How to Choose a Small Dishwasher for Under a Sink

On this page (6 sections)

1. Can a small dishwasher fit under a sink?
2. How should you measure the sink cabinet?
3. Which sink and plumbing details can block installation?
4. Should you choose a countertop or built-in model?
5. What if you want a dishwasher built into the kitchen?
6. What should you check before choosing a small dishwasher under the sink?

A small dishwasher usually cannot sit beneath a sink while the sink bowl and plumbing occupy the cabinet. For space-saving options in a tiny home, see dishwashers for tiny houses.

Measure the clear space beside or below the bowl, check hose routing and access, and compare those measurements with the dishwasher's full dimensions.

For many kitchens, a countertop unit placed beside the sink is more practical than trying to fit an appliance inside the sink cabinet. Browse our best dishwashers for small spaces for other layouts that may suit a tight kitchen.

Can a small dishwasher fit under a sink?

A small dishwasher can fit under a sink only when the cabinet has enough unobstructed space for the appliance and its required connections. The sink bowl, drain, water lines, disposal and cabinet frame can take up most of the space.

Start by measuring the cabinet opening, then map the bowl and plumbing below it. Measure the remaining clear space at the narrowest points, not just the cabinet's outside width and height.

A freestanding countertop dishwasher is built for a counter, so don't assume it can run safely inside a closed cabinet. Check the model's placement instructions for ventilation and clearance requirements before considering an enclosed spot.

If the sink cabinet is too crowded, measure nearby counter space or an open shelf. A portable unit may sit beside the sink and use a faucet connection or built-in water tank, depending on the model.

How should you measure the sink cabinet?

Measure the usable opening and the obstructions before comparing dishwasher dimensions. Record width, depth and height, including the lowest point of the sink bowl and any pipes that cross the space.

Use this checklist:

1. Measure the cabinet opening between the side walls and beneath the countertop.
2. Measure from the cabinet floor to the lowest point of the sink bowl.
3. Mark the drain, disposal, shutoff valves and water lines.
4. Measure the remaining depth from the cabinet doors to the back wall.
5. Check whether the doors, hinges or center stile reduce the opening.
6. Leave room to reach shutoff valves and remove or service plumbing parts.

A paper or cardboard outline can help show whether the appliance will clear the bowl and pipes. Include space for the door to open and for hoses to bend without being pinched.

Compare your measurements with the appliance's outside dimensions. Our guide to small dishwasher dimensions explains how to compare width, depth and height with the space you have.

Which sink and plumbing details can block installation?

The sink bowl and its plumbing often determine whether an under-sink installation is possible. A deep bowl, disposal or drain assembly can leave too little height or depth, even when the cabinet looks spacious from the front.

Check where the drain exits and how the supply lines run. Hoses should have a practical route that avoids sharp bends, crushing and interference with cabinet doors or stored items.

Don't block the sink shutoff valves or plumbing access with an appliance. If a proposed setup would require moving plumbing, ask a qualified plumber to assess the cabinet and connections before buying.

Drain routing also matters for countertop models set near a sink. Read our guide on whether a countertop dishwasher can drain into a sink for the setup considerations.

Should you choose a countertop or built-in model?

Choose a countertop model when you need a compact unit near the sink and can spare counter or shelf space. An under-sink cabinet is only a workable location if the exact unit's placement rules, clearance and connections suit that enclosure.

These countertop options have different dimensions and water-supply approaches:

NOVETE Portable Countertop Dishwasher

The NOVETE measures 16.9 in wide, 16.8 in deep and 18.1 in high. It has a built-in 5 L water tank and can also connect to a faucet, so you can compare both supply options with your kitchen setup.

The stated dimensions describe a countertop appliance, not an under-sink installation. Measure the counter or shelf and check the clearance above it before deciding where it will go.

COMFEE' Portable Mini Dishwasher

The COMFEE' mini model measures 16.53 in wide, 17.13 in deep and 17.24 in high. It has a 5 L built-in tank and can also connect to a kitchen faucet using the included hose and adapter.

The manufacturer specifies more than 19.6 in between the countertop and wall cupboard for placement. Check that vertical clearance if you plan to use it on a counter beneath upper cabinets.

COMFEE' Countertop Dishwasher

The COMFEE' countertop model measures 21.7 in wide, 19.7 in deep and 17.2 in high. It can connect to a faucet with a suitable adapter and is described as suitable for countertop or cupboard placement.

Its width and depth are larger than the other two examples, so measure the full footprint and hose route. Confirm the placement instructions before enclosing a countertop appliance.

What if you want a dishwasher built into the kitchen?

A built-in dishwasher needs a planned cabinet opening and water, drain and electrical connections. If you want a permanent installation, compare models designed for that use instead of adapting a countertop appliance to fit under a sink.

An 18-inch built-in may be an option where you have a narrow dishwasher bay. See our best 18 inch dishwasher guide, and compare drawer-style layouts in single drawer dishwashers.

Measure the opening and confirm the installation requirements for the specific model. The nominal appliance width alone doesn't account for the required opening, adjacent cabinet structure or connection access.

What should you check before choosing a small dishwasher under the sink?

Before choosing a small dishwasher under a sink, confirm physical fit, placement suitability and water and drain access. These checks help you decide whether the cabinet can hold an appliance or whether a nearby counter is the better location.

• Measure clear width, depth and height around the bowl and plumbing.
• Compare the measurements with the appliance's full outside dimensions.
• Check its placement instructions, including ventilation and clearance.
• Plan a route for its water supply and drain hose.
• Keep plumbing shutoffs accessible.
• Confirm the door can open and the appliance can be reached for filling or care.

Choose an under-sink location only if the appliance instructions support that placement and the cabinet leaves enough working room. Otherwise, consider a countertop model near the faucet or a built-in model made for a dishwasher bay.

For an under-sink setup, pick a unit only after the bowl, plumbing and clearance all check out. If they don't, compare a nearby countertop location or a purpose-built compact installation through our countertop dishwasher guide.

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Frequently asked questions

Can a small dishwasher fit under a kitchen sink?

It may fit only if the cabinet has enough clear space after accounting for the sink bowl, drain, supply lines and any disposal. Measure the usable opening and the appliance, then confirm that hoses can reach their connections without kinks and that you can still access shutoff valves and plumbing.

Can I put a countertop dishwasher inside a sink cabinet?

A countertop dishwasher may physically fit in some cabinets, but its size alone does not confirm that placement is suitable. Check the manual for placement and clearance rules, allow room for ventilation and door access, and plan safe water and drain connections before using it inside a cabinet.

Do countertop dishwashers need a permanent water hookup?

Some countertop models offer a built-in water tank as well as faucet connection, while others connect to a faucet. Check the exact model's instructions and leave a practical route for filling or connecting water, plus its drain hose, before choosing a cabinet location.

What should I measure before choosing a dishwasher for under a sink?

Measure the cabinet opening, the clear space around the bowl, and the locations of the drain, supply lines and disposal. Compare these with the appliance's width, depth and height, then account for hose bends, ventilation, door opening and access to plumbing shutoffs.