is this a proposed new building or a renovation of an existing space.. either way we need to see the whole floorplan with dimensions, direction of north and where do the sliding external doors lead to?

This is a new building, first floor of a townhouse. The sliding door leads to a balcony and the this room will be the north end of the building.

Is this a master or guest. If it is a master I would design bath bigger for 2 people. A guest room is usually 1 child or short term guest so won’t need to share vanity space. Same with robe.
The wir has less storage space than a robe. That second plan has a more amenable study space, not stuck in an dead end hall.
It is great to have a large bedroom but that needs to match with comparable wir and en-suite spaces. I don’t think either plan has that balance right. What are your priorities ?

if it's a proposed new building we need to see the whole floor plan to make realistic suggestions

@oklouise, This is the first floor proposed plan.

@Kate, the room is going to use as a guest room. it may also use as a study for WFH occasionally.

I Vote for 1. great for guest accommodation, bathroom and WIR sufficient for that and any adult child

i think that the wiw makes both bathrooms too cramped so my suggestion would be to use biws in the guest room including space for a hidden WFH office inside the biw with the window and the work space can be private and secure at a moments' notice and maybe a sofa bed would also make the guest room more flexible

and please reconsider the shape of stairs and use more landings rather than winding stairs and the balcony door at the top of the stairs is too close to be safe and should be omitted

@oklouise, like the idea of hiding the WFH office inside the BIW, but wondering what will be the best option for door, i.e. don't want sliding door with the rail on the floor, swing door will be a bit untidy while working, barn door doesn't suite the overall style, folding door might take up too much space.

sliding/stacking doors would be the best for this space and there are sliding door systems without the floor track so that floorcovering can continue inside the wardobe ...i would have a bulkhead or ceiling height doors and the doors are suspended from a top rail and when fully open the doors stack in front of the storage side and reveal the window and office space...depending on the views the window should allow for wall shelves and/or shallow cabinets and under bench drawers and knee space and a folding chair could stack inside the wardrobe and make sure that you include lighting, power points and phone/internet connections

If you have desk in cupboard it will be only 550 deep and where to you keep chair?

550 is enough depth for a desk whether it be for a desktop/laptop or other

. We did a similar desk within a robe. there's a robe panel beside the desk to section it off from the robe contents

The full height sliding door can be pulled back to the width of the desk or wider and with OKL clever addition of a window really opens the desk space up, brilliant.

I will like a 600 mm desk but I think we have room to make it works.

@oklouise is this you are referring to?

I am also looking at this option

Depth and width aside this is a rough idea of OKLs suggestion