Marco Hammer

Bien-Zenker GmbH is a holding company, which develops and produces prefabricated houses. The firm specializes in the design, construction, and marketing of prefabricated houses of various sizes and architectural styles. Its product portfolio encompasses single-family and two-family dwellings, multi-family houses, bungalows, row houses, apartments, duplexes, maisonettes, and townhouses. It also provides construction design, home automation, and consulting services. The company was founded by Heinrich Bien in 1906 and is headquartered in Schluechtern, Germany.

HANSE HAUS GmbH & Co. KG is a holding company, which engages in the sale of pre-manufactured homes. It offers mansions, town houses, pent roof houses, cottage and regional type houses, Mediterranean-style houses, architect-designed houses, as well as single-family and semi-detached houses. The firm also offers development and planning services. The company was founded by Hermann Wandke in 1929 and is headquartered in Oberleichtersbach, Germany.

Bien-Zenker Holding GmbH provides business and economic services. The private company is based in Schlüchtern, Germany. The CEOs of the German company are Marco Hammer, Christian Garke.

Oikos Holding GmbH is a German company that specializes in prefabricated houses. The company is based in Schluechtern, Germany, and has subsidiaries in Germany. The private company offers intelligent overall systems that save money and nerves. The company combines the expertise of three brands in prefabricated construction and strategic partnerships. Oikos Holding invests in the OIKOS-Gruppe and aims to fulfill people's dreams of owning a home. The company provides professional and personal service with a focus on sustainability. Oikos Holding was founded in 2018, and the CEO is Marco Hammer.

Oikos Group GmbH is one of the largest prefabricated house manufacturers in Germany. The company is based in Schluechtern, Germany, and has subsidiaries in Germany. The German company focuses on sustainable, modern, and high-quality construction. Oikos Group values building in a community with shared values. The CEOs of the company are Marco Hammer, Christian Garke, Marcus D'Agostino.