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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,887 companies indexed · Last updated: today
DirectoryConstruction & ArchitectureSpecialized Construction ActivitiesAarauZimmerli Dach- & Lukarnenbau AG
Zimmerli Dach- & Lukarnenbau AG Logo
Verified· 3 sourcesTrust Score
Summary

About the company

The core activity of Zimmerli Dach- & Lukarnenbau AG is the planning, manufacturing and installation of roof dormers as prefabricated elements, including related services such as design, consulting, clarification with authorities and delivery. In addition, the company also offers roofing work, facade and insulation work, as well as the production of side windows.

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Products & services

Industry:Specialized Construction Activities
✓ Offered6
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4.3/5

Zimmerli Dach- & Lukarnenbau AG

Roof dormers
Roof dormers as prefabricated elements, manufactured in Aarau, delivered and installed in one workday; including consultation, design, quotation, coordination with authorities, building permit application, production and installation.
Pitched roof
Pitched roofs with different designs; the page shows references and classifies this roofing system as part of the service offering for roof and dormer construction.
Flat roof
Flat roofs as a dedicated service area with reference images; offered as part of the roofing work for roof dormers and roof construction.
Roof sheet metal work
Roof sheet metal work, in particular junction and sheet metal work in connection with roof dormers and roof renovations.
Side windows
Side windows for roof dormers in various versions; as fittings for the prefabricated elements with variable materials, windows, roller shutters and louvred shutters.
Planning and building permit application for roof dormers
Personal consultation, solution proposals, design, quotation, coordination with authorities, building profile and building permit application as part of the roof dormer service package.
Trust & reputation

ranQ Trust Score of Zimmerli Dach- & Lukarnenbau AG: 4.3 out of 5.0

Trust Score4.3/ 5.0

Very high

x

Data basis 96% · As of October 2026

Zimmerli Dach- & Lukarnenbau AG scores 78.4 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.75.224%
  • 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.78.610%
  • 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.88.08%
Zimmerli Dach- & Lukarnenbau AG scores 85.5 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.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%
Zimmerli Dach- & Lukarnenbau AG scores 85.0 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).85.022%
Zimmerli Dach- & Lukarnenbau AG scores 22.9 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 35.22.94%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Zimmerli Dach- & Lukarnenbau AG reaches a ranQ Trust Score of 4.3 out of 5.0 — rated «Very high». The rating draws, among other things, on 4.6 out of 5 stars from 21 customer reviews. The data basis is 96%, so the score is backed by part of the criteria. As of October 2026.

The Trust Score cannot be bought and is calculated from publicly verifiable data.

Reviews

Aggregated rating

Aggregated rating
4.6
of 5

Aggregated from 21 reviews across all connected sources

Sources
GGoogle4.621
★TrustpilotSoon
PProvenExpertSoon

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

Knowledge

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Location

Rohrerstrasse 20
5000 Aarau

At a glance

Legal form
Corporation
UID
CHE-114.432.978
Founded
2008 · 18 years
Last commercial register change
March 2, 2010
Employees
1 to 10
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.100.06%
  • 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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