I'm putting hardwood floors in my kitchen and living room, which next to each other. The kitchen has vinyl flooring, so it is slightly higher than the living room, which has carpet on subfloor. I want the hardwood to be at the same level in both rooms so I don't need a threshold between the rooms. Is it possible to remove the vinyl? I imagine it is glued down.
Definitely remove the vinyl no matter what the subfloor is. Especially if it is on particle board. Do the job right and don't listen to so-called carpenters giving bad advice and cutting corners. Remove that particle board too and add plywood to get your heights level. You will never be disappointed doing a job the right way!! Good Luck
The vinyl is very likely glued to particle board, which is attached to the subfloor (the subfloor can't be particle board because it's not a structural material). This is the way our kitchen was done.
Removing it is fairly simple; make cuts about 2' apart with a circular saw set to cut only through the particle board. You can then pull it up in sections. I would use a "remodeling" blade that is capable of cutting through any nails you might hit.
I definitely recommend to do this; getting the same height will give you a much better result.