Convert Loft into Bedroom

[Kosh Vokter]

Currently, a 4 bed 2.5 bath, 2 story SFH. All bedrooms are on the 2nd level and there is a big open loft area with windows on 2nd level that's not used much now. Upstairs has 2 bathrooms (1 for master bedroom + 1 shared with the other 3 bedrooms).

Thinking of converting this loft space into a functional bedroom to make it a 5 bed 2 bath house for equity. This conversation would need drywall + 1 door min (not sure if a closet is also need to qualify as bedroom). 

Are there factors that am missing to consider if this conversation would really add equity to the house? I can see some families wanting to use the open loft space as additional entertainment room, or using it as study/office space. 1 shared bathroom upstairs would be shared by 4 bedrooms (instead of 3 currently) - is that somehow less desirable and/or not add a lot of equity?