If you need extra storage in the galley kitchen, install tall kitchen cabinets that go all the way to the ceiling. Wall storage is crucial. Buy a stepladder to use when you need to reach the upper shelf of the cabinets, and place the items you use less frequently on the upper shelves.
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.
Examples: Do you often make spaghetti and pasta, which requires filling a large pot with about four to six quarts of water? If so, you should have a pot-filler over the cook top or range top. Since there are only two of you and it takes a long time to fill up the dishwasher before you can wash the dishes, you should consider a two drawer dishwasher which enables you to wash one drawer at a time, thereby saving energy and providing you with clean dishes more often. Do you prefer an air switch in the countertop for the disposal or do you want the switch to be on the backsplash? Do you want a garbage disposal in the prep sink as well as the main sink? Do you want soft close on your cabinet drawers? Do you like the idea of pendant lighting above the island? Do you want a filtered water system? The questions go on and on!
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