Direct answer: Structural design fees in China's industrial design market typically run from 10,000 to 100,000 RMB, layered by part complexity: 10,000-25,000 RMB for five parts or fewer, 25,000-50,000 RMB for 5-15 parts, 50,000-80,000 RMB for 15-30 parts, and 80,000-150,000 RMB for 30+ parts with transmission or sealing structures. There are three pricing models: fixed project price, hourly rate (1,200-3,000 RMB per person-day), and a 1%-5% royalty on product sales price.
How Much Does Structural Design Usually Cost? Start With a Benchmark Range
Conclusion: Quotes for small and mid-sized consumer products cluster between 15,000 and 50,000 RMB. That range covers the majority of plastic-housing-plus-internal-bracket structural design work on the market. If you are searching for "how structural design fees are calculated" or "structural design quotation standards," use that number as your anchor, then see which tier your own part count falls into.
Breaking down real quotations into three tiers: the first is simple structure — a single plastic housing, five parts or fewer, common in night lights, humidifiers, and Bluetooth speakers. Structural design fee: 10,000-25,000 RMB, design cycle 5-10 working days. The second tier is medium complexity, 10-30 parts including plastic parts, sheet metal, screw bosses, and snap-fit assemblies: 25,000-50,000 RMB, cycle 15-25 days. The third tier is complex electromechanical products, 30+ parts with transmission, sealing, heat dissipation, and waterproofing requirements: 50,000-100,000 RMB or more, cycle 30-60 days. This is also the point most clients miss when they ask about "structural design pricing standards": the price difference is not in the designer's hourly rate, it is in the product's part count and the number of validation rounds.
Direct answer: Structural design fees are not charged as a percentage of product sale price. They are priced on three dimensions: part count, structural complexity, and validation rounds. For the same exterior, doubling the internal part count typically raises the structural design fee by 60%-120%.
Project-Based, Hourly, or Royalty: Which Pricing Model Should You Choose?
Conclusion: If requirements are frozen and the drawing scope is clear, choose a fixed project price. If requirements are still moving and the design must be adjusted as you go, choose hourly. If mass-production volume is predictable and you want to reduce upfront cash outlay, you can negotiate a royalty on sales price. Choosing the wrong model loses more money than the price level itself.
Project-based pricing is the most common approach: the client gets a fixed price plus a deliverables list. The advantage is a predictable total that is easy to push through procurement. The risk is that requirement changes are billed separately — the industry convention is that going beyond the original scope by more than 20% triggers a change order, and revising a structural design once typically adds 2,000-8,000 RMB. Best suited to clients whose product definition is clear and whose exterior is already finalized.
Hourly pricing: the industry rate for a structural design engineer is 150-400 RMB per hour, roughly 1,200-3,000 RMB per person-day, with senior engineers typically at 2,000-2,500 RMB per person-day. The advantage is that neither side loses: you pay for exactly the time spent. The risk is that the total is uncontrollable — if the project drags on for three months, the fee can roll from 30,000 to 80,000 RMB. Best suited to R&D-heavy projects, non-standard equipment, and teams whose requirements are still iterating.
Royalty on sales price: the common ratio is 1%-5%, and it can be tiered — 5% under 10,000 units shipped annually, dropping to 1%-2% above 50,000 units. The advantage is low upfront cash pressure, aligning the design firm with sales performance. The risk is that sales and financial data are opaque; if the client sells well but cannot clearly account for it, the design firm has little way to verify. This model suits partnerships with an existing trust base, a mature category, and a clear path to mass production.
Where the Money Actually Goes in a 10,000-100,000 RMB Structural Design Fee
Conclusion: The composition is roughly 30% concept design, 35% detailed 3D modeling, 20% prototype assembly validation, and 15% mold follow-up and trial-mold revisions. A 50,000 RMB structural design fee typically means 15,000 RMB for concept development, 17,500 RMB for modeling and drawings, 10,000 RMB for prototype validation, and 7,500 RMB for mold follow-up.
