Good article Syyed. Although, it would be more helpful if you can tell us how you came up with the numbers of construction cost. Coincidentally, i have been working on an estimate for construction of house with covering area of around 4000 sqft and I came up with the same number as you i.e 1600/sqft for average finishing.
I have no actual experience of house construction and the estimates are based on current market prices for raw material and labour rates. Anyway here is the detailed breakdown:
Architect: 100000***
Boring: 140000
Sand/Crush: 220000
Bricks: 382500 @ 8.5 x 45000
Cement: 445500 @ 495 x 900
Steel: 588000 @ 85000 x 7{tons}
Water proofing and heat insulation: 150000
Marble: 320000
Marble (outside covered area): 150000***
Pipes: 310000
Electric Wires: 160000
Electric Fittings: 150000
Grills & railings: 295000
Aluminum Windows: 174000
Main Gate: 90000
Glass Work: 45000
Stone Wall: 90000
Paint: 280000
Woodwork (Doors, wardrobe, kitchens): 400000
Wood polishing: ?????***
Hardware Fittings: 90000
Bathrooms: 300000
Utility Connections: 120000
Labour - Civil Work: 1000000
Labour - Electric: 150000
Labour - Sanitation: 150000
Labour - Paint: 100000
Labour - Carpenter: 250000
Labour - Guard: 70000
It all adds up to a grand total of 6460000 (6710000***). I may have missed something but then again it is all a rough estimate. Experienced members and professional builders maybe able to point out some points I may have missed.
***Modified after BR Malik's input.