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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,629 companies indexed · Last updated: today
DirectoryConstruction & ArchitectureConstruction & Project ManagementAarauBauphysik Lengg
Bauphysik Lengg Logo
Verified· 2 sourcesTrust Score
Summary

About the company

Bauphysik Lengg assists architects and building owners with building-physics and acoustic issues for new construction and renovation projects. Services include consulting and specialist planning in thermal protection, sound insulation, moisture protection, hygrothermal simulations (WUFI), energy proofs, and advice on sustainability standards such as Minergie and GEAK.

AI-generated
Offering

Products & services

Industry:Construction & Project Management
✓ Offered10
Thermal insulation consulting
Advisory services for the building envelope in the field of thermal insulation in accordance with cantonal energy legislation as well as SIA 380/1 and SIA 180 for renovations and new builds.
Specialist planning / energy performance assessment
Preparation of component catalogues, calculation of thermal bridges, submission of the energy performance assessment, review of detail catalogues, and site inspections for renovations and new builds.
Acoustic insulation consulting
Advisory services for acoustic insulation according to SIA 181 for new and renovated buildings.
Specialist planning / acoustic insulation assessment
Review and assessment of the structural build-up of separating elements, and preparation of the acoustic insulation assessment for authorities and the client.
Room acoustics
Consulting and concept development for rooms with room-acoustic requirements according to DIN 18041.
Moisture protection calculation
Testing and assessment of the risk of vapour diffusion and condensation water in structures, including hygrothermal simulation with WUFI.
Assessment of moisture damage
Consulting regarding moisture and mould problems in occupied rooms and cellar rooms.
Sustainability consulting
Consulting and comparisons of building standards such as Minergie, GEAK, the SIA efficiency path Energy, and SNBS.
Minergie
Planning of buildings according to Minergie, Minergie-P, Minergie-A and Minergie ECO, as well as preparation of the verification documentation and coordination of the planning team.
GEAK
Preparation of GEAK, GEAK plus and GEAK Neubau.
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Bauphysik Lengg

Trust & reputation

ranQ Trust Score of Bauphysik Lengg

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

Bauphysik Lengg 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%
Bauphysik Lengg scores 57.0 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.50.012%
  • 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%
Bauphysik Lengg scores 85.0 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).85.022%
Bauphysik Lengg 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.

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Location

Rathausgasse 8
5000 Aarau

At a glance

Legal form
Sole proprietorship
UID
CHE-436.392.751
Founded
2023 · 3 years
Last commercial register change
November 15, 2023
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.
67.0
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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