based on the remaining criteria. The data basis is 54%, 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.

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Location

Gutstrasse 173
8047 Zurich
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
09:00 - 17:00

At a glance

Legal form
General Partnership
UID
CHE-258.434.078
Founded
2013 · 13 years
Last commercial register change
January 13, 2017
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.
79.0
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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