Window and door systems made from plastic profiles as well as aluminium entrance doors, manufactured at two German sites.
dtH Tiemann GmbH
Hille · HerzbergNew on Amplifa
About dtH Tiemann
The dtH Tiemann GmbH is a family business founded in 1967, now run by the third generation and one of the established manufacturers in the German window industry. The company produces window and door systems made from plastic profiles as well as aluminium entrance doors at two production sites in Germany: Hille (North Rhine-Westphalia) and Herzberg. The product range includes window systems, balcony and terrace doors, lift-and-slide doors, and plastic and aluminium entrance doors, among others based on profiles from partner VEKA AG. Products are marketed nationwide through specialized trade partners, who are supported with training, installation planning and digital tools such as an entrance door configurator. Manufacturing follows the guidelines of ift (Institut für Fenstertechnik) and is backed by the RAL quality mark as well as internal testing. With its in-house standard TSi, dtH Tiemann already offers enhanced standards for security, quality and comfort in base versions.
- Site
- Hille
- Processes
- Manufacture of window and door systems from plastic profiles, Manufacture of aluminium entrance doors, Custom lift-and-slide door manufacturing, Installation planning/support for specialized trade partners, Training (expert meetings), Funding assistance tool for customers, Entrance door configurator
- Materials
- Plastic (VEKA profiles), Aluminium, Plastic profile (VEKA)
- Certificates
- RAL quality mark, RAL quality mark (manufacturing according to ift guidelines)
- Founded
- 1967
- Industries
- Window construction, Door construction, Construction industry/Specialized trade
- 01
Profile procurement (VEKA plastic profiles, aluminium)
- 02
Manufacture of window and door systems in Hille and Herzberg
- 03
Quality testing according to ift guidelines and the RAL quality mark
- 04
Distribution via nationwide specialized trade partners
- 05
Installation planning and training for the specialized trade
Materials & Systems
Plastic profile (VEKA)
Multi-chamber systems such as SOFTLINE 76 AD and SOFTLINE 82 MD for windows, balcony and terrace doors, and lift-and-slide doors with high thermal insulation.
Aluminium
Material for premium entrance doors made of aluminium in the entrance door product line.
Sites
Hille
DEProduction site
- Materials
- Plastic (VEKA profiles), aluminium
Herzberg
DEProduction site
- Materials
- Plastic (VEKA profiles), aluminium
Products
Inside the production
Industries
Processes & technical limits
| Processes | Tolerance | Max. part | Weight | Lot size | Materials |
|---|---|---|---|---|---|
| Manufacture of window and door systems from plastic profilesAssembly | – | – | – | – | Plastic, Aluminium |
| Manufacture of aluminium entrance doorsAssembly | – | – | – | – | Aluminium |
| Custom lift-and-slide door manufacturingAssembly | – | – | – | – | Plastic |
Additional services
Reference customers
Quality
Manufacturing follows the guidelines of the Institut für Fenstertechnik (ift) and is safeguarded by continuous internal testing as well as the RAL quality mark. The company's internal standard TSi defines enhanced requirements for security, quality and comfort already in base versions.
| Evidence | Hille | Herzberg |
|---|---|---|
| RAL quality mark (manufacturing according to ift guidelines) |
Company History
- 1967
Founding of the Otto Tiemann GmbH by Otto Tiemann; since then run as a family business in the 3rd generation.
- 2022
40 years of successful partnership with VEKA AG.
- 2025
VEKA AG honored the production site Herzberg (VEKA partnership, May 2025).