How to Keep a Cat Out of a Room?

1. The door is the key
   While that may sound contradicting, using the door to the room or area you do not want your cat to be in is the first thing you would probably. Simply always have the door shut and voila! Your cat cannot enter the area or room. If in any case, you will have to enter the room, you will have to open and close it fast or else your cat will beat you to it. 
2. Look for alternatives
   If the area or room does not have a door, then you will have to turn to other structures that will keep the cats out. See to it that it will not be easy for your cat to get over it, because that forfeits the purpose.
3. Your rules  
   You define what your cat can or cannot do. You will firmly set when your cat can or cannot freely roam around inside the house or outside the house.
4. Do not give in
   Sometimes we can’t help but cave into our cat’s antics. Try ignoring your cat whenever it scratches on the door, most especially if you are inside the room. If your cat does not get any reaction from it, your feline will eventually get bored and walk away

What to do:

• Just be patient with your cat – If this is a sudden change in your house routine, then you will have to give your cat some adjustment period. Your cat will soon get used to it. Especially if your cat is the type that follows you around everywhere.
• Consistency is key! – Just do the same thing over and over again with the same results. This will only confuse your cat and you will fail to achieve the desired results. Just be consistent with what you want to do in order to send the message across to your cat. You will have to be clear when it comes to establishing that your feline cannot enter a certain area or room. Soon it will become a routine for your cat.
• Make sure that your cat knows its name – A cat who knows its name, or at least responds to a certain sound, is going to be helpful when you want to make it clear to your cat that being in a particular area is not okay. When you see your cat entering the said area or room, try calling your cat from the opposite direction every time. There is importance in teaching a cat its name.
• Treats! – Once your cat follows suit to your command, you could give it an occasional treat to signal that your cat did something right. Soon your cat will no longer enter a room in order to get a treat from you.

What not to do:  

• Never hit your cat – Like what was said in the previous paragraphs, patience is a virtue. It could take time before your cat could get used to what you want it to do. Never hurt a poor defenceless cat.
• Do not opt for methods that will stress your cat out – Avoid approaches that will make your cat distressed in the process.