Fitting a Cat Flap in a UPVC Door

· 6 min read
Fitting a Cat Flap in a UPVC Door

Allowing your cat to enter and go out of the house at their own pace is a good idea to keep it physically and mentally stimulated. A flap can reduce accidents with toilets by making it easier for cats to leave the house when required.

Take a measurement of the door

A cat flap lets your pet come and go whenever they want without having to open the door. This makes it ideal to keep them inside the home when you're away and helps keep unwanted pests out of the home too!

It is important to measure the door before you purchase a cat flap since there are different sizes available. This will ensure that you purchase the correct size that fits inside your door made of upvc, otherwise, it could be too small or too large and your cat will have trouble using it.

Before you take any action however, you should take a ruler and determine the width of the door in a variety of places along its edge. You should also determine the height of the door in a few spots. A door that is too high will make your cat do a gymnast routine every time it is tempted to use the flap.

If you're not sure of how to measure a door, it might be a good idea to seek assistance from a glazier or someone who is familiar with this type of work frequently. They'll be able to determine if your door is suitable for cat flaps and can help you decide on the size of flap to purchase.


Draw the outline of the hole on your door once you have your measurements. This will give you a guide when it comes to cutting the hole and will help you avoid making an error that will cost you money in the future!

It is also important to ensure that the hole you're creating is in the right place. If you're fitting a cat flap to an outdoor door, it's important that the hole does not be too close to hinges. This could result in leakage or issues with the seal.

If you have a glass door it is best to delegate this task to a professional glazier. It can be difficult to fit a cat-flap into an existing pane. You may also find that it cracks and loses its weatherproof seal.

Measure the Cat

A cat flap lets your pet leave and come back whenever they want without you having to leave him alone. It also helps stop draughts from entering your house, which aren't good for you or your cat!

However, if you own a uPVC or composite door it may be difficult to install the cat flap. These types of doors are usually constructed of different materials than standard wooden or uPVC doors and the procedure for installing them is different as well. Be sure to check with the manufacturer if it is compatible before you install an uPVC cat flap on your uPVC composite or uPVC door. Modifications can cause warranty issues.

Generally speaking, these types of doors are built to be durable and tough and have insulation built-in. This makes them more resistant to weather elements than other doors, however they can be a challenge to insert an animal flap. If you're unsure about whether your uPVC or composite door is able to accommodate the cat flap, make sure you consult with a professional jointer prior to beginning.

You'll have to measure the height of your child to ensure they pass through the door. This is easiest when they're asleep or calm, so that they aren't moving around too often. Once you have their height and weight, you can determine the distance from their stomach to the floor to determine the position of the bottom of the flap. This position can be outlined on the door.

If you are using power tools to cut your uPVC or composite door, you have be cautious. Cutting into metal can cause cracks, particularly if the area is composed of toughened glass. It is recommended to hire an experienced glass installer to install a cat flap in the pane. This will stop the glass from breaking or becoming hard. A glazier can also supply you with a circular hole for the flap for your cat. This will be less likely to break and is safer for your kitty to use.

Cut the Hole

If not, you can make one yourself with a sheet of paper that is thin (tracing paper is the best choice). If it doesn't, you can make one using the thin paper (tracing paper is ideal). Once the shape has been drawn on the door, you can then use a spirit level to ensure that the design is horizontal. This will allow your cat's flap to be properly seated in the opening and prevent it being able to slide open or closed.

Then, you can employ a jigsaw for cutting out the design that is on the door. Make sure that you're using a blade suitable for use on uPVC doors - usually it will be labelled accordingly however, if not, ask the staff at your DIY store for assistance. Once  www.repairmywindowsanddoors.co.uk  have the hole cut out then place the flap against it and then push it out to ensure that the action of the flap is smooth. If it is bound at any point, use a filer or rasp to remove it.

Also, make sure whether there are no electrical gas or cable lines within the door that you will be cutting through because they could be damaged by your jigsaw. You should also be aware of any handles, or other fixtures on the door that have to be removed to accommodate the cat flap. Be careful not to scratch these objects in the process.

The majority of people who install a cat flap on their own have an ordinary solid uPVC front door, which means they won't have to deal with these issues. But, if your door is made from wood or has a decorative panel that cannot be removed then this will make it more difficult to complete the task.

It is always worth seeking assistance from an expert cat flap fitter for these kinds of jobs because it is crucial to get them right to avoid any possible issues in the future. Getting it wrong can result in the door becoming damaged, which could invalidate the warranty.

Fit the Flap

Once you have cut your hole, you can place the flap to see if it opens and is able to fit. If you notice any points that catch or stick or stick, use a hand-file or sandpaper to smooth them down until they fit perfectly and can be opened without issue. Make sure the flap is in line with the door.

Some kits come with templates for this, but even if yours doesn't have a template, you can use a piece or thin paper instead, something like tracing paper ideally. Place the paper on the door and draw a line where you will need to place the flap (this will serve as your cutting guide). Then using the pencil lines you've made on the door, draw four screw holes in the corners of the flap - these are the screw holes you'll use to fit the flap into the right position.

The majority of uPVC doors are strong and therefore quite straightforward to cut into. However, if your door is made of GRP or a composite, it can be more challenging. If you're not familiar with this, it might be wise to get an expert to complete the job for you. They will also be able determine if your door is suitable for installing the cat flap.

If you are planning to install a cat flap in composite doors, it is important to first consult with the manufacturer or a professional joiner. Any changes made to the doors could invalidate the warranty. If you decide to do the work yourself, keep in mind that it can be messy and could be dangerous.

You'll need a grinder or saw to cut through composite doors rather than only the GRP. This can be a dangerous task, and you'll need to take extra care to ensure that the door is not damaged. It's also worth noting that cutting holes into any type of glass for a door is a lot more difficult than making the same changes in the case of a uPVC or solid wood door.