<p>A minor is simply taking a lot of semester hours in one area of study but not enough for it to be your major area of study. Minimum number of semester hours needed for a minor varies somewhat and depends on minor chosen.</p>
<p>Architecture is not interior design and it does not train you for it. </p>
<p>You cannot minor in interior design at UIUC because UIUC does not have interior design.</p>
<p>A correction if you are thinking of design of the interior stricture -- e.g., where to place and size of rooms, heights of ceilings, wall and door structures, size and mechanics of windows -- as that is part of architecture but not a minor for it.</p>