We modelled Urban Heat Island (UHI) impacts for a dense mixed‑use development to understand how massing, materials and landscaping influence local microclimate and thermal comfort. Using CFD coupled with energy and thermal modelling, we represented radiative exchange, surface properties such as albedo and emissivity, surface roughness and realistic meteorological boundary conditions. The study considered seasonal scenarios, peak summer design days and prevailing wind directions to capture dispersion and ventilation corridors. The analysis focused on wind microclimate, natural ventilation potential and pedestrian comfort, including temperature fields, mean radiant temperature and heat‑exposure hotspots around entrances, canopies and the public realm. Mesh strategy and solver settings were selected to capture street‑canyon recirculation and shear layers while maintaining turnaround time, and sensitivity checks on material palettes and greening strategies, including trees, shade structures and high‑albedo roofs and paving, quantified the relative benefit of each intervention. Clear, decision‑ready maps and profiles showed where overheating risks concentrate and how specific mitigations change comfort metrics without unacceptable trade‑offs in airflow. Recommendations prioritised high benefit to effort measures such as targeted shading, reflective finishes and ventilation corridors, supporting planning dialogue and reducing risk in design iteration. The workflow is reproducible, pragmatic and simple to extend as new site data becomes available, enabling the client and stakeholders to demonstrate environmental performance early in design.