Cat house space needs plenty of sunshine and fresh air, which is safe and easy to get in and out. One or more bedrooms have the same advantages. If humidity is not a problem, so is the basement. Lighting, heating and ventilation equipment can be installed later.
You can build even if you live in an apartment. If there is enough room, put the cat cage in the opposite direction to the human activity area, and cover the back of the cat cage with hard material, like a fake wall. Cover the door to the human activity area with thick curtains.
Think carefully about the space you will spend on the cat nursery in the future and the money you need to build a high-quality cat nursery. In order to ensure the mental health of cats, spacious activity space is very necessary.
Extended data:
If the cat house has a balcony facing the sun, or there are many windows, or it is an outdoor cat house, it is not difficult to provide sufficient light. If the cat house is built in a semi-basement or a room with few windows, it needs artificial lighting.
Light can affect the pituitary gland of cats, which controls cats' long hair or hair removal. Giving your cat enough light can make their living environment closer to the natural environment alternating day and night, so that they can shed/change their hair according to the law of natural temperature change.
In nature, the law of changing hair is that a lot of thick hair is lost in spring and winter, and a little thick hair is lost in early autumn and summer.