It's 51/2 feet x 8 feet .... I thought it was too many hens here too ..... you think the are red sex links ?! I wasnt convinced they were RIR either .....
I would buy some fencing and give them a bigger area to run around in during the day. You are in the Pac NW like me,so the actual coop might be plenty of room for sleeping and laying...can't really tell from the pic. You only need a couple of nest boxes, and a place for them to huddle at night.
During our rare cold days when they want to stay out of snow, you can cover the underside of the coop with tarps to give them a windbreak (I recommend this anyway if they are always in the cold wind as they love a windbreak in the winter).
If you do make a run you might consider hawk attack possibilities...you can put up fruit tree bird netting but the snow will bring it down. I use it during the spring, summer, and fall for young birds. They do sell heavy knotted type netting with snow load ratings on internet if you need that sort of thing.
Yes they look like Golden Sex Link type chickens. Good layers!