Hire a Kitchen and Bath designer if your architect is inadequate at planning that portion of the home. Or a better architect period.

thanks

We would need to know the location of the window(s) and the flexibility on the location of the bathroom door. Is a single sink vanity ok?

Should be fairly simple. Who is designing the
house? There's probably a few options, but something like this, door on right
or bottom wall, window above toilet, or on right wall. rotate it any way as
needed. If you use a tub, you may need to increase the width, this shows a
shower, and 8ft width

ok pic isn't posting. basically, rectangle (end closest to you ('bottom') is a width)

toilet - bottom of left wall

vanity - middle of left wall

5ft long shower - top left corner

washer/dryer - top right corner

leaving the remainder of the bottom and right wall for a door