Cost of meshwork box and slope roof

[jayanthdoc]

I am constructing on a contract basis. Doubtful about contractor's costing for constructing mesh work boxes (5' X 4') around windows. He has quoted Rs 183 per sft. Compared to basic plastering cost of Rs 20 per sft, this seems exhorbitant. Also, for sloped roof meshwork (5.5' X 3') the cost quoted is Rs 128 per sft. I saw some of the other BOQs posted by other members and the cost was a lot less. Are the costs quoted above reasonable?
Many thanks for your imputs.

Jayanth