Posted October 13, 2026
SureFlap cat doors can be worth it if your cat needs a private entrance and the local freeloaders have started treating the food bowl like a buffet. They cost more than a standard cat flap and use batteries, but they can help keep unwanted animals out while giving your own pet more freedom. The best option depends on your pet, your home and where the door will be installed.
At Sharp Glass, we install pet doors for Christchurch homes, including standard, electronic, microchip-activated and customer-supplied pet doors. If you are considering a SureFlap or another microchip pet door, it is worth checking the installation requirements before choosing a model.
Most people look at SureFlap because a basic cat flap is no longer doing enough.
A basic flap might be fine in a sheltered hallway door, but it can feel very different on a windy Christchurch day. If the flap rattles, lets in cold air, or sits in an exposed glass door in suburbs like New Brighton, Southshore, Sumner, Redcliffs or Cashmere, the issue is not just pet access. It is comfort, security and control. SureFlap may be worth considering if you want more control at night, while travelling, or when other cats are coming inside and upsetting your own cat.
For Christchurch homes, there is also the fit and sealing question. A flap in an exposed back door or glass slider can rattle, leak or let in cold air if it is not the right product for the location.
SureFlap is a good option if the main issue is unwanted animals entering your home.
SureFlap microchip pet doors recognise your pet’s microchip or a compatible RFID collar tag. Once your pet is registered, the door can unlock for them while staying closed to animals that are not registered.
So, is it worth it? Usually, yes if unwanted cats are the problem. If you only need simple access, a standard flap may do the job.
If your cat is not microchipped, speak with your vet first. The SPCA explains the benefits of microchipping pets, including helping lost pets be reunited with their owners.
The main benefit of SureFlap is better control. Your cat gets freedom, but your home is not open to every animal that pushes through the flap.
The trade-offs are:
The best SureFlap model depends on your pet’s size and how much control you want. There are four to choose from:
If size is your main concern, read our guide on how big a pet door should be.
Before buying a SureFlap, check the pet, the product and the installation location.
The main things to confirm are:
If the pet door is going into glass, also check:
A good product still needs to be fitted and sealed properly. If the location is exposed, read our guide on how to weatherproof a pet door. For more detail, read our guides on how to install a pet door in glass and how to install a cat door in your glass door.
SureFlap installation cost depends on the model, where it is being installed and whether a new glass panel or unit is needed. Glass and double-glazed installs are usually more involved than standard door installs.
Sharp Glass offers free, no-obligation quotes for pet door installation, so you can confirm the right approach before committing.
You can get advice from us before buying the pet door, especially if you are unsure which model suits your pet or the available space. Speak to Sharp Glass if you are considering a SureFlap for glass, double glazing, safety glass or a sliding glass door.
We install standard, electronic, microchip-activated and customer-supplied pet doors for Christchurch homes.
A SureFlap can be a smart upgrade if you want better access control for your pet.
For glass, double glazing, safety glass or sliding doors, Sharp Glass can help you choose the right installation approach and provide a free, no-obligation quote.
Book your pet door installation with Sharp Glass, The Good Guys in Glass.
Yes, if unwanted cats are entering your home or you want better access control. A standard cat flap may be enough if you only need simple access.
Yes, but a double-glazed unit usually needs to be made with the correct opening.
Usually, yes. Sure Petcare says the Microchip Pet Door requires a mounting adaptor for glass installations.
It depends on the glass type and whether the existing panel already has a suitable opening. Double-glazed or toughened safety glass often needs a new panel.
If the pet door is going into glass, speak with a glazier first. This helps confirm the right model and installation approach.
Yes, some SureFlap models can work with a compatible RFID collar tag.
Yes, Sharp Glass can install customer-supplied pet doors, including SureFlap models, where the product and installation location are suitable.