u&i GmbH - Our History

The success story of u&i GmbH begins with the foundation in 1993 and continues until today. The most important milestones in our history include …


30th company anniversary.


Mit Wirkung zum 01.07.2022 hat die in Hannover ansässige umweltttechnik & ingenieure (u&i) GmbH 100 % der Anteile des ebenfalls aus Hannover stammenden Ingenieurbüros für Abfallwirtschaft und Energietechnik (IBA) GmbH übernommen.


With the beginning of the new decade, a new chapter in the history of UI GmbH starts. At the beginning of the year, the next stage of the generation handover was completed.


The end of decade for UI GmbH like the rest of the world was marked by the corona virus pandemic.

With the onset of the first lockdown in Germany in March/April as a reaction the rapidly spreading Corona infections, we decided early on to forego external appointments and meetings in person in order to protect our clients and also ourselves. Through a quick and well-organized switch from an office presence to mobile work (e.g. from home office), we were able to reorganize your projects with the help of additional software and minor changes in work processes. This way we were able to continue and/or complete our assignments in the quality you are accustomed to.


  • a successful first year with the employees as owners!
  • turnover of more than 3 million €
  • the employees take on internal responsibility and organise large fields of the company
  • about 2 % of the turnoveare  are reinvested in further education, new software licenses introduction of VR glasses

2018 - ein ereignisreiches Jahr!

  • 25th company anniversary.
  • company participation in the dragon boat festival in Hannover.
  • foundation of ui-Mitarbeiterbeteiligungs-GmbH by the employees of u&i GmbH.
  • sale of u&i GmbH to Mitarbeiterbeteiligungs-GmbH and BillionGroup Technologies Ltd.


02.06.2016 - Foundation of "BUI" - a joint venture of BillionGroup Ltd. Hong Kong and u&i GmbH


Move to the current office building at Wöhlerstraße 42 in Hannover


Expansion of the company premises and move to Vahrenwalder Straße 253a in Hannover


Move to the first office in Hannover


Foundation on 27.08.1993 by Manfred Schubert, Nils Oldhafer and Thomas Schücke with headquarters in Nienburg

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