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

About the company

Colak Spenglerei is a roofing and sheet-metal contracting business. Its services include work on tiled and flat roofs, façades and metal roofing, as well as roof-window installation, lightning protection, waterproofing, roof maintenance and repairs.

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Presence

Service area

Offering

Products & services

Industry:WaterproofingRoofer
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3.8/5

Colak Spenglerei

Sheet metal worker
✓ Offered11
Sheet-metal work
Sheet-metal work in all variants and sheet types, metal work on roof and facade, building sheet-metal work for new builds, conversions and refurbishment.
Roof coverings
Roof coverings for pitched and flat roofs, with tile roofs, roofing tiles, copper and other metals; consultation, planning and professional execution.
Lightning protection systems
Lightning protection systems with air-termination devices and down conductors, advice on different options and suitable offers for buildings in Basel and Basel-Land.
Waterproofing
Waterproofing for balconies and terraces against moisture, weather and frost damage, to protect the building fabric and usability of the areas.
Refurbishments
Refurbishments of balconies, terraces and flat roofs with cracks, flaking and weather-related damage, to restore safety and use.
Roof window installation and replacement
Installation and replacement of roof windows as part of work on the roof and building envelope.
Roof maintenance
Periodic roof maintenance for inspecting and maintaining roofs and roof junctions.
Liquid plastic coatings
Liquid-applied plastic coatings for waterproofing and protection of roof and outdoor surfaces.
Fall protection
Fall protection systems for work and access on roofs.
Green roofs
Green roofs as an additional service for roofs.
Roof repairs
All repairs to roofs, roof junctions and related components.
Trust & reputation

ranQ Trust Score of Colak Spenglerei: 3.8 out of 5.0

Trust Score3.8/ 5.0

High

x

Data basis 88% · As of November 2026

Colak Spenglerei scores 53.3 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.68.224%
  • 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.17.610%
  • Review recency: No data point — the criterion is taken out of the weighting and does not lower the score.—8%
Colak Spenglerei scores 75.3 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.92.512%
  • 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%
Colak Spenglerei 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%
Colak Spenglerei scores 0.9 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 35.0.94%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Colak Spenglerei reaches a ranQ Trust Score of 3.8 out of 5.0 — rated «High». The rating draws, among other things, on 5.0 out of 5 stars from 1 customer reviews. The data basis is 88%, 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 1 reviews across all connected sources

Sources
GGoogle51
★TrustpilotSoon
PProvenExpertSoon

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

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Location

Redingstr. 27
4052 Basel
Opening hours
Mon
07:30 - 19:00
Tue
07:30 - 19:00
Wed
07:30 - 19:00
Thu
07:30 - 19:00
Fri
07:30 - 19:00
Sat
Closed
Sun
Closed

At a glance

Legal form
Sole proprietorship
UID
CHE-468.571.789
Founded
2014 · 12 years
Last commercial register change
June 5, 2020
Employees
1 to 10

Active in 2 of 26 cantons · 1 municipality

  • BLBasel-Country
  • BSBasel
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.
67.0
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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