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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint746,952 companies indexed · Last updated: today
DirectoryReal EstateReal estate agentDiepoldsauSonnenbau Projekte AG
Sonnenbau Projekte AG Logo
Verified· 3 sourcesTrust Score
Summary

About the company

Sonnenbau Projekte AG provides services in real estate and construction. The company handles property sales and rentals, property management and administration, real estate valuation, and construction-related services.

AI-generated
Presence

Service area

Offering

Products & services

Industry:Real estate agent
✓ Offered7
Property sales
Property sales with research, personal advice, valuation, market information and marketing including online marketplaces, 360° tours and drone footage.
Property letting
Property letting for new-build properties, apartments, office and commercial space with property intake, rent setting, documents, viewings, credit checks, contracts and handover.
Property management
Property management for around 700 apartments, office and commercial premises and condominium ownership, including rent collection, replacement tenants, claims handling, technical management and renovation concepts.
Property valuation
Property valuation for land, single- and multi-family homes, commercial properties and special objects with free online valuation, hedonic market value assessment and detailed appraisals.
Property development
Property development for conversions, vacant commercial sites, land plots and approved projects with support through all lifecycle phases and coordination with clients, planners and authorities.
Construction management
Construction management for new builds, renovations and energy refurbishments with cost control, long-term value preservation and support for conversion and renovation concepts.
General contracting
General contracting for modern condominiums and rental apartments, turnkey new-build projects and cooperation with construction specialists for new-build realisation.
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4.2/5

Sonnenbau Projekte AG

Trust & reputation

ranQ Trust Score of Sonnenbau Projekte AG: 4.2 out of 5.0

Trust Score4.2/ 5.0

Very high

x

Data basis 96% · As of November 2026

Sonnenbau Projekte AG scores 64.7 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.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.88.08%
Sonnenbau Projekte AG scores 85.5 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.55.07%
Sonnenbau Projekte 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 Projekte AG scores 71.4 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: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Sonnenbau Projekte 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. The data basis is 96%, so the score is backed by part of the criteria. As of November 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.

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-100.959.216
Founded
1998 · 28 years
Last commercial register change
October 1, 2025
Employees
1 to 10

Active in 1 of 26 cantons · 1 municipality

  • SGDiepoldsau
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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