The core activity of Brun & Strebel Tief- und Gartenbau AG encompasses three main areas:
1. **Deep and Road Construction**: The company offers services in the field of deep and road construction, including road construction, drainage, utility lines, and excavation work.
2. **Gardening**: Brun & Strebel also offers services in the field of gardening, including garden design, masonry and screening, natural stone work, swimming and pond construction.
3. **Real Estate**: The company is also active in the real estate sector and offers services such as property management, property accounting, and rental.
Overall, Brun & Strebel Tief- und Gartenbau AG offers a wide range of services in the fields of construction, gardening, and real estate.