Get a "real" contractor. You know how hard it is to be tough with a relative. You can with a contractor especially one who knows his job.
Your 10 - 20 % savings could be wiped out by mistakes and code "flags". How would you like to build a room and then inspectors red flag it and have to remove it?
have it done right and by a contractor, of course this decision might cause family trouble. Its a tough decision, but its the right one.
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