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Aluplast

aluplast is a family-run German developer of plastic window and door profile systems, describing itself as a leading innovator in its industry.

Last updated September 15, 2026

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Overview

aluplast develops window and door solutions for window fitters, with a product range covering window systems, door systems, main entrance door systems and sliding door systems. The company describes itself as a leading innovator and, on an international scale, as one of the leading providers of plastic profile systems. Founded by Manfred J. Seitz, it has been taken over by his sons Patrick and Dirk Seitz, making it, in its own words, the only owner-run company in its sector. Its products emphasise heat insulation, safety and design, including the energeto window range, which is described as a window without any metallic thermal bridges.

History

aluplast was founded by Manfred J. Seitz and has since been taken over by his sons Patrick and Dirk Seitz. According to the company, over the past 30 years technology advanced at an incredible rate, and aluplast responded by spotting trends and developments early and innovating continually. In the space of just 30 years, aluplast transformed into a global player with 24 production sites and sales offices all over the world. The company states that it is the only owner-run company in its sector and is guaranteed to retain this status for the long term. It received the TOP100 Award in 2016 and 2017, recognising it as an innovative medium-sized enterprise.

Products and positioning

A leading innovator in its industry and, on an international scale, one of the leading providers of plastic profile systems; a family-run, owner-run company.

  • energeto

    A window without any metallic thermal bridges; all versions and construction depths in this range record impressive insulation figures, helping to actively reduce CO2, cut heating costs and protect the environment.

  • vario-slide

    Listed among aluplast's product highlights.

  • aludec

    Described as inspired by style.

  • woodec

    Described as inspired by nature.

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