Bathroom accessible from 2 sides - What kind of locking system?

Hello dear ones. So far, I have only been an active reader and today I am writing my first post: In our floor plans, we have planned a bathroom on the ground floor that should be accessible both from the inside and from the terrace. The background is that we would like to build a pool in the garden and then want to have a way to reach the restroom or the shower without having to walk dripping through the house. What we are wondering is whether it is possible to have both locks locked simultaneously when closing one door. Even better would be, of course, if the lock could be set so that the door remains naturally locked from the outside when I enter the bathroom from the inside and also leave it again, so that there is no ideal access point for unwanted guests at night. I hope you understand what I mean. It is complicated to describe.

Hello everyone. So far I have only been an active reader and today I am posting for the first time: In our floor plans, we have planned a bathroom on the ground floor that should be accessible both from the inside and from the terrace. The background is that we want to build a pool in the garden and then have an option to use the restroom or shower without having to walk through the house dripping wet. What we are wondering is whether it is possible that when one door is locked, both locks are locked simultaneously. Even better would be, of course, if the lock could be set so that the door remains naturally locked to the outside when I enter the bathroom from the inside and also when I leave it, so that there is no ideal access route for unwelcome guests at night. I hope you understand what I mean. It's complicated to describe.

Are you building kfw55 or better? The door must accordingly have a good U-value.

I would simply take a towel outside. Seriously: I find two doors in the bathroom uncomfortable and impractical.

Or simply put tiles everywhere + get a vacuum/mopping robot. Then everything is clean :-)

In our floor plans, we have planned a bathroom on the ground floor that should be accessible both from the inside and from the terrace. [...] I hope you understand what I mean. It is complicated to describe.

Oh, always those people with the invisible floor plans (who verbally admit that they are aware of the difficulty in understanding - but do not realize that a picture is worth a thousand words).

:D... totally forgot to attach the picture... But it is actually just a brainstorming draft...