Calculation is fairly very simple. If you are intending to build your house on your own by hiring labor, procuring and providing the material on your own and supervising the site, grey structure without any technical compromises both in material and labor will cost your around 1150 Rs/sqft to 1200 Rs/sqft including boundary walls and all other works outside the covered area. Since you intend to build on 12 to 13 marla only and remaining will be lawn, your covered area will be in the range of 3900 to 4000 sqft (Ground + first + small room at rooftop with bath).
Hence grey structure cost will be 1200 x 4000 = 4800000 Rs
For Finishing cost, since you plan to have a luxury and high standard finish which includes superior quality imported tiles, solid wood work in ash, mohaagni or deodar, italian kitchens, imported steel and ceramic fixtures etc, you will have to keep in mind another 1600 to 1700 Rs/sqft for this type of finish.
Hence finishing cost will be 1600 x 4000 = 6400000 Rs
If you plan for a decent A grade finish then the finishing per square feet cost can come down to 1300 Rs/sqft.
So total approximate cost of your house will be around 110 lacs to 112 lacs.