Manufacturer of windows and doors made of wood, wood-metal, aluminium and plastic, produced in Baselland.
Hasler Fenster AG
Therwil (Headquarters) · Olten · SchlierenNew on Amplifa
About Hasler Fenster
Hasler Fenster AG is a Swiss window and door manufacturer headquartered in Therwil in Baselland. The family-owned company has been in existence for over 114 years and produces windows and doors made of wood, wood-metal, aluminium and plastic. The portfolio includes wooden windows, wood-metal windows, renovation windows, wooden doors, aluminium entrance doors and lift-and-slide doors. Production takes place in Baselland («Made in Baselland») with a focus on sustainability across the entire life cycle, from raw material extraction to recycling. In addition to manufacturing and installation, the company offers repairs and service management, including for windows from other manufacturers. In 2023, more than 1'300 customer projects were realised, primarily in residential construction, multi-family housing and the management of commercial properties.
- Site
- Therwil
- Processes
- Window manufacturing (wooden windows), Window manufacturing (wood-metal windows), Window manufacturing (plastic windows), Door manufacturing (wooden doors), Aluminium entrance door manufacturing, Lift-and-slide door manufacturing, Renovation windows, Window installation and mounting
- Materials
- Wood, Metal, Aluminium, Plastic, Wood-metal
- Certificates
- Warranty up to 15 years
- Industries
- Private customers (residential), Multi-family housing, Management of commercial properties
- 01
Customer consultation
- 02
Production in Baselland
- 03
Installation/assembly
- 04
Service management and repairs
Materials and Products
Wood
Used for wooden windows, renovation windows and wooden doors; ecological with a good indoor climate and excellent energy values.
Wood-metal
Combination for windows with high security, best sound insulation and ecological construction.
Aluminium
Used for aluminium entrance doors and lift-and-slide doors.
Plastic
Material for plastic windows and lift-and-slide doors.
Locations
Therwil
CHHeadquarters / branch Basel region
- Materials
- Wood, wood-metal, aluminium, plastic
Olten
CHBranch Olten region
Schlieren
CHBranch Zurich area
Products
Inside the production
Industries
Processes & technical limits
| Processes | Tolerance | Max. part | Weight | Lot size | Materials |
|---|---|---|---|---|---|
| Window manufacturing (wooden windows)Assembly | – | – | – | – | Wood |
| Window manufacturing (wood-metal windows)Assembly | – | – | – | – | Wood, Metal, Aluminium |
| Window manufacturing (plastic windows)Assembly | – | – | – | – | Plastic |
| Door manufacturing (wooden doors)Assembly | – | – | – | – | Wood |
| Aluminium entrance door manufacturingAssembly | – | – | – | – | Aluminium |
| Lift-and-slide door manufacturingAssembly | – | – | – | – | Wood, Aluminium, Plastic |
| Renovation windowsAssembly | – | – | – | – | Wood, Wood-metal |
| Window installation and mountingAssembly | – | – | – | – | – |
| Repair and services (adjusting windows, lubricating fittings, security fittingsAssembly | – | – | – | – | – |
| Repair of windows from other manufacturersAssembly | – | – | – | – | – |
Additional services
Quality and Warranty
Hasler Fenster places emphasis on sustainable production across the entire life cycle and offers up to 15 years warranty on HASLER products (details in the warranty booklet).
| Evidence | Therwil |
|---|---|
| Warranty up to 15 years |
History
- ca. 1910
Company founding; according to the website, the company has existed for over 114 years (as of 2024/2025), exact founding year not specified.
- 2023
More than 1'300 customer projects realised in 2023.