This includes Bed Wetting along with urinating on the floor, wall, couch, etc.
If your child does this while asleep: (1) Install a motion detector to turn on a bright light and chime. This can be purchased at any local "Home Improvement Center" for under $50. Then when they get up to go, the light goes on with a chime (you can put a second chime in your room if needed).
(2) Try an item like the one listed at this website - Go To Sleep Walking Alarm. It is for sleep walkers, but it might work for your child. You will have to send them an email for more info.
(3) Replace carpeting (with linoleum and calk all edges) in the rooms that are being used to urinate in. After that put down newspapers. This will help absorb the wetness and also let you and the child know it is wet. It will help in the clean up also. Keep on hand a bucket, mop (the type that has a squeezer), and plastic trash bag.
If your child does this while awake:
If your child continues "Urinating in Places Other than the Toilet" then hire a babysitter, or a person to watch this child during the day. They need 100% supervision. After a period of time they may decide to stop. If not just continue to supervise them well. If you have rooms that would be hard to clean, then make those rooms off limits to this child. If they urinate on the furniture, then look into getting vinyl covers. The idea is to either stop it with supervision or contain it, to make it a smaller problem.