What is the best under-sink trash can for a small cabinet?

A door-mounted bin works best for shallow cabinets because it uses the door's depth. For deeper cabinets, a pull-out frame with a slim bin is more practical. Measure the interior width, depth, and height, and account for the P-trap protrusion before choosing.

How do I measure for an under-sink trash can with a garbage disposal?

Measure the clearance from the lowest point of the disposal to the cabinet floor, and the distance from the front of the disposal to the door. The bin must fit in the space in front of the disposal without blocking access to the unit or the reset button.

Can I install an under-sink trash can if my cabinet has a central mullion?

Yes, but measure the width of each opening separately. A mullion reduces the usable width, so a single wide bin may not fit. Consider two smaller bins, one on each side, or a bin that sits between the mullion and the side wall.

What type of mounting screws should I use for an under-sink trash can?

Use #8 or #10 pan-head screws that are 1 to 1.5 inches long, depending on the cabinet thickness. For particleboard, use toggle bolts or a mounting plate to spread the load. Always drill pilot holes to prevent splitting.

How to Install an Under-Sink Trash Can in a Tight Space

Why Under-Sink Trash Can Installation Needs a Plan

An under-sink trash can frees up floor space and keeps bags out of sight, but it only works if you plan around the plumbing. The P-trap, disposal unit, and supply lines take up the back half of the cabinet, leaving a shallow L-shaped zone near the door. Without measuring first, you risk buying a bin that blocks the disposal or jams the door hinges.

Tight spaces reward a deliberate approach. You are not just picking a container; you are fitting it into a three-dimensional volume that changes every few inches. A pull-out frame or a door-mounted bin can turn dead corner space into a working trash station, but the mounting hardware has to clear the pipes when the drawer slides out.

This guide walks through the full sequence: measuring the cabinet, choosing a bin type, testing the fit, and securing the mount. Each step includes the reasoning so you can adapt it to your specific sink base, whether you have a double sink, a garbage disposal, or a shallow 12-inch-deep cabinet.

Measure the clear interior width, depth, and height of the cabinet, not the outer frame.
Note the plumbing obstruction zone: the back 4–6 inches are usually unusable.
Decide between a door-mounted bin, a pull-out frame, or a freestanding sliding bin based on your cabinet depth.
Always test the bin's height with the door closed and the shelf above clear.

Measure the Cabinet Interior Before You Buy Anything

The most common mistake is measuring the outside of the cabinet door and assuming the interior is the same. Open the door and measure the clear width between the side walls at the front and at the back, because cabinets often narrow near the hinges or the back panel. Do the same for depth, from the front edge to the back wall, and for height from the floor to the underside of the countertop or the bottom of any shelf.

Then map the plumbing. The P-trap and disposal typically extend 4 to 6 inches from the back wall, but the exact protrusion varies. Slide a straight object like a ruler vertically along the back to see how far the pipes stick out, and note the lowest point. That measurement tells you the usable depth of the space in front of the pipes.

Add 1 to 2 inches of clearance on every side of the bin you plan to install. A bin that fits perfectly on paper will still jam if the door hinge swings into the space, or if the bag rim catches on the sink bottom. If the cabinet has a central mullion or a shelf rail, measure around those obstructions too.

Measurement	How to Take It	Why It Matters
Interior width	Between side walls, front and back	Hinges and back panel can reduce usable space
Interior depth	Front edge to back wall	Pipes reduce depth by 4–6 inches
Interior height	Floor to countertop or shelf	Bin must clear the door when open
Plumbing protrusion	Back wall to front of P-trap or disposal	Determines usable depth and bin type

Choose the Right Bin Type for Your Cabinet Shape

Not every under-sink trash can works in every cabinet. A door-mounted bin attaches to the inside of the cabinet door and swings out when you open it, which is ideal for shallow cabinets because it uses the door depth. However, it requires a flat door surface and enough clearance between the door and the front edge of the sink basin when closed.

A pull-out frame with a sliding platform is better for deeper cabinets because it lets you access the bin without reaching past the P-trap. The frame mounts to the cabinet floor or side walls, and the bin sits in a cradle that glides forward. This works well if your cabinet floor is level and you have at least 18 inches of depth in front of the pipes.

For the tightest spaces, a slim freestanding bin on casters or a simple sliding tray can work if you do not need a full-size bin. Measure the width of the gap between the pipes and the side wall; a 6- to 8-inch-wide bin often fits there. Just make sure the bin's height does not exceed the clearance under the sink trap, because a tall bin can press against the pipes and cause a leak over time.

Door-mounted bin: best for shallow cabinets, but check door clearance when closed.
Pull-out frame: best for deep cabinets, requires level floor and 18+ inches of depth.
Freestanding slim bin: best for narrow gaps beside the P-trap, but verify height clearance.
Under-sink bag holder (no bin): uses a frame that holds the bag open, good for very tight spots.

Test the Fit Before You Mount Anything

Dry-fit the bin and its mounting hardware before you drill or screw anything. Place the bin in the cabinet, slide it as far back as it will go, and then open and close the door several times. The door should swing fully without hitting the bin or the bag. If the bin has a lid, open it to make sure it does not hit the underside of the sink basin or the shelf above.

Check the bag situation. A bin that fits perfectly but leaves no room for the bag rim is useless. The bag should drape over the bin's rim and still have enough slack to close the cabinet door. If you use a bag holder, the frame must allow the bag to be removed and replaced without pulling the whole unit out.

Also test the weight. A fully loaded bin can weigh 20 to 30 pounds, so the mounting screws must go into solid wood, not just the thin cabinet panel. If the cabinet is made of particleboard, use toggle bolts or a mounting plate that spreads the load. Shake the bin gently after mounting; any wobble means the hardware is not tight enough.

Secure the Mounting Hardware Without Damaging the Cabinet

When you are ready to mount, mark the screw holes with a pencil, then drill pilot holes that are slightly smaller than the screw diameter. This prevents the cabinet wood from splitting. For door-mounted bins, the screws should go through the door's inner face, so measure the door thickness first; screws that are too long will poke through the exterior.

For a pull-out frame, level the frame side to side and front to back before tightening. Use a carpenter's level on the slide rails. If the cabinet floor is uneven, use thin plastic shims under the frame to level it, then secure with screws through the frame's base into the floor. Do not rely on adhesive strips alone for a heavy bin.

After mounting, test the slide action several times with an empty bin, then with a full bag. The slides should move smoothly without binding. If the bin is wobbly, check the screw tension and the alignment of the cradle. A properly mounted under-sink trash can should stay put when you pull the door open and close it without any rattling.