My Homemade Pet Rat Cage - Custom Large Cage That is Easy to Build

Line up the bottom edge of the door with the bottom of the door opening. The "flat" side of the door (opposite the side where the support bars sit) should face in, allowing the door to sit nice and flat against the cage so there are no spaces. Using several cable ties, attach the bottom wire of the door to the lower edge of the opening. I also added a couple of metal clips in case my boys decided to try chewing off the zip ties.

The doors are latched with simple bolt snaps (like the clips often found at the end of dog leashes) which can usually be found at hardware stores. The bolt snap is shown in the inset in the picture above.