In sector G-13 g-14/4 and even now G-15 are good for that purpose try to buy a small size plot 30 x 60 is good as usually small homes gives good profit plus it's easy to sell. Construction cost would be around 4 million if you will build it by your own with normal standards. Yeah it as better then many other business but it depends on you like its a tough work labor is always very difficult to deal otherwise profit is good in construction.
Thanks for your kind advise. Normally how many time take for construction and sale.really i appreciate your help for those who is new in these filed. My Allah reward you for helping others. What's now a days rate in G-14/4 for 30*60 plot.