I’ll start with a comment so our plan posters see it. Both Reece and IKEA have bathroom planners you can use to try out ideas. You’re trying to put a lot into a narrow space. It would be handy to post a handrawn layout with measurements and noting windows. Are you on a slab or stumps? If a slab, are you prepared for the cost of moving plumbing services.

you will need to allow enough space for the fixtures to be installed so consult the plumber and tiler before committing to any purchases but there should be enough space for a modest sized bath and toilet, big shower and vanity but i suggest that a wall hung vanity will help the room feel more spacious

"I've been advised that a freestanding bath and a separate shower is a nightmare to clean."

I don't know you can generelise about that as it depends on the materials and the nooks and crannies of the design. One thing about freestanding baths is I've seen so many installed not freestanding but pushed against a wall. But there are 'freestanding' styles these days designed for against walls and in corners, avoiding the hard to reach gap at the back.

Who is going to be using the bathroom? Is climbing over the side of the tub to have a shower going to be difficult or a nuisance? Is space needed for a lot of cleansing products or a few? What about towel rails?

as it has been correctly pointed out, the entry is on the short wall, so another variation to consider...

With only 1500 width you don’t have room for free standing

I'd have either a bath OR a shower in a room that size. Having both will be very cramped and could affect resale value.

I probably agree. I'd be put off by a freestanding bath for a freestanding bath's sake if it compromised everything else about the room. I've seen good ones and I've seen 'why did they bother?' like they bought everything in the bathroom showroom but I wouldn't want to use it.

Is it your only bathroom and how many bedrooms does it serve and do you use a bath often and when you say "will be" can you still change anything? Still wondering about the slab or stumps questions too, which is important for talking plumbing?

Now with floor plan (still 1500 at the far end) - thanks for all your comments. It is the 'family' bathroom so the main one really - a small ensuite next door that will have just a shower. I think the seperate bath / shower and screen between the vanity is the best idea ...

Your plan. Top of this post wastes room around the shower compromising the shared space for vanity. The sketch by dreamer is the best use of space, but as per your plan building in the toilet cistern and putting a ledge above cistern can be great storage.

It's 1500 where the bath is on the current plan - then widens to 1638 - the arcitect made an error on the plan.

On the architects plan is that an enclosed shower recess? If so, it’s a shames to have a standard small shower in a new bathroom. If not and it’s open, then the shower screen doesn’t seem long enough to meet the regulations and will need checking.

Hello Surfybird1, I think at 1500 wide the room is just wide enough for a drop in bath at the far end: check out what baths are available. Next have the shower with a glass screen. Wet style they call it. Towel rails opposite this do not get wet apparently. then if you need a toilet in this room make it next to the shower with the vanity to the end nearest the door. so 900 wide bath, 900wide shower, 900 wide for the toilet leaves 1200 for the single vanity which will be lovely. It may all depend on the length of bath you can acquire. Enjoy!! Margot