Feather picking is a nasty habit. The picked birds will get their feathers back if the picking stops, but if they were picked badly enough the feathers may not come back until after a molt. You said they've been locked up in just their house and run- do the birds have enough room? Feather picking can be a stress reaction to crowded conditions, or it can be done out of boredom, or it can be a sign of a protein deficiency. It starts, but then it rapidly becomes a habit that is tough to break. You need to break it ASAP. There are a couple products on the market that work for feather picking. Hot-pick/No-Pick and pine tar are topical applications, and then the Pinless Peepers are a little tool applied to a chicken's face. Alleviating boredom can be done with some chicken toys. Tossing a head of cabbage into your run or better yet hanging a head of cabbage up in the run will lead to hours of amusement for your birds. There are feed blocks available at the feed store which also help. The feed blocks are comprised mostly of seeds so they are a good source of protein.
Hope this helps. Good luck.
