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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint746,952 companies indexed · Last updated: today
DirectoryCrafts & TradesBuilding installationLachen SzBKOS GmbH
BKOS GmbH Logo
Verified· 3 sourcesTrust Score
Summary

About the company

BKOS GmbH treats and protects exposed concrete and other concrete surfaces. Its services include concrete surface repair and cosmetic treatment, cleaning, pigmentation, and concrete and graffiti protection.

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Presence

Service area

Offering

Products & services

Industry:Building installation
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4.5/5

BKOS GmbH

✓ Offered11
Concrete protection
Protect exposed concrete against water, dirt and weathering; select suitable systems with impregnation or deep hydrophobisation and match them to the substrate, exposure and appearance.
Concrete cosmetics
Cosmetic treatment of exposed concrete, correcting colour differences, aggregate pockets, spalling and defects; patching, retouching, reprofiling and colour matching.
Concrete cleaning
Clean exposed concrete in a material-appropriate way; remove mineral deposits, rust, cement film and heavy soiling, and prepare surfaces for further treatment.
Restoration of concrete surfaces
Technically assess existing concrete surfaces, restore damaged areas and visually integrate them again; treat spalling, defects, weathering and soiling.
Concrete pigmentation
Adapt and harmonise the colour of exposed concrete; pigmenting in different shades to reduce cloudiness, match joints and blend repair zones.
Graffiti protection
Preventively protect exposed concrete, stone and façade surfaces so graffiti can be removed more controllably; temporary or permanent protective systems.
Concrete imitation
Create a concrete look on suitable substrates when solid exposed concrete is not possible; handcrafted surface build-up for interior walls, retail fit-outs and conversions.
Impregnation
Protect concrete surfaces from water, dirt and moisture and make later maintenance easier; an invisible surface protection system for new or cleaned concrete surfaces.
Deep hydrophobisation
Protect weather-exposed concrete components by reducing capillary water uptake, without completely sealing the pores; for façades and exterior components.
Concrete cleaning: rust & lime removal
Remove rust stains, lime runs and mineral deposits from concrete surfaces in a controlled way; specialised cleaning for exposed concrete, façades, staircases and plinths.
Intensive concrete cleaning
Material-appropriate cleaning of heavily soiled concrete surfaces and preparation for use, cosmetic treatment or protection; suitable for final construction cleaning and heavily used areas.
Trust & reputation

ranQ Trust Score of BKOS GmbH: 4.5 out of 5.0

Trust Score4.5/ 5.0

Excellent

x

Data basis 96% · As of November 2026

BKOS GmbH scores 94.1 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.91.324%
  • 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.100.010%
  • 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%
BKOS GmbH scores 77.2 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.86.512%
  • 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%
BKOS GmbH scores 86.7 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).86.722%
BKOS GmbH scores 42.9 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 35.42.94%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

BKOS GmbH reaches a ranQ Trust Score of 4.5 out of 5.0 — rated «Excellent». The rating draws, among other things, on 4.9 out of 5 stars from 71 customer reviews. The data basis is 96%, so the score is backed by part of the criteria. As of November 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 71 reviews across all connected sources

Sources
GGoogle4.971
★TrustpilotSoon
PProvenExpertSoon

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

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Location

St. Gallerstrasse 62
8853 Lachen Sz
Opening hours
Mon
07:00 - 17:00
Tue
07:00 - 17:00
Wed
07:00 - 17:00
Thu
07:00 - 17:00
Fri
07:00 - 17:00
Sat
Closed
Sun
Closed

At a glance

Legal form
Limited Liability Company
UID
CHE-249.188.489
Founded
2016 · 10 years
Last commercial register change
July 23, 2019
Employees
1 to 10

Active in 1 of 26 cantons · 1 municipality

  • SZLachen
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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