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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,887 companies indexed · Last updated: today
DirectoryCrafts & TradesMetal ConstructionWinterthurSager Haustechnik AG
Sager Haustechnik AG Logo
Verified· 3 sourcesTrust Score
Summary

About the company

The core activity of SAGER Haustechnik AG encompasses the execution of installations in the field of building technology, particularly sanitary facilities and heating systems, as well as the operation of a construction and apparatus plumbing workshop and a metal construction department. Furthermore, the company offers consulting services in the areas of energy efficiency and building physics.

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Offering

Products & services

Industry:Metal ConstructionPlumbing & Building Services
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4.3/5

Sager Haustechnik AG

Sheet Metal Work
✓ Offered9
Sanitary consultation and sanitary project planning
Advice for sanitary installations in residential construction, including project planning, standards checks, and design of fittings, ventilation, and bathroom solutions.
Sanitary installation and execution
Installation of water, waste water, gas, and compressed-air lines as well as mounting of fittings and appliances, including flushing, balancing, and commissioning.
Bathroom renovation and refurbishment
Renovation and refurbishment of bathrooms for private clients in single- and multi-family homes, with complete solutions tailored to design, budget, and technology.
Sanitary maintenance and value preservation
Maintenance and value-preserving work on sanitary installations, including functional testing, descaling, clearing blockages, replacing defective components, and ensuring drinking water hygiene.
Heating consultation and heating planning
Advice on selecting the heat generator and planning heating systems, including demand analysis, sizing, calculations, and taking account of technical standards.
Heating installation and execution
Installation of heating systems with site setup, material delivery, installation work, coordination with other trades, documentation, commissioning, and instruction.
Renewable heating systems
Planning and implementation of heat pumps, wood heating systems, district heating connections, and solar installations for renewable heating with low operating costs.
Heat pumps
Heat pump systems for air, ground, and groundwater, implemented according to FWS specifications and considering technology, regulations, and costs.
Maintenance and upkeep of heating systems
Maintenance of heating systems with leak testing, replacement of leaking valves and pumps requiring revision, rebalancing, and condition monitoring.
Trust & reputation

ranQ Trust Score of Sager Haustechnik AG: 4.3 out of 5.0

Trust Score4.3/ 5.0

Very high

x

Data basis 96% · As of October 2026

Sager Haustechnik AG scores 78.9 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.77.024%
  • 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.70.510%
  • 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%
Sager Haustechnik 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%
Sager Haustechnik AG scores 83.3 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).83.322%
Sager Haustechnik AG scores 17.1 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 35.17.14%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Sager Haustechnik AG reaches a ranQ Trust Score of 4.3 out of 5.0 — rated «Very high». The rating draws, among other things, on 4.7 out of 5 stars from 15 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
4.7
of 5

Aggregated from 15 reviews across all connected sources

Sources
GGoogle4.715
★TrustpilotSoon
PProvenExpertSoon

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

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Location

Wässerwiesenstrasse 53
8408 Winterthur
Opening hours
Mon
07:00 - 12:00, 13:00 - 17:00
Tue
07:00 - 12:00, 13:00 - 17:00
Wed
07:00 - 12:00, 13:00 - 17:00
Thu
07:00 - 12:00, 13:00 - 17:00
Fri
07:00 - 12:00, 13:00 - 16:00
Sat
Closed
Sun
Closed

At a glance

Legal form
Corporation
UID
CHE-103.505.314
Founded
1996 · 30 years
Last commercial register change
April 22, 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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