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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,629 companies indexed · Last updated: today
DirectoryReal EstateProperty ManagementDiepoldsauSonnenbau AG
Sonnenbau AG Logo
Verified· 4 sourcesTrust Score
Summary

About the company

Sonnenbau AG provides services in the real estate and construction sectors, with a focus on property sales, letting, management and administration, as well as property valuation and construction services. The company also offers real estate brokerage, financing support and property participation services.

AI-generated
Offering

Products & services

Industry:Property Management
✓ Offered6
Real estate marketing
Real estate marketing for properties for sale, including research, personal advice, valuation, market information and placement on online marketplaces with 360° tours and drone footage.
Real estate letting
Letting of new-build and existing properties, as well as apartments, office and commercial space, including property intake, rent setting, viewings, credit checks, lease contracts and handover.
Property management and administration
Property management and administration for apartments, office and commercial space and condominiums, including rent collection, replacement tenants, claims handling, technical management and renovation concepts.
Property valuation
Property valuation for plots, single-family homes, multi-family homes, commercial properties and special assets, including online valuation, hedonic market-value assessment and detailed reports.
Construction services
Construction services covering project management, real estate development, construction management and general contracting for new builds, renovations, refurbishments, conversions and turnkey projects.
Real estate investments
Direct and indirect real estate investments with expert advice and diversification options for investors, supplemented by a reference to casainvest.ch.
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4.2/5

Sonnenbau AG

Trust & reputation

ranQ Trust Score of Sonnenbau AG: 4.2 out of 5.0

Trust Score4.2/ 5.0

Very high

x

Data basis 100% · As of October 2026

Sonnenbau AG scores 66.0 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.45.324%
  • 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.92.510%
  • 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.95.08%
Sonnenbau 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%
Sonnenbau 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%
Sonnenbau AG scores 55.7 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 35.71.44%
  • Media authority: Quality and number of editorial mentions, weighted by the importance of the source, plus the recency of the latest high-quality mention.40.04%
Qualifications+0.00

Sonnenbau AG reaches a ranQ Trust Score of 4.2 out of 5.0 — rated «Very high». The rating draws, among other things, on 3.8 out of 5 stars from 37 customer reviews. As of October 2026.

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

Reviews

Aggregated rating

Aggregated rating
3.8
of 5

Aggregated from 37 reviews across all connected sources

Sources
GGoogle3.837
★TrustpilotSoon
PProvenExpertSoon

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

Press

Media

July 17, 2025Media
Mit Weitblick und Wurzeln
rheintal24.ch
March 4, 2025Media
CasaInvest übernimmt mehrere Immobiliengesellschaften und plant Kapitalerhöhung
rheintaler.ch
May 17, 2018Media
Wechsel bei Sonnenbau
tagblatt.ch
August 19, 2016Media
Architekt Sieber regelt Nachfolge
tagblatt.ch

Knowledge

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Comparisons

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Location

Moosstrasse 1
9444 Diepoldsau
Opening hours
Mon
07:30 - 12:00, 13:15 - 17:15
Tue
07:30 - 12:00, 13:15 - 17:15
Wed
07:30 - 12:00, 13:15 - 17:15
Thu
07:30 - 12:00, 13:15 - 17:15
Fri
07:30 - 12:00, 13:15 - 16:15
Sat
Closed
Sun
Closed

At a glance

Legal form
Corporation
UID
CHE-111.731.232
Founded
2004 · 22 years
Last commercial register change
June 16, 2025
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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