ranQ
ranQ
ranQ
DirectoryIndustriesPlacesKnowledgeComparisonsSoon
Sign inCheck visibility
ranQHSG Startup LabelRecognised by the
HSG Startup Label

The leading AI company directory, built to boost AI visibility.

DEENFRIT
Product
  • Pricing
  • Directory
  • Industries
  • Trust Score
Company
  • About
  • Partner program
  • Contact
  • Legal
© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint747,212 companies indexed · Last updated: today
DirectoryConstruction & ArchitectureWaterproofingBaselA1 Flachdach GmbH
A1 Flachdach GmbH Logo
Verified· 3 sourcesTrust Score
Summary

About the company

A1 Flachdach GmbH plans, constructs, insulates and waterproofs flat roofs. Its services include waterproofing with bitumen, plastic membranes and liquid-applied plastics, as well as roof renovations, repairs, green roofs and work on balconies, terraces and below-ground areas.

AI-generated
Presence

Service area

Offering

Products & services

Industry:Waterproofing
✓ Offered
LeadhubOutbound Leads by COHAGA

Looking for direct email addresses and phone numbers?

Leadhub delivers verified contact details and decision-makers from over 750,000 Swiss companies — management, procurement, marketing, HR.

Discover Leadhub
3.7/5

A1 Flachdach GmbH

6
Flat roof waterproofing
Flat roof waterproofing with bitumen membranes, PVC sheets or liquid plastics; for new builds, existing roofs and permanently watertight installations against moisture and weather.
Service and repairs
Inspections, maintenance work, repairs and emergency services for flat roofs; to remedy damage and maintain function and safety.
Green roof systems
Extensive and intensive green roofs for flat roofs; advice on planning and design as well as implementation according to local regulations and standards.
Fall protection (construction securers)
Professional fall protection anchor installations for construction companies and building owners; for fall protection on construction sites and flat roofs.
Balcony and terrace waterproofing
Waterproofing for balconies and terraces with bitumen-based or plastic-based membranes; long-term protection against moisture and dampness.
Subterranean waterproofing
Bitumen-based waterproofing for subterranean structures, building connections and flat roof connections; protection for door, window, floor and wall connections against moisture and water.
Trust & reputation

ranQ Trust Score of A1 Flachdach GmbH: 3.7 out of 5.0

Trust Score3.7/ 5.0

Solid

x

Data basis 96% · As of November 2026

A1 Flachdach GmbH scores 56.5 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: 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%
A1 Flachdach GmbH scores 61.5 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.50.012%
  • 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%
A1 Flachdach 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%
A1 Flachdach GmbH scores 0.3 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 35.0.34%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

A1 Flachdach GmbH reaches a ranQ Trust Score of 3.7 out of 5.0 — rated «Solid». The rating draws, among other things, on 5.0 out of 5 stars from 1 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 1 reviews across all connected sources

Sources
GGoogle51
★TrustpilotSoon
PProvenExpertSoon

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

Knowledge

No knowledge articles yet

Once A1 Flachdach GmbH has claimed this profile, we'll publish editorial articles and case studies here together.

Get started
Comparisons

A1 Flachdach GmbH in comparison

Soon

Industry comparisons are coming soon

We're preparing industry comparisons that rank A1 Flachdach GmbH by reviews, experience and specialisations.

Is this your company?

Claim the company profile of A1 Flachdach GmbH to make its contact details visible. With a plan we additionally create and publish industry comparisons, articles and much more.

Secure profile

Location

Spalenring 17
4055 Basel
Opening hours
Mon
07:00 - 20:00
Tue
07:00 - 20:00
Wed
07:00 - 20:00
Thu
07:00 - 20:00
Fri
07:00 - 20:00
Sat
Closed
Sun
Closed

At a glance

Legal form
Limited Liability Company
UID
CHE-186.552.765
Founded
2023 · 3 years
Last commercial register change
March 15, 2024
Employees
1 to 10

Active in 1 of 26 cantons · 1 municipality

  • 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.
88.0
6%
  • Branch offices: Branch offices linked in the commercial register. Having none is normal and costs no points.70.03%
    • Full methodology

    Similar companies

    AD
    AM Dach - Bau System GmbH
    Basel
    HA
    H.M Abdichtung GmbH
    Basel
    ID
    IKA DachWelt GmbH
    Basel
    DG
    DRIM GmbH
    Basel
    CS
    Colak Spenglerei
    Basel
    PB
    Planex Bau GmbH
    Basel
    MA
    Morath AG
    Basel
    NI
    NeRa Isolierungen GmbH
    Basel