That goes for pretty much anywhere. Most agencies require 3 sets at a certain size plus one extra elevation page.
Once you open up the wall on the existing structure your going to have to place a beam with a post on each end. Beam and post size will have to be calculated. In addition, the load has now transferred to each end of the beam which means a new footing on each side. Another thing is that once you have opened up that wall it has lost it's shear value and an engineer is going to have to figure out what hardware and material to use to regain it's shear value.
My recommendation, get something drawn up and engineered then make your phone calls. You are wasting peoples time when you dont have a set of plans. Gas and time cost money.
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Gaetano Cosentino
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