Short answer
A built-in grill sits in an opening in the cabinet top and is supported at its flange; a drop-in grill drops into a hole in a worktop with no cabinet support beneath. An undercounter grill cabinet takes a built-in. A drop-in belongs in a counter with a base under it.
The words mean different things
A built-in grill is designed to be inserted into a masonry or cabinet structure. Its chassis is carried by a flange that bears on the top edge of the opening, and the cabinet provides the enclosure and the support below.
A drop-in grill is a worktop appliance. It drops into a rectangular hole in a counter and is carried at the rim, with the body hanging beneath. It does not need a cabinet enclosure, only clear space and a heat shield.
Both have a cut-out. Only one of them expects a box around it.
Why this matters at the ordering stage
A grill cabinet is built as an enclosure: sides, base, vented fascia, and a top aperture cut to your drawing. That is the built-in pattern. A drop-in grill in an undercounter opening has nowhere for its body to hang and no flange to bear on.
The practical test is the installation manual. If the drawing shows the unit sitting inside a vertical enclosure with a vented front, it is built-in. If it shows a rim resting on a worktop with an open void beneath, it is drop-in.
What a drop-in does need
A drop-in grill on an open base with a stainless surround is a perfectly good arrangement — it is what most charcoal and portable units use. What it must not have is a sealed cabinet behind it. Radiant heat needs an escape path, and a closed box with a heat source inside it is the worst of both options.
If you are set on a drop-in, tell us before we cut. The cabinet can be built without a top aperture and with a different vent pattern, so the grill sits on the counter and the box below stays open at the front.
The one number that settles it
Lid clearance. A built-in grill's lid opens up and back inside its own footprint. A drop-in on a worktop opens above the counter, which changes the height you need under a pergola or a wall window.
If the clearance works for one it usually works for both, but the drop-in needs the extra height above the counter rather than inside the structure.
The comparison, in one table
| Built-in | Drop-in | |
|---|---|---|
| How it sits | Drops into an aperture and is carried by a flange around it | Drops into an aperture and hangs on its own rim |
| Aperture needed | Cut to the appliance drawing, including the flange width | Cut to the appliance drawing, minus the rim overlap |
| Fascia below the counter | Visible, so it is finished and vented | Usually hidden inside the closed bay |
| Service access | From the front, through the module door | From above, so the grill must come out first |
| Typical cabinet | HW-03, 1,182 × 643 × 900 mm | Any module with a deep enough bay |
Questions we get about this
Can I put a drop-in grill in a grill cabinet?
Not in the built-in opening, but yes if the cabinet is built without a top aperture and with an open or louvred front. Send the manual drawing; the difference is visible in the section view, and we build to whichever pattern your appliance expects.
Do both types need ventilation?
Yes. Any heat source inside an enclosure needs a path for heat to leave and for gas to escape downward. The built-in pattern vents the fascia; a drop-in on an open base vents through the open front.
What if the manual does not say which type it is?
Photograph the section drawing on the installation page and send it. Nine times out of ten it answers the question in one image.
Before you order anything
Send the grill model and the run length. You get the aperture, the module list and one itemised price back in writing — freight shown separately, valid 15 days.