When I was really little my dad acquired my cousin's old playhouse. It's very small and has one door and two windows. Inside is a small little table perfect for the average four-year-old.
After a certain age that playhouse kind of just sat around and began to rot. The idea for the cathouse didn't come to mind until my dad built something I'd like to call a deluxe doghouse. It has a hallway that leads to a dining hall, and a bedroom with a heated dog bed that only heats up when you put a certain amount of weight on it (50+lbs). Plus we had to make it large enough for our over 100lb dog to fit through the hallways. The entrance leads out into his cage.
After a year or so of having a cat it kind of became troublesome. We love our cats, but we can't have them inside because my mom is more than fairly allergic to them and has to wash her hand every time she comes in contact with one. For a long while, we kept them in the garage but that proved to be not very useful for my dad who uses the space to weld and do other things that can end very dangerously with other animals staying around.
Eventually, we realized that if we somehow changed my playhouse into a cathouse it would benefit everyone involved.
Inside the cathouse is an old square wooden shelf with square cubbies made for fabric pull-out drawers. Instead of fabric pullout drawers are fuzzy memory foam pads for cats to sleep on, and a foot or so in front of that is a floor of pine chips to cuddle in and keep warm in the winter time since sometimes cats like to cuddle and the cubbies are only big enough for one cat each.
In front of that area is the old game table that sits in front of the window. That's how they get in! There's a board diagonally placed like a ramp leading to the window so it's harder for larger animals to break in and hurt them or eat their food.
On the main floor below the table is wood flooring with lot's of food and water dishes held in place by molded plastic mats so the water won't spill onto the wood and ruin it.
Also, I forgot to mention they have a fenced in yard with a special cat gate as a secondary preventative measure to help with larger animals breaking in. Inside their little cat yard are a brick tower, a small tree and lots of grass so they don't have to go too far in the winter time to use the bathroom. This fenced in area also has a roof for two purposes. One purpose is to prevent snow (since I live in Michigan) from taking over their entry into the house, and a second purpose is a little cat getaway. On the roof is a bunch of old pillows, and remember those old trampolines from your childhood that are really small and for one person? I used to store it up there, but it kind of grew into a part of the cat house. They LOVE it. They're up high, and they can hide in a dark space and watch everything around them. Also, since it's dark colored in the middle it attracts heat and makes for one very happy kitty!
This line is me apologizing because all of the pictures I took I realized it's sad and winter out and I should probably clean their caged part tomrrow whoops.