The planning process will continue until every aspect of the total kitchen design is selected and specified. However, once you have established your footprint and vertical space, how you want to utilize your kitchen, how and where you want to eat, and your design motif, you are more than half way there. The planning process continues, on a smaller scale, as you are making more decisions about all of the items and issues that make up a total kitchen design.
Of course, if you don't create an addition to the house, and just remove or relocate a wall(s), you then have infringed upon a contiguous space and decreased its size, so you have to weigh which option is the best for you. Is it worth giving up the other space to increase the size of the kitchen? In my experience, if you can do without the adjoining space, it is much better to devote that extra space to the kitchen.
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).
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