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

About the company

Diethelm Dach GmbH is a roofing and sheet-metal business specialising in flat and pitched roofs. Its services include roof waterproofing, sheet-metal work, paving, façade work, renovations, refurbishments, repairs and roof maintenance.

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Presence

Service area

Offering

Products & services

Industry:WaterproofingRoofer
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4.3/5

Diethelm Dach GmbH

Sheet metal worker
✓ Offered9
Flat Roof Work
Flat roof work for industrial buildings, terraces and balconies; consulting, planning, plastic or bituminous waterproofing, renovations, refurbishments, repairs, maintenance and 24/7 emergency service.
Pitched Roof Work
Pitched roof work for industrial buildings and roof design; work with tiles, sheet metal, fibre cement and natural slate, plus renovations, refurbishments, repairs, maintenance and 24/7 emergency service.
Sheet Metal Roofing Work
Sheet metal roofing work for flat and pitched roofs; flashings, coverings, edging, corrugated and standing-seam roofs, materials in copper, stainless steel and Matt Plus, plus repairs, maintenance and emergency service.
Tile and Slab Surfacing
Tile and slab surfacing in stone, concrete and ceramic for terraces, balconies, roof terraces and gardens; professional installation, cutting, renovations, refurbishments, repairs and service.
Liquid Waterproofing
Liquid waterproofing for flat roofs, balconies and terraces; full-surface sealing around penetrations, skylights and roof drains, including renovations, refurbishments, repairs and service.
Facade Work
Facade work for the building envelope; ventilated facades, fibre-cement facades, sheet-metal facades and aluminium elements, plus renovations, refurbishments, repairs, maintenance and service.
Roof Renovations and Refurbishments
Roof renovations and refurbishments for flat and pitched roofs; roof restoration, roof renovation, roof repairs, roof maintenance, roof inspections and roof service.
Roof Maintenance and Service
Roof maintenance and service for flat and pitched roofs; periodic inspections, small repairs, preventive maintenance and prompt correction of damage.
Emergency Roof Repairs
Emergency roof repairs for storm and hail damage on flat and pitched roofs; 24-hour availability, roof damage repairs, downpipe damage repairs and quotes for claims cases.
Trust & reputation

ranQ Trust Score of Diethelm Dach GmbH: 4.3 out of 5.0

Trust Score4.3/ 5.0

Very high

x

Data basis 96% · As of November 2026

Diethelm Dach GmbH scores 87.8 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.84.324%
  • 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.90.410%
  • 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%
Diethelm Dach GmbH scores 72.3 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.75.012%
  • 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%
Diethelm Dach 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%
Diethelm Dach GmbH scores 4.6 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 35.4.64%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Diethelm Dach GmbH reaches a ranQ Trust Score of 4.3 out of 5.0 — rated «Very high». The rating draws, among other things, on 4.8 out of 5 stars from 34 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
4.8
of 5

Aggregated from 34 reviews across all connected sources

Sources
GGoogle4.834
★TrustpilotSoon
PProvenExpertSoon

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

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Location

Alpenblickstrasse 7
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
08:00 - 14:00
Sun
Closed

At a glance

Legal form
Limited Liability Company
UID
CHE-295.423.274
Founded
2019 · 7 years
Last commercial register change
July 8, 2026
Employees
1 to 10

Active in 4 of 26 cantons

  • GLGlarus
  • SZSchwyz
  • SGSt. Gallen
  • ZHZurich
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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