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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,701 companies indexed · Last updated: today
DirectoryConstruction & ArchitectureCivil Engineering FirmsNeuchâtela21 sàrl
a21 sàrl Logo
Verified· 2 sourcesTrust Score
Summary

About the company

a21 sàrl is an engineering consultancy providing expert assessments, technical advice, concept development, project management and research. Its services include building physics and construction (acoustics, moisture and hazardous-substance diagnostics), environmental and noise studies, energy and sustainability planning, and training.

AI-generated
Offering

Products & services

Industry:Civil Engineering Firms
✓ Offered5
Energy consulting and expertise
Studies for energy improvement and optimisation, energy balances for building permits, energy concepts, energy-efficiency assessments, renewable energies and solar installations.
Construction consulting and expertise
Private and judicial assessments, building physics, indoor acoustics, thermal envelope, thermography, moisture problems, hazardous substance diagnostics and project management.
Training and supervision
Supervision of traineeships and diplomas, conferences and seminars, technical courses and educational materials on energy, the environment and sustainable development.
Environmental consulting and expertise
Noise protection studies, impact studies, light pollution, electromagnetic fields, air quality, vibrations, waste management and contaminated sites.
Sustainability consulting and expertise
Cité de l’énergie support, monitoring projects for the Société à 2’000 Watt, Agenda 21s, ecobilances, sustainable neighbourhoods, cooperation projects and economic analyses with external costs.
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a21 sàrl

Trust & reputation

ranQ Trust Score of a21 sàrl

Trust Score

No score yet

x

A published score requires a data basis of at least 50% and data from at least two criteria groups other than identity. Missing evidence: Review quality, Review volume, Review recency, Media authority

Data basis 54% · As of October 2026

a21 sàrl 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%
a21 sàrl scores 83.0 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%
a21 sàrl scores 83.3 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).83.322%
a21 sàrl scores 0.0 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 35.0.04%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%

The data basis is 54%, below the threshold at which ranQ publishes a score. Evidence is missing for: Review quality, Review volume, Review recency, Media authority. As of October 2026.

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

Knowledge

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Location

Rue des Beaux-Arts 21
2000 Neuchâtel

At a glance

Legal form
Limited Liability Company
UID
CHE-115.652.123
Founded
2010 · 16 years
Last commercial register change
May 10, 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.
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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