In an average height building, let us say 10 to 15 storey building, with raft foundation what is in your opinion should be the consumption of cement and steel per square or per sq, meter of the floor area?
yes it depends on so many parameters and a building has to be designed for wind load if it is 10-15 storey and also it has to be designed for the EQ loads say moderate earthquake. In that case and if you are using steel of HYSD bars of grade 400 i.e 400 N/mm2 and cement of 28 days strength of 42 N/mm2.
For example in 3 to 4 storey buildings with isolated footings the amount of steel of above grade is approximately equal to 4.0 to 5.0 kg per square feet of the floor area.
This information is essential for quick initial estimate of major materials.