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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint747,212 companies indexed · Last updated: today
DirectoryConstruction & ArchitectureRenovationUsterISP Bau GmbH
ISP Bau GmbH Logo
Verified· 3 sourcesTrust Score
Summary

About the company

ISP Bau GmbH is a construction company performing plastering, drywall and fire-protection work, carrying out exterior façade work including thermal insulation, and undertaking renovation and conversion projects. The company also provides paneling (beplanking), flocking and related services for sanitary contractors.

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Service area

Offering

Products & services

Industry:Renovation
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4.1/5

ISP Bau GmbH

Plasterer
✓ Offered4
Plastering work
Plastering, drywall and fire protection for renovations and new designs; smooth walls and ceilings, flexible interior walls, room dividers and sound as well as thermal insulation.
Facade work
External rendering, thermal insulation (ETICS/WDVS), crack repair, textured coatings as well as cleaning, plaster and painting work; including window sills and base flashing.
Conversion and renovation
Conversions, renovations and modernisation of apartments and houses; bathroom renovations, renovation of existing older buildings as well as interior and exterior painting.
Boarding and flocculation
Boarding and flocculation of ducts, service components and cavities; blown-in insulation with mineral wool, cellulose or perlite, as well as installation of stud walls and building services systems.
Trust & reputation

ranQ Trust Score of ISP Bau GmbH: 4.1 out of 5.0

Trust Score4.1/ 5.0

High

x

Data basis 96% · As of November 2026

ISP Bau GmbH scores 69.7 out of 100 points in the Reputation area of the ranQ Trust Score. This area carries 42% of the weighting.
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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.78.124%
  • 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.49.510%
  • 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.70.08%
ISP Bau GmbH scores 83.0 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.55.07%
ISP Bau GmbH scores 86.7 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).86.722%
ISP Bau GmbH scores 1.4 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 35.1.44%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

ISP Bau 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 6 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
5
of 5

Aggregated from 6 reviews across all connected sources

Sources
GGoogle56
★TrustpilotSoon
PProvenExpertSoon

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

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Comparisons

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Location

Rännenfeldstrasse 1
8610 Uster
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 - 17:00
Sat
Closed
Sun
Closed

At a glance

Legal form
Limited Liability Company
UID
CHE-114.829.382
Founded
2009 · 17 years
Last commercial register change
August 29, 2025
Employees
1 to 10

Active in 1 of 26 cantons · 1 municipality

  • ZHUster
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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