A response surface methodology (RSM) was employed to model and predict the fresh and hardened properties of powder type light weight self-compacting concrete (LWSCC) produced with coarse grained light expanded clay aggregates (LECA) as partial replacement of normal weight aggregates (NWA). Two mix design parameters were selected to derive mathematical-statistical models for predicting thirteen LWSCC properties. Volumetric ratio of LECA to total aggregates (LV/AV) of 40% to 60% and high range water reducing super-plasticizer (Sp) of 0.78 to 0.89% (by weight of cement) were utilized for designing and testing of fifteen LWSCC mixtures in which the contents of other mix constituents including cement, lime stone powder (LSP) and water were kept constant. Marsh-cone flow time of each respective paste was measured for determining the appropriate range of Sp dosage. The influence of mix design parameters on the responses were analyzed and discussed. Utilizing the derived models within the studied domains, the optimum parameters of LWSCC mixture satisfying the EFNARC criteria for vertical applications in structures with complex shapes and very congested reinforcements were obtained and verified with high statistical desirability.