A microwave drawer requires a base cabinet matching its width — 24 inches for the Sharp SMD2470ASY or 30 inches for the SMD3070ASY — with precise cutout widths of 22-1/8 inches and 28-7/8 inches respectively.
A microwave drawer saves counter space and looks built-in, but only if the cabinet underneath is the right size. Install the 24-inch model in a cabinet cut to 22-1/8 inches wide, or the 30-inch model in one cut to 28-7/8 inches. Get this wrong and the unit won’t slide in, or you’ll waste money on a drawer that doesn’t fit your kitchen’s layout. Both Sharp drawer models share identical internal cavities — the choice between 24 and 30 inches is purely about your existing cabinet openings. The table below shows the exact numbers you need before cutting anything.
Standard Cabinet Sizes for Microwave Drawers
Microwave drawers from Sharp — the dominant brand in this category — come in two external widths: 24 inches and 30 inches. Your base cabinet must match the unit’s overall width, with a specific cutout width smaller than the cabinet itself.
| Cabinet Width | Cutout Width Required | Sharp Model |
|---|---|---|
| 24 inches | 22-1/8 inches | SMD2470ASY |
| 30 inches | 28-7/8 inches | SMD3070ASY |
Base cabinets typically run in 3-inch width increments from 12 to 60 inches. A 24-inch or 30-inch cabinet is standard in most kitchens, but the cutout opening always measures narrower than the cabinet face — you must cut the opening, not assume the full cabinet width is usable.
Full Cutout Dimensions for the Sharp 24-Inch Drawer
The Sharp SMD2470ASY requires a cutout exactly 22-1/8 inches wide, 15-9/16 inches high, and 23-1/2 inches deep. These numbers come from Sharp’s official installation specs and are non-negotiable for a standard overlap installation.
- Width: 22-1/8 inches (561.98 mm)
- Height: 15-9/16 inches (395.27 mm) — or 14-13/16 inches if using the anti-tip block
- Depth: Minimum 23-1/2 inches (596.90 mm)
If your cabinet is framed, you’ll likely need to trim the stiles down to achieve the 22-1/8-inch opening. The unit’s overall width is about 23.88 inches, so the cutout is roughly 1.75 inches narrower than the cabinet. That gap is covered by the trim kit (SKMD24U0ES for the 24-inch model).
Full Cutout Dimensions for the Sharp 30-Inch Drawer
The Sharp SMD3070ASY uses a cutout width of 28-7/8 inches. Its height and depth match the 24-inch model exactly — 14-13/16 inches high and 23-1/2 inches deep — so if you’re swapping sizes, only the width changes.
- Width: 28-7/8 inches
- Height: 14-13/16 inches (standard with anti-tip block)
- Depth: Minimum 23-1/2 inches
The 30-inch model exists purely to fit standard 30-inch oven cabinets. The internal cavity is identical to the 24-inch version — 17-5/16 inches wide, 7-1/8 inches tall, and 16-9/16 inches deep in both. You get the same cooking space regardless of which external size you pick. The trim kit SKMD30F0AS finishes the installation.
Critical Clearance Requirements for Installation
Cutout dimensions alone won’t guarantee the drawer works. You must also verify three clearance numbers before committing to a location.
- Front clearance: At least 41 inches of open space in front of the drawer so it can extend fully without hitting an island, peninsula, or cabinet door.
- Base cabinet depth: Minimum 24 inches deep — shallower cabinets won’t accommodate the 23-1/2-inch minimum cutout depth.
- Floor support for anti-tip block: The floor or cabinet bottom must support 100 pounds (the unit weighs roughly that). Secure the anti-tip block according to the manual before sliding the unit in.
The One Gap That Catches Everyone
The most common mistake is assuming that because the cabinet is the right width, the unit will slide straight in. The cutout width is always smaller than the cabinet width — about 1.75 inches narrower on the 24-inch model and 1.125 inches narrower on the 30-inch model. If you skip trimming the opening to the exact spec, the drawer housing binds against the cabinet stiles and won’t seat flush. Use Sharp’s installation template (included with the unit) to mark and cut the opening precisely.
