In the final work, a conceptual solution for the water supply and sewage installation for a multi-story family house (Ground Floor + Upper Floor + Attic) is provided. Since the house is located in the city of Pula, potable water is sourced from the public water supply, while sanitary wastewater from the building is discharged into the public sewage system, which leads to a treatment facility. The system for collecting rainwater diverts the collected rain to an infiltration well. All components of the water supply and sewage installation are designed according to the applicable regulations. The final thesis consists of a textual and graphical part. The textual section briefly describes the basics of the household water supply and sewage installation, and it presents the existing state of the water supply and sewage system in the city of Pula. The technical description lists the adopted solutions for the household water supply and sewage installation of the specified building, which are based on hydraulic calculations conducted. Lastly, it provides a detailed description of the expected costs. The graphical part includes drawings: a site plan is attached with marked locations of the public water supply and sewage system, floor plans depicting the water supply distribution within the building, floor plans illustrating the drainage of wastewater and rainwater, diagrams of the distribution of hot and cold water, a schematic representation of the sewage system, and specific characteristic details.