When you plan to remove or relocate a wall(s), the key factor to determine is, by so doing, will you encounter a load-bearing situation? This occurs when the wall(s) is part of the support system for the structure of the house. Usually a contractor can determine this. If the contractor is uncertain, you will need to have a structural engineer examine the structure to make that determination. If it is non load-bearing, when you are ready to start construction, the contractor can proceed to build out the space per the new plan. If it is a load-bearing issue, your local building authority will require that you retain a structural engineer or an architect to design a structural solution for removing or relocating the wall(s).
He or she will submit design drawings and calculations of the solution, to the building authority for approval and permit. Upon receiving the permit, when you are ready to begin construction, the contractor can then proceed to build-out the structure per the engineer's or architect's specifications. This is the process in California, based upon the state building standards, Title 24. The process in the other states is very similar.
You may prefer to be able to eat in the kitchen by having an island with seating. The size of the island that the room will accommodate will determine how many persons you can seat. Seating at an island reduces the storage space available in the island, so the balance of the kitchen storage will need to absorb this loss. You can basically sit at three counter heights: chair height (29-30"), counter height (36") and bar height (42").
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