This research presents a comprehensive framework for the spatial modelling of Indian cities through the algorithmic translation of statutory planning regulations into three-dimensional urban form. With a specific focus on Navi Mumbai as a prototypical case study, the work develops a regulation-sensitive, procedural digital shadow that simulates both present and future urban morphology. By parameterising the Unified Development Control and Promotion Regulations (UDCPR), the model integrates plot-level geometry, building control norms, and development plan data to generate regulation-compliant, rule-based predicted 3D built form. An architectural typology classification system is formulated based on plot size—monoblock, perimeter block, and colony structure—and these forms are encoded into Computer Generated Architecture scripts. A heterogeneous dataset is compiled to construct a baseline 2018 model and the model generates a hypothetical redevelopment scenario for 2038 and 2058 horizon years. Model evaluation is undertaken through quantitative comparison with development plan population projections, visual validation against the actual built environment, and procedural compliance with the UDCPR. The model encompasses various analytical applications, such as redevelopment potential mapping, shadow and daylight simulation, and urban density analysis. A demonstrative application shows how the model integrates with environmental simulation tools to assess performance-based planning outcomes like annual daylight hours. The future scenario reveals a significant morphological shift from mid-rise to high-rise typologies, with an increase in built-up area from 0.54 to 1.85 million sqm, and a projected population escalation from 0.34 to 1.08 million. The paper also explores the implications of such modelling tools for sustainability, resilience and infrastructure forecasting while identifying the limitations of deterministic procedural models. This research aims to bridge the current gap between static regulatory documents and the dynamic realities of urban transformation.