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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,194 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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Offering

Products & services

Industry:Building Maintenance
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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
Reviews

Aggregated rating

Aggregated rating
5
of 5

Aggregated from 3 reviews across all connected sources

Sources
GGoogle53
★TrustpilotSoon
PProvenExpertSoon

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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