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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,887 companies indexed · Last updated: today
DirectoryConstruction & ArchitectureBuilding MaintenanceBerneckKoster Gebäudesanierung GmbH
Koster Gebäudesanierung GmbH Logo
Verified· 3 sourcesOwner confirmed
Last updatedAugust 21, 2026
Summary

About the company

Koster Gebäudesanierung GmbH führt Gebäudesanierungen und Behandlungen an Bauoberflächen durch und spezialisiert sich auf die Entfernung sowie Behandlung von Algen, Moos und Flechten auf Dächern, Fassaden, Böden und Betonflächen. Das Unternehmen bietet zudem einen Onlineshop für Reinigungs- und Bekämpfungsmittel an und bietet Beratung sowie Schutzbehandlungen vor Ort an.

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Presence

Service area

Offering

Products & services

Industry:Building Maintenance
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Trust Score4.1/5

Koster Gebäudesanierung GmbH

Facility Management & Cleaning
✓ Offered4
Roof treatment
Roof cleaning and roof treatment against moss, algae and lichens; mechanical removal, cleaning of the gutters and spraying of the roof surface to protect the roofing covering.
Facade treatment
Facade cleaning and facade treatment against algae, moss and lichens; spraying with AGO Quart, without high pressure, with subsequent self-cleaning of the surface.
Floor treatment
Cleaning and treatment of floor surfaces such as garden slabs, concrete, natural stone and wooden terraces against algae and lichen infestation as well as slipperiness.
AGO QUART
Self-cleaning disinfecting active ingredient for exterior surfaces made of plaster, concrete, glass, stone, wood or metal; dissolves moss, algae, lichens and green growth without a high-pressure cleaner.
Expertise

Expert

MR
Marco Rutz
Managing Director
Trust & reputation

ranQ Trust Score of Koster Gebäudesanierung GmbH: 4.1 out of 5.0

Trust Score4.1/ 5.0

High

x

Data basis 96% · As of October 2026

Koster Gebäudesanierung GmbH scores 69.2 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.73.124%
  • 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.35.310%
  • 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%
Koster Gebäudesanierung GmbH scores 72.3 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.75.012%
  • 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%
Koster Gebäudesanierung GmbH scores 91.7 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).91.722%
Koster Gebäudesanierung GmbH 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

Koster Gebäudesanierung GmbH reaches a ranQ Trust Score of 4.1 out of 5.0 — rated «High». The rating draws, among other things, on 5.0 out of 5 stars from 3 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
5
of 5

Aggregated from 3 reviews across all connected sources

Sources
GGoogle53
★TrustpilotSoon
PProvenExpertSoon

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

Common questions

Answers

Which areas does Koster Building Renovation treat?
We treat roofs, facades, and floor areas such as garden slabs, concrete, natural stone, and wooden terraces. The goal is the removal of algae, moss, lichen, and green deposits. Suitable cleaning and control agents can also be found in our online shop.
How does a roof treatment work?
During the roof treatment, we first remove moss, algae, and lichens mechanically and clean the gutters. Then the roof surface is treated with a gentle spray so as not to burden the roofing material. This ensures the coating is treated sustainably.
Is high-pressure cleaning used on the facade cleaning?
No, the facade treatment is done without high pressure. We spray the facade with AGO Quart, which gradually cleans the surface itself. This protects the material and reduces the risk of damage.
What is AGO QUART and what is it used for?
AGO QUART is a self-cleaning disinfectant for outdoor surfaces. It is suitable for cleaning concrete, glass, stone, wood and metal, and removes moss, algae, mosses and green deposits. A high-pressure cleaning is not required.
Do you also offer on-site consultations?
Yes, we consult with you directly on-site and assess the appropriate treatment for your area. If desired, we also recommend protective treatments so that new growth forms more slowly. This way you receive a solution that fits your property.
Knowledge

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Contact

Location

Kobelstrasse 7
9442 Berneck

At a glance

Legal form
Limited Liability Company
UID
CHE-279.310.915
Founded
2019 · 7 years
Last commercial register change
February 14, 2019
Employees
1 to 10

Active in 11 of 26 cantons

  • AIAppenzell Inner Rhodes
  • ARAppenzell Outer Rhodes
  • GLGlarus
  • GRGrisons
  • LULucerne
  • SHSchaffhausen
  • SZSchwyz
  • SGSt. Gallen
  • TGThurgau
  • ZGZug
  • ZHZurich
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