Foundation for "bump out" addition.

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tmy23

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Thank you in advance for all advice...

On the back of our home is a concrete "porch", or stoop. 8'x15', it is about 18" above grade. It is a 4" slab sitting on a concrete foundation. Stepping into the back door of the house is 1 step up and then through a small "mud room" is another step up into our kitchen. We'd like to bump the back of the house back 8', in essence a 15'x8' addition over the footprint of the current porch. We want to run the continuous floor level from the kitchen back to the end of the new "bump out", so out at the porch, the interior floor level would be 16" higher then the concrete porch surface. The addition will be a single story, 8 foot frame walls tying into the back of the house. Roof line is a simple extension of the "A" which runs back from the house.
Question. Can I use any or all of concrete porch as the foundation for the bumpout? Can I fasten wooden beams across the concrete porch, then floor joists at 90 and frame walls up from the perimeter?

Thank you for all help?
 
Your local building dept. will have a list of proofs and approvals, for you.
 
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