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.
The kitchen has traditionally been the most important room in the house because cooking and sharing food has long been central to family life. Meals will always be important, but cooking has, in some cases, significantly changed. The grocery industry has focused on replacements for home meals and hundreds of restaurants have incorporated "to-go" in their business model. Whether we cook frequently or not, kitchens remain the foundation of family life because it is where we live and gather. It is where most of us start and end our days and share the information of our day.
In any case, once you have made the decision of whether or not to expand or re-configure, you will know the size and shape (footprint) of the space that you have available from a horizontal standpoint - Plan View.
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