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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint746,952 companies indexed · Last updated: today
DirectoryConstruction & ArchitectureCivil worksHerisauAlder Bau AG
Alder Bau AG Logo
Verified· 4 sourcesTrust Score
Summary

About the company

Alder Bau AG provides construction services such as demolition, hazardous-material removal, earthworks and civil engineering; it also offers transport services (heavy and material transport, container services) and waste disposal and recycling via a disposal yard.

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Service area

Offering

Products & services

Industry:Civil works
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Alder Bau AG

✓ Offered6
Civil engineering
Utility and civil engineering for new builds and renovations, utility network connections, trench construction, sewer systems, utility construction and site works.
Earthworks
Excavation work for developments and single-family homes, utility trenches, dam backfill, terrain modifications and excavation pits using different machines.
Demolition
Demolition of structures, removal of hazardous substances, recovery of construction materials and mobile recycling with on-site separated material processing.
Transport
Heavy transports, carriage of bulk materials, transport of waste subject to accompanying documents, and various material runs with its own fleet of trucks.
Skip service
Delivery of small and roll-off skips in various sizes, as well as subsequent disposal for construction sites and private customers.
Waste disposal
Acceptance of mineral construction waste for private individuals and businesses, separate collection, processing into recycled building materials and drop-off at the waste disposal yard.
Trust & reputation

ranQ Trust Score of Alder Bau AG: 4.3 out of 5.0

Trust Score4.3/ 5.0

Very high

x

Data basis 100% · As of November 2026

Alder Bau AG scores 85.7 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.82.324%
  • 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.100.010%
  • 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%
Alder Bau 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%
Alder Bau AG scores 88.3 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).88.322%
Alder Bau AG scores 12.2 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: Quality and number of editorial mentions, weighted by the importance of the source, plus the recency of the latest high-quality mention.10.04%
Qualifications+0.00

Alder Bau AG reaches a ranQ Trust Score of 4.3 out of 5.0 — rated «Very high». The rating draws, among other things, on 4.7 out of 5 stars from 63 customer reviews. As of November 2026.

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

Reviews

Aggregated rating

Aggregated rating
4.7
of 5

Aggregated from 63 reviews across all connected sources

Sources
GGoogle4.763
★TrustpilotSoon
PProvenExpertSoon

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

Press

Media

October 30, 2020Media
Nach 88 Jahren: Die Alder Bau AG aus Herisau wird von der Firma Slongo AG übernommen
appenzellerzeitung.ch

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Location

Steinrieselnstrasse 40
9100 Herisau
Opening hours
Mon
07:30 - 11:45, 13:00 - 16:45
Tue
07:30 - 11:45, 13:00 - 16:45
Wed
07:30 - 11:45, 13:00 - 16:45
Thu
07:30 - 11:45, 13:00 - 16:45
Fri
07:30 - 11:45, 13:00 - 16:30
Sat
Closed
Sun
Closed

At a glance

Legal form
Corporation
UID
CHE-107.073.704
Founded
1965 · 61 years
Last commercial register change
July 7, 2023
Employees
1 to 10

Active in 1 of 26 cantons · 1 municipality

  • ARHerisau
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.70.03%
    • Full methodology

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