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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,629 companies indexed · Last updated: today
DirectoryCrafts & TradesPlumbing & Building ServicesLüchingenFranz Ulmann AG
Franz Ulmann AG Logo
Verified· 3 sourcesTrust Score
Summary

About the company

The core activity of Ulmann AG is the provision of services in the building technology sector, particularly in the areas of heating, plumbing and ventilation, including emergency services.

AI-generated
Offering

Products & services

Industry:Plumbing & Building Services
✓ Offered7
Planning & consulting
Planning of heating, ventilation, air-conditioning and sanitary systems; tender planning, execution planning, calculations, specialist site management, expert reports, GEAK, energy performance certificates and building modernisation.
Heating systems
Heating systems for new builds and existing properties; heat pumps, wood heating with split wood, wood chips or pellets, as well as oil and gas-fired burners.
Ventilation systems
Controlled home ventilation units, central ventilation systems and air distribution systems; planning, installation and implementation for healthy indoor air quality.
Air conditioning and refrigeration technology
Air-conditioning units and refrigeration lines; installation and repairs for comfortable indoor conditions and fully functioning refrigeration systems.
Sanitary installations
Sanitary installations for new builds, bathroom renovations, pipework construction, underground drain lines, compressed-air systems, water treatment and rainwater use.
Service and maintenance
Service, maintenance and repairs for heating and building-services systems; regular inspections to ensure operation.
Emergency service
24/7 emergency service for burst pipes, heating faults and other emergencies in the building-services sector.
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4.1/5

Franz Ulmann AG

Trust & reputation

ranQ Trust Score of Franz Ulmann AG: 4.1 out of 5.0

Trust Score4.1/ 5.0

High

x

Data basis 96% · As of October 2026

Franz Ulmann AG scores 64.8 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.59.424%
  • 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.49.510%
  • 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.100.08%
Franz Ulmann AG scores 87.1 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%
Franz Ulmann 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%
Franz Ulmann AG scores 22.9 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 35.22.94%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Franz Ulmann AG reaches a ranQ Trust Score of 4.1 out of 5.0 — rated «High». The rating draws, among other things, on 4.0 out of 5 stars from 6 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
of 5

Aggregated from 6 reviews across all connected sources

Sources
GGoogle46
★TrustpilotSoon
PProvenExpertSoon

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

Knowledge

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Comparisons

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Location

Eichenstrasse 13
9450 Lüchingen
Opening hours
Mon
07:00 - 11:45, 13:00 - 17:00
Tue
07:00 - 11:45, 13:00 - 17:00
Wed
07:00 - 11:45, 13:00 - 17:00
Thu
07:00 - 11:45, 13:00 - 17:00
Fri
07:00 - 11:45, 13:00 - 17:00
Sat
Closed
Sun
Closed

At a glance

Legal form
Corporation
UID
CHE-105.952.150
Founded
1982 · 44 years
Last commercial register change
March 14, 2025
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.
100.0
6%
  • Branch offices: Branch offices linked in the commercial register. Having none is normal and costs no points.85.03%
    • Full methodology

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