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I suggest you hire an architect, who will plan your new second floor.
You will need permits for both the demolition, and the new construction, and an architect will be very useful for both. Likely even save you money and make your new add-a-level more valuable in the long run.
Adding a level, is NOT a homeowner's weekend project. In fact the demolition needs to be cooridnated with the contruction of the new level. You need to upgrade and expand mechanical, plumbing (usually) and electrical systems...and unless you're a GC...should be farmed out to qualified individuals.
If you are a General Contractor, I am very nervous about the the question your asking.
-bear
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It's alot easier to ask for forgiveness then it is to ask for permission.
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