Fitting a Cat Flap in a UPVC Door

Fitting a Cat Flap in a UPVC Door

The freedom to let your cat move around the house whenever it wants is a great way to keep your pet active and mentally engaged. A flap can aid in reducing toileting incidents by making it easier for cats to leave the house if needed.

Measure the Door

A cat flap lets your pet to go and come as they please without opening the door for them. This is a great way to keep your pet in the house when you're away or at home. It also helps to keep unwanted pests from getting into your.

It is essential to examine the door's measurements to ensure that you get the correct size cat flap. There are a variety of sizes available. This ensures you get the correct size that fits into your upvc door, otherwise, it could be too small or large, and your cat may struggle to use it.

Before you take any action however, you should take a ruler and take measurements of the length of the door in a variety of locations along its edge. Also, you should determine the door's height in a few places. A door that is too high will cause your cat to do an exercise routine every time it uses the flap.

If you're not sure how to measure the door, it could be best to seek help from a glazier or someone who performs this type of work often. They will be able determine whether your door is suitable for cat flaps and can give you advice on the right size flap to buy.

Once you've got your measurements, the next thing to do is to mark the shape of the hole on the door. This will help you when cutting the hole, and will save you money!

You must also ensure that the hole you're creating is in the right place. If you're installing an apex flap to an outdoor door, it's vital that the hole doesn't be too close to hinges. This could lead to leakage or problems with the seal.

It is best to delegate the task of installing a cat flap on a glass door to an experienced glazier. It may be difficult to install a cat-flap within an existing pane. You might also discover that it breaks and loses its weatherproof seal.

Measure the Cat

A cat flap allows your pet to go and come whenever they want without having to leave them alone. It can also stop draughts entering your home, which isn't beneficial for your cat as well as you.

If you do have a uPVC or composite door, it could be a challenge to put in the cat flap. These types of doors are typically made with different materials than traditional wooden or uPVC doors, and the installation process is different, too. Before you think about installing a cat flap in your uPVC or composite door, make sure that it is compatible and that you have consulted the manufacturer because alterations could affect any warranties.

They are designed to be tough and durable and have insulation. They are more resistant to weather than other kinds of doors, however it isn't always easy to install an animal flap. Get advice from a professional before installing a cat flap on a uPVC door or composite.

To ensure that your cat can access the door, you'll need to determine their height. It is easiest to measure their height when they're at peace or asleep, which means they aren't moving around. Once you have their height, you can measure the distance from their stomach to the floor to determine the location of the flap's bottom. Then, you can mark this spot on the door.

If  cat flap fitters  or uPVC door is made from metal (either steel or aluminium) it is important be extra cautious when cutting it with power tools. The act of drilling into metal can cause it to crack, especially when the area is made of toughened glass. This is the reason it's recommended to engage a glazier when installing your cat flap in a pane of glass. This will prevent the glass from breaking and becoming brittle. A Glazier will also be in a position to provide you with a cat flap hole that is less likely to break and is safer for your cat to use.

Cut the Hole

If it does not however, you can make one yourself by using a piece of paper that is thin (tracing paper is the best choice). If it doesn't, you can create one by using an uncoated sheet of paper (tracing paper is ideal). Once the shape has been penciled in on the door, use your spirit level and make sure it's horizontal. This will ensure that your cat flap is positioned correctly in the opening, and it will not slide open or close.

Then, use your jigsaw to cut out the design that is on the door. Make use of a blade specifically designed for uPVC doors. It is usually identified with this information. If not you can ask the staff at your DIY store for assistance. Once you have the hole drilled then place the flap against it and push it open to ensure that the flap's movement is smooth. If it binds at any point, you can use a file or a sandpaper to correct this.

It is also important to ensure whether there are any electric gas or cable lines within the door you'll be cutting through, since they could be damaged by your Jigsaw. You should also be aware of any handles, or other fixtures on the door that must be removed in order to install the cat flap. Be careful not to scratch these objects during the process.

The majority of people who install a cat flap on their own have a standard solid uPVC front door, so they will not have to face these issues. If your door is constructed of wood or has a decorative element that isn't easily removed, this will complicate the job.

It is always worthwhile seeking professional assistance from a cat flap fitter when it comes to these types of jobs as it is crucial to get the job done correctly to avoid potential issues in the future. It is important to get it right, as doing it wrong can damage the door and void the warranty.

Fit the Flap

Once you've got your hole drilled, put the flap on to check if it fits and opens easily. If you spot any areas that stick or catch to the door, smooth them out using a hand file or sandpaper until it fits properly and opens without any problems. Make sure that the flap sits perfectly flush with the door.

Some kits include a template for this however, if it doesn't have a template, you can use a piece or thin paper instead, something similar to tracing paper. Place the paper on the door and draw a line in order to indicate the location where the flap is placed (this will serve as your cutting guide). Then, using the pencil lines you've drawn on the door, draw four screw holes in the corners of the flap - these are the screw holes you'll use to put it in place.

Most uPVC doors are strong and easy to cut. However, if your door is made from GRP or a composite material, this can be more complicated. If you're unfamiliar with this, it might be wise to get a professional to handle the job for you. They can also advise you on whether or not your specific door is suitable for installation of a cat flap.


It is possible to install an opening for a cat flap in composite doors but it's important to check with the manufacturers or a professional joiner prior to making any changes because any changes to these doors may invalidate the warranty. If you do decide to complete the task yourself, be aware that this could be a messy and potentially dangerous job.

With composite doors, you'll typically need to use the aid of a saw or grinder to cut through the door's frame instead of just cutting through the GRP. Be aware that this could be very dangerous and you'll need to take extreme care not to harm the door or yourself as it's extremely fragile. It's worth noting that it's more difficult to create the door glass than in a uPVC door or solid wood door.