How to Install a Cat Flap
Introduce your cat to the flap prior to installation to allow them to become familiar with the dimensions and shape. Prop the flap open and let them explore it from all angles.
Ensure the cut-out is even and square. Mark the screw holes and align them with the cat flap opening. The distance between the edges should be the same.
Preparation
Installing a cat flap inside your home can be beneficial to the health and well-being of your pet. This is because it lets them to move freely between indoors and out without having to allow them to enter or exit. It can also prevent them from fighting over litter boxes, cat food, or the door of the house.
Set up the area where you'll be installing your cat flap before you begin. This is because removing obstacles from the area will make it easier for you to work. You will also want to take out any furniture or decorations that could hinder your work.

When preparing the area you must determine the exact location and measurement you intend to put the cat flap. This will prevent you from making a mistake that could damage your wall or door. You should put the cat flap in a location that is accessible to your cats, but won't compromise your home's structural integrity.
The cat flap can be put on the doorway leading to a locked space, like your laundry room or closet. This will stop your cat from jumping over it and allows you to keep your cats from any potential dangers. The flap should be low enough for your smallest cat to access, as larger cats may have difficulty to leap through the flap.
It could be a good option to employ an experienced handyman when you have sliding doors or a sash window that is old-fashioned. It isn't easy to install a cat flap on these doors and windows and any mistakes could cause costly damage. A professional will be able to install the cat flap with care and without harming the structural strength of the door or window.
You'll need to measure the height of your cat's belly from the ground in order to mark the area for the flap. This will allow you to precisely cut the opening for the flap. Use a spirit level once you've drawn the line to make sure it's horizontal. Next, check the instructions included in your cat flap kit to find the template drawing. Attach it to the door in a way that the bottom edge of the template is in line with the horizontal line you've drawn and is aligned with the centre of the door.
Measurement
A cat flap, also known as a dog's door, is a small opening located at the bottom of external doors or windows. It allows pets to get in and out of the house. They are available in various sizes and materials so that you can choose the best one for your home and pets.
It's important that you take measurements of your windows or doors before you buy the new cat flap. You can then be sure that the cat flap will fit and that the hole is the right size. You can use this technique to determine the width of the opening by blocking off a section of it and walking through it with your pet.
It's also recommended to determine the height of your cat from the ground to the lowest point of their belly. This will ensure the flap is set at a height where your cats are comfortable. If it is too low, they could struggle to pass through. If it's too high, they may not be capable of using the flap.
In general, you should strive to drill your holes at a 45-degree angle to the vertical surface. This will give the most secure and stable fixings for your cat flap install. If your cat flap kit did not include a spirit level, a straight edge can be used instead.
It is recommended to hire an experienced glazier install the cat flap on an UPVC or glass door or window. These doors are usually toughened, and drilling can weaken their integrity and result in them breaking. This could be the risk of security for your home.
Placing a cat flap in the brick wall could be problematic, too, because if you drill into a soft area of the wall, this could cause problems with pipes and cables that go through the property. This can lead expensive repairs or leaks, or even weather damage from outside.
Marking
After you've measured your cat or kitten to find the right size flap for them, it's time to mark the location where the hole will be. Mark the center of the flap using a spirit level. If the template for the cat flap kit doesn't include the centreline, you can photocopy it. Then use the pencil to trace around the template to mark the location where the hole will be cut.
Be aware that if the cat flap is too low, it could make it difficult for your cat to climb into and out of the house, and if the flap is too high, they might struggle to see what is going on outside. To ensure that your cat is at ease and secure it is recommended to place the flap as close as you can to their stomach.
It is important to keep a cat flap from being too close to a wall frame. This can cause problems with damp and draughts. If cat flap fitters working with masonry it may be worth seeking professional help.
Then you need to prop the door open and show your cat or kitten where to go. (It helps if someone is inside, helping them). Once they've made it through you can let them in and out as you please.
It's important that you don't allow your kitten or cat to go through the flap too fast as this could lead to them becoming scared. They can easily become injured by the clunk or snap when the flap closes, and even more terrified if their tail gets caught in it as they try to exit. Cats also return home to check for intruders, and leaving the door open can be risky. Your pet may be attacked by a cat they know. Installing a cat door that is small is recommended for your cat or kitten if it is able to use it.
Installation
Once the cat flap is installed It is crucial to teach your cat how to use it. It will take some time, but with patience and some treats to encourage them, they will eventually get the hang of it. You may also want to put a lock in the flap for extra security, especially during adverse weather conditions or when away from the house.
Decide where you want to place the cat flap on your door. This will need to be located in a place that opens out into an area that is sheltered from the garden. This will make your cat feel more secure when they move into and out of the home, and will also help prevent other animals from accessing your home.
It is also important to take into consideration the height of the flap for your cat. This should be in line with the measurement of your cat's stomach to ensure that they are able to pass through. You can also consider placing steps either side of the door to assist your cat get through it with ease.
Once you've decided on where you'd like to put the cat flap then you can measure the door with an eraser and mark the location. This will give you a guide for where to cut. Then, you'll need to cut a square on the door with an Jigsaw. Wear safety goggles and a dust mask, to protect your health from dust inhalation. After the square is cut then sand the edges the door. This will create a smooth edge.
After you've finished sanding, you can now replace the cat flap on your door. The flap must be installed so that the lock, if it has one, is located on the side of your door. Make the screw holes, in the event that there are any on the door. Then, carefully insert the cat flap in the hole. Make sure that it fits snugly.