How big is a combo wall oven?#
A combo wall oven stacks a full oven and an upper microwave or speed oven in one tall cabinet: nominal widths are 30 or 27 inches, heights run 42 to 46 inches, and depth holds at 24 inches. The table below covers the configurations, and the clearances give the cabinet cutout the stacked pair needs.
Combo wall oven dimensions by configuration#
| Configuration | Nominal width (in) | Height (in) | Depth (in) | Best for |
|---|---|---|---|---|
| 30-inch oven with an upper microwave | 30 | 42–45 | 24 | a single tall cabinet stacking a full oven beneath a built-in microwave |
| 27-inch narrow combo column | 27 | 42–44 | 24 | a slimmer cabinet run in a compact galley kitchen |
| 30-inch oven under a speed oven | 30 | 43–46 | 24 | a convection lower oven paired with a fast speed oven above |
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Installation clearances for a combo wall oven#
- Cutout height: 42–46 in in of tall cabinet opening the stacked pair needs for the lower oven and the upper unit together.
- Cutout width: 28.5 in in of rough width a 30-inch model needs, trimmed a little under the nominal size.
- Cutout depth: 23.5–24 in in of cabinet depth the case and its wiring occupy behind the trim.
- Dedicated circuits: A combo wall oven runs the lower oven and the upper microwave on separate circuits, so leave junction-box access behind the opening.
- Support and weight: A tall stacked unit is heavy, so the cabinet cutout needs a rated support shelf and two people to slide it home.
Will your combo wall oven fit? Clearances and door swing#
A combo wall oven is heavy and tall, so the cabinet cutout does the work. For a 30-inch model you need a rough opening 28.5 inches wide, trimmed a little under the nominal size, and 42 to 46 inches of height to hold the lower oven and the upper unit together. Cutout depth is 23.5 to 24 inches for the case and its wiring behind the trim. Two things trip up a combo install: power and support. The lower oven and the upper microwave run on separate circuits, so leave junction-box access behind the opening for both. And because a stacked unit is genuinely heavy, the cabinet cutout needs a rated support shelf under it, plus two people to slide it home. Confirm the tall cutout height, the two circuits, and the support shelf before ordering.
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Gas ovens involve live gas lines — a loose connection creates explosion and carbon monoxide risk. Electric ovens run on 240V circuits. Our techs are licensed and insured — let them handle the risk.
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Combo wall oven sizes by type: 30-inch oven with an upper microwave, 27-inch narrow combo column, 30-inch oven under a speed oven#
The 30-inch oven with an upper microwave is the mainstream combo, stacking a full oven beneath a built-in microwave in a single tall cabinet 42 to 45 inches high — the everyday layout for a kitchen that wants both without a wall run. The 27-inch narrow combo column fits a slimmer cabinet in a compact galley kitchen, keeping the stacked format at a reduced width and a 42-to-44-inch height. The 30-inch oven under a speed oven pairs a convection lower oven with a fast speed oven above, running a bit taller at 43 to 46 inches for the two full cooking cavities. All three are 24 inches deep and need the same tall cutout and dual circuits, so the choice is width and whether the upper cavity is a microwave or a speed oven. If you cook and reheat constantly, the oven-under-speed-oven pairing earns its extra height, giving two genuine cooking cavities rather than a full oven plus a plain microwave. For most kitchens, though, the 30-inch oven with an upper microwave is the practical default, matching the width of a neighboring wall oven or refrigerator column so the tall cabinets line up cleanly across the run.
Appliance Repair Technician & Diagnostics Specialist · 10 years experience
Electronics and diagnostics specialist with 10 years of experience in modern smart appliance repair, specializing in LG and Samsung.
