Our dog houses are simply modified plastic sheds from Home Depot. We needed something quick that would last for a few years until we could build a Kennel. I just built them on a raised wood floor, added a window, and solar heating panels. They seem to work quite well. The dogs are happy to be in there. Seems to be better than getting locked in wire crates while we are at work. I hate doing that. I can't go 10 hours without peeing!
If fast is needed, they work.
If fast is needed, they work.