One of the biggest secrets of the kitchen remodeling industry is that almost all stock and Ready-to-Assemble (RTA) cabinet manufacturers use a universal nomenclature system for their cabinet SKUs.

Once you understand what codes like B30, SB36, DB24-3, and W3030 mean, you can read any contractor quote or cabinet catalog—and order your cabinets directly online at true wholesale prices without paying a traditional showroom a 40% to 60% markup.

Below is the complete guide to standard kitchen and bathroom cabinet dimensions and SKU codes used across our 21st Century, Jarlin, ProCraft, and Eurocraft collections—plus the 5 critical filler and panel pieces self-service buyers must remember to include.

1. Kitchen Base Cabinets (Standard Height: 34.5" | Standard Depth: 24")

All standard kitchen base cabinets sit on the floor at 34-1/2" high (which becomes the standard 36" countertop height once a 1-1/2" stone countertop is installed) and 24" deep. Because height and depth are always 34.5" × 24", a base cabinet SKU only lists the Width in inches:

Browse all stocked base cabinets here: Shop RTA Base Cabinets →

2. Wall / Upper Cabinets (Width First, Then Height!)

Standard kitchen wall cabinets are 12" deep. Their SKU starts with W followed by two numbers: Width first, then Height:

• W3030: 30" Wide × 30" High (× 12" standard depth) — commonly used for 8-foot ceilings.
• W3036: 30" Wide × 36" High (× 12" standard depth) — great for 8-foot ceilings without a soffit or 9-foot ceilings.
• W3042: 30" Wide × 42" High (× 12" standard depth) — standard choice for 9-foot and 10-foot ceilings.
• W361224 / W361524 / W361824 (Refrigerator Wall Cabinets): When you see six digits after W, the last two digits mean 24" Deep! A W361824 is 36" Wide × 18" High × 24" Deep so it sits flush over a refrigerator between two refrigerator end panels.

Browse all stocked upper cabinets here: Shop RTA Wall Cabinets →

3. Tall Pantry Cabinets & Bathroom Vanities

• Tall Pantry Cabinets (WP / TP / U): Always 24" deep and available in 84", 90", and 96" heights to match the top of 30", 36", or 42" wall cabinets. For example, WP249624 is a 24" Wide × 96" High × 24" Deep Pantry Cabinet. (Shop Tall Pantry Cabinets →)
• Bathroom Vanity Cabinets (VSB / VDB): Bathroom vanities are built at 21" depth (3 inches shallower than kitchen bases for bathroom floor clearance) and 34.5" comfort height. A VSB36 is a 36" Vanity Sink Base. (Shop Bathroom Vanities →)

The 5 “Hidden” Items Self-Service Buyers Often Forget

If you are ordering by SKU yourself (Lane 1: Self-Service), simply ordering cabinet boxes isn’t enough for a finished installation. Make sure your cart includes:

1. Wall & Base Fillers (WF3 / BF3): Any cabinet placed right against a perpendicular wall needs a 1.5" to 3" filler strip so the door and drawers can open past door casing, window trim, and appliances without binding.
2. Dishwasher End Panel (DWP): If a dishwasher sits at the end of a cabinet run without a cabinet on the other side, you need a 24" deep structural Dishwasher End Panel to support the stone countertop above it.
3. Refrigerator Return Panel (REP2496): Gives a built-in look beside your fridge and supports the 24" deep refrigerator wall cabinet (W361824) above it.
4. Toe Kick Boards (TK8) & Scribe Molding (SM8): The recessed kickplate at the floor comes unfinished on the cabinet box—order 96" matching Toe Kick skins (`TK8`) to cover the continuous run, plus Scribe Molding (`SM8`) to hide uneven drywall gaps.
5. 1/4" Skin Panels (Required on ProCraft Exposed Sides): Remember that while 21st Century and Jarlin cabinets come with pre-finished matching sides, ProCraft cabinets come with unfinished birch sides and require a matching 1/4" skin panel on every exposed cabinet end!

Not 100% confident calculating fillers, blind corner clearances, and trim moldings on your own? That is exactly why we offer our professional NKBA Kitchen Design Packages below.