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Is LxWxH the correct order?

Yes, for most general purposes. Length x width x height is the standard convention for boxes, packages, furniture, and shipping, where length is the longest horizontal side, width is the shorter horizontal side, and height is the vertical dimension. Shipping carriers, moving companies, and furniture retailers nearly all follow it.

But important exceptions exist. Doors and windows use width x height with no length at all. Screens and images use width x height. Lumber uses thickness x width x length. Rugs and mattresses lead with width. Floor plans use width x length for rooms, with no height, since a plan is a horizontal cross-section. So LxWxH is correct as a default for three-dimensional objects, but not a universal rule, and applying it blindly to doors or room labels causes real errors, like ordering a door that's sized sideways.

On floor plans specifically, if a room label's order is unclear, the drawn walls settle it. A scaled measuring tool like MeasureFloorPlan lets you check each wall's actual length on the plan image, which beats relying on label conventions.