How to Install an Over-the-Range Microwave

Over-the-range microwave installation in brief

An over-the-range microwave replaces a range hood and sits above your cooktop. It saves counter space and combines a microwave, cooktop light, and exhaust fan in one unit. Installation is different from a countertop model because the microwave must be supported by a wall mounting plate and bolted to the upper cabinet, not just set on a surface.

Before you start, review your manual. The manual contains the template, the mounting plate, and the hardware needed for most installations. If you are shopping for a new unit, compare models by capacity and wattage, and check our best over-the-range microwaves guide. Also read how to measure for a microwave so the unit fits the space before you lift it.

Safety and preparation first

Turn off the power at the circuit breaker before working near the outlet or wiring. Most over-the-range microwaves plug into a wall outlet behind the cabinet, but some are hardwired. If you are not comfortable checking voltage, call a licensed electrician. See microwave electrical requirements for wiring basics.

Microwave ovens sold in the United States are regulated as radiation-emitting products under the FDA's Electronic Product Radiation Control Program. You do not need to take apart the high-voltage components during installation. Leave those components alone. Your job is to mount the unit, connect the vent, and restore power.

Plan for a helper. An over-the-range microwave is heavy and awkward to lift overhead. A helper reduces the chance of dropping the unit or damaging the cabinet. Use a stud finder, a level, a drill, sockets, and a screwdriver. Wear work gloves and eye protection.

Place the mounting template correctly

The template is a large paper sheet that shows the cutout outline, centerline, mounting holes, and stud locations. Tape it to the wall and the underside of the cabinet exactly where the microwave will sit. Use the centerline from the template to align with the center of the range or cooktop below.

Use a stud finder to locate studs behind the drywall. Mark both edges of each stud on the template. The template holes are a guide, but the mounting screws must enter wood studs, not just drywall, because the plate carries most of the microwave's weight. If your layout does not align, adjust the template before drilling. More detail on the hardware is in microwave mounting template and hardware.

Check the cabinet opening height, depth, and width against the template and the microwave's clearance requirements. Low-clearance situations need a low-profile model, so see over-the-range microwave height and the low-profile over-the-range microwaves discussion before you commit.

Attach the mounting plate

The mounting plate is a metal bracket that attaches to the wall studs. Most plates have keyhole slots or tabs at the top that catch the microwave's rear hooks. Position the plate over the marks on the template, make sure it is level, and drive the lag screws into the studs. Tighten them firmly, but do not strip the threads.

If the wall surface is tile, stone, or a thick backsplash, follow the manual's instructions for anchors or blocking. The plate must sit flat against the wall. If the plate rocks, shim it behind the plate so the microwave hangs evenly. A crooked plate makes the microwave door hard to align.

Lift the microwave and secure it to the cabinet

With your helper, lift the microwave and tilt it slightly upward at the front. Align the rear slots or hooks on the bottom of the microwave with the tabs on the mounting plate. Push the unit toward the wall until it locks into place. Do not let the unit rest on the cooktop; it should hang from the plate.

Reach into the upper cabinet and locate the two or more mounting bolts. The bolts pass through the cabinet bottom into threaded holes on top of the microwave. Start each bolt by hand, then tighten them evenly with a socket. Keep the microwave level while you work. If you need to adjust the position, loosen the bolts, shift the unit, and retighten.

Before you fully tighten the top bolts, complete the vent connection if your microwave is vented to the outside. Confirm that the exhaust damper opens freely and that the duct attaches to the microwave outlet without crushing the damper. See over-the-range venting types for duct and damper options.

Connect the vent system

A vented over-the-range microwave can blow air through the back, through the top, or up through the cabinet. For a top-venting model, attach the transition duct to the top of the microwave, then connect it to the house duct. Use foil tape on the joints. Do not use sheet-metal screws where they could interfere with the damper blade.

If your kitchen does not have outside ducting, use the recirculating mode. The manual will tell you to install a charcoal filter and route the air through the top grille. Clean or replace the filter according to the schedule in your manual. You can also compare ventilation airflow and over-the-range microwave filters to understand what your model needs.

Final checks before restoring power

After the microwave is secure and the vent is connected, restore power at the breaker. Turn on the cooktop light, the fan, and the microwave controls. Run the microwave with a small cup of water and observe that it heats normally. If the unit vibrates or the door does not seal, loosen the top bolts, reposition, and tighten again.

When you replace an old over-the-range microwave, recycle the old appliance rather than putting it in the trash. The EPA encourages donating or recycling electronics to conserve resources. See how to recycle an old microwave and your local recycling program for options.

Keep the manual, template, and warranty information in a safe place. If you move the microwave later, the template and hardware will help you reinstall it correctly. For installation questions, the manufacturer's owner resources and service pages are the best source for model-specific instructions.

When you use the microwave, follow food-safety guidance from the FDA: cover food, stir, rotate, and allow standing time before checking the internal temperature with a food thermometer.

What to pick for your use

Questions

Can one person install an over-the-range microwave?

It is possible, but not recommended. The unit is heavy and has to be lifted over a cooktop while aligning it with the mounting plate. A helper makes the job safer and reduces the risk of damage.

Do I have to use the mounting plate?

Yes for nearly every model. The mounting plate transfers the weight to the wall studs. The cabinet bolts keep the microwave from tipping, but they are not a substitute for the plate.

What if I do not have outside venting?

Use recirculating mode with a charcoal filter. Your manual will show the filter and the vent direction. The microwave will still filter cooking odors through the charcoal, but it will not push air outside.

How long does installation take?

Plan for a few hours the first time. The work includes removing the old hood or microwave, checking the electrical supply, placing the template, attaching the plate, lifting the unit, connecting the vent, and testing all controls.

Should I hire a professional?

If you are unsure about wall construction, electrical work, or ducting, a professional installer is a good option. The main risks are heavy lifting, missing a stud, and connecting the vent incorrectly. A licensed electrician should handle any hardwiring changes.