All of our nesting boxes are 12" x 12" X 14". We have six nesting boxes but out of our 20 or so laying age chickens they really only use two of the boxes anyway. The 14" is the height which works well with larger standard breeds while getting into and out of the boxes. Providing more head room never hurts. We also provide a community nest box which three of our Cochin bantams use. We have a few chickens (game birds) who never use the boxes and prefer to build their own nests on hay bales which are located in the barn loft. .
One of our black silkies dug her nest in a hay bale and has decided to become broody. She's on week two!

