Can you add a baseboard heater or redo floor in entry area, so that it's heated? Hate to lose that space for year-round use.

I think I would move the bathroom sink to where you have the dryer and add a wall, with a pocket door...making the powder room a separate space.

The dryer could go on the other side of the washer...leave the prep sink 'as is' if possible (when adding wall) and make the area next to it a folding area or extra mudroom space.

If you can heat the entry area, do you still need more mudroom space?

Thanks LL. I think I do still need more mudroom space, even if I heat the existing. It is just not that functional, more of a pass through and I want a place to sit and pull on boots and simultaneously put on coats.
Are you saying to put the dryer across from the washer? I hadnt thought of that. I will play around with that idea.
Thanks again.

I was thinking washer and dryer next to each other. Something like this...
{{!gwi}}From Kitchen plans

With bench under window and hooks above (past window)...with more hooks and a small bench or table, in entry. This would give you a separate powder room space and cute laundry room/mud room area.

Like this... {{!gwi}}From Farmhouse plans

Or stackable... {{!gwi}}From Farmhouse plans

Or make part of the bench a laundry sink, with smaller bench next to it... {{!gwi}}From Farmhouse plans

Could you possibly fir out the entry way to get enough insulation in the walls (and add a heating duct) to be able to switch the laundry to that space? Then use the window in the current laundry to create a door, and do the powder room off to one side? I know you said no add ons, but if the roof of this area lended itself to it, you could do a covered porch type entry into the space from the L formed by the landry/entry space. That would give you a much larger mud room space as well as a powder room for the mud area. It would be heated as well, even if you didn't heat it to "home" standards.

How many inches between the dryer and the left wall, in the drawing above?

Lavender I love the second photo you posted, the stackable one with all the baskets. If I do stackable that will be my inspiration.
Cottage, I cant answer your question because I am unsure what picture you are referring to.
Holly- wow you really thought outside the box I would love to do that. I do not think it would look right from the exterior of the house however. And. the appliances would jut into the door way and that would probably bug me.
The bump out unheated space is actually the main entrance into our house. If we closed off the entry via the bump out people would actually have to walk around it to find the door. I don't think that will work.
Thank you all for your thoughts and ideas. I will keep plugging away.