That looks great! I am in Canada and it gets darn miserable here, I insulated the hen house which is a 4x10 room in the barn Which is only used for roosting and sleeping. I don’t supplement with heat as my dozen keep it around freezing or just above even on the coldest nightsHello!
I previously posted on the New Member Introductions, I was told the coop I had for our 4 chicken was too small, especially when winter creeps in and they'll most likely spend time inside! I had a tractor supply chicken coop, one of those that says it's for 6 chickens when it's clearly for about...2.
Pervious post! https://www.backyardchickens.com/threads/hello-excited-to-learn.1540029/
We have a flock of 4 chickens! Maple who is our Ameraucana, Aspen our Silver Wyandotte, Magnolia our Light Brahma and Hazel our Rhode Island Red!
I think the coop we built is a little big for a flock of 4, but just in case in future we decide to get another 2 or 3 we thought we'd go big!
We have two big windows, you can see one in the photo, the other is on the left side, Run isn't that big because they have the run of the garden during the day, we only added a run just incase they need to be locked up, for example we'll be having house renovations happening soon, garden fence being changed and the residing of our house etc so we will need to lock them up when that is happening.
Inside the coop we have 6 nesting boxes, 2 areas to roost from and we have a heat lamp we just put in because Idaho is planning to have a very cold winter, I will also put extra bedding in when that weather creeps in! If you have any tips to help with the cold please let me know! ♥ I don't want my girls getting cold!
Hope I did a good upgrade!Please let me know any feedback! We had a lot of help in knowing what to do from my husbands mother, she's had a coop and 10-15 chickens for about 17 years!
Edit: Thought I would add that it does have a door.I forgot the outside photos were taken when we hadn't finished it!
I only put in supplement heat using a cosy hen panel for my broody silkies. It was darn cold around -20 to -30c. During the day they have the run of the horse barn with most of horse poop to dig in and hay to climb on

One suggestion is that you might want to have a couple of covered nest boxes, my gals o lay use the covered secluded boxes even though I have 11 hens