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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint746,952 companies indexed · Last updated: today
DirectoryCrafts & TradesRooferSisseln AgTragwerk Bernd Durach
Tragwerk Bernd Durach Logo
Verified· 2 sourcesTrust Score
Summary

About the company

The company's core activity is the provision of services and works in the field of carpentry, particularly in the areas of: energetic renovation of old buildings, roofing, complete renovation, construction of wooden terraces, dormers and skylights, sheet metal and tinplate work, interior finishing, balconies, winter gardens and terraces, dormer windows and standing seam technology, and mobile crane deployment. The company also offers consulting and planning services in these areas and places a strong emphasis on high quality and punctuality.

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Service area

Offering

Products & services

Industry:Roofer
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Tragwerk Bernd Durach

Consulting & Planning
Advisory and planning for new-build and renovation projects, coordination of suppliers and trades, preparing individual quotations and alternative proposals.
Complete Roofs
Complete roofs from one source, including roof structure, scaffolding erection, roof window work, overlay insulation and sheet-metal roofer work for new builds and conversions.
Roof Trusses
Custom carpentry for roof trusses for new builds and conversions, including both simple and complex roof structures as well as porch canopies and garage roof coverings.
Energy-Efficient Roof Renovation
Energy-efficient roof renovation with insulation and building-physics documentation, advice on subsidies and support with applications and planning.
Timber Frame Construction
Timber frame construction in element system for new builds, special-purpose construction and extensions, with high prefabrication, short installation times and efficient thermal and acoustic insulation.
Facade Renovation
Energy-efficient facade renovation with external insulation to reduce energy consumption and heating costs for facades requiring renovation.
Roof Dormers
Planning and construction of roof dormers in various designs to expand the attic with more light, space and living comfort.
Winter Gardens
Planning and construction of winter gardens attached to existing houses, with a concept, supervision from start to finish, and consideration of heat protection, ventilation and shading.
Balconies
Balconies in various designs, including board, baluster and lattice balconies, along with balcony substructures, wall formwork and wooden block walls.
Terraces
Wooden terraces with advice and planning for a warm atmosphere and an outdoor relaxation area.
Standing Seam Technique
Sheet-metal roofer and sheet-metal work in standing seam technique with copper or zinc sheet cladding for weather-resistant roof and facade solutions.
Mobile Crane Deployment
Mobile crane deployment for carpentry and roofing work, gutter cleaning, roof inspection, storm damage removal, repairs to roof overhangs and tree-care assistance.
Trust & reputation

ranQ Trust Score of Tragwerk Bernd Durach: 4.1 out of 5.0

Trust Score4.1/ 5.0

High

x

Data basis 54% · As of November 2026

Without public customer reviews the score stays capped.

Tragwerk Bernd Durach has no value in the Reputation area of the ranQ Trust Score because no data is available. The area carries 42% of the weighting and drops out of the calculation for this profile; it does not lower the score, only the reported data basis.
x
CriterionValueWeight
  • Review quality: No data point — the criterion is taken out of the weighting and does not lower the score.—24%
  • Review volume: No data point — the criterion is taken out of the weighting and does not lower the score.—10%
  • Review recency: No data point — the criterion is taken out of the weighting and does not lower the score.—8%
Tragwerk Bernd Durach 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%
Tragwerk Bernd Durach scores 85.0 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).85.022%
Tragwerk Bernd Durach scores 14.3 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 35.14.34%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Tragwerk Bernd Durach reaches a ranQ Trust Score of 4.1 out of 5.0 — rated «High». No public customer reviews are available for this provider; the rating is based on the remaining criteria. The data basis is 54%, 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.

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Location

Grossmattstrasse 18
4334 Sisseln Ag

At a glance

Legal form
Sole proprietorship
UID
CHE-154.758.417
Founded
2014 · 12 years
Last commercial register change
August 19, 2024
Employees
1 to 10

Active in 1 of 26 cantons · 1 municipality

  • AGSisseln
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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