Thanks active builders, I thought 1.8m depth for the wet area - assuming bath is 80cm wide that leaves 1m depth for the showering area, but then that only leaves 1.2m to fit basin and toilet, which I thought might be a bit tight? We don’t really want a small basin as this is the main bathroom. My other option is to have toilet and washbasin opposite each other in the 1.2m run, but then this leaves a 80cm gap between toilet and washbasin and not sure if this would look a bit cramped?

If you are thinking to tuck a chair under so that’s out of the way, I would perhaps go He length of a chair and just over, to give room to put things on the desk itself. I measured my standard minimal but comfy dining chair and that was 40cm excluding the backrest. So perhaps go 45cm wide? Also think about using a ‘leggy’ chair, just like in the photo so it doesn’t take much visual space.

Obobble and Suzanne C, thanks for the comments. I think the idea of putting the shower and toilet along the right hand wall is a good idea. Do you think there would be room if I put the vanity unit parallel on the opposite left hand wall, rather than underneath the window? (Sorry I like the idea of having a mirror in front of me rather than the window obobble!) Also what do people think are comfortable dimensions for a spacious walk in shower? If I put the shower in the back right hand corner then I’m not tied so much by the width of the window I think as it won’t jut up next to it? Ie it could be wider that 76.5cm?

It depends on a lot, like the shape of the room, the access points and dimensions around the room and so on. If you imagine that the ideal depth would be a minimum of 500mm (up to 600mm) for hanging space in open units - depending on what you are hanging or shelving. And you would want around 1m for dressing and access - it should give you a good idea. Here is a plan view which may help you. fingers crossed. This is what I would be looking for ideally in terms of dimensions for that layout. I hope it helps, regarding, Gina