How to Install a Pet Door in a Wall or Door

By Petmate | Published: 2026-10-21

Category: How-to Guides

Learn how to install a pet door in a wall or door with this step-by-step guide. Includes tips for measuring, cutting, and fitting a replacement door for your pet's kennel.

Quick Answer

To install a pet door in a wall or door, measure your pet's height and width, choose the right location, cut the opening, and secure the door frame. For kennel doors, measure the kennel length to ensure a proper fit.

Choosing the Right Location

Decide whether you want the pet door in an exterior wall, interior wall, or an existing door. Exterior walls require weatherproofing and insulation, while interior doors are simpler but may not lead to a secure outdoor area.

For kennel doors, the location is predetermined by the kennel itself. Measure the kennel length from front to back to confirm compatibility with replacement doors like the Petmate 21" Ultra Vari Kennel Replacement Door.

Tools and Materials Needed

You'll need a tape measure, pencil, level, jigsaw or hole saw, drill, screws, and the pet door kit. For wall installations, add a stud finder, drywall saw, and insulation. For kennel doors, a screwdriver and the replacement door panel are sufficient.

Step-by-Step Installation Process

Measure Your Pet and the Opening: Measure your pet's height at the shoulder and width at the chest. Add 2 inches to each dimension for clearance. For kennel doors, measure the kennel length from front door to back to ensure the replacement door fits. Common mistake: Not adding clearance, causing the pet to struggle or the door to jam.
Mark and Cut the Opening: Use a level to mark a rectangle on the wall or door at the correct height. For walls, cut through drywall with a drywall saw; for doors, use a jigsaw. For kennel doors, remove the old door panel by unscrewing it. Checkpoint: Ensure the cutout is slightly smaller than the door frame to allow for a snug fit.
Install the Door Frame and Flap: Insert the door frame into the opening and secure it with screws. Attach the flap according to the manufacturer's instructions. For kennel replacement doors, screw the new door panel into the kennel frame. Common mistake: Overtightening screws can warp the frame; tighten until snug, then stop.
Test and Adjust: Open and close the door several times to ensure smooth operation. For wall installations, check for drafts and apply weatherstripping if needed. For kennel doors, ensure the door latches securely. If the door sticks, sand the edges lightly or adjust the screw tension.

Product Facts

21" Ultra Vari Kennel Replacement Door: The Petmate 21" Ultra Vari Kennel Replacement Door is specifically for the Petmate 21" Ultra Vari Kennel and can also fit the 21" Petmate Sky Kennel, but does not meet IATA requirements. If you need an IATA-compliant door for air travel, this replacement door is not suitable; for home use, it's a cost-effective fix for a damaged or worn kennel door.
21" Ultra Vari Kennel Replacement Door