ranQ
ranQ
ranQ
DirectoryIndustriesPlacesKnowledgeComparisonsSoon
Sign inCheck visibility
ranQHSG Startup LabelRecognised by the
HSG Startup Label

The leading AI company directory, built to boost AI visibility.

DEENFRIT
Product
  • Pricing
  • Directory
  • Industries
  • Trust Score
Company
  • About
  • Contact
  • Legal
© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,629 companies indexed · Last updated: today
DirectoryConstruction & ArchitectureBuilding ConstructionMühlethurnenPortner Bau AG
Portner Bau AG Logo
Verified· 3 sourcesTrust Score
Summary

About the company

The core activity of Portner Bau AG is the execution of construction work, particularly for homeowners, property managers, architects and companies. This includes all work from foundation to interior finishing, including customer-specific work such as masonry.

AI-generated
Offering

Products & services

Industry:Building ConstructionBuilding Maintenance
LeadhubOutbound Leads by COHAGA

Looking for direct email addresses and phone numbers?

Leadhub delivers verified contact details and decision-makers from over 750,000 Swiss companies — management, procurement, marketing, HR.

Discover Leadhub
4.1/5

Portner Bau AG

Civil Engineering
Site Preparation
✓ Offered8
Above-ground construction
Above-ground construction for new builds, renovations, extensions and client work; including planning, execution, forecourt, retaining wall and house extension.
Civil engineering
Civil engineering for forecourts, retaining walls and other construction work; from consultation to execution.
Renovation and extensions
Renovation and extensions with planning, execution and on-site support; also includes house extensions and client work.
Facade renovation and thermal insulation
Facade renovation and thermal insulation for existing buildings; support from planning to execution.
New construction
New construction of buildings and other construction projects; advice, planning and execution from one source.
Site surroundings
Site surroundings works around properties and construction projects; complements above-ground and civil engineering works as well as client work.
Core drilling
Core drillings as a specialized construction service for renovations, refurbishment and other construction work.
Construction consulting
On-site construction consulting with non-binding advice and quotation; support from planning to execution.
Trust & reputation

ranQ Trust Score of Portner Bau AG: 4.1 out of 5.0

Trust Score4.1/ 5.0

High

x

Data basis 96% · As of October 2026

Portner Bau AG scores 71.4 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.76.724%
  • 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.45.610%
  • 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.88.08%
Portner Bau AG scores 76.6 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.79.212%
  • 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%
Portner Bau 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%
Portner Bau AG scores 17.1 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 35.17.14%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Portner Bau AG reaches a ranQ Trust Score of 4.1 out of 5.0 — rated «High». The rating draws, among other things, on 5.0 out of 5 stars from 5 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 5 reviews across all connected sources

Sources
GGoogle55
★TrustpilotSoon
PProvenExpertSoon

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

Knowledge

No knowledge articles yet

Once Portner Bau AG has claimed this profile, we'll publish editorial articles and case studies here together.

Get started
Comparisons

Portner Bau AG in comparison

Soon

Industry comparisons are coming soon

We're preparing industry comparisons that rank Portner Bau AG by reviews, experience and specialisations.

Is this your company?

Claim the company profile of Portner Bau AG to make its contact details visible. With a plan we additionally create and publish industry comparisons, articles and much more.

Secure profile

Location

Fischermatt 4
3127 Mühlethurnen

At a glance

Legal form
Corporation
UID
CHE-464.044.752
Founded
2018 · 8 years
Last commercial register change
November 3, 2025
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

    Similar companies

    TB
    Thoenen Bauunternehmung AG
    Gstaad
    AS
    Armaspez Schweiz AG
    Bützberg
    ER
    E. Rubeli, Bauunternehmung
    Gampelen
    BS
    Burn Spezialbau AG
    Adelboden
    WB
    Wüthrich Bau AG
    Münchenbuchsee
    ZH
    Zurbrügg Hoch- und Tiefbau GmbH
    Reichenbach Im Kandertal
    AB
    A. Bill AG
    Wabern
    GB
    Glauser Bau AG
    Bern