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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,629 companies indexed · Last updated: today
DirectoryCrafts & TradesRoofingRorschachStreule & Alder AG
Streule & Alder AG Logo
Verified· 4 sourcesTrust Score
Summary

About the company

Streule & Alder AG provides building-envelope and roofing services, offering pitched and flat roofs, façade work, solar installations, sheet-metal (spenglerei) services, crane operations, sandblasting, energy consulting and maintenance.

AI-generated
Offering

Products & services

Industry:Roofing
✓ Offered8
Pitched roof
Plan and execute pitched roofs with vapour barrier, thermal insulation, underlay and roof covering; also wooden shingles and renovations.
Flat roof
Execute and renovate flat roofs, gravelled, earth-covered, greened or accessible with slabs; including execution of various variants.
Solar
Plan and install solar systems, including provision of safe and clean energy from the building’s own roof, as well as proper disposal.
Sheet metal work
Sheet metal work on the building envelope, from connections and flashings to all jobs arising around the roof.
Crane work
Crane work for construction and roof projects, as a support service for installation, lifting and transport work.
Sandblasting
Sandblasting for cleaning and pre-treatment of old structures and weathered façades, so that a new paint coating is possible.
Energy consulting
Energy consulting for building envelope and renovation projects, as support for planning and implementation of energy-related measures.
Service + maintenance
Service and maintenance work for properties, including maintenance subscription and damage reporting for ongoing support and response cases.
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4.2/5

Streule & Alder AG

Trust & reputation

ranQ Trust Score of Streule & Alder AG: 4.2 out of 5.0

Trust Score4.2/ 5.0

Very high

x

Data basis 100% · As of October 2026

Streule & Alder AG scores 69.8 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.65.024%
  • 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.74.910%
  • 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.78.08%
Streule & Alder AG scores 90.9 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.70.07%
Streule & Alder AG 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%
Streule & Alder AG scores 44.3 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 35.68.64%
  • Media authority: Quality and number of editorial mentions, weighted by the importance of the source, plus the recency of the latest high-quality mention.20.04%
Qualifications+0.00

Streule & Alder AG reaches a ranQ Trust Score of 4.2 out of 5.0 — rated «Very high». The rating draws, among other things, on 4.3 out of 5 stars from 18 customer reviews. As of October 2026.

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

Reviews

Aggregated rating

Aggregated rating
4.3
of 5

Aggregated from 18 reviews across all connected sources

Sources
GGoogle4.318
★TrustpilotSoon
PProvenExpertSoon

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

Press

Media

March 6, 2022Media
«Eine einmalige Erfahrung»: Vier Mitarbeiter der Streule + Alder AG in Rorschach reparierten ein Spitaldach in Senegal
tagblatt.ch
February 21, 2022Media
Streule + Alder-Crew ist im Senegal angekommen
rorschacherecho.ch
January 13, 2021Media
Alder AG übergibt Dachdeckerbetrieb an Streule + Alder AG
appenzellerzeitung.ch
November 19, 2019Media
Raiffeisenbank ehrt den Sieger des Publikumspreises
rorschacherecho.ch
May 25, 2018Media
Streule + Alder AG starten in das Festwochenende
rorschacherecho.ch

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Location

Blumenstrasse 24
9400 Rorschach
Opening hours
Mon
08:00 - 12:00, 13:00 - 17:00
Tue
08:00 - 12:00, 13:00 - 17:00
Wed
08:00 - 12:00, 13:00 - 17:00
Thu
08:00 - 12:00, 13:00 - 17:00
Fri
08:00 - 12:00, 13:00 - 17:00
Sat
Closed
Sun
Closed

At a glance

Legal form
Corporation
UID
CHE-107.526.172
Founded
1993 · 33 years
Last commercial register change
July 17, 2023
Employees
11 to 20
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.
100.0
6%
  • Branch offices: Branch offices linked in the commercial register. Having none is normal and costs no points.85.03%
    • Full methodology

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