My wife and I are expanding our original coop, built at 4'x4'. We are adding on an 8'x4' section to make it a nice long 12'x4'. The original coop is perfect for our original 3 chickens. The problem is, our original 3 are actually 5, plus 4 in a brooder needing somewhere to call home in the next week or so. I am keeping the dimensions kind of basic to cut down on the need for a table saw. The 8x4 allows us to frame for a full sheet of OSB.... plus I am lazy. We will need to remove one wall of the current coop and get the new one assembled in time to lock the chickens in at night after free ranging on Saturday. We want to have it all wrapped up this week end so we can move our 5 week old lavender Orpingtons out of the house. With the summer heat tho, I am finding it hard to work more than 45 minutes at a time. We have two walls framed with OSB board attached and I have built the floor platform (coop is elevated 20" off the ground). All of this was done last evening and this morning before 8:30. I am going back out shortly to cut the windows into the wall. Once the wall is removed, the new platform will be bolted to the original coop and the new walls will be attached with long wood screws. I will hang a long roost before putting the end wall back to close it all in again. Sounds simple enough.... watch me screw it all up.