Key takeaways
- Furniture BOMs mix units of measure that a generic BOM template often doesn't handle well — board feet or square feet of material alongside hardware counted by the piece.
- The same hardware group (screws, brackets, dowels, finish) repeats across many different pieces — a phantom sub-assembly keeps that grouping organized without creating a stocked "kit" item that doesn't physically exist.
- Cost rollup needs to account for material waste from cutting (kerf loss, defects, offcuts) on top of the raw board-foot or sheet cost.
Why furniture BOMs mix units of measure
A furniture piece's BOM typically combines raw material measured in board feet, square feet of sheet goods, or linear feet of trim, with hardware and finish items counted by the piece or by volume (screws, hinges, cans of stain). A BOM system built only around a single unit of measure forces awkward workarounds — treating a partial board foot as a whole unit, for example — that quietly distort both stock levels and cost.
Hardware kits as phantom sub-assemblies
The same group of hardware — a specific set of screws, brackets, and dowels — often repeats across many different furniture pieces unchanged. Modeling that group as a phantom sub-assembly keeps the BOM organized (defining the hardware group once, reusing it across every piece that needs it) without creating a "hardware kit" item that is never actually stocked or built on its own — the individual screws and brackets still deduct directly from raw stock.
- Raw material (lumber, sheet goods) tracked by board foot, square foot, or linear foot
- Hardware and finish tracked by piece or volume
- Repeated hardware groupings modeled as phantom sub-assemblies rather than duplicated across every piece's BOM
Accounting for cutting waste in cost rollup
Raw material cost for a finished piece is rarely just the material actually visible in the final product — kerf loss from cutting, grain-matching offcuts, and defect trim all consume material that never makes it into the piece. A scrap or waste percentage applied on top of the base material cost keeps the rolled-up finished-piece cost realistic instead of understating true material spend.
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