This indoor/outdoor rabbit hutch takes advantage of the warmth of the garage in the fall and winter and the cool breezes in Spring and Summer. I cut out some panels on the outside of the garage as well as the plywood underneath so they could move freely between the sides. There is a large piece of asphalt shingling over the cages so they are protected from the elements.
Step 1: Build the cage's under-structure on both sides of the garage wall
The five-bay cage was purchased used from a mink farmer. It would be easy to make a similar cage out of the raw materials, but I was glad that I didn't have to. The structure that holds up the cage was built like a deck with the joists spaced about a foot apart. I used reclaimed cedar wood from an old project so that it would hold up to the elements.
Step 2: More detail about the outside portion of their cage
The outdoor portion of the hutch (visible at the back of the photo) is suspended a couple of feet above the ground to allow the droppings and urine to pass through underneath. I have actually sold about 40 gallons of rabbit droppings so far (at $5/5-gallon pail) to use as compost/fertilizer. The side of the hutch facing the garage has been removed. There is a flip-up portion of the cage on each bay that allows me to reach the rabbit and change their water.
Additionally, there is a rabbit run (at the front of the photo) that is completely enclosed by fencing around the sides and rabbit wire on top. There is a dog next door, and I didn't want him jumping in to grab one of the rabbits. There is a small plastic box in this area to allow the rabbit a place to hide. At some point, I would like to build a wire-enclosed ramp at the front of each cage to allow each rabbit the ability to access the run without having to catch them and physically move them to that area (the current method has a high risk of escape).