I live in a shared house with a few other people. Due to my schedule, I'm up when most of them have gone to bed. I often need to eat something after coming home but have received complaints that the noise I make in the kitchen wakes them up.
I think the loudest noise is from pressing buttons on appliances. For example, when you press the buttons on the microwave to set the time (I make sure to stop it before the time is up so it doesn't beep at the end). I also use a George Foreman Grill that beeps when you adjust the temperature. Also, the fridge door is sticky and makes a noise when opening it. Any ideas on how to keep these things quiet? Other than that, I'm very careful to put things down on a surface quietly. Normally I wouldn't make anything new and heat up leftovers or boil eggs.
Another problem is, I have the master bedroom so I use the bathroom in my bedroom. This creates a problem because my bedroom is at the end of the hall with all the other bedrooms, so if I need to wash my hands or something I walk past all the other bathrooms. Also the simple act of unlocking/opening my door seems to make noise.
EDIT: The noisiest part is opening the fridge door. I forgot to say this.