BUILT UP AREA vs CONSTRUCTION COST PER SQFT, WHAT ARE THE THUMB RULES FOR FINDING OUT THE CONSTRUCTION COST PER SQFT

1) I WOULD LIKE TO KNOW IF BUILT UP AREA  IS REDUCED, CONSTRUCTION COST WILL BE INCREASED OR NOT ? 

2)WHAT ARE THE THUMBRULES FOR FINDING OUT THE CONSTRUCTION COST OF

 G+13 APARTMETNS, BUILT UP AREA COMES 1 LACK SQFT
VETRIFIED TILES IN BED ROOMS & HALL, CERAMIC IN KITCHEN & TOILETS, 88 APARTMETNS, 4LIFTS, 2SUMP, 1 BASEMENT, 3 TOWERS, SWIMMING POOL, CLUB HOUSE, CHILDREDN PLAY AREA, FLUSH DOORS, 2 TRACK ALLUMINIUM WINDOWS WITH 10MM WINDOW GRILL , 2M EXCAVATION WORK, 8" BLOCK MASONRY OUTER WALL, 6" INTERNAL WALL, INTERNAL 12MM PLASTERING, 20MM WATERPROOFING FOR EXTERNAL WALL, EMULSION FOR INTERNAL & CEILING WALL, EXTERNAL WEATHER SHIELD,COMMON AERA TEXTURED PAINT

A) EARTH WORK

B) P.C.C.

C) R.C.C.

D) REINFORCEMENT

E) FLOORING

F) WATER PROOFING

G) STRUCTURAL WORKS

E) DOORS & WINDOWS

F) MISC WORKS

G) MASONRY

H) PLASTERING

I) PAINTING