How do you calculate a custom instrument build quote?

Multiply estimated build hours by your blended shop rate by the billable scope share to get the variable cost, then add a fixed design and setup charge. At 100 hours, $45/hour, 80% capture, and a $250 adder, the quote is $3,850.

What is a blended shop rate?

It is a single hourly rate that averages your different labor stages — rough carpentry, fine finishing, inlay, setup — so you do not have to price each task separately. The example uses $45/hour as the blended rate.

Why use a scope capture share below 100%?

Not every estimated hour bills at full value: some is rework, learning, or goodwill on a bespoke piece. An 80% capture share means you recover 80% of estimated effort, which is realistic for first-of-kind custom work.

What does the quote cost per build hour mean?

It is the total quote divided by estimated hours, giving an effective billing rate. In the example, $3,850 over 100 hours is $38.50 per hour — below the $45 nominal rate because of the 80% capture and how the fixed adder spreads.

Should the design and setup adder be separate from hourly?

Yes — design iteration, jigs, and final setup are fixed effort that does not scale with build size. Breaking out the $250 adder keeps your hourly rate clean and makes the quote easier to defend to a client.

How do I avoid underbidding a custom build?

Estimate hours generously, set a blended rate that covers overhead, and do not push scope capture above what your past custom jobs actually recovered. Then add design and setup on top rather than burying it in the hours.

Musical Instruments & Acoustic Products calculator

Custom Instrument Build Quote Cost Calculator

A custom build quote cost is the price a luthier or acoustic-product shop puts on a one-off or bespoke instrument before committing to the work. Owners and estimators use it to turn a fuzzy build brief into a defensible number that covers bench time, design effort, and setup without underbidding the months of skilled labor that go into a hand-built guitar, harp, or acoustic panel. Because custom work rarely bills every hour at full rate, the scope capture share keeps the quote honest about how much of the estimated effort is actually recoverable. Getting this right protects margin on work that is, by definition, hard to standardize.

What this calculator does

Build a weighted quote for a one-off or short-run custom instrument or acoustic product, covering material, hardware, labor capture, and a design and setup adder.
Use when a luthier or custom shop is quoting a one-off guitar, custom speaker cabinet, or tuned acoustic panel and needs a defensible cost the customer can sign off on.
It computes a total custom build quote from estimated build hours, a blended shop rate, the share of scope that is billable, and a fixed design and setup charge.

Formula used

Variable custom build cost = custom build hours estimated × blended shop rate × scope capture share
Total custom build quote = variable custom build cost + design and setup adder

Inputs explained

Custom build hours estimated:
Blended shop rate:
Scope capture share:
Design and setup adder:

How to use the result

Use it when responding to a custom commission inquiry or sanity-checking a quote before sending it to a client.
It assumes your hour estimate is reasonably accurate — custom builds notoriously overrun, so pad the estimate or carry contingency for discovery and rework.

Common questions

How do you calculate a custom instrument build quote? Multiply estimated build hours by your blended shop rate by the billable scope share to get the variable cost, then add a fixed design and setup charge. At 100 hours, $45/hour, 80% capture, and a $250 adder, the quote is $3,850.
What is a blended shop rate? It is a single hourly rate that averages your different labor stages — rough carpentry, fine finishing, inlay, setup — so you do not have to price each task separately. The example uses $45/hour as the blended rate.
Why use a scope capture share below 100%? Not every estimated hour bills at full value: some is rework, learning, or goodwill on a bespoke piece. An 80% capture share means you recover 80% of estimated effort, which is realistic for first-of-kind custom work.
What does the quote cost per build hour mean? It is the total quote divided by estimated hours, giving an effective billing rate. In the example, $3,850 over 100 hours is $38.50 per hour — below the $45 nominal rate because of the 80% capture and how the fixed adder spreads.
Should the design and setup adder be separate from hourly? Yes — design iteration, jigs, and final setup are fixed effort that does not scale with build size. Breaking out the $250 adder keeps your hourly rate clean and makes the quote easier to defend to a client.

Last reviewed 2026-05-12.