The pallet boards are basically 1x4's (which is 3/4inches x 3 1/2 inches to be exact). As far as length, I got lucky and had a supply of pallet boards that were 6 and 7 feet long (longer than the standard pallet size). My coop is 6x4 so I was fortunate to have long pallet boards that fit the 6ft length, however, if I had increased the dimensions of the coop to like 6x8 or 4 x8, I would have just butt-jointed the boards to increase the length. Another lumber source (some people find dismantling pallets too tough, and I have to admit it was tedious) would be finding reclaimed 1x4's or even fence boards. Either would work for this construction style.