The Green Building concept has gained momentum in the recent times and new findings are unfolding in the areas of both the green concept and green building components. The present paper focuses on the study of existing cost and future cost projections of green elements like Compact Fluorescent Lamp (CFL), T5 fluorescent tubes, Solar Photovoltaic Panels(SPP) , Solar Water Heater(SWH), Solar Street Lights with Light Emitting Diode Lamps ( LED) (SSL), Rain Water Harvest System(RWHS), Low Flow Faucets (LFF), Dual Flushing System (DFS), Sewage Water Reclamation Plants(SWRP), Bio-methanation Plants (BMP), Autoclave Aerated Concrete(AAC) (building envelope) for finding the Life Cycle Costing of these elements in green residential buildings. Operational Life Cycle Cost (OLCC) of these green elements are directly drawn from the existing market, prevailing rates, district scheduled rates, suppliers, consultants and contractors. The future cost can be projected from Wholesale Price Indices and Consumer Price Indices of these green elements. The Maintenance cost is projected from the Construction Cost Indices.