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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint747,212 companies indexed · Last updated: today
DirectoryConstruction & ArchitectureFacade constructionWaldstattBlumer Fensterwerke AG
Blumer Fensterwerke AG Logo
Verified· 3 sourcesTrust Score
Summary

About the company

Blumer Fensterwerke AG manufactures timber, timber-aluminium, PVC and metal windows, as well as mullion-transom façade systems. Its services also include historical and custom-made specialist windows, window renovation and restoration, consulting, sales and installation.

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Service area

Offering

Products & services

Industry:Facade construction
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Blumer Fensterwerke AG

Window construction
✓ Offered10
Wooden windows
Production and installation of wooden windows and lift-and-slide doors, with thermal, acoustic and burglary protection options as well as different wood types and surface treatments.
Wood-metal windows
Production and installation of wood-metal windows and lift-and-slide doors, with a weatherproof metal outer shell, various glazing types, surfaces and security options.
PVC windows
Production and installation of PVC windows and lift-and-slide doors, with multi-chamber profiles, color and decor options as well as thermal insulation, acoustic protection and security versions.
PVC-metal windows
Production and installation of PVC-metal windows and lift-and-slide doors, with an aluminium outer shell, various surface finishes, security and insulation options.
Post-and-rail facade systems
Production and installation of post-and-rail facade systems made of wood or wood-metal, with thermally separated systems, triple glazing, fire protection and passive-house options.
Specialty windows
Production and installation of specialty windows such as sliding windows, vertical tilt windows, pivot windows, turn sashes, as well as round, convex or concave shapes.
Historic window products
Historic window solutions for monument preservation and old buildings, including style-appropriate replacements, replicas, double or triple glazing and technically adapted installations.
Style-appropriate replacement of historic windows
Style-appropriate replacement of historic and heritage-preservation windows with wood or wood-metal systems closely matching the original, including for listed buildings, churches, castles and old town properties.
Restoration of historic windows
Restoration and refurbishment of historic windows while preserving the existing structure, including lead and art glass, fittings, hinges and old locking systems.
Service work
Repairs, warranty work, adjustment work, measuring for replacement glass, insect protection, interior shading systems, as well as cat and pet flaps.
Trust & reputation

ranQ Trust Score of Blumer Fensterwerke AG: 4.1 out of 5.0

Trust Score4.1/ 5.0

High

x

Data basis 58% · As of November 2026

Without public customer reviews the score stays capped.

Blumer Fensterwerke AG 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%
Blumer Fensterwerke AG scores 95.8 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.96.07%
Blumer Fensterwerke 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%
Blumer Fensterwerke AG scores 51.9 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 35.77.14%
  • Media authority: Quality and number of editorial mentions, weighted by the importance of the source, plus the recency of the latest high-quality mention.26.74%
Qualifications+0.00

Blumer Fensterwerke AG reaches a ranQ Trust Score of 4.1 out of 5.0 — rated «High». No public customer reviews are available for this provider; the rating is based on the remaining criteria. The data basis is 58%, 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.

Press

Media

December 8, 2025Media
Eine Ära geht zu Ende – eine neue beginnt
tagblatt.ch
October 17, 2023Media
Konzentration der Produktion an einem Standort
appenzell24.ch

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Location

Schönengrundstrasse 1
9104 Waldstatt

At a glance

Legal form
Corporation
UID
CHE-105.894.854
Founded
1994 · 32 years
Last commercial register change
June 15, 2026
Employees
101 to 500
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

    Active in 2 of 26 cantons · 10 municipalities

    • Wahlkreis Toggenburg
    ZHZurich

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