PhilErvin and Hampton06...both of your places look wonderful! That being said - Back to Hampton's request:
We "chopped down" our children's tree house and converted it into a coop.
I would consider sectioning off your house/coop. The existing counter and cabinents would be a great place to store grit, oyster shell, even feed if in a secure container. You can make your interior "walls" using 2x4 framing and the walls made of chicken wire. You can use this inside as it is not a predator barrier, just a chicken barrier! Three banties would not "need" more than 15 square feet...more is always great tho. By sectioning off the interior, you can have rooms for your banties, and standards you plan may decide to get, a brooder area....you know you'll get addicted like the rest of us
I would suggest looking at some of the interiors posted here...search for nesting boxes, perches, etc. Personally, I have my nesting boxes in rows of two, two high (four total) inside my coop. This allows me to check on my chickens etc while I collect eggs. The lowest box is about 14" (maybe as high as 18") off the ground. The droppings board is about 3' high, with two roosts above it.
We made our run permanent, but if you have HOA issues, you may want to make a tractor that you can move around, so it would not be considered an permanent improvement on you property.
Those are just a couple of suggestions..do some perusing on the coop section though. There are some great ideas here!
edit: Just realized how bare the run looks! We reclaimed some of the woods, which was loaded with poison ivy. Since both DH and DS are highly allergic to it (luckily, I'm not!) I cleared it first before they moved the coop to it's present location and installed the run. I would have loved to have it on the grass!
https://www.backyardchickens.com/web/viewblog.php?id=167-Minnesota_Coop
The minnesota coop has great partition ideas!