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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,765 companies indexed · Last updated: today
DirectoryCrafts & TradesRoofingSteinhausenOhnsorg Verwaltung AG
Ohnsorg Verwaltung AG Logo
Verified· 3 sourcesTrust Score
Summary

About the company

The core activity of Leo Ohnsorg AG is the consulting, planning, execution and maintenance of roofing and facade work, including sheet metal work, photovoltaics and energy consulting, as well as the implementation of renovations and repairs to building envelopes.

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Offering

Products & services

Industry:RoofingSheet Metal Work
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4.3/5

Ohnsorg Verwaltung AG

✓ Offered12
Pitched roof
Advisory services, material consulting, planning and execution of pitched roofs; suitable solar systems for renovations and new builds.
Flat roof
Advisory services on the construction, planning and execution of flat roofs; suitable solar systems for office buildings, industrial buildings and older properties.
Sheet metal work
Gutters, downpipes, sheet metal roofs, sheet metal cladding, lightning protection and metal design; advice and planning for functional building protection.
Façade
Consulting on façade materials, planning and execution as well as maintenance and repair of façades; metal cladding, sealing and various building materials.
Maintenance and repair
Visual monitoring, service subscriptions, repairs and maintenance of building envelopes; treatment of storm, hail and water damage as well as PV systems.
Safety and fall protection
Planning of safety concepts as well as installation of fall protection, individual anchorage points, rope systems, rail systems, ladders and opening/penetration protection.
Personal protective equipment against falls (PSAgA)
Retaining, cover/overthrow, arrest and positioning systems; advice and sale of climbing equipment, annual maintenance and repairs.
Photovoltaics
Advisory services for PV systems, funding, planning and installation of solar systems for electricity generation on unused roof areas.
Energy consulting
Analysis and strategy, comparison of alternatives, project planning, permit procedures, funding programmes, detailed execution planning as well as site supervision and quality assurance.
GEAK / GEAK Plus
Cantonal building energy certificate with an advisory section for renewal strategy, comparison of alternatives, cost-effectiveness and funding applications.
Preparation of cost estimates
Preparation of cost estimates for construction projects; advisory services and support for public authorities, architects and construction contractors.
Advice on the building envelope
Independent advice on materials, energy efficiency and sustainable renovation for construction projects; support without an execution mandate.
Trust & reputation

ranQ Trust Score of Ohnsorg Verwaltung AG: 4.3 out of 5.0

Trust Score4.3/ 5.0

Very high

x

Data basis 96% · As of October 2026

Ohnsorg Verwaltung AG scores 77.2 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.74.624%
  • 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.74.910%
  • 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%
Ohnsorg Verwaltung 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%
Ohnsorg Verwaltung 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%
Ohnsorg Verwaltung AG scores 28.6 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 35.28.64%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Ohnsorg Verwaltung AG reaches a ranQ Trust Score of 4.3 out of 5.0 — rated «Very high». The rating draws, among other things, on 4.6 out of 5 stars from 18 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 18 reviews across all connected sources

Sources
GGoogle4.618
★TrustpilotSoon
PProvenExpertSoon

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

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Location

Bannstrasse 34
6312 Steinhausen
Opening hours
Mon
07:30 - 12:00, 13:15 - 17:00
Tue
07:30 - 12:00, 13:15 - 17:00
Wed
07:30 - 12:00, 13:15 - 17:00
Thu
07:30 - 12:00, 13:15 - 17:00
Fri
07:30 - 12:00, 13:15 - 16:30
Sat
Closed
Sun
Closed

At a glance

Legal form
Corporation
UID
CHE-105.742.954
Founded
1979 · 47 years
Last commercial register change
July 13, 2026
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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