This thesis explores how parametric design, with its techniques and tools, can support urban planners in the early stages of planning by enabling the generation and evaluation of multiple design scenarios based on municipal regulations and urban principles. Parametric tools use data as input to produce a range of alternatives, allowing planners to test, analyze, and select optimal solutions according to specific criteria and needs. Following a review of the topic, the research focuses on extracting key urban principles such as density, mobility networks, geometry, and space syntax and translating them into parameterized formats suitable for computational design tools. To evaluate the practical value of this approach, a parametric design process is applied to a real urban site in Turin, Italy.