The task of this diploma thesis is to prepare the design of sanitary and gas pipeline installations in the assigned hospital building. The building has one underground and four above-ground floors. On the underground floor there are technical premises including a boiler room, hygienic facilities of staff and rooms for storage and cleaning. On the first floor there are ambulances of various kinds. Patient rooms are located over the second and third floors. Each room has its own built-in bathroom. There are also doctor's examination rooms and daily room of staff. On the fourth floor there is an ICU. In the theoretical part I deal with the legionella bacterium. I explain what causes this bacterium, what are the conditions for its reproduction, where it occurs and what measures will prevent its multiplication in water pipes. In the next part, I compare two possible variants of the solution of the design of water pipe routes with the subsequent selection of a more suitable option. The calculation part contains all the calculations used to design sewerage, water supply and gas pipeline, including their connection to utilities.