All these houses typically fall into these kinds:
1. Scratching house
2. Cott house
3. Playing complex
4. Classical house
Functionality of the scratching house is possible to define, while reading the title itself. This house is created for the cats that like sharpen their claws against the furniture or interior objects. If you have not bought a separate scratcher yet, this combined option will become an ideal solution both your cat and nerves.
A cott will become a perfect place to relax for female and male cats with low temper. We also recommend you to look more attentively at this kind of house if the pet is about to bring you kittens.