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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,629 companies indexed · Last updated: today
DirectoryConstruction & ArchitectureBuilding ConstructionBaselAlgon AG
Algon AG Logo
Verified· 3 sourcesTrust Score
Summary

About the company

The core activity of Algon AG is the execution of construction projects, including painting, building and renovation work, as well as the provision of construction management services as a general contractor (GU) or total contractor (TU) for private and business customers in Northwestern Switzerland. The activities include, among others: construction management (GU/TU), painting work (interior and exterior), renovation and restoration work, conversion and extension work, new construction work, flooring work, floor laying work (parquet, textile, plastic), wallpapering, and plastering and glazing techniques. The company offers its services in the Basel-Stadt region and Northwestern Switzerland.

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Products & services

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Algon AG

General Contractors
Painting & Plastering
✓ Offered7
Construction management (GC/TC)
Advisory, planning and coordination of renovations, conversions, extensions and new builds; GC/TC projects, turnkey execution including plans and building permits.
Flooring work
Laying and refreshing solid and engineered parquet, floor coverings made of textile and plastic, substrate floors, as well as tiling work and natural stone slabs.
Painting work
Interior and exterior painting work, wallpapering, putty and glazing techniques, graffiti protection and mould remediation.
Facade construction
Cladding with clinker, plastic, natural stone and fibre-cement (Eternit) panels as well as facade renders and external thermal insulation.
Windows and doors
Supply and installation of wood, wood/metal, aluminium and plastic windows as well as wood, aluminium and fire-protection doors and sliding doors.
Plastering work
General wet plaster and stucco work, special lightweight partition walls and ceiling linings, as well as acoustic ceilings.
Masonry work
Conversions, renovations, refurbishments and new builds as well as masonry work for customers, firestopping, concrete restoration and chipping work.
Trust & reputation

ranQ Trust Score of Algon AG: 4.4 out of 5.0

Trust Score4.4/ 5.0

Very high

x

Data basis 96% · As of October 2026

Algon AG scores 85.0 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.82.224%
  • 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.79.710%
  • 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.100.08%
Algon 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%
Algon AG 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%
Algon AG scores 20.0 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 35.20.04%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Algon AG reaches a ranQ Trust Score of 4.4 out of 5.0 — rated «Very high». The rating draws, among other things, on 4.8 out of 5 stars from 22 customer reviews. The data basis is 96%, so the score is backed by part of the criteria. As of October 2026.

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

Reviews

Aggregated rating

Aggregated rating
4.8
of 5

Aggregated from 22 reviews across all connected sources

Sources
GGoogle4.822
★TrustpilotSoon
PProvenExpertSoon

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

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Location

Burgfelderstrasse 229
4055 Basel

At a glance

Legal form
Corporation
UID
CHE-105.958.661
Founded
1976 · 50 years
Last commercial register change
May 13, 2026
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.
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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