Fiber-reinforced Polymer is increasingly gaining acceptance as a suitable alternative to steel bars for concrete reinforcement. Corrosion has caused carbon steel-reinforced concrete structures to collapse permanently. Harbors, airports, submarine infrastructure, and several public projects need substantial financial investment. The vulnerability of these structures to corrosion reduces their service life. Conversely, producing BFRP rebars from natural basalt rocks reduces CO2 emissions and improves durability when used as reinforcements. BFRP (basalt fiber reinforced polymer) rebar lacks ductility while having a greater tensile strength. Basalt fiber-reinforced polymer rebars are four times lighter than carbon steel, more corrosion resistant, and have superior mechanical qualities. The BFRP-RC slabs show the greatest deflection, but the linear elastic FRP (fiber-reinforced polymer) bars break and cannot be ductile. This research looks at how to design, the bending strength, and the usability of rectangular concrete slabs that are reinforced with BFRP, following the ACI 440.1R-15 regulation. It also examines the costs related to three different slab depths. It also includes a parametric study analysing the costs associated with three different slab depths.