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Pet Flap Installations For
Double Glazing

Installing Pet Flaps Into Double Glazing

If you’re considering installing a pet flap into double glazing, you should not undertake the project yourself. A pet flap cannot be installed into existing double glazing; a new sealed unit has to be manufactured and the hole for the pet flap is cut into the two sheets of glass during manufacture. The glass is then toughened in a big furnace before the two sheets of glass are assembled into the new sealed unit.

If you were to try to cut into existing glass, it will shatter into millions of pieces (like a car windscreen does when it breaks) as all glass has to be toughened safety glass by law. At Pet Flaps UK, we are experts in all kinds of pet flap installations, and we use manufacturers of new sealed units who work to the highest standards. If you’re considering installing a pet flap into double glazing, don’t try to do it yourself – call our friendly, knowledgeable team.

Cat Flap into Double Glazing
Cat Flap for Glass

Why Install A Pet Flap Into Double Glazing?

For some homeowners, the only useful place for a pet door installation is a glass window or door. By installing a new double glazing sealed unit this can result in a neat and tidy installation into double glazing. If you don’t have a suitable wooden door or wall into which you can install a pet flap, a professional can install a pet flap into double glazing.

Hiring a professional for your cat flap or dog door installation will give you the peace of mind that comes from knowing your pet door installation will be done thoroughly, professionally, and neatly.

What about a cat flap or dog door into triple glazing?

Because triple glazing is more expensive than double glazing, you may be hesitant to install a pet flap in triple glazing. Many glaziers are unable to install a pet flap into triple glazing because of the skills required. However, when you use Pet Flaps UK for your pet flap installation, it can be done safely and carefully.

Whether you don’t have room to install a pet flap anywhere else or would just prefer for aesthetic reasons that the pet flap be installed in your triple-glazed window or door, a pet door installation expert can help. Your pet door installation expert will carefully measure to the very tight tolerances required for the new triple glazed sealed unit and the pet flap will be safe for your pet to use.

SureFlap Pet Door for Glass

Pet Doors We Recommend For Double Glazing

Small to Medium Dogs
Extra Large Dogs


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How we work

At Pet Flaps UK, our pet door installation experts can complete cat flap installations in almost any place in your home, including double and triple-glazed windows and doors. When you choose us to install a cat flap into double glazing, you’re getting a team of professionals with years of experience in the industry. As you can tell by our customer reviews, we’ve helped hundreds of families install pet doors for their beloved pets. Before you set up a consultation for pet flap installation, take a look at our process for installing pet flaps into double glazing:

Get in touch

We can provide a no-obligation free quotation after you provide us with a few simple measurements and a couple of photos. We’ll advise you of our recommendations for the best pet flap for your glass window or door. We offer both 4-way pet flaps and specialty pet flaps, and you can choose what works for your budget and needs.

Initial Site Visit & Evaluation

A site survey will be arranged following a deposit payment (or when a successful finance agreement is in place) as part of our order process. We will arrange for one of our team to visit your home and take the final measurements so the replacement glass unit will be manufactured to be the perfect fit. We may also take photos for reference.


Installation of Pet Flap

When your new glass is ready, our experts will make an appointment to come back to your home to install it. We will perform a full fitting and assessment to ensure it works correctly and that you and your pet are satisfied with our work. Your chosen pet flap may be sent directly to you in preparation for the installation or the installer may bring it with them (we will advise which is applicable to your installation).


Our clients love our pet doors and cat flaps! Here are just a few of the many positive reviews we’ve received from satisfied customers who appreciate the quality, durability, and convenience of our products.