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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,937 companies indexed · Last updated: today
DirectoryCrafts & TradesPlumbing & Building ServicesErmatingenM.Müller Unternehmungen AG
M.Müller Unternehmungen AG Logo
Verified· 3 sourcesTrust Score
Summary

About the company

M.Müller Unternehmungen AG provides building-services and sheet-metal roofing work, offering planning, coordination and installation of sanitary systems, heating systems and spengler (sheet-metal) works. Services listed on the website include bathroom renovations, solar systems, water softening, various heating technologies and roof and facade metalwork.

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Products & services

Industry:Plumbing & Building Services
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M.Müller Unternehmungen AG

✓ Offered
12
District heating network (Ermatingen)
Heat supply for multiple properties via an external heating center with wood chip combustion, a district heating network, transfer station and consumption-based billing.
Sanitary installations
Sanitary installations for new builds, renovations and refurbishments, including water treatment, shower systems, repairs, pipe cleaning, descaling and service coordination.
Bathroom renovation
Bathroom renovations and refurbishment, coordinated organizationally as a complete service with a single contact person for carrying out the necessary work.
Heating systems
Planning, coordination and installation of heating systems for new builds, boiler refurbishment, service, burner service, repairs and maintenance work.
Heat pumps
Heat pump systems using air, ground or water as the energy source, designed for efficient space heating and renewable heat supply.
Wood/biomass heating
Wood, pellet and chip-fired heating systems for environmentally friendly heat generation using renewable biomass as fuel.
Gas heating
Modern gas heating systems with condensing technology and modulating operation; optionally also for operation with biogas.
Oil heating
Oil-fired boilers with condensing technology for buildings where oil continues to be used as the heating solution.
Heating control
Control systems and regulators for heating systems with individual programming, operation via smartphone, tablet and laptop, as well as remote maintenance.
Sheet metal work (roofing and flashings)
Sheet metal work for gutters, downspouts, edge flashings and apron flashings, including installation, refurbishment and maintenance with various materials.
Flat roof works
Plan, install and refurbish flat roofs, including demolition, dismantling, sheet metal work, drainage, edge flashings and liquid plastic waterproofing.
Lightning protection systems
Plan and install lightning protection systems, integrated into new buildings and designed for a defined, low-resistance current path.
Trust & reputation

ranQ Trust Score of M.Müller Unternehmungen AG: 4.3 out of 5.0

Trust Score4.3/ 5.0

Very high

x

Data basis 96% · As of October 2026

M.Müller Unternehmungen AG scores 80.9 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.84.324%
  • 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.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.78.08%
M.Müller Unternehmungen 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%
M.Müller Unternehmungen AG scores 85.0 out of 100 points in the Identity area of the ranQ Trust Score. This area carries 22% of the weighting.
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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%
M.Müller Unternehmungen 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

M.Müller Unternehmungen AG reaches a ranQ Trust Score of 4.3 out of 5.0 — rated «Very high». The rating draws, among other things, on 4.9 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
4.9
of 5

Aggregated from 18 reviews across all connected sources

Sources
GGoogle4.918
★TrustpilotSoon
PProvenExpertSoon

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

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Location

Hauptstrasse 200
8272 Ermatingen
Opening hours
Mon
07:30 - 11:45, 13:15 - 17:00
Tue
07:30 - 11:45, 13:15 - 17:00
Wed
07:30 - 11:45, 13:15 - 17:00
Thu
07:30 - 11:45, 13:15 - 17:00
Fri
07:30 - 11:45, 13:15 - 16:00
Sat
Closed
Sun
Closed

At a glance

Legal form
Corporation
UID
CHE-111.713.062
Founded
2004 · 22 years
Last commercial register change
March 17, 2023
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.70.03%
    • Full methodology

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