If you want to allow your pet to move around as they please without opening the door, you can put in an animal flap. You should employ an expert to install the flap. They can handle the complexity of putting in different types of cat flaps to different doors and walls.
Installation
With a Cat Flap installation flap, your pet is able to enter and leave the house at any time without having to open the door. There are fitting a cat flap in a upvc door variety of pet flaps that are available that range from microchip-reading doors to fully insulated cats flaps. They come in a variety frames and materials ranging from PVC or plastic to aluminum and stainless. The type of frame you pick will impact the total cost. Plastic and PVC frames are less expensive, but are less durable, whereas stainless steel frames made of aluminum are more expensive, but last longer.
When selecting a frame for your cat flap installation bristol flap, it is important to think about the kind of access you wish to give.