Capacity and credit requirements vary by department
How many double-major or minor students a department accepts, and how many extra credits are required, are both set individually by each department and school, so the accurate procedure is always worth confirming directly through your own school's academic system and the target department's own announcements before you apply.
A heavier course load is worth planning for
Taking on a double major or minor generally means carrying more coursework at once, which is worth planning around rather than discovering the hard way mid-semester. Structuring a regular study group with classmates in the same courses is one practical way to keep a heavier workload manageable without it eating into every other part of your schedule.
Frequently Asked Questions
Does a double major delay graduation?
It can -- the more additional credits you need to complete, the more likely your graduation timeline slips, so it's worth calculating how many credits you can realistically complete in your remaining terms before you apply.
Can I drop a double major partway through?
Yes -- most schools accept a request to drop a double major, but how the credits you already completed in it get treated afterward varies by school, so check with your department office.