This study investigates the torsional behaviour of light gauge steel (LGS) sections under elevated temperatures using finite element analysis (FEA) in Abaqus. The research evaluates the effects of temperature on mechanical properties and torsional resistance in C, I, and Z sections, with and without stiffeners. Elevated temperatures significantly reduce the yield strength and stiffness of LGS sections, impacting their load-bearing capacity. Comparative analysis is conducted between numerical simulations of various sections to assess Shear Stress, angle of twist, ultimate load and displacement. The inclusion of inbuilt stiffeners improves torsional performance by reducing deformation and enhancing overall section rigidity. The findings provide valuable insights into the impact of heat exposure on LGS sections and the role of stiffeners in enhancing resistance to torsional deformations, contributing to the development of fire-resistant LGS structures.