About us/Team | kollegger.net
About us

Metal glass constructions at the highest stage

Kollegger Metallbau, founded in 1998, is a leading metal construction company domestic and abroad, specialised in extraordinary metal construction design. Thanks to our long-term experience in high-quality metal construction, we do outstanding work and offer comprehensive consulting as well as technical support for architects, planners, structural engineers and constructors for perfectly realising special solutions. Our complete service offer includes retractable glass facade – the DESCENDING WINDOWS, facades, roofing and winter gardens, carports as well as banisters. In addition we provide special customized fabrication of furniture as well as design and art objects.

Talk with us about your ideas and vision.

Descending Windows

As official distribution partner of HIRT swiss descending windows, we have introduced the “DESCENDING WINDOWS” as highlight of our service offer. Thanks to the descending windows, new and absolutely variable room concepts are possible. The retractable glass facade enables stepless access to the exterior and is mostly used for architectural design in hotels and restaurants as well as in private houses or show rooms. Over the past years, we have helped numerous customers, domestic and especially abroad, get their personal unique, absolutely flexible living environment and have their lifelong dream fulfilled.

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Descending Windows

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Team Kollegger Metallbau – Your trusted partner

Improving already known products, developing new products, bringing out the main points and offering our customers maximum satisfaction in technical, ecological as well as aesthetical terms: This is the philosophy and aspiration of Martin Kollegger and his team. 

Modern architecture requires the symbiosis of great transparency and generous spatial opening, which demands special solutions. We are a leading company for the realisation of high-quality metal glass constructions at the highest stage and offer individual solutions rather than off-the-shelf products.

We are known for our high and long-term quality. Our customers are well attended to and look to us. The complexity and uniqueness of our products are our formula for success. We are your trusted partner for highest quality and design requirements. Get in touch with us!


Martin Kollegger

CEO, Owner


T.: +43 3132 5441-0
M.: +43 664 4003548


Daniel Fasching

Managing Director


T.: +43 3132 5441-0
M.: +43 664 4236467


Markus Paar

Project Manager


T.: +43 3132 5441-0
M.: +43 664 1036448


Kerstin Beichler

Backoffice Manager/Accounting


T.: +43 3132 5441-11


Marlies Jesernik

Backoffice Manager/Marketing


T.: +43 3132 5441-0


Maria Vacheva

Descending Windows Marketing International


T.: +43 3132 5441

Cooperation at the highest stage



Our long-term cooperation with HIRT swiss descending windows offers our customers sterling descending windows projects in terms of design, quality and execution. Discretion and privacy protection take top priority in our company.

After 15 years of fruitful collaboration and after having become absolutely confident of the uniqueness of the descending windows system, our CEO Martin Kollegger decided in 2016 to become associate at the foundation of HIRT swiss descending windows. He also joined the governing board. We are looking forward to conjointly realize numerous exciting descending windows projects for exceptional customers in the future.

At a national and international level, we only choose the best products and collaborate only with select suppliers both of which meeting our high quality standards. Hence, it is possible to not only stabilise our high service level in all areas but to constantly enhance it as well.