Mohammad Waseem Qasim

salam alykum I want to build 3 floor building on my 128 sqy corner plot after demolish old house in korangi 5 area karachi ,, i already draw map myself (attached) but i could not give sizes of rooms,bathrooms, hall,kitchen,stairs, etc etc actually i don't have any idea regarding construction, and i am afraid about labor and contractor which easily cheat me in this process to use low quality materials, can anyone engineer help me out in this issue ...