Recent studies in-slab systems show possibilities for advancement in the conventional techniques of slab casting. Contemporary developments in the field of design of RCC slabs are associated with Flat and Grid slabs. Flat Slabs are highly advantageous in construction, as they provide minimum depth, less material, speedy construction and tolerate non-uniform column grids. The flat slab rests directly on the column, and the thick beams which are present in the conventional slabs get fused in the flat slab only. Drop panels or column heads are used in case of heavy loads to resist shear failures. Flat slabs are convenient for fire and acoustics treatments and also provide aesthetical flexibility. Grid or waffle slabs have closely spaced beams perpendicular to each other at regular intervals with the slab resting on them. As they provide greater spans, they are generally used for large rooms such as auditoriums, theatre halls, malls etc. This paper focuses on the economic comparison of the conventional, flat, and grid slabs separately. For the above objective, buildings with varying numbers of storeys and different slabs are analysed.