Many clients assume structural design is just "drawing a 3D model." What actually consumes the hours is the last three blocks. Concept design fixes the part-splitting logic, snap-fit form, assembly sequence, and ejection direction — this step decides whether the product can be manufactured smoothly, and it carries the highest rework cost. Detailed 3D modeling delivers complete part drawings, exploded views, a BOM, and 2D engineering drawings; this determines whether the mold shop can actually cut the tool from your files. Prototype validation usually means one or two rounds of prototypes, with outsourced prototype cost of 3,000-15,000 RMB per round depending on part count and process. Mold follow-up covers T1 and T2 trial-mold support and revision recommendations; changing a steel mold structure once typically costs 2,000-8,000 RMB.
Direct answer: A structural design cycle typically runs 5-60 working days. A simple single-shell part takes 5-10 days, medium complexity 15-25 days, and complex products with transmission or sealing structures 30-60 days. Rush jobs can compress the schedule by around 30%, but quotes usually rise 20%-40%.
What Pushes the Price Up — and What Can Bring It Down
Conclusion: Five factors drive pricing, in order of weight: part count, moving mechanisms, ingress protection rating, revision count, and delivery schedule. For the same exterior, a product with waterproof structure typically costs 30%-50% more, and one with gears or linkage transmission costs 40%-80% more.
In real quotations from Dongguan product design firms, a few points are commonly underestimated. First, IP waterproof rating: reaching IPX7 requires designing seal grooves, ultrasonic energy directors, or dispensing paths, and that doubles the validation rounds. Second, drop test requirements: a 1.5-meter six-face drop forces thicker walls and revised ribs, pushing both mold and material costs up. Third, safety and certification: products seeking CCC, CE, or UL certification must reserve creepage distance and flame-retardant structure. Fourth, revision count: every time a client's internal review changes the exterior or functional definition, the structure basically has to be redone for a full round.
The room to reduce cost sits in the same places. Starting structural design after the exterior is finalized saves 15%-25% of rework. Reducing part count is the most cost-effective saving of all — every 3-5 parts removed typically cuts the structural design fee by about 10%. Writing safety and test standards into the design input up front avoids a second round of mold changes. And allowing a schedule of 30 days or more usually earns a quote about 20% lower than a rush job.
FAQ: Common Questions About Structural Design Fees
Q: How much does structural design generally cost?
A: A simple single-shell part runs 10,000-25,000 RMB, medium complexity 25,000-50,000 RMB, and products with transmission or sealing structures 50,000-100,000 RMB.
The quote depends mainly on part count, structural complexity, and validation rounds — not on where the designer is located. The reason quotes are lower in Dongguan for the same product is usually a mature supply chain and cheaper prototype and mold revision costs.
Q: Is project-based or hourly pricing more cost-effective?
A: If requirements are frozen, choose project-based pricing — typically 10%-20% cheaper than hourly. If requirements are undecided, choose hourly to avoid disputes over changes.
With hourly pricing, agree on a person-day cap, for example no more than 30 person-days, with anything beyond that requiring written confirmation from both sides. That keeps the risk bounded.
Q: How long does structural design take, and can it be expedited?
A: Simple parts take 5-10 working days, medium complexity 15-25 days, and complex products 30-60 days. Rush jobs can compress the timeline by about 30%, with quotes 20%-40% higher.
Expediting relies on parallel workstreams and extra staffing, but outsourced prototyping and trial-mold scheduling depend on suppliers, so not every step can be compressed.
Q: Does the structural design fee include prototyping and mold costs?
A: No. Outsourced prototypes cost 3,000-15,000 RMB per round, and mold costs are separate. The structural design fee covers drawings and mold follow-up service only.
Before signing, always confirm the quotation boundary: does it include 2D engineering drawings, a BOM, how many revision rounds, and how many mold follow-up visits. Those are where the extra charges pile up later.
Q: Can I pay the structural design fee as a royalty on product sales?
A: Yes. The common ratio is 1%-5%, and tiered royalties work too. It suits long-term partnerships with predictable mass-production volume and a solid trust base.
For a royalty model, agree on the settlement basis up front: factory price or retail price, units shipped or cash collected, and how often settlement happens. An unclear basis is the most common source of disputes.
Originally published on the Hezi Industrial Design website (hezidesign.com), Company/Service column.
