I had an architech custom draw the plans I wanted, an engineer work with the arcitech while he drew the plans and approved the plans and purchased all the materials or at least made damn sure what got used was matching EXACTLY what the plans called for,and above minimum standards by a noticable margin. then I hired subcontractors WITH REFERANCES for most of the external structure(floor,roof walls,ETC.) and did most of the plumbing and all the electrical myself
and WATCHED THEM CONSTANTLY and had both the engineer and the inspectors over so frequently they knew me by first name, and voice on the phone!
Ive always felt, if you can,t do it to the highest level of quality you can possiably afford theres a problem somewhere
example
why use 2400psi concrete if 4000psi concrete is only a few extra dollars a yard, if #5 rebar every 4 feet in the slabs ok, then # 7 rebar ever 3 feet is better,if a 3" thick slabs ok, an 8" thick ones better, if 2x4 rafters are ok, 2x8 rafters are better, if 12 ga wires ok, 10 ga is better..yeah it does add up but look at the differance in the finnished product, do you really want the minimum that just barely gets past inspection???? I sure never did!!