Generally speaking or by thumb rule its cost about 1400 Rs per Sq.Ft in chennai for an residential duplex house. one can arrive at that cost with the materials and specifics involved.

Steel – good brand
Sand – Fine Quality with less iron or clay mix
Stone – 20mm sizes
Cement – penna/cormandal/ other brands
Doors – Teak frames with putty doors
Electrical – anchor or equivalent
Bathroom – parry ware or equivalent
paint – Asian paints or equivalent
Floor – Khajaria Vetrified tiles or equivalent

these are some of the general brands. when one wants to get their construction buildup one needs to understand their needs and then approach the contractor. once you give us the proper requirement then we give an detailed breakup of the actual cost. costs will differ from place to place and trype of construction.