Expert Cat and Dog Flap Installation in North London
Fitting a cat flap or dog flap often requires specialised tools and expertise, which is why we recommend our reliable and professional glaziers for your pet flap installation in North London.

We specialize in the installation of dog and cat flaps across North London. Our team ensures a quick, efficient, and hassle-free installation at a time that suits you. Plus, we offer a no call-out fee policy.
Can you fit a cat flap in double glazing in North London?
Yes, we are specialists in installing pet flaps in double glazing. Our expert team ensures the installation is completed with precision, sealing the flap correctly to prevent any potential condensation problems. For your peace of mind, we offer a 5-year guarantee on all our installations.

We can install pet flaps in:
- UPVC door panels
- Porches
- Sliding patio doors
- Glass doors
- Conservatories
- Cat flaps into double glazing
- Wooden doors
- Windows
- Composite doors
- Double and single glazed units
- Aluminium and metal skinned doors
- French doors
Contact us today for a professional, reliable installation service in North London

Expert Cat Flap Installation for Double-Glazed Patio Doors and Side Panels in North London
At Cat Flaps North London, we specialise in supplying and fitting high-quality cat flaps for double-glazed patio doors and side panels. Whether you need a new cat flap or a replacement unit, our professional installation process ensures safety, durability, and convenience.

How We Install Cat Flaps in Double-Glazed Patio Doors
Step 1: On-Site Measurement
We arrange a convenient time to visit your property and take precise measurements of your current glass patio door. This ensures the new unit fits perfectly.
Step 2: Custom Glass Preparation
We cut two new pieces of 4mm float glass, available in plain or patterned designs, to match your current door. A circular hole is precision-cut for the cat flap, and the glass is toughened for safety.
Step 3: Toughening Process
The glass is sent to a specialised toughening plant. This process takes approximately 2-3 days to ensure the glass is compliant with safety standards.
Step 4: Double-Glazed Unit Creation
The toughened glass is crafted into a sealed double-glazed unit, featuring the perfectly positioned hole for the cat flap installation.
Step 5: Final Installation
We coordinate a time to replace your existing glass with the new double-glazed unit. Once installed, the cat flap is securely fitted on-site.
Frequently Asked Questions
Q: Can you install a cat flap in my existing double-glazed patio door?
A: Unfortunately, no. Double-glazed units in patio doors are typically made with toughened or laminated safety glass, which cannot be cut without shattering. A replacement unit is required. We recommend storing the old unit for potential future use to save costs.
Q: I already have toughened glass in my patio door. Can you cut it to install a cat flap?
A: No, cutting toughened glass is not possible as it will shatter into small fragments. A new custom glass unit will be needed.
Q: Can I use any cat flap for my patio door?
A: No, the cat flap must be designed specifically for glass installations and should be circular. While square holes are possible, they are significantly more expensive to cut.
Q: Do you supply cat flaps?
A: Yes, we offer a wide selection of cat flaps, including manual, automatic, and microchip-operated models. We recommend consulting with us to choose the right cat flap for your needs. Visit our site for links to trusted cat flap brands.
Why Choose Us for Your Cat Flap Installation in North London?
- Expertise in working with double-glazed units.
- Safe and professional installation process.
- Custom-made glass tailored to your patio door.
- Wide range of cat flap options to suit your needs.
Contact us today to schedule a consultation or to learn more about our services!
Cat Flaps in Wooden Doors - Cat Flaps in UPVc Panels - Cat Flaps in Glass & Double Glazing - Dog Flaps