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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,629 companies indexed · Last updated: today
DirectoryConstruction & ArchitectureBuilding ConstructionDietikonRoi & Bau GmbH
Roi & Bau GmbH Logo
Verified· 3 sourcesTrust Score
Summary

About the company

The core activity of ROI&BAU GmbH is the provision of services in the construction industry, particularly in the following areas: demolition and dismantling of buildings and facilities, excavation and earthworks, including foundation work and garden redesign, sewerage and sanitary work, including pipe laying and installation, construction work, including planning and execution of property developer projects, dry construction and interior finishing, including tile laying and flooring, tile laying and plastering. The company thus offers a comprehensive range of services in the construction industry and positions itself as a reliable construction service provider.

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Products & services

Industry:Building Construction
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3.8/5

Roi & Bau GmbH

General Contractors
Site Preparation
Flooring & Tiling
✓ Offered6
Builder's works
From building plans to the finished house, new builds and renovations, support with construction projects, forecourt, walkway and alterations within the budget.
Excavation and foundation work
Excavation and foundation work with excavators, surveying, new digging, setting foundations, and support for larger excavations.
Demolition and dismantling work
Complete demolition, dismantling, concrete cutting and excavator work for renovations or new builds, including clean and fast execution.
Sewerage system work
Pipe laying, replacing old pipes, installing new pipes, sewer system work and renovation of the installation, from rainwater drainage to the sewer.
Drywall construction
Drywall construction for new builds and renovations, implementation of interior fit-out projects and guidance during execution according to customer preferences.
Tiling and slab laying
Tiling and slab laying for new builds and renovations, floor coverings made of stone or wood, and implementation of customer requirements.
Trust & reputation

ranQ Trust Score of Roi & Bau GmbH: 3.8 out of 5.0

Trust Score3.8/ 5.0

High

x

Data basis 96% · As of October 2026

Roi & Bau GmbH scores 59.7 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.73.124%
  • 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.35.310%
  • 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%
Roi & Bau GmbH scores 65.0 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.58.012%
  • 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%
Roi & Bau GmbH 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%
Roi & Bau GmbH scores 1.7 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 35.1.74%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Roi & Bau GmbH reaches a ranQ Trust Score of 3.8 out of 5.0 — rated «High». The rating draws, among other things, on 5.0 out of 5 stars from 3 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
5
of 5

Aggregated from 3 reviews across all connected sources

Sources
GGoogle53
★TrustpilotSoon
PProvenExpertSoon

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

Knowledge

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Comparisons

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Location

Hier entsteht die Karte
Riedstrasse 14
8953 Dietikon
Opening hours
Mon
07:00 - 17:00
Tue
07:00 - 17:00
Wed
07:00 - 17:00
Thu
07:00 - 17:00
Fri
07:00 - 16:00
Sat
08:00 - 12:00
Sun
Closed

At a glance

Legal form
Limited Liability Company
UID
CHE-227.791.967
Founded
2022 · 4 years
Last commercial register change
February 19, 2026
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.
88.0
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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