Short answer: there is no single price. A China PCBA quote is assembled from five cost blocks — components (BOM), bare PCB, assembly, test, and one-time NRE — and the BOM alone is usually more than half of it. Two boards of identical size can differ by 10x in price. Any supplier who quotes a number before seeing your Gerber, BOM and pick-and-place file is guessing.
This guide breaks down where the money actually goes, how quantity changes the per-unit math, who pays for what under turnkey versus consignment, and what an itemised quote must contain before you can fairly compare two suppliers.
The Five Cost Blocks of a PCBA Quote
| Cost block | Main drivers | How to reduce it |
|---|---|---|
| Components (BOM) | Part selection, volume tier, market availability | Approved alternates, avoid EOL parts, buy at volume |
| Bare PCB | Layer count, material, size, surface finish, tolerances | Standard materials/finishes, efficient panelization |
| Assembly | Placement count, fine-pitch/BGA work, style="padding:10px 16px;text-align:left;"T share, volume | SMT over style="padding:10px 16px;text-align:left;"T where possible, single-side layouts |
| Test & inspection | AOI/X-ray baseline; ICT or functional test coverage | Design for test; flying probe for small runs |
| NRE (one-time) | Stencils, test fixtures, line setup, DFM engineering | Amortized over volume — hurts small runs most |
Components Usually Dominate
For most assembled boards the BOM is the largest single share of total cost — often well over half once ICs, connectors and power parts are counted. That is why two boards of identical size can differ in price by 10x, and why a serious quote requires your BOM rather than a board photo.
It is also where the biggest savings live. Qualified alternates sourced through authorized distributors and original manufacturers can cut BOM cost substantially without touching your design — our case study on cutting BOM costs without cutting corners shows how that works in practice, always with written client approval before any substitution.
Bare PCB Cost
Board cost scales with layer count, area and material. A standard 2-4 layer FR-4 board is inexpensive at volume; I stack-ups, Rogers high-frequency laminates, heavy copper and tight impedance control all add cost. Efficient panelization — fitting more boards onto each production panel — meaningfully lowers per-unit fabrication cost as quantity rises.
Assembly and Test
Assembly is priced largely per placement, with premiums for fine-pitch BGAs (which require X-ray verification), double-sided reflow and through-hole work. Testing adds cost but protects you from shipping failures: AOI and X-ray are baseline at BELI, with ICT or functional testing quoted to your required coverage.
How Quantity Changes the Per-Unit Price
One-time costs — stencils, test fixtures, machine programming, line setup — are identical whether you build 5 boards or 5,000. Divided across a small run they dominate the invoice; across a production run they nearly vanish. This single mechanic explains most of the confusion about "why was my prototype so expensive per board".
The arithmetic below uses illustrative figures, not BELI pricing, and deliberately holds the per-unit build cost constant so the NRE effect is isolated. Assume one-time costs of 400 currency units and a per-unit build cost of 12:
| Quantity | NRE per unit | Build per unit | Effective unit cost |
|---|---|---|---|
| 5 | 80.00 | 12.00 | 92.00 |
| 50 | 8.00 | 12.00 | 20.00 |
| 500 | 0.80 | 12.00 | 12.80 |
| 5,000 | 0.08 | 12.00 | 12.08 |
In reality the build cost falls as well, because component pricing steps down at distributor volume tiers and setup time is spread over a longer run — so the real curve is steeper than the table shows. The practical takeaway: judge prototype pricing against prototype economics, never against your projected mass-production unit cost. Our prototype vs mass production cost breakdown works through that comparison in detail.
Turnkey or Consignment: Who Pays for What
The engagement model changes both the quoted number and where your risk sits. BELI supports both, with no fixed ratio between them — you can hand off the entire BOM, supply everything yourself, or split the list.
| Turnkey (EMS buys parts) | Consignment (you supply parts) | |
|---|---|---|
| Quoted price | Includes components — looks higher, covers more | Assembly only — not comparable to a turnkey number |
| Shortage risk | Carried by the EMS, who buys across channels | Carried by you; a missing reel stops the line |
| Counterfeit risk | Managed via authorized channels and incoming inspection | Yours — inspection still applies, but sourcing was your call |
| Cash flow | One invoice, later in the cycle | You fund parts up front, often months early |
| Lead time | Typically 2-3 weeks including sourcing | 48-hour quick-turn assembly once parts and boards arrive |
| Best for | Teams without a procurement function | Teams with existing supply contracts or franchised stock |
A frequent and expensive mistake is comparing a turnkey quote from one supplier against a consignment quote from another. They are not the same number.
