Cost & Quoting

What Drives Cost Per Instrument and How to Build a Quote That Holds

How to build a defensible per-instrument cost stack from material through overhead, and where luthier and OEM quotes routinely lose money.

A defensible instrument cost stack has six lines: tonewood, hardware, machine time, finishing, setup labor, and the reserves and overhead that ride on top. Build them bottom-up per unit, not top-down from a target margin. For a mid-tier bolt-on electric, a rough stack might read tonewood at 22 dollars a usable body after yield loss, hardware at 38 dollars, machine time at 9 dollars, finishing labor and consumables at 30 dollars, and setup at 32 dollars, landing near 131 dollars of direct cost before scrap and overhead. Boutique acoustics run three to five times that on wood alone. The point is to know each line's magnitude so you can defend the total and see which line to attack when margin slips.

Tonewood cost is a yield problem disguised as a material problem. You do not pay for the usable top; you pay for the whole billet and eat the rejects. If a billet yields 60 percent usable master-grade tops, every good top carries the cost of 0.67 rejected tops with it, so a 15 dollar raw cost per top becomes 25 dollars landed. Run the yield first, then divide billet price by usable count, and the real per-unit wood cost appears. Quotes go wrong here when estimators price the target grade at textbook yield of 80 percent when their own checked, runout-prone stock delivers 55 percent, quietly understating wood by roughly a third on every build.

Hardware is your most controllable variable line and the easiest to misquote. The Hardware Kit Cost calculator separates variable spend, kits times per-kit price times in-scope BOM share, from the fixed freight and tooling adder that hits the whole order once. A 100-unit run at 45 dollars a kit and an 80 percent scope share is 3,600 dollars variable, plus a 250 dollar freight and tooling adder, for 3,850 dollars total, or 38.50 per instrument. The classic error is burying freight inside the per-kit price, which corrupts every volume comparison. Keep it separate and a 500-unit reorder shows its true amortization: the 250 dollar adder drops from 2.50 to 0.50 per unit.

Machine and finishing hours become dollars through your loaded rates, not the raw hour counts. Take the 11 spindle hours from a body batch and multiply by a machine rate that carries depreciation, power, tooling wear, and operator attention, often 40 to 90 dollars an hour depending on the router. Do the same for the 11 booth hours from finishing at a booth rate that includes spray consumables, filters, and rack occupancy. Estimators underprice here by using a bare wage instead of a loaded rate: a 22 dollar-an-hour finisher on a fully burdened basis of 55 dollars an hour means every finishing hour you costed at wage was understated by 60 percent before overhead even enters.

Setup labor is the most consistently underpriced line in the entire build. It is skilled hand work that does not share across machines, so the bench hours map directly to a tech's fully loaded rate. At 45 minutes per instrument and a 55 dollar loaded bench rate, that is roughly 41 dollars per unit, and heavier work like a fret level and setup can double it. Shops quote 15 or 20 dollars because they price the wage, forget the retests and second passes covered by the bench allowance, and never add the play-test time. Cost the full scope you actually perform, then apply the allowance, or you will ship the labor for free on every unit.

Two reserve lines protect the quote from tail risk that averages out only over volume. Packaging Damage Reserve applies an expected damage rate against replacement cost per shipped unit: at a 1 to 2 percent freight damage rate and a 120 dollar remedy, you reserve roughly 1.20 to 2.40 per instrument, plus a case-retrofit and claim-handling adder. Scrap and rework ride similarly. If 5 percent of units bounce to the rework bench and each rework consumes an hour of loaded bench time, that is another 2.75 spread across every unit shipped. Leave these out and one damaged freight pallet or a bad finishing week turns a profitable order negative.

Overhead is the line estimators either double-count or forget entirely. Rent, insurance, admin, and unabsorbed capacity are not in your loaded machine and bench rates unless you deliberately built them there, so decide once and be consistent. A common clean method is a burden percentage on direct labor and machine cost, often 20 to 35 percent for a small shop. On our 131 dollar direct example, a 25 percent burden adds 33 dollars, and the reserves add another 5, landing near 169 dollars before margin. Apply your target margin to that fully burdened figure, not to bare direct cost, or the margin evaporates into overhead you forgot to charge for.

For a one-off custom build, roll the whole stack through the Custom Build Quote Cost calculator: variable cost is estimated build hours times a blended shop rate times a scope-capture share, plus a design and setup adder for the non-recurring engineering a bespoke order demands. The scope-capture share is where boutique quotes bleed, because customers add a wood upgrade, two extra finish coats, and specialty hardware after the quote, and none of it gets recaptured. Quote the design adder honestly, hold change orders to a documented rate, and feed real hardware and finishing numbers in rather than round guesses. A custom quote that skips the setup adder and the change-order discipline is a donation, not a sale.

Published 2026-07-01.