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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,887 companies indexed · Last updated: today
DirectoryConstruction & ArchitectureCivil Engineering FirmsRümlangIngenieurbüro Gujer AG
Ingenieurbüro Gujer AG Logo
Verified· 3 sourcesTrust Score
Summary

About the company

The core activity of Gujer AG includes engineering services and services in the field of construction and infrastructure, particularly: * Civil engineering and infrastructure (deep and road construction, sewer and pipeline construction, hydraulic engineering, concrete renovation) * Wastewater treatment and purification * Drinking water supply (drinking water intake plants, reservoir construction, general planning) * Asset management and financial and investment planning * Construction and legal services (building police, QS, fire protection, private control, BUS, neighborhood and design planning) * Surveying and geoinformation * Settlement drainage and general drainage planning. The company thus offers comprehensive services for the planning, implementation and maintenance of infrastructure projects, particularly in the field of water and wastewater.

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Products & services

Industry:Civil Engineering Firms
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Ingenieurbüro Gujer AG

✓ Offered12
Construction control
Clarifications and inspections related to construction projects from a construction-control perspective, supporting public and private clients.
QA Fire Protection
Quality assurance in fire protection for construction projects, tailored to public and private clients.
Private monitoring, operational environmental protection
Private monitoring and operational environmental protection for construction and use projects, including support with supervision and inspections.
Neighbourhood and design planning
Planning of neighbourhoods and designs to coordinate differing spatial requirements and built developments.
Area servicing
Servicing of areas with the necessary infrastructure and planning steps for construction and use.
Civil and road construction
Planning and implementation of municipal infrastructure facilities, as well as new builds and maintenance measures for cantonal main roads in the canton of Zurich.
Sewer and utility network construction
Planning and implementation of sewer and utility network projects for municipal infrastructure facilities.
Hydraulic engineering
Nature-based hydraulic engineering with projects in the field of infrastructure and watercourse design.
Concrete rehabilitation
Rehabilitation of concrete structures as part of infrastructure and preservation measures.
Finance and investment planning
Finance and investment planning for infrastructure projects and municipal facilities.
Asset preservation for urban drainage
Condition assessment, maintenance planning, rehabilitation support, and asset preservation plans for public and private sewer systems.
General drainage planning (GEP)
General drainage planning as a basis for urban drainage, maintenance, and remediation measures.
Trust & reputation

ranQ Trust Score of Ingenieurbüro Gujer AG: 4.1 out of 5.0

Trust Score4.1/ 5.0

High

x

Data basis 96% · As of October 2026

Ingenieurbüro Gujer AG scores 60.4 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.70.024%
  • 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.45.610%
  • 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.50.08%
Ingenieurbüro Gujer 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%
Ingenieurbüro Gujer 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%
Ingenieurbüro Gujer AG scores 54.3 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 35.54.34%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Ingenieurbüro Gujer AG reaches a ranQ Trust Score of 4.1 out of 5.0 — rated «High». The rating draws, among other things, on 4.6 out of 5 stars from 5 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 5 reviews across all connected sources

Sources
GGoogle4.65
★TrustpilotSoon
PProvenExpertSoon

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

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Location

Hier entsteht die Karte
Hofwisenstrasse 50a
8153 Rümlang

At a glance

Legal form
Corporation
UID
CHE-103.394.463
Founded
1998 · 28 years
Last commercial register change
June 26, 2023
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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