Stock, Semi-Custom, or Custom
Part of the kitchen cabinets guide. What the three tiers actually mean, and where the money goes.
The short answer: Tier buys fit and lead time, not durability. Stock ships in days to weeks on a fixed size grid; semi-custom builds to order in four to ten weeks; custom fits any wall in two to five months. Most kitchens belong in semi-custom — but watch the trap: stack enough modification charges and semi-custom passes what plain custom would have cost. If the modification lines exceed about 30 percent of the cabinet subtotal, get a custom bid to compare.
What separates them
The tier describes how a cabinet is ordered and built, not how well it's made.
Stock cabinets are mass-produced to a fixed catalog and sit in a warehouse. You order part numbers. Widths come in 3-inch increments, roughly 9 to 48 inches, and anything that doesn't land on that grid gets covered with a filler strip. Nothing is engineered for your kitchen. They arrive in days to a few weeks.
Semi-custom starts from the same modular sizes but gets built after you order, with a modifications list attached — reduced depth, non-standard heights, finished interiors, glass-ready doors, and hundreds of door and finish combinations. Four to ten weeks is typical. This is where most kitchens land.
Custom is built by a shop to your exact space. No size grid, no filler strips, no limits on species or finish. Two to five months, sometimes longer if the finish is complicated.
RTA — ready-to-assemble — is a fourth option worth knowing about. Flat-packed boxes you build yourself with a mallet and a screwdriver. Quality ranges from junk to genuinely good, and some RTA lines now ship plywood boxes with dovetailed drawers for less than assembled stock. Sizing follows the stock grid with essentially no modifications. The hidden cost is your time: budget 20 to 45 minutes per box the first time, and know that how square you build them determines whether the doors ever line up. Barker Door and CliqStudios are two places to see what's available.
What the tier actually buys you
Fit, and time. That's it.
Stock means filler strips wherever your walls don't match the 3-inch grid. In a galley with a 94-inch run, that gap has to go somewhere. Semi-custom shrinks the problem. Custom eliminates it — and handles the things a grid can't, like a run to a 9-foot ceiling or a cabinet that wraps an odd corner.
What the tier does not determine is how long the cabinets last. A stock line with plywood boxes, dovetailed drawers, and Blum hardware will outlast a custom shop that staples particleboard together. Durability lives in the construction, which is a separate question — how to judge cabinet quality covers it.
The semi-custom trap
Here's the part that catches people.
Semi-custom pricing is a base price plus modification codes, and each modification is an added charge — often 10 to 35 percent of that cabinet's price. In some price books the charges multiply on top of each other rather than simply adding up. A single base cabinet with a plywood upgrade, a reduced depth, upgraded drawer glides, a finished interior, a premium paint with glaze, and a non-standard height can land at nearly two and a half times its catalog price.
A custom shop prices differently: materials, labor, finish. To that shop, your "modification" isn't a modification at all. Building a 22½-inch-deep box costs the same as a 24-inch box. Slightly less, actually.
So there's a crossover point. Once you're stacking three or four modifications across most of the cabinets, plus a premium finish, a semi-custom order commonly meets or beats a plain custom quote for the same kitchen.
The tell is in the quote itself. If the modification line items add up to more than about 30 percent of the cabinet subtotal, get a custom bid to compare. You may still choose semi-custom. Factory finishes are genuinely excellent, and a large manufacturer will still exist in five years when you need a replacement door. But make that trade knowingly rather than by accident.
Lead time is the real scheduling decision
Cabinets are almost always the longest lead item in a kitchen. The tier you pick sets your start date.
| Tier | Typical lead time | Fit to your walls |
|---|---|---|
| Stock / in-stock | Days to 3 weeks | 3-inch grid; filler strips cover the gaps |
| RTA | 1–3 weeks shipping | Stock grid, essentially no modifications |
| Semi-custom | 4–10 weeks | Grid plus a paid modifications list |
| Custom | 2–5 months | Built to the wall; no grid, no fillers |
No one should demolish your kitchen until the cabinets are delivered or a few days out. Starting earlier doesn't finish the job sooner. It just adds weeks of living without a kitchen. The timeline guide covers how this plays out across the whole project.
Which tier fits
Stock makes sense when the layout is simple, the walls are close to standard, the budget is tight, or the schedule is short. Rentals, flips, secondary kitchens, and straightforward footprints.
Semi-custom fits most full kitchen remodels. Lightly modified, it's the best value in the market. Heavily modified, see above.
Custom earns its price on unusual spaces — high ceilings, odd corners, a specific species or finish nobody stocks, or a design where filler strips would be visible and irritating.
What the desert does to a cabinet order
Wood settles to the moisture content of the air around it. The USDA's wood handbook targets 8 percent for interior woodwork across most of the country, and 6 percent in the dry Southwest.
Cabinets are machined and fitted at whatever moisture level the shop that built them lives in — commonly 8 to 12 percent in the Southeast, the Great Lakes, or an overseas factory. Every joint, groove, and panel fit is dialed in at that number. Then they arrive in Phoenix, and every piece of solid wood in them shrinks over the first few months. Panels loosen in their grooves, gaps grow, and joints under tension get tested.
This applies at every tier — stock, semi-custom, and custom alike — so it isn't a reason to choose one over another. What it does change is what you should specify and ask for:
- MDF center panels on any painted door. MDF doesn't move seasonally, which eliminates both the shrink line and the joint cracking. This matters more than where the cabinets were built.
- Every face finished, including the backs of doors and exposed panels. Finishing one side only lets a panel cup.
- A few days of acclimation in the conditioned house before installation — not in the garage, where a Phoenix summer is brutal.
How to judge cabinet quality covers what actually goes wrong and why in more detail.
Next: How to Judge Cabinet Quality
Related: Kitchen Cabinets · Door Styles · The Timeline · Where the Money Goes
Common questions
- What's the difference between stock and semi-custom cabinets?
Stock is pre-built to a catalog and warehoused; semi-custom is built after you order, from the same size grid but with modifications available. Stock ships in days to weeks, semi-custom in four to ten weeks.
- Are custom cabinets worth it?
On unusual spaces, yes — high ceilings, odd corners, or anywhere filler strips would be visible. On a standard rectangular kitchen, a well-specified semi-custom line delivers nearly the same result for less.
- Can semi-custom cost more than custom?
Yes, and it happens regularly. Modifications are priced as adders on top of a base price. Stack three or four across most cabinets plus a premium finish, and you can pass a plain custom quote for the same kitchen.
- How long do custom cabinets take?
Two to five months, longer with complicated finishes. This is usually what determines when demolition can start.
- Are RTA cabinets any good?
The range is wide. Some RTA lines ship plywood boxes with dovetailed drawers and quality hardware for less than assembled stock. The cost is assembly time, and how square you build them decides whether the doors ever align.
- Does the tier affect the warranty?
Not predictably. Some widely sold stock lines carry limited lifetime warranties; small custom shops vary. Ask directly rather than assuming a higher tier means better coverage.