What an Itemised Quote Should Contain
Two quotes are only comparable if they break out the same lines. Ask every supplier for:
- Bare PCB cost per unit, with layer count, material, finish and panel utilisation stated
- BOM cost per unit, line by line, with manufacturer part numbers and the channel each part comes from
- Assembly cost per unit, with placement count and any fine-pitch or through-hole premiums shown separately
- Test and inspection scope — what is baseline, what is extra, and what coverage the extra buys
- NRE broken out as a one-time line, never folded into the unit price
- Tooling ownership — who keeps the stencils and fixtures you paid for
- Lead time, and what it is measured from (order date, or the date the last component lands)
If a quote arrives as a single number with no breakdown, you cannot tell whether it is cheap because the supplier is efficient or because something has been left out.
Costs Buyers Forget to Budget
| Item | When it hits | Notes |
|---|---|---|
| Tooling and fixtures | First build | Confirm in writing that you own what you paid to develop |
| Freight and insurance | Every shipment | Air freight on an urgent prototype can exceed the board cost |
| Duties and customs | On import | Depends on your destination and declared classification |
| Design revisions | Between builds | New stencil and reprogramming if the layout changes |
| EOL part replacement | Mid-production | Requalification, and sometimes a layout change |
| Product certification | Before launch | Performed by accredited labs on your finished product, not by the EMS — see our CE, FCC and UL guide |
Why the Cheapest Quote Often Costs More
Price differences between competent suppliers are usually modest. A quote that is dramatically below the others is normally explained by something that has been removed rather than something that has been optimised. Common causes:
- Test scope reduced to visual inspection only, so failures reach you instead of the factory
- Parts sourced from open-market brokers rather than authorized channels, trading counterfeit risk for margin
- NRE hidden inside the unit price, so the number rises on your second order
- The quote covers assembly only while you assumed it covered components
- No DFM review, so manufacturability problems surface as scrap and rework after the build
The questions worth asking before you commit are collected in key questions to ask before outsourcing PCBA.
Why Shenzhen Remains Cost-Competitive
Shenzhen's advantage is not mainly labour rates — it is supply-chain density. Components, laminates, stencils and tooling are all sourced locally within days, and a one-stop EMS keeps fabrication, sourcing, assembly and test under one roof, removing both the coordination overhead and the margin stacking of a multi-vendor chain. For small teams that also means one point of contact instead of four vendors in a foreign supply chain.
How to Get an Accurate Quote
No honest manufacturer publishes a flat PCBA price list, because the BOM makes every board different. What we can promise is a fast, itemised number: send your Gerber (or ODB++), BOM and pick-and-place file — here is exactly what each file needs to contain — and BELI returns an itemised quotation within 24 hours. We sign an NDA before you share anything, DFM review is included, and there is no MOQ for prototypes.
Request your free PCBA quote and get a real number for your board, not an average.
Common Questions
Can you give me a ballpark before I send files? Only a meaningless one. Without the BOM, the two largest cost blocks — components and placement count — are unknown. Sending three files takes minutes and gets you a real number within 24 hours.
Is there a minimum order quantity? No MOQ for prototypes. A single board can be built on the same lines that run volume production.
Why is my 10-piece prototype so expensive per board? One-time costs are spread across 10 units instead of thousands. See the quantity table above — the per-unit NRE, not the build itself, is what you are reacting to.
Does a cheaper board mean lower quality? Not necessarily, but it should prompt a question about what changed. Compare the itemised lines above before concluding one supplier is simply cheaper than another.
Related reading: PCB Prototype vs Mass Production Cost Breakdown · How We Cut Client BOM Costs Without Cutting Corners · What Files Are Required for PCBA Quotation