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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,629 companies indexed · Last updated: today
DirectoryConstruction & ArchitectureBuilding ConstructionSt. GallenRhomberg Bau AG
Rhomberg Bau AG Logo
Verified· 4 sourcesTrust Score
Summary

About the company

The company is active in the field of timber construction and offers solutions for building construction and infrastructure. It develops and implements sustainable projects, products and services, with a focus on ecological, social and economic sustainability.

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Offering

Products & services

Industry:Building ConstructionBuilding Maintenance
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3.9/5

Rhomberg Bau AG

Civil Engineering
General Contractors
✓ Offered11
General and total contractor
Turnkey construction for residential construction, industrial and commercial construction, hotel construction, as well as planning and execution from a single source.
Building construction
Residential construction, commercial and industrial building, exterior and forecourt design, high-rise construction sites and smaller construction tasks in building construction.
Civil engineering
Earthworks and foundation engineering, asphalt surfacing and concreting works as well as paving works for construction projects and developments.
Conversion and renovation
Conversion, renovation and refurbishment of existing buildings, residential complexes, commercial properties and private construction projects, including grant advisory.
Real estate and site development
Site search, real estate valuation and analysis, project development for residential and commercial use, as well as construction and project management.
Timber construction
Timber system construction for multi-storey residential buildings, offices, administration and commercial buildings, care and healthcare facilities, kindergartens, hotels, extensions and renovation.
Services
Property management, real estate consulting and management as well as integrated planning for the entire life cycle of real estate.
Raw materials, building materials and recycling
Deconstruction and demolition, recycling and disposal, the Hohenems quarry as well as asphalt and concrete offerings.
Rhomberg Energie
360° energy concepts, roof and façade photovoltaics, charging solutions, photovoltaic carports, and energy and load management.
Products
DAVID Microliving, Renowate, WoodRocks, Smart Balkon, ZERO and employee housing as product and system solutions.
Land asset realisation
Support for landowners in the realisation of properties and in unlocking the potential of land parcels.
Trust & reputation

ranQ Trust Score of Rhomberg Bau AG: 3.9 out of 5.0

Trust Score3.9/ 5.0

High

x

Data basis 100% · As of October 2026

Rhomberg Bau AG scores 42.5 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.17.024%
  • 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.67.110%
  • 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%
Rhomberg Bau AG scores 96.8 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.100.07%
Rhomberg Bau AG scores 86.7 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).86.722%
Rhomberg Bau AG scores 66.7 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 35.100.04%
  • Media authority: Quality and number of editorial mentions, weighted by the importance of the source, plus the recency of the latest high-quality mention.33.34%
Qualifications+0.00

Rhomberg Bau AG reaches a ranQ Trust Score of 3.9 out of 5.0 — rated «High». The rating draws, among other things, on 2.6 out of 5 stars from 13 customer reviews. As of October 2026.

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

Reviews

Aggregated rating

Aggregated rating
2.6
of 5

Aggregated from 13 reviews across all connected sources

Sources
GGoogle2.613
★TrustpilotSoon
PProvenExpertSoon

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

Press

Media

July 1, 2026Media
Amriswiler Bushof nimmt Form an: Inbetriebnahme im September
thurgauerzeitung.ch
December 16, 2021Media
Amriswil erhält eine neue Skyline. Die alte Post bleibt stehen.
tagblatt.ch

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Location

Feldlistrasse 2
9000 St. Gallen
Opening hours
Mon
08:00 - 12:00, 13:30 - 16:00
Tue
08:00 - 12:00, 13:30 - 16:00
Wed
08:00 - 12:00, 13:30 - 16:00
Thu
08:00 - 12:00, 13:30 - 16:00
Fri
08:00 - 12:00
Sat
Closed
Sun
Closed

At a glance

Legal form
Corporation
UID
CHE-112.398.997
Founded
2005 · 21 years
Last commercial register change
February 16, 2026
Employees
More than 500
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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