How to measure for a built-in oven

A built-in oven does not really have a size. It has a hole it must drop into, and that hole was cut by someone else, probably years ago, to suit a different oven. Everything else on the spec sheet is a preference. The aperture is not.

This takes about five minutes with a tape measure and saves the conversation nobody enjoys having on delivery day.

Three sets of numbers, and only one of them is the hole

Every oven we list carries three separate dimension sets, and they are not interchangeable. Take the Bosch HBF512BB1H as a worked example:

• Cutout: 560 mm wide, 575 mm high, 550 mm deep. This is the opening in the cabinetry.
• Product: 594 mm wide, 595 mm high, 548 mm deep. This is the oven itself.
• Carton: 665 x 670 x 685 mm. This is the box that has to get through your front door.

Notice the oven is 34 mm wider than its own hole. That is deliberate. The trim overlaps the cabinet face so you never see the cut edge. People who measure the oven and cut to that number end up with an aperture the oven falls straight through.

Width is the easy part. Height is where it goes wrong.

Across the 60 cm built-in ovens in our range, cutout width is 560 mm on almost every model. Two Fujioh ovens, the FV-EL61 and FV-EL63, ask for 562 mm instead.

Height is a different story. There is no single standard, and the spread is wide enough to matter:

• Bosch Series 2 ovens (HBF and HHF codes): 575 mm
• Bosch Series 4, 6 and 8: 585 mm
• Fujioh FV-EL61, FV-EL62, FV-EL63 and FV-ML75: 590 mm
• Electrolux KOCAP3XH: 590 mm. The KOIGH00KA2 wants 600 mm

That is a 25 mm range inside a category everyone calls standard. If your existing opening was cut for a Bosch Series 2 at 575 mm and you have your eye on a Series 8, you need 10 mm more height than you currently have. A carpenter can usually take that off the shelf above. It is a much better thing to know in advance than to discover with an oven sitting in your hallway.

Depth is steadier. Most sit at 550 mm. The Fujioh FV-EL61 and FV-EL63 want 570 mm, and the FV-ML75 wants 560 mm.

Compact ovens use a completely different opening

The 60 x 45 cm compact ovens, steamers and combi units need a separate aperture: 560 mm wide, 450 mm high, 550 mm deep. That covers the Bosch CSG7584B1 steam oven, the CMG7241B1 and CMG7361B1B microwave combis, the CDG714XB1 steamer and the Fujioh FV-AL81.

A compact oven will not fill a full-height opening, and a full-height oven will not go into a compact one. If you are stacking a compact unit above a full-size oven, you are planning two apertures, not one tall one. The microwaves and combi ovens range is where those live.

What to actually measure

1. Width, twice. Across the inside of the aperture at the top, then again at the bottom. Cabinet carcasses rack over time and a 3 mm difference is common.
2. Height, twice. Left side and right side, for the same reason.
3. Depth. From the front edge of the cabinet to whatever is behind it. Water pipes, a socket box or a skirting return all steal depth, and depth is the measurement people forget.
4. The power supply. Where it is, and whether it is a socket or a hardwired connection point.
5. Door swing. An oven door drops forward roughly its own height. Check nothing in the walkway stops it opening fully, particularly in a galley kitchen.

Write the five numbers down. If your opening is close to a listed cutout but not exact, the cabinet is the thing that gets adjusted, never the oven.

Power is a fit question too

This is the one that surprises people upgrading within the same brand. Three real examples from our range:

• Bosch HBF134EB1K: 2300 W, supplied with a plug, 13 A fuse. Plugs into a socket.
• Bosch HBF512BB1H: 2850 W, no plug supplied, 13 A fuse. Hardwired connection.
• Bosch HSG938EB1 and HBG7764B1B: 3600 W, 16 A fuse.

A 3600 W oven on a 16 A fuse sits above what a standard 13 A socket outlet is rated to carry. It needs its own supply, and in Singapore that means a licensed electrician doing the work before the oven arrives rather than on the same afternoon. Fujioh states 15 A across its built-in oven range for the same reason.

Moving from an entry-level oven to a steam or pyrolytic model is often an electrical job as much as an appliance swap. Budget for it.

Then check the box fits through the door

The carton is bigger than the oven by a fair margin. The HBF512BB1H ships in 665 x 670 x 685 mm and the HUA736ER0K in 650 x 665 x 680 mm. That is usually fine through an HDB main door, though tight corridors, a turn at the lift lobby or a walk-up flat are worth a second look. Carton dimensions are listed on every product page for exactly this reason.

Once you have your numbers

If your aperture is 560 mm wide, start with the 60 cm built-in ovens and work down by cutout height. If you are still planning the cabinetry and can cut to suit, the full built-in ovens range is open to you, including the taller Electrolux models.

Bosch publishes cutout, product and carton dimensions on every built-in model, which makes it the easiest range to check against a fixed opening. Fujioh publishes cutouts on its ovens too. Some ranges do not publish them at all, and we say so on the product page rather than guessing on your behalf.

Once it is in the wall

Three recipes written for these ovens, if you want to see what the aperture is buying you: sio bak with proper crackling, Teochew steamed seabass in a steam oven, and double-boiled chicken soup.

Common questions