Make kitchen island larger?

The island in my kitchen is kind of small. There is not enough flat space to put a pot or pan next to the stove.
Can I replace the top of the island and make it a few inches larger in all direction, or is there a building code or guildline on the clearance between the island and the surrounding cabinets?
I don't know why they made the island so small. The house was built 20 years ago.
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General guideline for ktchen and bathroom spacing is 4'. If that seems unnecessarily large, use whatever you like if you hips are small enough.
Joe
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