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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?
 

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Such an addition would have to meet code, starting with footing and foundation.
Your proposed plans should illustrate this.
You take the plans to your building department for a plan check.
 

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First things first: Are you in an region subject to frost. and then if you are, does the foundation of the porch extend below the frost line?
 

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Can you bump the addition out 9 ft, build a proper foundation wall, and just cover the concrete porch? Since you have 16” of height to work with, it shouldn’t be a problem. I would be concerned with using the porch as part of the structure, too much chance of differential settling or heaving.
 
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