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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,765 companies indexed · Last updated: today
DirectoryConstruction & ArchitectureArchitecture FirmsAarauHarko AG
Harko AG Logo
Verified· 3 sourcesTrust Score
Summary

About the company

The core activity of HARKO AG is the development, planning and realization of buildings for the property sector as a general contractor, including architecture, real estate and general contracting. This also includes the sale of in-house projects and the execution of mandate orders from clients.

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Products & services

Industry:Architecture FirmsGeneral Contractors
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4.0/5

Harko AG

Real Estate Brokerage
✓ Offered7
General contractor for turnkey homes
General contractor for turnkey homes, from planning through construction to occupancy; projects in solid construction with flexible interior fit-out and guaranteed prices.
Sale of new-build condominiums and own developments
Sale of own real-estate projects and condominium units, including new-build offerings in different locations as well as mandate assignments from developers.
Property sales for private properties and projects
Free market assessment, tailored marketing and sale of private properties and projects up to the signing of the notarial purchase agreement.
Architecture and building planning
Architectural services for owner-occupied homes and residential projects, including planning of room concepts, finishing standards and individual implementation for personal living needs.
Alterations and renovations
Alterations and renovations with tailored implementation, a cost-optimised approach and execution together with partner companies.
Single-family homes
Single-family homes in various architectural variants, with a flexible room layout, two living floors, large window fronts and individual finishing options.
Semi-detached houses
Semi-detached houses in various architectural variants, with freely planned room layouts, a balcony or terrace and a range of living and finishing options.
Trust & reputation

ranQ Trust Score of Harko AG: 4.0 out of 5.0

Trust Score4.0/ 5.0

High

x

Data basis 96% · As of October 2026

Harko AG scores 53.8 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.70.824%
  • 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.27.910%
  • 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%
Harko AG scores 89.3 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.70.07%
Harko 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%
Harko 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

Harko 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 2 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
5
of 5

Aggregated from 2 reviews across all connected sources

Sources
GGoogle52
★TrustpilotSoon
PProvenExpertSoon

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

Knowledge

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Location

Rössligutstrasse 1
5000 Aarau
Opening hours
Mon
08:00 - 12:00, 13:30 - 17:00
Tue
08:00 - 12:00, 13:30 - 17:00
Wed
08:00 - 12:00, 13:30 - 17:00
Thu
08:00 - 12:00, 13:30 - 17:00
Fri
08:00 - 12:00, 13:30 - 17:00
Sat
Closed
Sun
Closed

At a glance

Legal form
Corporation
UID
CHE-103.321.553
Founded
1983 · 43 years
Last commercial register change
February 19, 2024
Employees
11 to 20
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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