The core activity of GROBAU consists of three main areas: 1. Horticulture: The company offers services in the field of horticulture, which includes the planning, design and maintenance of gardens and outdoor facilities. 2. Civil engineering: GROBAU is also active in civil engineering, which includes the construction and renovation of underground structures, such as foundations, basements, tunnels and other subterranean constructions. 3. Service station renovation: Another focus of the company is the renovation of service stations, which includes the renovation and maintenance of service station facilities, including the disposal of hazardous waste and the restoration of the environment.