What a great feng shui question about mirrors to start the day: “I was wondering if it would be a bad idea to hang a full length mirror on the outside of a bedroom door facing the hallway. I’d pretty much see the mirror if I was walking down the hall and towards the bedroom. I also wondered if it would be a bad idea to put it on the wall in the hallway directly opposite of a bedroom door. Which would mean I would see the mirror down the hall if I were to walk out of my bedroom.”
This is my answer:
When you put a mirror on the back of a door, you sorta send the energy away from the room behind it. This is the reason why its a good idea to put a mirror on the back of a bathroom door, especially if its facing your entrance way, etc, as it kinda throws energy away from the room behind the mirror, masking it in a sense.
Am I being too complicated?
The simple answer is that unless there is a functional reason for a mirror on the back of your bedroom door, I would generally avoid it (your bedroom should feel like its a part of your home).
Now, for the “down the hallway” mirror. This is way trickier, as you are creating a very dynamic and maybe positive/maybe not effect by placing a mirror at the end of a hallway. Think of it this way- a mirror expands the hallway, it pulls people down the hallway faster, and it creates more “self-awareness” in a sometimes positive and sometimes non-positive way.
Can you tell that this is a tricky question to say yes or no to?!
My advice if you realllllly want the mirror at the end of the hallway is to safely prop it up and try it out for a few days. How does it feel? How does your life feel? You will know pretty quickly if it is affecting you in a non-cool way 
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Very helpful! Thank you!
I have mirrored doors on a closet in my hall , east and also a mirrored wall on the west in my hall it doesn’t feel right . its a long hall with office and bedroom on the west and south is master bedroom with the bathroom on the east . help ! what would help this space be happy ? thank you lena .
You might want to try covering one of the mirrors if they face each other… Contact paper is a removeable solution that can look as cool as wallpaper!
thank you ! are they bad feng shui in a hall ?
A little different situation but wanted to mention it somewhere. We live in an old house with a basement entrance on a busy landing between two levels. This basement entrance is a just a dark gloomy “hole” and hard to fix. So, after reading your great ideas, I tried putting mirrors up.. but no, that wasn’t any good. But suddenly, after reading your artwork articles on here, I grabbed my two ( purchased at a thrift store ) 12″ x 12″ needlepoints of a pretty soft green cabbage with white background and a soft green head of broccoli with white background and hung them on the wood over the gloomy hole and VOILA ! eye distraction and now I see those pretty needlepoints and the hole, well, it disappears if that makes sense. So THANK YOU Dana…
awesome!!!!!!!!!!!!!!