Width guide
Under Sink Organizer for a 30-Inch Cabinet
In a 30-inch under-sink cabinet, size storage to the clear zones, not the label. Subtract 0.5 in for clearance, check the door opening, then map the trap. A centered trap or disposal still splits the space into two side lanes.
30 inches is the most common kitchen sink base in the US, and the size where garbage disposals show up most often. Without a disposal you get generous 9-to-10-inch side lanes; with one, the center is spoken for and layouts look a lot like a 24-inch cabinet split in two.
The best 30-inch layouts commit to zones: a slide-out drawer on the widest clear side, a caddy or bins opposite, a low tray in front of the trap, and a strict keep-clear rule around the disposal and shut-off valves.
Recommended layout
Use the checker result above as the shopping ceiling for this width, then confirm the door opening and the lowest bend before ordering.
Start here: Split the cabinet into left and right lanes of about 10.5 in each. Use organizers that stop short of the trap bend, plus a low bin in the front strip.
Use this page's approach if
shoppers who know the cabinet width but have not mapped the trap yet; the numbers here assume a centered trap, the most restrictive common case.
Skip or adjust it if
your trap sits clearly to one side; open the matching layout page for side-pipe cabinets instead, because your clear zone is much wider.
| Storage zone | Max width | Max depth | Max height | Best use |
|---|---|---|---|---|
| Left zone | 10.5 in | 21.5 in | 18 in | Narrow slide-outs, bin stacks, side baskets |
| Right zone | 10.5 in | 21.5 in | 18 in | Narrow slide-outs, bin stacks, side baskets |
| Front strip | 29.5 in | 10.3 in | 9 in | Low trays and one-motion daily bins |
| Back strip | 29.5 in | 18.5 in | 18 in | Only if every joint stays visible and reachable |
Size classes that match this layout
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| Size class | Shop at or under | Fit | Where it goes | Notes | Link |
|---|---|---|---|---|---|
| Slim side basketvery narrow, 5-6 in lanes | 5.5 in W × 14 in D × 10 in H | Likely fit | Left zone | Rescues the sliver of space beside offset plumbing. plumbing position unknown. Small capacity: best for brushes and refill packs stored upright. | Search this size |
| Stackable binnarrow, 5-7 in lanes | 6 in W × 14 in D × 7 in H | Likely fit | Left zone | Fits the tight lane every other class gives up on; rental-safe. plumbing position unknown. Buy open-front: the lower bin must stay reachable without unstacking. | Search this size |
| Slide-out drawernarrow, for 6.5-8 in lanes | 8 in W × 16 in D × 13 in H | Likely fit | Left zone | Daily-access winner for a clear side lane beside the trap or disposal. plumbing position unknown. Rails need about 0.25 in of side play and a clear travel path front to back. | Search this size |
| Compact two-tier shelfside-lane, 7.5-10 in wide | 8 in W × 15 in D × 14 in H | Likely fit | Left zone | Doubles shelf area in one lane without any mounting. plumbing position unknown. Check lower-tier clearance against your tallest daily bottle. | Search this size |
| Shallow vanity binsmall-format, low vanities | 8 in W × 10 in D × 5 in H | Likely fit | Left zone | Sized for low-bend vanities and 13-15 in door openings. compact class; will not use the full cabinet; plumbing position unknown. Made for vanities; wastes space in a full-depth kitchen base. | Search this size |
| Stackable binstandard, 8-11 in lanes | 9 in W × 13 in D × 8 in H | Likely fit | Left zone | The zero-risk default for any plumbing layout. plumbing position unknown. Stack two high at most; the top bin needs 1 in of lift-out room. | Search this size |
| Slide-out drawerstandard, for 9-11 in lanes | 10 in W × 18 in D × 14 in H | Likely fit | Left zone | Main organizer for the wide lane of an offset-trap kitchen cabinet. plumbing position unknown. Confirm the closed length plus rail hardware fits your usable depth. | Search this size |
| Two-tier slide-outtall, needs a high bend | 10 in W × 18 in D × 17 in H | Likely fit | Left zone | Maximum capacity where the lane is wide and the bend sits high. plumbing position unknown. Total height 17 in: only for bends above about 18 in. | Search this size |
What not to buy here
Anything wider than your door opening as a rigid one-piece box, and any shelf whose legs would stand under the trap bend.
Mistakes this page exists to prevent
- Buying a full-width expandable shelf for a disposal cabinet. Expandables need the center opening to line up with a slim trap, not a disposal body.
- Measuring outside face-to-face instead of inside wall-to-wall; face-frame cabinets lose 2 to 3 inches to the frame.
- Ignoring the hinge hardware: euro hinges bulge 2 to 3 inches into the opening right where a wide box needs to pass.
Common questions
What fits beside a disposal in a 30-inch base?
Plan on 7 to 9 inches of clear width per side. A narrow slide-out or two stacked bins per side is the standard answer; leave the disposal front unobstructed.
Do I subtract anything from the 30-inch label?
Yes. The label is often the outside or nominal size. Measure inside wall to wall, then subtract at least 0.5 in on width and depth as a working margin.
Which measurement kills most purchases at this size?
The clear door opening; it is usually about 4 inches narrower than the cabinet.
Where do these numbers come from?
From the published fit rules on the About page: a 0.5 in safety margin, a trap band estimated from cabinet width, and the door opening as a hard pass-through limit. Your tape measure always wins over the estimate.