How to improve mezzanine bedroom

[3littlelambs]

My son is buying a small detached house. It was originally a one bedroom property with the bedroom as a mezzanine above the living/dining/kitchen area. It had a proper staircase up to it and ensuite bathroom so was ideal for single/couple. Bedroom also has two velux quite high up.

It was extended a few years ago so has 1 proper smallish bedroom and original mezzanine bedroom. As he may want to share the mezzanine is not ideal. Any ideas on how to enclose the room? Had thought about a curtain but feel a more permanent solution would be best.

Thanks

Bump - does anyone have creative ideas to enclose the mezzanine to create a more private bedroom- has a row of banisters at the moment.

Thanks

Photo is terrible but the normal solution would be a stud wall with plasterboard each side and jointed or skimmed.
Should be pretty economical or if you're good with DIY it should be doable.
The main thing is to watch out for building regs, you can get away with one or two things if you have a mezzanine that you wouldn't with an inner room.
This is because a fire would be obvious earlier with a mezzanine but might be out of sight if there's a wall.
So you might also need to upgrade your means of escape with fire doors or escape windows to comply with regs (and make it safer)

Thanks, that's very helpful. There are already velux there but they seem high. Would you know if you have to upgrade both velux and fire doors or whether you could just upgrade one?

You'd have to have a compliant escape route, which is unlikely from a velux window. Maybe fire doors would be more feasible than cutting into the roof, but you'd really need a surveyor or similar professional to advise.

I can't help thinking that there's a good reason it was built as a mezzanine, if it was that easy why wouldn't it be a proper room in the first place?