Dear ksp
The cost of construction is based on the plan ,elevation and specification used in the construction of building. cost is also co related with types of foundation,earth quack measure. For accurate costing you can e-mail at support@gharexpert.com for detail estimate.See the link below.
http://www.gharexpert.com/Estimator/detailed_cost_estimate.aspx
Thanks a lot sir for estimator. However I didnt find alumnium sliding windows in it. also there are no details for verious vitrified tiles like anti skid, sizes 24x24,16x16,etc. My contractor is stating the rate at Rs.1050 to1100 per sq feet. It excluding demolition cost of standing stucture of 600sq feet which is 20 years old and bulit in load bearing stucture. demolition cost is stated by an other contractor is Rs.50000. My question is 1) Are these cost viable? 2) how much material from demolition stucture can be reused as buliding contractor said he will be using steel from old slab at plith level to strenghthen foundation?