General rule of thumb is 10 sq ft per bird run space and 4 sq. ft per bird coop space. This of course depends on many factors and is not carved in stone.

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General guide is 4 sf in the coop and 10 sf in the run. I can easily hear mine from this room, but i'd not venture a guess of a good set back. Right now, they are silent.Like how big do you think a pen should be, per chicken, to keep them happy, and...say you had someone at home who needed quiet, how far away would you want the coop to be from your house so that you weren't hearing the birds early in the morning or through a good chunk of the day?
I can see that line of thought, but I doubt the 3-6 of a typical suburban flock would be near as loud as my 23. Just putting that out there for consideration.My chickens are noisy when they start laying in the morning up until about 2 everyday. If you're a day sleeper and work nights you probably shouldn't agree to them having chickens
I second that, the lot is just too small to avoid the noise of any type of chickens.I would just say 'no' to the neighbors. It seems like there just isn't enough space for chickens where you live. I've worked night jobs and graveyard jobs in the past, and I know how difficult it can be in those circumstances to get enough sleep. It can be very, very frustrating. Since you have the power to prevent a problem before it happens, you should use it. The neighbors can move to a house with a bigger yard if chickens are that important to them.
Salmon Faverolles are the MOST CHILL chickens. Very quiet, are not opinionated or bossy.
10 sq ft per bird in a pen, at minimum (though that could be too tight for some birds and cause bickering or fighting, which gets noisy).Like how big do you think a pen should be, per chicken, to keep them happy, and...say you had someone at home who needed quiet, how far away would you want the coop to be from your house so that you weren't hearing the birds early in the morning or through a good chunk of the day?