So I arrogantly stopped the construction work for arnd 3 days and told them I dont need chained stairs. Thats when he started to negotiate.Then I spoke to Centering and barbending guys and asked them the split up for the amount he is asking.
Rates for silver wood that they use for centering is very less and they reuse the material. New wood for the entire staircase costs abt 4000 Rs for 20 steps. So ideally these guys should be asking 4000 + Labour charges for 1 day. But these guys are looting.