<p>You will have to talk to the engineering department to see if they will allow you to double major.</p>
<p>However UCLAs policy on double majoring in most cases is that before declaring a double major you have to complete ALL preqs for both majors and 2 upper division courses in both majors b4 they let you declare the doubles. However in your case you will run into the problem of actually getting into the engineering school to begin with. You need to contact engineering now and ask them what steps to take to double major with a major in their college. It would be much easier if it was within the same college. Engineering is more difficult to get accepted into than College of letters and sciences.</p>