Factory Audit in China: What It Covers, Checklist, Cost Factors and Red Flags

A factory audit is the single best way to find out whether the supplier on your proforma invoice is the company that will actually build your machine. Websites, Alibaba badges and sales videos are marketing. An audit is evidence: someone stands in the building (or watches a live, unscripted walkthrough), checks documents against reality, and writes down what they found.

This guide is written for buyers of industrial equipment and machinery — packaging lines, CNC machines, filling and capping machines, plastic and food processing equipment — but most of it applies to any custom product made in China. It covers what an audit includes, a usable checklist, the factors that drive cost, how remote and onsite audits differ, and the red flags that should pause a deposit.

If you only want the short version: audit before the deposit, verify identity before capability, and never accept a scheduled tour as proof of capacity.

What a Factory Audit Is (and Is Not)

A factory audit assesses the supplier, not a specific shipment. It answers four questions:

1. Identity — Is this a real, legally registered company at the address it claims, and is it the entity you will pay?
2. Capability — Does it own the equipment, space, people and engineering skills to make your product, or will it subcontract?
3. Control — Does it have working quality processes: incoming inspection, in-process checks, final testing, calibration, traceability and non-conformance handling?
4. Compliance (optional, scope-dependent) — Working conditions, safety and environmental permits, which matter if your customers or market require ethical sourcing evidence.

It is not an inspection of your order. Checking that your machine was built to spec, runs correctly and is packed properly is the job of a factory acceptance test and pre-shipment inspection. Buyers who confuse the two often end up with a great audit report on a supplier who still ships them the wrong configuration.

There are three broad audit types you will see offered:

| Audit type | Main focus | Typical use | | --- | --- | --- | | Supplier verification / factory audit | Legal identity, premises, capacity, basic quality controls | Before first order with a new supplier | | Quality system audit | Depth of QMS: procedures, records, calibration, CAPA, traceability | Ongoing or high-value supplier relationships | | Social / environmental audit | Labour, health and safety, permits, waste | Retail and brand compliance programmes |

For most first-time machinery orders, a supplier verification audit with a solid quality section is the right starting point.

When You Should Audit

• Before the first deposit to any new supplier. This is when you have the most leverage and the most to lose.
• When the order value or customisation is high. A one-off custom line is harder to replace than a stock item.
• When something changes: new legal entity on the invoice, new bank account, new factory address, or a sudden jump in order size.
• When desk research is inconclusive. If our free supplier risk checker or a supplier background check leaves open questions about whether the supplier is a factory or a trader, an audit settles it.

Before you book anything, do the cheap checks first. The guide on how to check if a Chinese supplier is legit walks through license, address and payment checks you can do from your desk in an afternoon.

Factory Audit Checklist

Use the sections below to brief an auditor, or as a structure if you visit yourself. For each point, the question is always the same: what evidence did you see, and does it match what the supplier told you?

1. Legal identity and registration

• Business license (营业执照) shown in original, with the 18-digit Unified Social Credit Code. Cross-check it on the National Enterprise Credit Information Publicity System (gsxt.gov.cn). Our China business license checker validates the code format first.
• Business scope (经营范围) includes production terms such as 生产, 制造 or 加工 for your product category — not only 销售 (sales) or 进出口贸易 (import/export trade). See how to tell a factory from a trading company.
• Registered address matches the audited site, or the supplier can explain and document a separate production address.
• Legal representative and shareholders are consistent with who you have been dealing with.
• The company name on the license matches the name on the proforma invoice, contract and bank beneficiary.
• Export capability: either its own import/export registration or a clearly named export agent.

2. Premises and infrastructure

• Signage, building and gate photographed with timestamps; site location matches the address.
• Owned or leased premises — ask for the lease or property document and note how long it runs.
• Production floor area observed versus claimed.
• Separation of raw material storage, production, assembly, testing and finished goods.
• Power supply and utilities appropriate for the equipment in use (relevant for heavy machining and testing).

3. Production capability

• List of major production equipment with brand, model and approximate condition. For machinery makers, look at CNC machining centres, laser or plasma cutting, press brakes, welding stations and assembly bays.
• Which processes are done in-house and which are outsourced (castings, machining, sheet metal, electrical cabinets, PLC programming, surface treatment).
• Workforce on the floor at the time of the visit compared with what the supplier claims. Note engineers and electricians, not just assembly workers.
• Machines under construction for other customers: are they similar in type and size to yours?
• Engineering capability: who prepares drawings, electrical schematics and PLC/HMI programs? Are they employees on site?

