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Cat Flaps In London

Call us now for expert cat flap fitting, 30 – 90 minute response time with no call-out fee. We can fit in single and double-glazed glass, UPVC, and wood doors.

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Cat Flap Fitting in London: Expert Installation for Glass, Doors and Double Glazing

London is one of the most architecturally varied cities in the UK, with housing stock ranging from Victorian terraces in Hackney and Islington to purpose-built flats in Canary Wharf and Georgian townhouses across Kensington. The mix of period sash windows, modern sealed units, and uPVC frames means cat flap fitting here requires a glazier who understands the full range of installation scenarios.

Montrose Glass provides cat flap fitting in London and is available 24 hours a day, 7 days a week, 365 days a year. Whether you need a cat flap installation in London for a timber door, a uPVC frame, a single glazed panel, or a sealed double glazed unit, our glaziers carry the materials and equipment to complete most jobs on the same visit. As a family-run business with over 20 years of industry experience, Montrose Glass is a familiar name to homeowners and property managers across the capital, from the inner boroughs to the outer suburbs.

If you need pet door installation in London, the process starts with a single call. There is no call-out fee, and a glazier can typically reach you within 30 to 90 minutes in most circumstances. Our Window Glazing services cover the full range of residential and commercial glazing needs across London, and cat flap fitting is a core part of what we do.

Why Choose Montrose For Cat Flap Installation?

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What Does Cat Flap Installation in London Actually Involve?

Cat flap fitting in London covers several different installation types, and the right approach depends entirely on where you want the flap positioned. The most common options are fitting into a uPVC or timber door, fitting into a single glazed panel, fitting into a double glazed unit, or cutting through a wall. Each requires a different method, and a glazier will assess the situation on site before any work begins.

For cat flap fitted in glass in London, whether single or double glazed, the process involves precise glass cutting and careful measurement. A cat flap cannot simply be cut into an existing sealed double glazed unit without breaking the gas-filled seal between the panes, which causes the unit to mist from the inside. Instead, Montrose Glass supplies a new toughened glass pane with the cat flap hole already cut and the flap fitted, then installs this new unit into your existing frame. This preserves the integrity of the sealed unit and keeps the window weatherproof. Our vans are stocked with glass that can be cut and prepared on site, meaning many jobs are completed in a single visit without the need for a return appointment.

When it comes to flap type, you have several options. A microchip cat flap reads your pet’s implanted chip and only unlocks for registered animals, which is a sensible choice for homes in busier London neighbourhoods where local cats might otherwise wander in. A locking cat flap gives you manual control over entry and exit, which suits households with night-time curfew routines. Standard four-way locking flaps are also available for straightforward access control. A glazier will talk through the options with you and advise on the flap size needed based on your pet.

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Why Does Professional Cat Flap Fitting Matter in London?

Attempting to cut a hole in glass without the correct tools and training is dangerous and almost always results in a cracked or shattered pane. Beyond the risk of breakage, an ill-fitting cat flap creates gaps around the frame that let in cold air, rain, and draughts, which is a significant problem in London’s older housing stock where windows are already a primary source of heat loss. In a period terrace or a Victorian conversion flat, a poorly fitted pet door can undo the thermal performance of the rest of the window.

For double glazing specifically, the sealed unit is a factory-manufactured component. Cutting into it breaks the argon or air seal between the panes, and once that seal is gone the unit will mist permanently and lose its insulating properties. The only correct solution for a double glazed cat flap in London is a new toughened glass unit with the aperture cut before the unit is sealed. Montrose Glass supplies and installs this as a complete service, so you receive a window that meets current safety standards and performs as it should. This is especially relevant in conservation areas across London, where planning conditions may also apply to window modifications. If you are considering wider glazing work at the same time, our Double Glazing service covers full unit replacement across London.

A professional cat flap glazier in London also ensures the flap itself is correctly aligned and sealed at the edges, preventing water ingress around the frame. Silicone finishing and correct beading are part of every installation. The result is a flap that opens smoothly, closes fully, and does not rattle in the wind, which matters in exposed upper-floor flats and houses on open streets.

Montrose Glass have experience in installing cat flaps for windows in London to give your pet a custom entrance to your home where needed.
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Client Testimonials
Here are some testimonials from our valued customers in London who have experienced our exceptional services. As proud members of the Guild of Master Craftsmen, we prioritise delivering a cost-efficient service that guarantees quality workmanship. If you have any inquiries or require further information, please don't hesitate to contact us.
“
Superb service. The guys were out on time and the job was completed within an hour, including a full clean up. Would definitely use again.
Russell Haselhurst
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We used Montrose Glass for a construction project in London recently. They were fantastic. Service was great, as was the workmanship. The 2 glaziers are a credit to the company. Also, they turned up and carried out the works during heavy snowfall without complaint. We would definitely recommend them.
Christine S
“
I needed to get some work done for quite a while on my house, but kept putting it off - after a couple of calls to Montrose Glass I felt comfortable discussing it and they made it so easy and simple that I\'ve decided to get it all sorted. Great service and I have already got them quoting my mums house and will have no worries referring them on in the future.
Tom Bell
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Frequently Asked Questions About Cat Flap Fitting in London

The questions below cover the most common things London homeowners ask before booking a cat flap installation. Each answer is written to give you a clear, complete response without needing to read the rest of the page.

Yes, Montrose Glass covers the whole of London, including inner boroughs and outer suburbs. The service is available 24 hours a day, 7 days a week, 365 days a year, and Montrose Glass also operates nationwide across the UK. Wherever your property is located in London, a glazier can be dispatched to you.

In most circumstances, a Montrose Glass glazier can reach your London address within 30 to 90 minutes of your call. This response time applies around the clock, including weekends and bank holidays. The 24/7 availability means you are never left waiting until the next working day.

There is no call-out fee for cat flap fitting in London. A Montrose Glass glazier will attend your property, assess the installation, and provide a clear price at no charge before any work is agreed. You only pay if you decide to proceed with the job.

Yes, Montrose Glass fits cat flaps into double glazing in London. A cat flap cannot be cut into an existing sealed double glazed unit without breaking the seal, so Montrose Glass supplies a new toughened glass unit with the cat flap already fitted and installs it into your existing frame. This keeps the window sealed, secure, and weatherproof. A glazier will measure and advise on the options at no call-out charge.

Montrose Glass can fit a range of cat flap types in London, including microchip cat flaps, locking cat flaps, and standard four-way flaps, into glass, uPVC doors, timber doors, and walls. A microchip cat flap is a popular choice for London properties as it only unlocks for your registered pet, keeping other animals out. A glazier will advise on the best option for your specific door or window type during the on-site assessment.

Montrose Glass are the professional, reliable and cost-effective fast response glazing specialists for your glass and glazing needs - 24 hours a day, 365 days a year.

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