Cat Flap in a Patio Door
Fitting a cat flap in a patio door is one of our most popular installations. Because patio doors use toughened glass, we replace the pane with a new toughened panel that has the cat flap hole pre-cut — your door still slides, locks and seals exactly as before.
How We Fit Patio Door Cat Flaps
Patio door glass is always toughened — it can't be cut, drilled or scored. So we measure the pane, order a like-for-like replacement with the cat flap aperture pre-cut before toughening, then return to swap the panel and install your cat flap with a full weatherproof seal. On sliding patios we usually fit into the fixed pane so the sliding mechanism is untouched.
- Sliding, hinged & French patio doors
- Single, double and triple glazed
- Fitted into fixed or sliding pane
- Microchip cat flaps fully supported
- Door continues to slide & lock normally
- Fixed-price quotes from £280

Patio Door Cat Flap FAQs
Our Installation Services
Related Guides
Can You Put a Cat Flap in a Sliding Patio Door?
Sliding patio doors are trickier than standard French doors, but a cat flap is absolutely possible. Here's how we do it and what your options are.
Buyer's GuidesCan You Put a Dog Flap in a Glass Door? (UK Guide 2026)
The short answer is yes — and it's more common than you think. Here's how a dog flap is fitted into a glass patio or French door in the UK, which brands work best, and what to budget.
Installation GuidesCat Flap in a Glass Door: The Complete UK Guide (2026)
Glass is the most-asked-about door type we install into — and the most misunderstood. This guide walks you through exactly how a cat flap goes into a glass door in the UK, what it costs, and how long it takes.
ComparisonCat Flap in a Glass Door vs Window: Which Is Better?
Can't decide between a glass door or window cat flap? We compare both options to help you choose the best location for your cat and your home.
Get a Free Patio Door Cat Flap Quote
Send us a photo of your patio door for a fixed-price quote within 24 hours.