The final thesis focuses on designing plumbing installations for a smaller residential building to ensure a functional and reliable water supply system. The introduction explains the importance of proper water supply system design and optimizing the pressure so that water can be delivered to the most distant parts of the building. The first part of the paper consists of a textual description that includes an introduction, a technical overview of the system, and a hydraulic calculation of the water supply system. The second part of the paper includes a graphic representation, with floor plans of the building and an indented water supply network, where the arrangement of pipes and their dimensions are clearly shown. The technical description covers the key components of the water supply system and their technical specifications. In the practical part of the work, the flow calculation was performed, and blueprints provided a graphical representation of the designed system, allowing a clear visualization of the solution. Calculations follow the Joseph Brix method, used to size the pipeline and determine water flow.