Many homeowners want to install a cat flap in a glass door or window but often wonder if it’s actually possible with double glazing. The short answer is yes — but it must be done correctly.
Why Double Glazing Cannot Be Cut
Double glazed units are manufactured with two panes of glass sealed together with an insulated gap between them. This sealed unit helps keep heat inside your home and improves energy efficiency.
Because of this design, existing double glazing cannot be cut after it has been manufactured. Attempting to drill or cut the glass will break the seal and damage the entire unit.
The correct solution is to replace the glass with a new sealed double glazed unit that already includes a precision-cut hole for the cat flap.
How Cat Flaps Are Installed in Glass
Professional installers follow a simple process to ensure a safe and clean installation:
- Measure the existing glass panel
- Order a bespoke double glazed unit with a pre-cut hole
- Manufacture the sealed unit to the exact size
- Replace the existing glass panel
- Install the cat flap securely
This process ensures your door or window remains fully sealed, insulated, and secure.
Benefits of Installing a Cat Flap in Glass
Installing a cat flap in a glass panel offers several advantages:
• Allows pets to move freely between indoors and outdoors
• Maintains the appearance of your doors and windows
• Keeps your home energy efficient
• Avoids damage to existing doors or frames
It’s a clean and professional solution compared to cutting into wooden doors or walls.
Choosing the Right Cat Flap
There are several types of cat flaps available for glass installations, including:
Manual Cat Flaps – Simple entry and exit for pets.
Microchip Cat Flaps – Only open for your pet’s microchip, preventing stray animals from entering.
Microchip cat flaps are becoming increasingly popular for homeowners who want added security and control.
Professional Installation Matters
Installing a cat flap in double glazing requires accurate measurements and properly manufactured sealed units. Using a professional installer ensures the new glass fits perfectly and maintains the structural integrity of your door or window.
If you’re considering installing a cat flap in your glass door or window, it’s always best to use a specialist who works with double glazed units designed specifically for cat flaps.
