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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,887 companies indexed · Last updated: today
DirectoryConstruction & ArchitectureBuilding MaintenanceMellingenSera Haustechnik GmbH
Sera Haustechnik GmbH Logo
Verified· 2 sourcesTrust Score
Summary

About the company

Sera Haustechnik GmbH provides construction and trade services from a single source, including masonry and structural work, sanitary installations, plastering and painting, heating installations, and floor and wall coverings. The company supports renovation, remodeling, and new-build projects and handles planning, execution, and maintenance depending on the trade.

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Products & services

Industry:Building MaintenanceInterior Construction
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Sera Haustechnik GmbH

✓ Offered5
Civil engineering works
Civil engineering works from excavation to the completed building shell, including masonry work, concrete work, wall openings, foundation construction and structural adjustments for new builds, conversions and extensions.
Sanitary installations
Sanitary installations with planning, installation, maintenance and repair of water and wastewater pipes, fittings, toilets, showers, bathtubs and washbasins, as well as bathroom conversions.
Plastering and painting work
Plastering and painting work for indoor and outdoor areas, with smooth walls and ceilings, structure plasters, painting techniques and colours, as well as renovations of older buildings and damp walls.
Heating installations
Heating installations for conventional radiators, underfloor heating and heat pumps, including consultation, planning, installation, maintenance and fault rectification.
Floor and wall coverings
Floor and wall coverings with installation of parquet, laminate, vinyl, ceramic tiles, tiles and wall cladding, as well as preparation of the substrate and clean finishing.
Trust & reputation

ranQ Trust Score of Sera Haustechnik GmbH

Trust Score

No score yet

x

A published score requires a data basis of at least 50% and data from at least two criteria groups other than identity. Missing evidence: Review quality, Review volume, Review recency, Media authority

Data basis 54% · As of October 2026

Sera Haustechnik GmbH has no value in the Reputation area of the ranQ Trust Score because no data is available. The area carries 42% of the weighting and drops out of the calculation for this profile; it does not lower the score, only the reported data basis.
x
CriterionValueWeight
  • Review quality: No data point — the criterion is taken out of the weighting and does not lower the score.—24%
  • Review volume: No data point — the criterion is taken out of the weighting and does not lower the score.—10%
  • Review recency: No data point — the criterion is taken out of the weighting and does not lower the score.—8%
Sera Haustechnik GmbH scores 67.8 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.64.612%
  • 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%
Sera Haustechnik GmbH 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%
Sera Haustechnik GmbH scores 0.0 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 35.0.04%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%

The data basis is 54%, below the threshold at which ranQ publishes a score. Evidence is missing for: Review quality, Review volume, Review recency, Media authority. As of October 2026.

The Trust Score cannot be bought and is calculated from publicly verifiable data.

Knowledge

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Location

Stetterstrasse 60
5507 Mellingen

At a glance

Legal form
Limited Liability Company
UID
CHE-437.553.028
Founded
2021 · 5 years
Last commercial register change
January 23, 2026
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.
88.0
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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