Check with a hardware store. I have seen "things" you can put on the upper hinges that prevents the door from opening too far. I don't know what they are called...maybe "bumpers" Not sure so ask at the store.

Yeah, but be sure you don't have a hollow door, or overenthusiastic users will drive the stopper into the door itself. (Ask me how I know.)

What's the thing diagrammed on the bottom of your picture? because it's much more natural to have the door swing away from the sink and into the wall, so if that could be removed or shifted, you could just reverse the door and get on with your life.

Your local hardware store (HD or Lowes) has adjustable doorstops that install within the hinge of the door. You can make that work. (Like what ACM shows)

The hinge pin doorstop pictured above works well. In our case, it prevents the robe hook on the back of the bathroom door from hitting the bullnose tile at the edge of the shower surround. That bathroom is primarily used by my nine year old son, so the fact that the tile is still intact is proof positive that those door stops work! ;)

Appreciate everyone's feedback. Thank you!

@Skittish Kitty Be careful with the door hinge stoppers. They can puncture through or dent the door and trim. This is what happened to mine:

First: door was slammed open

Second: our frequently used pantry door

I was wondering about that. I wonder if there's a way to cushion the stoppers so that's less likely.

They're already somewhat cushioned, at least ours are (rubber caps where stopper meets door casing). It's a hassle, but you might consider adding more than one of these to the door in question if you're that worried. You have three hinges to work with... You can also consider adding a clear rubber bumper to the door trim and/or to the sink at the point of contact as a secondary level of protection (they look like small dome-shaped stickers)
Nothing is going to prevent forcible carelessness completely.

There is another type that replaces the whole pin in the hinge and doesn't have bumpers. I tried it for my master bath door, but the new pin was narrower than the current pin, so it didn't work for me. We just learned not to swing the doors hard, but that won't work with kids and/or guests.

no answer on flipping the swing??

The door should open the other way, so you don't have to step in and fully close the door every time you want to use the sink. If it's a permit issue that the door doesn't fully open that way, put in a pocket door instead.

Why don't you flip the door so it opens outward?

Pocket door, barn door?

as mentioned above, all of my new doors have that hinge pin with cushion

Where oh where is the OP I really hate it when we ask questions that never get answered in this case 2 what is the item at the bottom of the page and why can’t the door swing that way. Also IMO the easy answer would be to make the door swing out also much better in an emergency too.

Hey, OP here. :)

First, I'm new to using Houzz forums, so I didn't realize I was expected to respond to suggestions, other than by thanking people...which I thought I was doing by liking the responses and clicking the little thank-you link. I do, very much, appreciate everyone's ideas and will do better next time.

Second, we're not changing the door -- trying to keep costs down with this small reno. For what it's worth, we considered a pocket door but it will eat up four inches into the room that we can't afford so the door will stay where it is. Barn door won't work either, for similar reasons inside/outside the space.

Again, thank you everyone -- I've got the help I needed!

The use of those hinge door restrictors seems to be more of a thing to use when you have a door like a pantry door that might be in a tight place, is not used as often. Used in a door between two rooms, it seems more like fix for a design flaw.

People here will happily help you to look at the design of this room and see if you can find a different layout so that it will not break building codes and be so awkward. Is there some reason you can't use a pocket door? I can almost guarantee you that someone is going to blast through that door and force the door past the 90 degree mark at some point. Doors do not commonly have this kind of restriction and it is never expected.

If changing the door to have the hinges on the other side or to swing out is not an option you would choose, consider building a box shelf left of the sink from the ceiling down to just below door top level to act as a "stop" for the door. You could add a rubber knob/wall stop to the side of that box shelf.

https://www.google.com/search?q=wall+stop+for+door+knobs&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiGxarPzfTlAhXpYd8KHfiFDzUQ_AUIEigC&biw=1328&bih=617#spf=1574109181628

https://www.wayfair.com/Latitude-Run--Rectangle-2-Piece-Wall-Accent-Shelf-Set-LATT2677-L508-K~LATT2677.html?refid=GX112603344243-LATT2677&device=c&ptid=293492094696&network=g&targetid=pla-293492094696&channel=GooglePLA&ireid=38090015&fdid=1817&gclid=EAIaIQobChMIyImj-c305QIVxZyzCh2Kpg7LEAQYBCABEgKo0fD_BwE

As a bonus, you've added storage space to your bathroom.