Groke

Groke Türen GmbH

The Groke and SOMMER companies came together in 2004. Groke is a pioneer on the German front door market and sets standards in design, security and ecological energy balance

Groke‘s technical intelligence and innovation have brought us pioneering products such as the invisible swing door operator, the automatic sliding door and the loft doors. The collaboration with SOMMER promises further progress. This success would not have been possible without our loyal customers, suppliers and dedicated workforce.

Gerd Schaaf

Managing Partner

Strong growth that connects

Starting signal

Groke Doors Ltd. in Hagenbach can already look back on over 125 years of success in metal construction. The company has made a name for itself above all with pioneering solutions in the field of aluminium construction elements.

Groke products are among the top products for the German building element market and are manufactured in accordance with the strictest in-house standards. Their design and security set standards, as does their ecological energy balance, which is based on outstanding, specially developed, thermally insulated aluminium profile systems. Another milestone is the keyless opening of front doors via fingerprint. Every Groke product makes its way from the factory to the customer in elaborate, secure individual packaging. To ensure that deliveries and promised deadlines are always met exactly, Groke‘s own fleet of vehicles is on the ball and arrives at its destination on time.

Aluminium front doors

Made to measure

The front door is crafted by us according to your personal preferences and fits your house perfectly. Computer-controlled saws, drills, milling machines and punches ensure precisely fitting components, such as the customised frame. But it‘s not just our machines that work precisely and reliably. We owe the quality of Groke doors to our qualified employees, whose skill and manual labour ensure that everything is just right.

History - Groke

1898

Foundation of the company

The company goes back to the small locksmith‘s business of Georg Groke. The foundation stone was laid on 01 April 1898. Quality and craftsmanship quickly brought the first customers. After just a few years, Georg Groke was able to supply the Grand Ducal Court and the Baden State Theatre.

1934:
Generational change in the Groke metalworking shop. The "management" of the company passed from the senior to the junior Otto Groke.

1947:
The big blow came at the end of the Second World War, when both Groke workshops were destroyed by bombs. In 1947, the company boss died, which prompted his wife Elisabeth Groke to take over the management.

1948:
The restoration of the grand ducal steel greenhouse in the botanical garden in Karlsruhe, which had been badly damaged by incendiary bombs. The opinion of the responsible experts was demolition. Groke saved the partially artistically forged steel structure.

1950:
Pioneer of the aluminum industry in Germany. In the mid-1950s, aluminium began its (German) triumph.

1986

Enormous progress

During the German economic miracle years, Groke made the breathtaking change of direction from craftsmanship to industry. A milestone was the year 1968, when industrial-craftsmanship element construction was rigorously promoted. The Groke company now began to operate as a limited partnership (KG). At the same time, the production halls spread across Jockgrim and Karlsruhe were brought together on the company premises on Wikingerstrasse, which covered over 10,000 square meters.

1991

First main catalogue from Groke

"All doors are great. Groke is the trump card!"
(Excerpt from the main catalogue "The Door" from 1991).

The main catalogue, which still bears the same name today, was built and lived according to this motto. Groke front doors have stood for the highest quality standards and solidity from the very beginning.

The now outdated GROKETHERM 280 profile was introduced in 1992 and was very well received. The 80 mm wide profile system offered the best basis for a "real Groke hit" thanks to its high stability and thermal insulation. At that time, the current Symphonie profile also existed, which was simply called "Softline" and was equipped with the 4-sided central bar seal.

2004

New times for Groke 2004

On June 1st, 2004, new times began once again for Groke. On this date, Groke GmbH & Co. KG was taken over by SOMMER Antriebs- und Funktechnik GmbH, based in Kirchheim/Teck, Baden-Württemberg. Within the new corporate group, however, Groke remained an independent company.

