Jürgen Sperzel

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.

SCHWABENHAUS GmbH & Co. KG engages in the manufacture of prefabricated houses. It also offers geothermal heating, air-to-water heat pumps, as well as ventilation and photovoltaic systems. The company was founded in 1966 and is headquartered in Heringen, Germany.

STREIF GmbH provides real estate services. It develops, manufactures, distributes buildings and building materials of all types, particularly prefabricated, for private and industrial use. Its services include technical domestic installations also. The company was founded in 1929 and is headquartered in Weinheim, Germany.