Notes

Fitting a Cat Flap in a UPVC Door
The freedom to let your cat go in and out of the house at will is a great method to keep your pet active and mentally stimulated. Having a flap can also aid in reducing toilet accidents by making it easier for your cat to leave the house when it is required to.

Take a measurement of the door

A cat flap allows your pet to move around as they want without having to open the door. This is a great method to keep your pet safe in the house when you are away or at home. It also helps keep unwanted pests from entering.

It is important to measure the door to ensure that you have the right size cat flap. There are various sizes available. It is then possible to ensure that the cat flap is the right size for your door made of upvc. Otherwise, it could be too big or small and your cat might have trouble using it.

Before doing anything, though, take a ruler and take measurements of the width of the door in various locations along its edge. You should also take measurements of the height of the door in a few spots. This is because the door that is too high can cause your cat to do an exercise routine like a gymnast every time they need to use the flap!

If you're not sure how to measure the door, it may be a good idea to seek assistance from a glazier or someone who performs this type of work regularly. They will be able determine whether your door is suitable for cat flaps and advise you on what size flap to purchase.

When browse around this website got your measurements, the next step to do is to draw the outline of the hole in the door. This will give you a guide when it comes to cutting the hole and will help you avoid making a mistake that could cost you money in the future!

Make sure to put holes in the right position. For instance, if installing the cat flap inside the patio door, it is important that the hole is not too close to hinges, as this can cause leakage and problems with the seal.

It is best to leave the job of installing the cat flap on the glass door to a professional glazier. It may be difficult to install a cat-flap within an existing pane. It is also possible that it breaks and loses its weatherproof seal.

Measure the Cat

A cat flap allows your pet to come and go whenever they wish without having to leave him alone. It also stops draughts from entering your home, which isn't beneficial for you or your cat.

However, if you own a uPVC or composite door it can seem tricky to fit the cat flap. These doors are made from different materials and the process of installing them is different. Be sure to check with the manufacturer if the door is compatible before you install the cat flap on your uPVC composite or uPVC door. Modifications can invalidate warranties.

Generally speaking, these kinds of doors are made to be tough and durable, with insulation built in. This makes them more resistant to weather elements than other doors, but they may be a challenge to insert the cat flap. If you're unsure about whether your uPVC or composite door is able to accommodate a cat flap, check with a professional joiner before starting.

To make sure that your cat can access the door, you'll need take a measurement of their height. It's easier to measure their height when they're at peace or asleep, which means they don't sway around. Once you've determined their height, measure the distance between their stomachs and the floor to determine where the bottom of the cat flap should go. This position can be marked on the door.

When you use power tools to cut your uPVC or composite door, you have be extra cautious. Cutting into metal can cause it crack, especially when the area is composed of toughened glass. This is why it's advisable to hire an expert glazier to install your cat flap inside a pane of glass. This will stop the glass from becoming fragile or shattering. A glazier can also supply you with a circular hole to use for the cat flap, which is less likely to break and is safer for your cat to use.

Cut the Hole

If it does not, you can make one yourself with a sheet of thin paper (tracing paper is ideal). If it doesn't, create your own by using a thin piece of paper (tracing papers are ideal). Once the shape has been drawn on the door you can then use a spirit level to ensure that the shape is completely horizontal. This will ensure that your cat flap sits properly in the opening and will not open or close.

Next, take your jigsaw and cut out the shape marked on the door. Make sure that you're using a blade that is suitable for use on uPVC doors. Usually, it will be marked as such If not, ask the staff at your DIY store for assistance. Once you have the hole cut out then place the flap against it and then push it open to ensure that the flap's action is smooth. If it becomes stuck on any points then use a file or rasp to fix it.

Make sure there aren't any gas or electric pipes inside the door you plan to cut through. Your jigsaw could cause damage to them. You should also be aware of any handles, or other fixtures on the door that will need to be removed in order to install the cat flap. Be careful not to damage these items while cutting.

The majority of people who install a cat flap on their own will have the standard solid uPVC front door, meaning they won't be faced with these problems. However, if your door is made from wood or has a decorative panel that cannot be removed then this will increase the difficulty of the job.

It is always advisable to seek assistance from an expert cat flap fitter for these kinds of jobs because it is important to get them right to avoid any potential problems in the future. If you do it wrong, it could result in the door becoming damaged and may invalidate the warranty.

Place the Flap

After you've made your hole cut, put the flap on to check whether it is able to open easily. If you notice any spots that stick or catch or stick, you can file them down using a hand file or sandpaper until it fits correctly and opens without issue. Make sure that the flap is perfectly flush with the door.

If your tool doesn't have a template, you can make use of thin paper such as tracing or Acetate. Lay the paper against the door and mark 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 will be the screw points that you'll use to secure it in the right position.

The majority of uPVC doors are strong and therefore simple to cut into. If the door is made of composite or GRP the process can be more difficult. If you're unfamiliar in this area, it might be advisable to hire a professional to do the work for you. They will also be able tell you if your door is suitable for installing an animal flap.

You can fit a cat flap into composite doors, but it is important to consult with the manufacturer or a professional joiner prior to making any changes as any alterations to these doors could invalidate the warranty. If you decide to tackle the work yourself, bear in mind that this can be messy and even dangerous.


For composite doors, you'll generally require a saw or grinder to cut through the door's panel rather than just through the GRP. Be aware that this can be extremely dangerous work and you'll need to take extreme care not to harm the door or yourself, as it is extremely fragile. It's important to remember that it's more difficult to create the door glass than in a uPVC door or solid wood doors.

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