A little while ago someone gave us a pile of recycled timber. We decided to use some of it to make our cats a tree house. We started with a basic square box. Planks of wood were screwed to thicker posts in the corners We made a door on one side. I wanted them to have a window, but I also wanted the tree house to be as weather proof as possible. I used a plastic picture frame to cover the window and keep the rain out. Next came a roof. Hiro trying it out for size. He fits! Next I filled any knot holes with wood filler and gave the whole thing a couple of coats of outdoor wood stain. After that find a suitable tree and put up some support beams. Once the tree house was up we realised it would be too easy for the cats to jump from the loft onto the fence, so we put up a few thinner pieces of wood to stop them from doing this. The ladder was also made from recycled wood. A cement block at the bottom stops the wood from getting damp and rotting. Then I gave the whole thing another coat of wood stain. Little Boy tests the ladder. He's the heaviest cat we have, so if he can make it up and down it should be easy enough for the rest of them. Carpet tries it out next. We filled the inside of the house with straw so they can nap inside comfortably. And of course, no tree house would be complete without fairy lights. Do you make things for your cats? I'd love to see some pictures.