Is my Coop big enough for 6 chickens?

[Sneebsey]

That's reasonable. What I'd suggest is to remove the mesh and clad the run part of your coop with wood, which shouldn't be too difficult since the frame is already there. Add some extra roosts, and ideally raise it up off the ground slightly with blocks or timber to deter pests from trying to chew their way in. Then you've essentially doubled your space.

 

[wyoDreamer]

Also - for the not so math aligned: 4 square feet is an area 1 foot wide by 4 feet long. To visualize it, I imagine a 12" floor tile - which is 1 foot long and 1 foot wide (hence the name 1 square foot). Lay 4 of them side by side to get 4 square feet.

My boot measures 11 inches long so it is pretty easy to guess about any measurement in the field. lol! redneck math at its best...

 

[Sara Ranch]

I agree with what most have said.

What you have will work for the four birds you have currently, but it will be a tight squeeze on the roosts when they are full grown. I doubt that six full grown birds will like you, or each other, very much if they are squeezed in there.

Do you remove the food station at night? That would help them feel like there is more room.

If you can and are willing, give them more run around space outside. That will help too.

 

[wyoDreamer]

With a closer look at the additional pictures you posted, I think you would be in good shape doing what @Sneebsey suggested, removing the wire and covering the entire thing in wood for a coop. A determined coon can rip through chicken wire and get at your chickens. If you have the means, maybe make part of the wall out of something clear. Maybe incorporate an old window or a piece of polycarbonate. That would make the coop brighter in-case the weather is terrible and they choose to stay inside.
Does that coop have a floor?
I think I am going to whip up something like that this weekend. I need a place for my meat birds to go in a couple of weeks and since there are only 4 of them, that would be about perfect.