Pls provide me Estimation for Outside Staircase?

hi friends we constructing a house 1st floor in chennai total 1600sq.ft .builder is approved to build rs .800 per sq.ft. now he saying outside stair case will be extra sq.ft he is asking rs.800 per sq.ft
(total area for staircase is 390sq.ft, number of landings is 2) pls guide me

if building construction sq.ft rate is Rs.800

what will be the outside staircase sq.ft rate ?? pls guide me thanks
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