Electronic assembly manufacturing costs vary wildly—from $500 to $50,000+ per project—depending on complexity, volume, and component sourcing. Understanding what drives these prices helps you budget realistically and avoid overpaying for simple work or underestimating complex builds. This guide breaks down the real pricing factors and helps you know what questions to ask before signing a contract.
What Determines Assembly Costs
Assembly pricing isn't just about labor. The main cost drivers are:
- Bill of Materials (BoM) – components themselves typically represent 40–70% of total project cost
- Setup and tooling – programming pick-and-place machines, creating jigs, or designing fixtures ($500–$3,000+ for small runs)
- Labor hours – assembly technician rates range $25–$60/hour depending on skill and location
- Quality testing – functional testing, AOI (automated optical inspection), or X-ray inspection adds 10–25% overhead
- Volume and complexity – 50-unit runs cost more per unit than 5,000-unit runs; dense PCBs with fine-pitch components cost more to place and solder
Your contract manufacturer (CM) calculates a per-unit cost, then multiplies by quantity. A simple 10-component PCB board might cost $8–$15 per unit in low volumes; a complex medical-grade assembly with 200+ components could run $40–$150+ per unit.
Typical Price Ranges by Project Type
Low-complexity prototype or small batch (under 500 units) $15–$50 per assembly, including basic testing. Expect longer lead times (4–8 weeks) because the CM isn't optimizing for speed on low volume. Useful for proof-of-concept or early customer validation.
Mid-volume production (500–5,000 units) $8–$25 per assembly. Tooling and setup costs spread across more units, bringing per-unit price down. Lead times typically 6–10 weeks depending on component availability.
High-volume manufacturing (5,000+ units) $3–$12 per assembly. CMs can invest in automation, bulk component discounts, and dedicated production lines. Lead times 8–12 weeks or negotiable based on demand forecasting.
Custom or specialized assembly (medical, aerospace, automotive) $25–$150+ per unit. Stricter certifications, traceability requirements, and testing protocols add cost and time.
Hidden Costs to Budget For
Most customers get blindsided by expenses not mentioned in the initial quote:
- Component sourcing fees – 2–5% markup if the CM sources parts (vs. you supplying them)
- Non-standard component premiums – hard-to-find or obsolete parts cost extra and delay projects
- Design for manufacturability (DFM) reviews – $500–$2,000 if your design needs tweaks for assembly viability
- Expedited shipping – shipping a pallet of finished units overnight adds 5–15% to the bill
- Minimum order quantities (MOQs) – many CMs require 100–500 units minimum; below that, expect upcharges
- Test program development – if your product requires custom functional testing, budget $1,000–$5,000 upfront
Ask your CM for a fully itemized quote that separates parts, labor, testing, and logistics.
Questions to Ask Before Comparing Quotes
Getting accurate prices means asking the right things:
- What's your per-unit price at [my specific volume]? (Always specify volume—prices drop dramatically at different tiers)
- What's included in that price? (Assembly only, or testing too?)
- What are your MOQs and lead times at that volume?
- Do you offer consignment inventory, or do I pay upfront for components?
- What happens if a component becomes obsolete or lead times slip?
- Can you do first article inspection (FAI) and provide documentation?
- Are there upcharges for NRE (non-recurring engineering) or design changes mid-production?
Red Flags in Pricing
If a CM's quote seems too cheap, investigate. Prices significantly below market rates often signal:
- Unproven quality or testing shortcuts
- Hidden MOQs or component upcharges revealed later
- Unrealistic lead times (miss them consistently)
- Pressure to pay upfront before seeing samples
Conversely, prices 2–3x higher than comparable quotes warrant scrutiny too—sometimes you're paying for unnecessary certifications or premium services you don't need.
How to Get Reliable Quotes
Compare multiple CMs using a standardized quote request. Include your BoM, target volume, required testing, and timeline. Get at least three quotes before deciding. Platforms like Mercoly let you compare and find trusted contract assembly providers in one place, saving you hours of cold calls and vetting.
Frequently Asked Questions
Q: Should I supply components myself or let the manufacturer source them? Supplying your own components saves 2–5% but requires inventory management and carries lead-time risk; letting the CM source is slower but shifts supply-chain responsibility to them.
Q: What's the difference between SMT and through-hole assembly pricing? SMT (surface mount) assembly is faster and cheaper at volume; through-hole is slower and more expensive but necessary for larger components and legacy designs.
Q: How much should I budget for a prototype run of 100 units? Expect $25–$60 per unit for a mid-complexity board, plus 4–8 week lead time; prototype runs carry high per-unit costs due to setup fees spreading thinly.
Compare quotes from multiple manufacturers today to lock in fair pricing for your next project.