Do you understand the legal space requirements for a bedroom? And the egress window (plus other things) that a bedroom will need?

I am unable to attach photos at this time. This space will have a closet. A professional builder will be adding the wall and door. I am simply looking for suggestions on adding light to the hallway.

Would transoms help? You could have a solid door, but some light above it. I see few *bedrooms* with French doors. What are your options for lighting the hall with ceiling or wall fixtures? Is this an upper floor? Would a light tube be an option?

Have you considered installing a skylight above the hallway for natural light?

If your roof framing is trusses at 24-inches on center, you could install a skylight so that it's centered between two trusses, add a gyp boad-clad opening to the ceiling above the hallway and have light all day long.

Either way, it won't add any additional value to your home. I'm an appraiser. If I were to appraise your property, I would increase valuation if you added square footage, finished incomplete interior space or added a bathroom.

This doesn't mean that this space won't be more attractive to a potential buyer. It might make the home more easily marketed with an additional bedroom. It may make the space more usable for your family. It just won't add to the total market valuation. So, don't do it for that reason. Do it because you want to do it.

IMO a bedroom with no bathroom nearby is just a room so I would leave it an open loft . I am trying to figure out why you chose a design with a loft if you didn’t want one .Also with small kids a glass door or the stairs would both be an issue if used as aplay space.