A used shed would be less than half and then you'd have enough money left over to build a run.
That coop should not be used to house more than 10-12 birds. You have 18. You have a problem.
Not unless they are incompletely feathered chicks it doesn't.
I'm in NY. We have lows in the -20s. I do not heat the coop. None of my birds were harmed.
Oh no. Not a pre-fab.
Your chickens need a DRY, WELL VENTILATED coop providing 4 sq ft of floor space per bird (this does not include nest...