It depends. Why mix? Is there a "systematic" way you would mix them?

Thanks and yes, he planned to put square back plates on bedroom doors

Yes, I think I would like it. It tells the person in the hall way that these rooms are special, and those doors are utilitarian, like a hall closet, or bathroom.

I agree with the approach if the round ones go on closets and bathrooms and the square ones go on room doors, something like that.

I have been in some old houses that had brass on the room doors and glass on the closets and bathrooms.

Mine are all satin nickel. I have levers on the bedrooms, and knobs, on the closets.

We know doors! Customers choose different doors in the same house or even in the same room so if you want to mix the handles you certainly can!

Yes, go ahead and mix knobs in a house. Every area of the house doesn't need to be the same.

I like for door hardware to be quietly elegant and be as unobtrusive as possible. I want people who visit my home to focus on other elements of the room. If a guest (or a potential buyer in a few years) has to try to figure out why the knobs are different, then I would consider them a distraction. I know there's a trend now to mix everything, including metals. We just bought a house recently and changed every knob, faucet, pull and light fixture in the house to satin nickel, because the previous owners' mix of shapes and colors looked more haphazard and unplanned than trendy.