I agree that bigger is always better in sizing the coop! You will have snow, and predators, and times when your flock will be inside for perhaps weeks at a time. Ten feet of roost is too little for twelve big birds! How will they have space to fly up there? Two roosts that long would be better!
How about an 8x12' coop space? much more comfortable and easier to manage and build.
Have you looked at the Woods coop? I'd love to have one! Second best is a large walk-in shed type, which I have, with additions. Having a roofed run is great to, so avoiding all that snow shoveling.
'Chicken math' has already struck, so plan for as large a coop as you can, in case it strikes again.
Mary
How about an 8x12' coop space? much more comfortable and easier to manage and build.
Have you looked at the Woods coop? I'd love to have one! Second best is a large walk-in shed type, which I have, with additions. Having a roofed run is great to, so avoiding all that snow shoveling.
'Chicken math' has already struck, so plan for as large a coop as you can, in case it strikes again.
Mary