Install a Dishwasher Height Extension Kit: Fit Guide

What a height extension kit does

A dishwasher height extension kit is a set of brackets or spacers that attach to the base of the dishwasher to lift it off the floor. This is useful when the opening beneath a counter is taller than the dishwasher itself, leaving a visible gap at the bottom. Kits are typically sold by the manufacturer and are designed for specific models or model families, so you need to verify compatibility before purchasing.

Raising the dishwasher improves the look of the kitchen and can also make the unit easier to access. It does not change the dishwasher's interior capacity or wash performance. The goal is to fill the gap while keeping the machine stable and level. If you are at an early stage of kitchen planning, you may want to review standard dishwasher dimensions to see if a different size would avoid the need for a kit altogether.

First step: measure and check clearance

Before buying a kit, measure the distance from the floor to the underside of the countertop. Also measure the height of the dishwasher chassis, excluding the top panel and door. The difference between the two is the maximum height the kit needs to add. Check the depth and width as well, because raising the unit should not cause it to hit the countertop or cabinet when the door swings open.

Look for any obstructions above the dishwasher, such as a countertop overhang or a range top, that could limit how high you can go. The manufacturer's manual usually states the minimum and maximum opening height for that model. If the gap is larger than the kit can handle, a new dishwasher might be a better investment. For guidance on measuring and picking a replacement, see how to measure for a dishwasher and the built-in dishwasher buyer's checklist.

Before installation: gather tools and check connections

You will need a screwdriver or drill, a level, and often a wrench for the water line. Start by turning off power to the dishwasher at the circuit breaker and closing the shutoff valve for the water supply. Unplug the unit if it has a plug, or switch off the dedicated circuit. Then inspect the water supply line and drain hose to see if they have enough slack for the dishwasher to be raised. If they are taut, you may need to disconnect them before lifting.

Also check the anti-tip bracket. This bracket keeps the dishwasher from tipping forward when you pull on the door, and it must be reattached after raising the unit. If your model uses a separate bracket, have the correct hardware ready. For more on electrical and plumbing prep, review the dishwasher electrical connection and dishwasher supply line guides.

Installation steps

Follow these general steps, always referring to the kit's installation sheet for model-specific details. Remove the lower front panel, often called the kick plate, to access the leveling legs. Attach the extension kit brackets to the sides or base of the dishwasher according to the manufacturer's instructions. Raise the dishwasher using the kit's adjustment screws or the existing leveling legs until the unit reaches the desired height. Check that the unit is level side to side and front to back with a bubble level. Slide the dishwasher into its opening, taking care not to pinch the drain hose. Reconnect the water supply line and drain hose, then tighten all connections. Reinstall the kick plate, cutting it if necessary to accommodate the new height. Finally, reattach the anti-tip bracket to the floor or wall per the instructions.

• Turn off power and water before starting.
• Remove the kick plate and keep screws organized.
• Attach the extension brackets securely, following the kit's torque specifications.
• Raise the unit gradually and check levelness frequently.
• Slide the unit into place without forcing it.
• Reconnect lines and verify there is no strain on the hoses.
• Reinstall the kick plate and anti-tip bracket.

Releveling and securing the unit

After raising, confirm the dishwasher is level. An unlevel machine can lead to poor water coverage during washing and water pooling at the bottom. Adjust the leveling legs as needed, and tighten the locknuts to hold the setting. Verify that the door opens and closes without hitting the countertop or cabinet. The door should have a small clearance to avoid scraping the edge of the counter.

The anti-tip bracket is a safety feature, so it must be reattached. If the kit raised the dishwasher beyond the original bracket range, install an extension or a new bracket that fits the raised position. Test the door spring tension: the door should stay open at about 90 degrees and ease closed. For more on leveling and stability, see dishwasher leveling legs and dishwasher anti-tip bracket.

Test the installation and avoid common mistakes

Run a short cycle with no dishes, then check for leaks at the water connection, drain hose, and under the unit. Watch for any vibration or rocking during the wash cycle, which could mean the unit is not level or the anti-tip bracket is loose. Also confirm that the spray arm rotates freely and that the door seal is not compressed by the raised height.

Common mistakes include forgetting to reconnect the anti-tip bracket, leaving the unit out of level, and failing to check that the drain hose is not kinkable after the height change. If the drain hose is now pinched, reposition it to maintain a high loop. If you notice persistent leaks or the unit still does not fit properly, you may want to replace it. See the built-in dishwasher buyers checklist or explore the best built-in dishwashers for models that might fit without modification.

What to pick for your use

Questions

Are dishwasher height extension kits universal?

No. Kits are usually designed for a specific brand, model family, or size class. Always check the manufacturer's compatibility list before buying.

Do I need to disconnect the water and power to install a height kit?

Yes. Turn off power at the breaker and close the water supply valve. Disconnect the water line and drain hose if they are too short to allow the unit to be raised safely.

Can I install a height extension kit myself?

Usually yes, if you have basic tools and can safely lift the dishwasher. The kit often attaches with screws and requires adjusting the leveling legs. If you are not comfortable, hire a professional installer.

How do I know if the kit will raise the dishwasher high enough?

Measure the gap between the top of the dishwasher and the underside of the counter. The kit's maximum height should be at least equal to that gap, but also check that the kit does not overextend the unit beyond the door clearance.

What should I do if the gap is too large for a height kit?

If the gap is more than the kit can handle, or if raising would make the unit unstable, consider replacing the dishwasher with one that has a taller chassis or adjustable feet. Review the built-in dishwasher guides for models that fit your opening.