Is it weeing or spraying?
This was on Google for weeing
Here are some useful tips for stopping your cat urinating inside:
1/ Make sure your cat doesn’t have an underlying medical condition
2/ Place litter boxes in areas where your can often sprays, to remind them that the litter box is available.
3/ Place food, or something with a lemon scent where the cat sprays. This will discourage the cat from spraying in this area.
4/ To stop your cat from spraying in sinks and bathtubs, place some water in the bottom of them.
5/ Leave your cat in the laundry or bathroom with a litter box, food and water.
6/ If you think something that the cat can see outside is causing the cat stress, block visual access to these areas by closing curtains etc.
7/ Use positive reinforcement when the cat urinates in the litter box.
As for spraying its normally a natural territorial thing, stress related or they feel threatened by another scent, are you quite musky?