Cat Flap Installation in a Brick Wall

Security experts will probably tell you cat flap installation in a brick wall is best, for security reasons, as the cat door can weaken the door itself. Anyway…

Each microchip pet door will have slightly different ways to install them, as they differ between brands and products. There are, however, similarities between them all though. First, the microchip pet door should be set up for all your pets. This can be done after installation but is best done beforehand. See here how to set up for your microchip cat flap.

cat flap in wall

Installing a microchip pet door through a brick wall requires a fair amount of skill and experience on your and if you do not feel comfortable to follow the advice here or the manufacturer’s instructions, then click to find a cat flap fitter in your local area for pet door installation.

Put simply, a hole has to be made in your wall, door or window and then the microchip pet flap can be fixed around it. For step by step instructions on pet door installation into a glass door or window, see below.

If you would like advice on how to install a microchip pet door in a glass door or window, have a look at this cat flap installation in glass post and here for steps installing a microchip cat flap in a uPVC or a wooden door.

Cat flap installation in a brick wall


SureFlap Microchip Cat Flap Tunnel Extender in White
List Price: £6.99
(as of 03/28/2024 04:43 PST - Details)

Cat flap installation in a brick wall is messy and very involved. It is recommended that you consult with a builder before starting work on installing a pet door in a wall, unless you have relevant building experience. It may help to stick on masking tape where you are to make pencil marks to outline the microchip cat flap if there are tiles or a dark painted surface.

Measure the height of your pet’s stomach off the floor. Mark the height of your pet’s stomach on your wall. This will be where you will place the bottom of the inside of the pet door, so your pet can walk through the pet door comfortably. If you have more than one pet that will be using the microchip pet flap, make sure that the smallest measurement from your pets’ stomachs to the floor is used. Make this mark where you want the centre of the microchip pet door to be, horizontally, and also mark this on the inside frame of the cat flap.

Breaking through the wall for the cat flap installation

Use a hammer drill with the correct drill bit to drill through the wall to create a reference point. Drill around the pencil outline, overlapping the line by about 2mm or 5/64 Inches. A masonry drill bit should be used to drill through the entire wall. If you do not already own one, a breaker can be hired for a day to remove the bricks and tiles from both inside and outside. Use a tunnel extender to check if you have broken enough out, by passing it through the hole, both inside and outside. Any obstructions are bits that still need to be broken out.

Clear away any dust and debris that could work its way into the cat flap mechanism and you may need to add some cement if you have made the hole too big in places, to fill it in. A vacuum cleaner can be used close to the drill bit to remove the fine brick dust before it fills your room.

Fitting the cat flap into the wall

Now drill on the cat flap inside frame to the inside of the wall. This should be done by removing the button cover to the inside frame, by unscrewing the screws. Measure how many tunnel extenders you require to pass through the hole in the wall. The tunnel extenders should be fixed together with all weather tape and taped to the inside frame of the cat flap.Then the tunnel should extend into the inside and outside frames of the pet flap.

The tunnel and inside frame can be fixed to the wall by drilling the screw holes with a masonry drill bit and putting in wall plugs. The inside frame of the pet door can now be screwed in by hand. The outside frame of the pet flap can now be put in place and the holes can be drilled in the outside of the brick wall. This should be done just like the inside frame screws. The button cover can now be put back in place.

cat flap in wall

To finish, apply an all weather sealant between the tunnel and outside frame cover and between the outside frame cover and the wall.

Brick wall cat flap installation video

Check out this great video of a microchip cat flap installation in a brick wall by Sureflap

Let me know what you guys think about this post for installing your microchip cat flap in a brick wall

Take a look at our one of recommended microchip cat flaps, the Sureflap DualScan Microchip Cat Flap

In fact, if you would like to support me, George and this website, then please click on the adverts and the links to Amazon on the pages 🙂

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Cat Flap Installation in Wooden Door or uPVC Door

Each cat flap installation in wooden door or uPVC door will be slightly different, as they differ between brands and products. There are, however, similarities between them all though. First, the microchip pet door should be set up for all your pets. This can be done after installation, but is best done beforehand. See here for how to set up for your microchip cat flap.

Don’t feel comfortable to follow the advice here or the manufacturer’s instructions? Then click to find a professional pet flap fitter  in your local area for pet door installation.

Put simply, a hole has to be made in your wall, door or window and then the microchip pet flap can be fixed around it. For step by step instructions on cat flap installation in wooden door, see below.

After advice on how to install a microchip pet door in a glass door or window?

Cat flap in a wooden door

uPVC and wooden doors

Measure the height of your pet’s stomach off the floor. Mark the height of your pet’s stomach on your door. This will be where you will place the bottom of the inside of the pet door, so your pet can walk through the pet door comfortably. If you have more than one pet that will be using the microchip pet flap, make sure that the smallest measurement from your pets’ stomachs to the floor is used. Make this mark where you want the centre of the microchip pet door to be, horizontally. Also mark this on the inside frame of the cat flap.

Using this mark on the door as the centre of the inside bottom face of the pet flap, fix the cat flap frame to the door with tape or Blu Tac. Then draw the inside line of the cat flap frame on the door. The idea is to match up the centre mark on the door with the centre mark on the cat flap frame. It would help to use a spirit level to check whether the microchip cat door is to be level. Mark where the drill holes for the microchip cat flap frame are to go.

Cat_flap wooden door

Making a hole in a wooden door for a cat flap

With a large drill bit, make holes in the corner of the outline. These holes need to be large enough to fit a jigsaw drill into. It is recommended to drill from both sides to avoid splintering. Take care to make sure that the holes will line up. To do this make sure that you have outlines drawn on both sides of the door that line up.

Then cut the outline out with the jigsaw drill carefully. Drill the holes for the microchip cat flap screws. The size of the holes will depend on which microchip cat flap you buy. Screw the microchip pet flap into place and make sure that the frame with the buttons is on the inside. Use a hand screw driver as opposed to a power screw driver to prevent over tightening the screws.

Your microchip cat flap should now be completely installed, but that will depend on which microchip pet flap you have.

Have a look at this great Sureflap video for a microchip cat flap installation in a door.

Cat flap installation in wooden door

Let me know what you guys think about this post for a cat flap installation in a wooden door or uPVC door.

Take a look at our recommended microchip cat flaps, the Sureflap Microchip Cat Flap and the Sureflap Dualscan cat flap.