Cat Flaps for Walls

Yes, cat flaps can be fitted through walls — but only if you use a model with a tunnel system or wall kit. Standard cat flaps are designed for doors and will not work on their own in a wall. Wall installations require tunnel extensions to create a passage through the wall's thickness.

At Catflaps.co.uk, we supply cat flaps and complete wall kits designed specifically for brick, cavity and insulated walls, giving your cat safe access without cutting into doors or glass.

How Cat Flaps Work in Walls

Wall installations use a tunnel system that connects the inside and outside of your property. The cat flap is fitted at one end, and extension tunnels are added to allow it to reach through the wall.

• The cat flap sits on the inside or outside wall face
• Plastic tunnel sections extend through the wall cavity
• Additional extensions can be added for thicker walls
• The system creates a sealed passage for your cat

Each tunnel extension typically adds around 50mm of depth, allowing the system to be customised for different wall thicknesses.

What Wall Thickness Can Be Covered?

Cat flap wall kits are available for a wide range of wall depths, including:

• Up to 172mm (solid or thin cavity walls)
• Up to 272mm (standard cavity walls)
• Up to 322mm (deeper brick walls)
• Up to 372mm (insulated or thick cavity walls)

These kits include the cat flap, tunnel extensions and adaptors needed to complete the installation.

Best Types of Cat Flap for Wall Installation

Microchip Cat Flaps for Walls

Microchip cat flaps are the most secure option for wall installations. They read your cat’s implanted microchip and only unlock for registered pets, preventing stray cats from entering your home.

Manual Cat Flaps with Tunnels

Manual cat flaps with tunnel systems are a simpler, more cost-effective option when selective entry is not required.

Why Use a Wall Instead of a Door?

• Keeps your doors and glass panels intact
• Better positioning for your cat’s access route
• Ideal for utility rooms, kitchens and side walls
• Can improve insulation compared to poorly fitted door flaps

Installation Overview

1. Choose a cat flap designed for wall installation
2. Measure the wall thickness
3. Cut a hole through the wall to the required size
4. Install the tunnel system through the wall
5. Fit the cat flap to the tunnel opening
6. Seal around the edges for weather protection

Wall installations usually require basic building work and are often completed by a builder or experienced installer.

Important Things to Consider

• Wall thickness: determines how many tunnel extensions are needed
• Insulation: draught-proof designs help reduce heat loss
• Positioning: avoid pipes, cables and structural elements
• Security: microchip models provide the highest level of control

Frequently Asked Questions

Can any cat flap be fitted through a wall?

No. Only cat flaps with tunnel systems or dedicated wall kits are suitable for wall installation.

How thick a wall can a cat flap go through?

With extension tunnels, installations can typically cover walls from around 100mm up to 300mm+ depending on the kit used.

Do wall cat flaps cause draughts?

Good quality wall kits include draught excluders and sealed tunnels to minimise heat loss.

Is it better to install a cat flap in a wall or a door?

A wall installation is often better if you want to avoid cutting into doors or glass, especially for more permanent or insulated setups.

Shop Cat Flaps for Walls

Browse our range of cat flaps with tunnel systems and wall kits below, suitable for everything from standard cavity walls to thick insulated brick walls. If you are unsure which kit you need, contact us before ordering and we will help you choose the correct setup.