Once the cabinet is prepped, electrical requirements are straightforward but non-negotiable: install a dedicated, breaker-protected, 120-volt, 3-prong outlet for the unit. No extension cords. No sharing the circuit with a dishwasher or disposal.
If you’re still deciding between models and want to see how they compare for daily use alongside countertop and over-range options, our roundup of the best cabinet microwaves breaks down features, pricing, and real-world fit for different kitchen layouts.
Price and Model Comparison at a Glance
Sharp dominates the microwave drawer market, and both models share the same internal dimensions, power, and trim kit approach. The table below shows what you’re paying for with each size.
| Model | MSRP / Sale Price (2026) | External Width |
|---|---|---|
| Sharp SMD2470ASY (24-inch) | $1,899.99 / $1,499.99 | 23.88 inches |
| Sharp SMD3070ASY (30-inch) | $2,099.99 (approx.) | 29.88 inches |
Both models deliver 950 watts with 1.2 cubic feet of interior space. The $200-$600 price difference reflects the larger external housing, not more cooking capacity. Buy the 30-inch only if your existing cabinet opening demands it — otherwise the 24-inch saves money and fits standard island and peninsula base cabinets.
Installation Steps in Order
Follow these steps from Sharp’s manual to avoid cutting twice.
- Confirm cabinet compatibility. Ensure the cabinet width matches the drawer size (24 or 30 inches) and that cabinet depth is at least 24 inches.
- Measure the cutout. Use the exact dimensions from the spec sheet for your model. Mark the opening using the included installation template.
- Prepare the cutout. Cut the opening to the marked dimensions. If the cabinet has stiles, trim them to create the full opening width.
- Install the dedicated outlet. A 120V, 3-prong, breaker-protected outlet must be installed in the cabinet space before the unit goes in.
- Secure the anti-tip block. Anchor it to the floor or cabinet bottom where it can support 100 pounds. Slide the unit in and check that the drawer extends fully without obstruction.
When the unit slides flush and the drawer opens without dragging, you’ve got the fit right. For deeper troubleshooting on installation hiccups, Sharp’s dimension guide covers alternative cutout heights for cabinets with anti-tip blocks installed.
Final Fit Checklist
Before ordering or cutting, run through these five checks — every one has tripped up someone during installation.
- Measured actual cabinet width, not the nominal size
- Cutout width matches the spec for your model (22-1/8″ or 28-7/8″)
- Front clearance is 41 inches or more
- Dedicated 120V outlet is installed in the cabinet space
- Trim kit (SKMD24U0ES or SKMD30F0AS) is ordered before the unit arrives
FAQs
Is the 30-inch Sharp drawer bigger inside than the 24-inch?
No. Both the SMD2470ASY and SMD3070ASY share the exact same interior cavity — 17-5/16 inches wide, 7-1/8 inches tall, and 16-9/16 inches deep. The 30-inch model’s larger external box exists only to fill a standard 30-inch oven cabinet opening.
Can I install a microwave drawer in a standard 24-inch base cabinet?
Yes, but only if you cut the opening to 22-1/8 inches wide. A 24-inch cabinet does not provide a 24-inch passage — the stiles and framing reduce the usable space. You must trim the opening to the exact spec from Sharp’s installation template.
What happens if the cutout depth is less than 23-1/2 inches?
The microwave drawer will not seat properly. The unit needs at least 23-1/2 inches of depth from the front of the cabinet to the back wall. Shallower cabinets — common in older kitchens — cannot accommodate a drawer without a complete cabinet swap.
Do I need a trim kit for a microwave drawer installation?
Yes. Sharp requires the SKMD24U0ES trim kit for the 24-inch model and the SKMD30F0AS for the 30-inch model. The trim covers the gap between the unit and the cutout edges, creating a finished, built-in look. Installing without one leaves exposed gaps and voids the fit warranty.
References & Sources
- Sharp. “Microwave Drawer Dimension Guide: Everything You Need to Know.” Official Sharp installation dimensions and clearance requirements.
- Sharp. “SMD2470ASY Product Page.” MSRP, sale price, and full specs for the 24-inch model.