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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint746,952 companies indexed · Last updated: today
DirectoryConstruction & ArchitectureRenovationSerneusBoner Holzbau AG
Boner Holzbau AG Logo
Verified· 3 sourcesTrust Score
Summary

About the company

Boner Holzbau AG is a timber construction and carpentry business with a joinery workshop. Its services include timber construction planning, prefabricated and system construction, renovations, conversions and extensions, as well as joinery, window construction and painting.

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Presence

Service area

Offering

Products & services

Industry:RenovationTimber construction
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4.0/5

Boner Holzbau AG

✓ Offered8
Consulting
Consulting for new builds, interior space design, conversions, balconies, loft extensions, conservatories, roof additions, renovations, annexes and insulation.
Carpentry work
Timber construction planning, general carpentry work, timber element and system construction, renovations, conversions and extensions.
Joinery work
Furniture, flooring, interior and exterior doors, interior design, built-in wardrobes, shelves, bathroom furniture, kitchen fittings and custom-made furniture.
Window construction
Renovation and new window construction, safety fittings and glazing work.
Painting work
General painting work, painting and lacquering, sgraffito, lettering and restoration of window shutters.
Estimating
Preparing bills of quantities, taking measurements, drafting work contracts and preparing cost estimates.
Structural calculations
Sizing of timber structural components and fasteners for simple systems, determining and calculating loads.
Damage analysis
Analysis of building defects, identifying the cause of damage, solution proposals for remediation and cost compilation.
Trust & reputation

ranQ Trust Score of Boner Holzbau AG: 4.0 out of 5.0

Trust Score4.0/ 5.0

High

x

Data basis 96% · As of November 2026

Boner Holzbau AG scores 49.8 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.68.224%
  • 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.17.610%
  • 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.35.08%
Boner Holzbau AG scores 92.3 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.82.07%
Boner Holzbau 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%
Boner Holzbau AG scores 37.1 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 35.37.14%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Boner Holzbau AG reaches a ranQ Trust Score of 4.0 out of 5.0 — rated «High». The rating draws, among other things, on 5.0 out of 5 stars from 1 customer reviews. The data basis is 96%, so the score is backed by part of the criteria. As of November 2026.

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

Reviews

Aggregated rating

Aggregated rating
5
of 5

Aggregated from 1 reviews across all connected sources

Sources
GGoogle51
★TrustpilotSoon
PProvenExpertSoon

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

Knowledge

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Comparisons

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Location

Aujiweg 8
7249 Serneus
Opening hours
Mon
07:30 - 12:00, 13:00 - 17:30
Tue
07:30 - 12:00, 13:00 - 17:30
Wed
07:30 - 12:00, 13:00 - 17:30
Thu
07:30 - 12:00, 13:00 - 17:30
Fri
07:30 - 12:00, 13:00 - 16:00
Sat
Closed
Sun
Closed

At a glance

Legal form
Corporation
UID
CHE-107.053.699
Founded
1985 · 41 years
Last commercial register change
September 2, 2026
Employees
21 to 50

Active in 1 of 26 cantons

  • GRGrisons
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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