Introduce your cat to the flap before it's put in place so that they be familiar with the size and shape. The flap should be opened and let them explore it from all angles.
Make sure the cutout is square and even. Mark the screw holes and align them with your cat flap opening. The distance between the edges must be equal.
Preparation

Installing a cat-proof flap in your home is beneficial for the well-being and health of your pet. It will allow your pet to freely move from inside to the outside, without needing to allow them in or out. It also stops them from fighting over litter boxes, cat food, or the door of the home.
Make sure you have the space in which you'll install your cat flap before you begin. It will be easier to work with if you eliminate any obstructions. Also, you should take away any furniture or decorations that might hinder your installation.
When you are preparing the space, you will need to take measurements and mark the location where you are planning to install the cat flap. This will prevent you from making a mistake that could damage your door or wall. You will want to put the cat flap in a spot that is accessible for your pets, but doesn't harm the structural integrity of your home.
The cat flap can be placed in a door that leads to a closed space such as your closet or laundry room. This will stop your cat from tripping over it and will keep your cats away from potential dangers. The flap for cats should be low enough for your smallest cat to access, as taller cats may struggle to leap through a flap that is higher.
It could be a good option to employ an experienced handyman if you have sliding doors or sash window that is old-fashioned. It can be a challenge to install the cat flap on these windows and doors, and mistakes can cause costly damage. A professional can install the cat flap without causing damage to the structure of the window or door's integrity.
To determine the space for the cat flap, you'll need a ruler or a tape measure to determine the height of your cat's belly from the floor. This will allow you to accurately cut out the opening for the cat flap. Once you've marked the line, use a spirit level to ensure it is completely horizontal. Check the instructions included with your cat flap kit for the template drawing. Attach it to your door in a way that the bottom edge of the template aligns with the horizontal line you've drawn and is centered on the centre of the door.
Measurement
A cat flap sometimes known as pet doors is a small opening at the bottom of your exterior doors or windows that allow a pet to leave and enter the home. You can pick from a variety sizes and materials to find the right one for your pet.
Before you purchase an animal flap, you need to accurately measure the dimensions of your window or door in which you plan to install it. This way you will be able to ensure that the hole to be the right size and that the cat flap will fit. An effective method is to block off a portion of the door and then try to walk through it with your pet. This will give you an exact picture of the opening size (width).
It's also advisable to measure the height of your cat from the ground to the lowest part of their stomach. cat flap insulation will ensure that the flap is set at a height your cats are comfortable using. If it's too low, they may struggle to get through. If it's too high, they might not be in a position to use the flap.
In general, you should drill your holes at 45 degrees to the vertical surface. This will ensure the most stable and secure installation of your cat flap. If the cat flap kit you purchased didn't come with a spirit level, a straight edge can be used in place.
It's best to employ an experienced glazier install the cat flap on an UPVC or glass door or window. These doors are usually toughened and drilling could weaken their integrity and lead to them shattering. This could create an security risk to your home.
Placing a cat flap in a brick wall can be problematic, too, because if you drill into a soft area of the wall, this could cause problems with pipes and cables that run through the property. This could lead to costly repairs, or even leaks or weather damage that comes from outside.
Marking
Mark the hole you'll need it after measuring your cat's measurements. Mark the centre of the flap using your spirit level. If the template for your cat flap kit doesn't include the centre line, copy it and trace around it using pencil to mark the spot where the hole will need to be cut.
Be aware that if the cat flap is too low, it can be difficult for your cat to climb in and out of your house, and if the flap is too high, they could struggle to see what is happening outside. To ensure that your cat is secure and safe it is recommended to put the flap as close as you can to their stomach.
It is also important to be cautious not to place the cat flap too close to the frame of a wall that is solid as it could cause issues with damp, draughts, and stability. It's a good idea to seek help from a professional in case you're not familiar with masonry.
Then, prop open the door and show your cat or kitten where to go. (It is helpful if someone is on the inside encouraging them). Once they've made their way through the door, you can slowly start to allow them to enter and exit at will.
It is not advisable to push your cat or kitten through the flap at a high speed as this could cause them to become scared. They could be injured by the clunk or snap when it closes, and they could be scared if their tail gets stuck in the flap as they try to exit. Cats also have a habit of returning home to check for intrusions, so having the door open can also be a concern as it can lead to your pet being attacked by another cat they are familiar with. Installing a small cat door is recommended if your kitten or cat is able to use it.
Installation
Once the cat flap is installed It is essential to teach your cat to use it. This will take time but with patience and a few treats to entice them, they will eventually get grasp of it. Install a lock to the cat flap if you want extra security, especially in the event of bad weather or you're away from home.
Choose the location where you'd like to place the cat flap on your door. It will need to be put in a spot that opens into an area that is protected from the elements of your garden. This will make your cat feel more secure as they move into and out of the house, and can help prevent other animals from accessing your home.
You should also be aware of the height of your cat flap. This should be in the same space as the measurement of your cat's belly so that they can get through easily. You can also place steps on either side of the entrance to assist your cat pass through.
Once you've determined where you'd like to place the cat flap You can measure the door using a pencil and mark the location. This will help you determine the best place to cut. Then, you'll need to cut a square on the door with the aid of a Jigsaw. Wear safety glasses and a dust mask to keep your health safe from inhaling dust. After cutting the square into pieces, it is essential to sand the edges of the door to create smooth edges.
When you are done the sanding process, you can replace the cat flap. The flap should be installed so that the lock, if there's one, is on the inside of your door. If there are screws for the cat flap on the door, you must now drill them into the hole. Then carefully insert the cat flap in the hole. Make sure it fits perfectly.