Cat Flap Co.

    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
    • Prices vary by panel size, flap choice and location
    Cat flap fitted in a sliding patio door

    Patio Door Cat Flap FAQs

    Our Installation Services

    Glass Door Cat Flap FittingUPvc Door Cat Flap FittingComposite Door Cat Flap FittingWooden Door Cat Flap FittingBi-Fold Door Cat Flap FittingAluminium Door Cat Flap FittingWindow Cat Flap FittingFrench Door Cat Flap FittingDog Door FittingMicrochip Dog Door FittingAI & Prey Detection Cat FlapsConservatory Cat Flaps

    Areas We Cover

    ManchesterLiverpoolChesterWarringtonStockportCreweMacclesfieldWirralWrexhamStoke-on-TrentStaffordHuddersfieldBradfordLeedsView all areas →

    Related Guides

    Cat flap professionally fitted in glass
    Advice

    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.

    Dog door fitted in glass
    Buyer's Guides

    Can 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.

    Dog door fitted in glass
    Buyer's Guides

    Best Pet Doors for Sliding Glass Doors USA 2026: Cat & Dog Patio Panels Compared

    For most US homes, a patio panel insert is the easiest way to add a dog or cat door to a sliding glass door: it slots into the track, needs no cutting, and comes out when you move. Owners who want the best insulation and a cleaner look choose a pet door fitted into a new glass panel instead.

    Cat flap professionally fitted in glass
    Buying Guide

    Best Cat Flap for Glass Doors: A Complete Guide

    The best cat flap for a glass door is the Pet-Tek Superior — designed specifically for glass with a round frame that reduces stress on the pane. For microchip security in glass, SureFlap and PetSafe fit into a pre-cut toughened panel using a round mounting adaptor. Toughened glass cannot be cut, so every install uses a brand-new factory pre-cut unit.

    Get a Free Patio Door Cat Flap Quote

    Send us a photo of your patio door for a quote for your job within 24 hours.

    Request Your Free Quote Call 07764 442054