Upsizing from Single Gang to 2X: Good way to cover extra opening?
I would like to tap into an existing single gang nonmetallic box that currently contains a receptacle but is at its box-fill limit (at 18 cu. in.). The reason for tapping in is to add a receptacle on the opposite side of the same interior wall. The existing box currently has a receptacle, two 14-2 cables, and a 14-3 cable, so I believe it is at its max.
I want to add one more 14-2, so I think I now need 22 cu. in. total, so a 25 cu. in. double gang box would do the trick. But how do I keep things from looking weird? (It's on a bedroom wall.) An easy thing would be to add another receptacle side-by-side (taking the box fill to 24 cu. in.), but that would look funny in a bedroom. I would hate to have a blank plate covering half the box.
I'm sure this has happened before... I would appreciate any ideas. Thanks!