You can do a second floor if you want -- remember you will still need to be able to get in there and easily reach all parts of the coop! -- but the chickens will not use it equivalently to actual floorspace. I would say it helps "some, maybe" but certainly not anything like counting as having that much larger a coop.
If I can't alter the coop , does a covered run help?
For sure. ("Somewhat", but enough to for sure be worthwhile). Roofed (properly, to withstand snow and wind load -- you are basically building another BUILDING, just with mesh rather than solid walls) and with something to block the wind on the upwind side(s), the chickens will be much more willing to spend time outdoors than if you had an open and exposed run. It is still not the same as having more indoor space, nothing is, but it sure *helps*.
In terms of your 12x12 coop, you may be able to do an addition off one end or side -- it is ok if there is a wall with open doorway separating the two halves -- IF you can make it continuous, attached construction. This is easy if it is pole-built, but harder if it is stud-framed and up on blocks.
Good luck, have fun,
Pat
For sure. ("Somewhat", but enough to for sure be worthwhile). Roofed (properly, to withstand snow and wind load -- you are basically building another BUILDING, just with mesh rather than solid walls) and with something to block the wind on the upwind side(s), the chickens will be much more willing to spend time outdoors than if you had an open and exposed run. It is still not the same as having more indoor space, nothing is, but it sure *helps*.
In terms of your 12x12 coop, you may be able to do an addition off one end or side -- it is ok if there is a wall with open doorway separating the two halves -- IF you can make it continuous, attached construction. This is easy if it is pole-built, but harder if it is stud-framed and up on blocks.
Good luck, have fun,
Pat