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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,629 companies indexed · Last updated: today
DirectoryConstruction & ArchitectureCivil Engineering FirmsSt. GallenERR AG
ERR AG Logo
Verified· 3 sourcesTrust Score
Summary

About the company

ERR AG offers spatial planning and urban design services, preparing planning instruments such as concepts, sectoral and zoning plans, special‑use plans and managing variance, competition and study procedures. The firm also delivers mobility concepts, traffic and noise assessments, environmental analyses and operational/design concepts for public spaces.

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Products & services

Industry:Civil Engineering Firms
✓ Offered5
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ERR AG

Spatial development
Spatial development, concepts and strategies, regional framework plans, land-use framework plans, special-use plans, land readjustments, as well as protection plans and regulations for cantons, regions, municipalities and neighbourhoods.
Variance procedures
Variance procedures for competitions, study mandates, test planning and workshop processes; support for process design, development of inputs for specialist offices and the jury, and transparent implementation.
Mobility and environment
Mobility concepts, access and servicing plans, traffic assessments, pedestrian and cycle traffic planning, operational and design concepts, design of public spaces, as well as noise impact assessments.
Urban planning
Local and urban-planning studies, guiding visions, design concepts and advisory services for individual projects, including in protected townscape areas; assessment of the spatial impacts of planning measures.
Sustainability
Assessment and development of solutions with regard to ecological, economic and social aspects; considering sustainability in smaller and larger external projects.
Trust & reputation

ranQ Trust Score of ERR AG: 4.2 out of 5.0

Trust Score4.2/ 5.0

Very high

x

Data basis 96% · As of October 2026

ERR AG scores 65.3 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.67.924%
  • 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.40.910%
  • 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%
ERR AG scores 90.2 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.82.07%
ERR AG 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%
ERR AG scores 74.3 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 35.74.34%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

ERR AG reaches a ranQ Trust Score of 4.2 out of 5.0 — rated «Very high». The rating draws, among other things, on 4.5 out of 5 stars from 4 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
4.5
of 5

Aggregated from 4 reviews across all connected sources

Sources
GGoogle4.54
★TrustpilotSoon
PProvenExpertSoon

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

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Location

Teufener Strasse 19
9000 St. Gallen
Opening hours
Mon
08:00 - 11:45, 13:00 - 17:00
Tue
08:00 - 11:45, 13:00 - 17:00
Wed
08:00 - 11:45, 13:00 - 17:00
Thu
08:00 - 11:45, 13:00 - 17:00
Fri
08:00 - 11:45, 13:00 - 16:00
Sat
Closed
Sun
Closed

At a glance

Legal form
Corporation
UID
CHE-204.756.782
Founded
2013 · 13 years
Last commercial register change
July 4, 2025
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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