I too needed a home for some hatching babies and in a hurry and on a budget. Keep in mind the I live in Phoenix. I am more worried about too hot than too cold. I am not that worried about rain. Also, I am well inside the city and away from washes and have a solid cement block fence. The only predator I have any concerns about are cats and I rarely see those in my yard. Our end result is a good candidate for an "ugly coup" contest, but we are very happy with it.
One pallet on the ground under a large navel orange tree (yes, I am reinforcing cold is not a problem). On pallet on the west virtical side. A large composite board (yes, it will need painted or replaced to stand up under wet conditions) about 12" by 24" was screwed into the north side in the lower corner to hold the west side to the bottom. The same was done on the East side. We stabilized the top with a 2x4, covered the whole thing with bird netting and called it done for phase one . . . protect the broody and her 1/2 day old babies. The next day we put strips of asphalt roofing shingles around the bottom to keep the babies in. (I had these left over from the previous owners roofing project. Oh, I fort that I put more of the composit boards in the bottom of the coup to keep the babies in and then put towels on top so they wouldn't get splay leg. We stufffed rags in any corners that looked like the babies could fall in. We were thrilled, we had a brooder. Later we will add roosts...and as it rains once in awhile ... sometimes with vengence...I'll need a roof. Still pondering that one. For now the roof is bird netting covered by shade cloth with nice shady branches in many layers above. So far I spent $8 for two 2 x 4's. I have toyed with using canvas for the roof...and to wrap the side in for extra cold days....which aren't cold for fully feathered chickens anyway. The third step we did was use a giant crow bar as a lever to lift it up and put bricks under it to keep it out of the flood irrigation. We love it. When the babies are bigger I will remove the floor boards. In my perfect world I'll put hardware cloth down. Also, I'll need to paint the composit board or it will disintegrate - or so I am told.
I am SURE you can come up with something more elegant with even a little planning. If you want something super cute, google pallet and coup (or doghouse) and there are some fun things on line.
Here's a close up. The pallets are on sides opposite eachother.
The board across the front is the door and is held in place by cinder blocks. It has since been removed to allow Momma to take them around the yard now that they are older.
Oh, my original plan was to make an a-frame style...I saw one at the citrus nursery for their chickens.
If you are in cold country....read up on that. There is a section somewhere around here on that....oh and there are some thread titled open coups too. More imporatant is to keep predators in mind...if you have any, security is very, very important.
Looking for (found and inserted) picture of my ugly coup to post ... to inspire you. It won't take much to improve on it!
PS: Please overlook the many spelling grammer, etc errors. I wanted to share with you but am short on time.
PSS Of course, towels are not the best bedding long term, but that was our short term solution.