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I will say this - The BEST approach is to hire an Architect. They have answers to ALL the question. You really want the Builder to do the, well ..., the building work; NOT the design work. Architects do designing and Builders build. It's money well spent! Oh, if you only deal w/a Builder on this, you will find that Change Orders cost a LOT! The Builder will simply 'write down' what you want but as time goes on, you may change your mind on 'things'. This is where an Architect's expertise is money well spent. They spend a LOT of time 'up front' to be sure that what you want is 'doable', workable, affordable, and little-likely to change.
Go for it! My best to ya and hope this helps.
Jay J -Moderator
PS: A neighbor of ours is having a 20' x 12' addition put on a Colonial home. It's being built right next to the living room and is only 1 story high. It will have a cathedral ceiling w/a skylight and natural gas stove and bow window. The structure is 'sound'. Cost: $26,000. And no roof is being razed or raised! Also, this will probably cause you to increase the size of your HVAC System and Electrical System. Again, hire that Architect!!!