2006:
2006 was a year of changes. The profile system that had been used for years was replaced by a new, specially developed 3-chamber profile system and was clearly ahead of its time. By using the optimally thermally insulated 3-chamber profile system Groketherm "GT 190", the requirements of the Energy Ordinance (EnEv) of 2002 were fully met.

2015

Quantum leap

The Groke front door is enjoying growing popularity, which requires new production capacities. The town of Hagenbach on the left bank of the Rhine was chosen for this important expansion of industrial production capacities. The production facility in Hagenbach started operations in November 2015.

Colorfast

The high-quality doors of the Groke brand are valued on the global market above all for their creative designs and exclusive color concepts. Since the opening of the new production facility in Hagenbach, coatings and colorfast paints have been applied to the doors particularly efficiently. This is ensured by a tailor-made, innovative and environmentally friendly powder coating system that can work with all RAL colors and many coloristic intermediate tones as required.

2019

metaku Metall- und Kunststoffbau GmbH

With the takeover of metaku Metall- und Kunststoffbau GmbH in 2019, the company brought a strong partner in the field of panel construction into the SOMMER Group. metaku was founded in 1972 as a metal foundry in Liebenau. However, it quickly became apparent that the demand for front doors, especially front door panels, was steadily increasing.

2023

New doors open

The SOMMER group of companies, with its subsidiary Groke, is expanding the Hagenbach site by around 7,000 m² of production space and 2,000 m² of offices and exhibition space. The expansion and extension of production capacities are urgently needed to meet the steady growth of the Groke company and the great demand for aluminum front doors.

2024:
Market launch of loft door systems made of
aluminium.

Through customisation and efficiency

Quality

We want you to feel comfortable in your own four walls. That's why we put a lot of effort into your front door. What makes a Groke front door better than others is the mix between highly professional machines for aluminum profile processing and individual handwork during production, as well as the specially developed profile systems.
This makes the difference in quality.

Production
Groke front doors are among the top products on the German market. Perfect workmanship, stylish design and safety make our doors what they are. 125 years of experience in metal construction can be seen in the doors. Thanks to our self-developed profile system, a construction depth of 90 mm and material thicknesses of up to 3 mm, the doors are stable and robust. The solid construction gives a high-quality impression.

Our system

Made in Germany

Many other manufacturers use purchased profile systems.
Not so with Groke: We developed our profile system ourselves and continually optimized it down to the smallest detail.

Thanks to a construction depth of 90 mm and material thicknesses of up to 3 mm, Groke doors are stable and robust. The heavy construction and the safety elements that are already included as standard in the basic equipment offer reassuring protection. A stable connection between the frame and the threshold makes installation easier and ensures that the construction is extremely resilient and long-lasting.

As standard, three all-round sealing levels ensure high wind and weather resistance without interruption. Because only a really tight door protects you from cold and noise.

Moving forward together

Improved energy balance

The topic of energy efficiency continues to gain in importance. Rightly so, in our opinion. That is why we have long been using multiple sealing levels when developing our doors. Because only a really tight door protects you from cold and noise, reduces your heating costs in winter and supports energy-efficient living through intelligent construction. So that you can take advantage of support in improving your energy balance, the KfW offers financial support for renovation measures.

Our goal

approx. 4,850 sqm PV system area
2,637 installed modules
905 kWp system size

Environmentally friendly powder coating

Powder coating, known for its aesthetic and environmentally friendly properties, is increasingly focusing on sustainability. By integrating heat recovery systems, heat generated during the coating process is recovered and fed back into the production process. At the same time, water is purified by evaporation and reused in a closed loop. These sustainable practices not only reduce energy consumption but also minimize water consumption, promote resource efficiency and contribute to environmentally friendly production processes.

In-house climate chamber

Cold-resistant and extremely heat-resistant: Groke doors are rightly expected to be both. That is why the materials used must withstand freezing temperatures and scorching heat in Groke's own climate chamber. Thermographic tests reach surface temperatures of -30°C to +100°C.

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Groke