????? We need to see a to scale plan of the space as it relates to the bedroom and the garage,Accordian doors where ?

Does no one ever use google.?

Just googled and quickly came up with these link that shows several configurations for small powder room.

https://theurbandecor.com/2021/06/05/narrow-powder-room-layout/

https://architectwisdom.com/powder-room/

Post pics.

A 3'x6' room (18 sf) is as small as is usable for a powder room. The components can be on either short end, facing each other, with the door in the middle, or they can line up on the long wall, side by side.

can you install a pocket door?

Can you draw a little sketch of your guest room and garage with measurements? It will yield a lot better feedback.

I haven't seen an accordion door in years. And I never met one that closed well. That could be another option. I've used French doors as well on a small bathroom in Scotland and hated having to turn around to close two doors behind me in such a small space. I'm usually not a fan of pocket doors on bathrooms, but I used one in a BnB in Italy last month that was actually tight fitting an fantastic.

I used to live in Philly where lots of small bathrooms had a toilet on the back wall and a small sink on the side wall. We installed that foot print too. Don't know if this layout is of interest. With a recessed medicine cabinet, and recessed shelving above the toilet, you could get a lot of room for guest toiletries in there. The layout looked like these.

Tiny Powder Room · More Info

Black & White Tiny Powder Room · More Info

This is a nice layout for a door that swings in. I presume the toilet is to the left.

Brooklyn Heights Townhouse · More Info

Before you do anything, check if there is a code for the sq ft of the powder room or a specific for spacing in front of the toilet. There used to be restrictions on size - they have loosened up a little over time.

Also , it is hard to tell you whether a square space vs a rectangular space is better without a quick drawing of the garage and where this bathroom would be bumping into it.

No, codes have not ”loosened up” over time. That’s a ridiculous statement and just shows that the person doesn't even understand the codes cycles. Codes have actually required more clearance space over time, not less.

Well, I certainly do not have that much space in any bathroom of mine, nor in most bathrooms I've ever constructed or lived in. Maybe it is because they were older homes, grandfathered in?

And yet I still see powder rooms being approved and installed under staircases, etc . You are posting side by side codes for a full bath - they are asking about a powder room which can be side by side or opposite or adjacent. They need to see the code specific in their town. That is what we do here, so there is never a question.

Please do not assume what I know and do not know.

Find someone else to insult - I'm really not in the mood. Have a nice day

It doesn't matter if the sink and toilet are in a powder room or a full bath, the same code requirements apply to both. It is not possible to put a toilet and lavatory in a 3'x6' room and meet code if the toilet is backed up to the long wall, no matter where the door is, unless there's somehow a wall-mounted toilet that's only 15" deep. There needs to be 21" (24" in some jurisdictions) clearance in front of the toilet.

Code applies to new construction; there are no code police going around checking if old installations meet new code requirements, whether it be plumbing, electrical, building, or mechanical.

It is certainly possible to meet code requirements when putting powder rooms underneath stairs, but it is not a given due to differing circumstances in each house.

Here are several shapes of powder rooms you could consider:

Just Google Powder room configurations and you will see many ideas.

Good luck