- Measure the opening for the microwave. It should fit into the opening with at least 1 inch of clearance on each side. The opening should be 1 inch away from any cabinets and 3 inches from an oven.
- Remove all loose items, like the turntable, from the microwave. Place the microwave inside the opening and center it. Plug the microwave into the opening's built-in wall socket.
- Use a set of trim panels to cover the open spaces. If your microwave came with a built-in installation kit, these should be included. Otherwise, consult a hardware store expert for the exact parts you'll need.
- Attach the panels to the sides of the opening with screws. Make sure the microwave is directly up against the panels and the microwave door can still open.
- Place the turntable and any other contents back in the microwave. Test the microwave by placing a cup of water inside and cooking for 1 minute at full power.
- If your microwave came with a built-in microwave kit, follow its instructions exactly.
- You may need to drill small holes into the opening before attaching the panels. Remove the microwave before doing this and replace it afterward.