4. Quality management

• ISO 9001 or other certificates: check the certificate number with the issuing certification body, the expiry date, and that the scope covers this site and product.
• Incoming quality control (IQC): how purchased parts — motors, PLCs, pneumatics, stainless steel — are checked, with recent records.
• In-process control (IPQC): inspection points along assembly, welding procedures, torque records.
• Final testing: is there a test area where finished machines are powered and run? What test records exist for recent machines?
• Calibration of measuring tools (callipers, gauges, pressure gauges, multimeters) with valid dates.
• Non-conformance and corrective action records: what happened the last time something failed?
• Traceability: pick a recently finished machine and ask them to show the material certificates or purchase records for one major component.

5. Documentation and after-sales

• Sample of manuals, electrical diagrams and spare parts lists they deliver with machines (and in which language).
• Who supports installation and commissioning, and whether engineers travel abroad or support remotely.
• Spare parts stock and lead times for wear parts.
• Warranty terms in writing, and how warranty claims were handled for previous customers.

6. Commercial and payment safety

• Bank account name on the invoice matches the licensed company exactly. A personal account or an unrelated company is a stop sign.
• Contract terms reflect what was seen: the factory you audited is the factory named as manufacturer.
• Payment structure ties money to milestones you can verify, such as an acceptance test before balance payment. Our supplier deposit risk calculator helps you see how much is at risk at each stage.

7. Social and environmental (if in scope)

• Working hours, wage records and age verification of workers.
• Fire exits, extinguishers and basic machine guarding on the shop floor.
• Environmental permits for processes such as painting, plating or wastewater discharge.

You do not need every line for every supplier. A small supplier of a standard machine may only need sections 1–4 and 6. A custom turnkey line justifies all of them.

What Drives the Cost of a Factory Audit

We deliberately do not quote a single "typical price" here, because the honest answer depends on your supplier. These are the factors that move the cost:

• Man-days. Most of the cost is auditor time on site. A basic verification may fit into one man-day; a deep quality-system audit of a large plant can take more.
• Number of factories. Comparing two or three shortlisted suppliers multiplies days and travel, though it is often the best money spent.
• Location. Factories in major manufacturing clusters near large cities are usually cheaper to reach than plants in remote inland areas, where travel time and costs are added.
• Scope. Adding social compliance, environmental checks or a detailed technical capability review adds time and specialised auditors.
• Urgency. A report needed within 48 hours costs more than one scheduled with normal lead time.
• Report depth and language. Photo-heavy reports with your own checklist, or reports in a language other than English, can add preparation time.

For a planning range based on these variables, use our factory audit cost estimator. It lets you set service type, number of factories, location and urgency. When you are ready to book, ask us for a fixed quote on the factory audit service page.

A useful way to decide whether the audit is worth it: compare its cost to the deposit you are about to send. If your deposit is many times larger than the audit fee, the audit is cheap insurance.

Remote vs Onsite Factory Audits

Remote audits became common when travel to China was restricted, and they remain useful. But they test different things.

What a remote audit does well

• Document verification: license, scope, certificates, export registration and bank details can all be checked without being on site.
• Live video walkthrough: if done properly, it confirms the supplier has access to a real production facility and lets you see machines in progress.
• Engineer interview: a call with the supplier's engineer reveals whether they understand your application.

How to run a remote audit that means something

1. Make it unscheduled. Agree a window, not a time, and call at short notice.
2. Direct the camera. Ask them to walk out of the gate and film the signage, then walk back in without cutting the stream.
3. Ask for specifics. "Show me the nameplate on that machining centre." "Show me today's date on a phone next to the machine." "Open the electrical cabinet on that machine."
4. Check consistency. The facility in the video should match photos on their website, satellite imagery of the address and the license.
5. Record everything and keep screenshots with timestamps.

What a remote audit cannot reliably prove

• Real capacity and utilisation — a camera shows only what the operator points it at.
• Whether the plant you see is theirs, a neighbour's or a subcontractor's.
• Equipment condition, workmanship quality up close, and how organised the floor really is.
• Whether the staff you meet are employees.

Rule of thumb

Use remote for lower-value standard equipment, for an initial screen of several suppliers, or as a follow-up for a supplier you already audited onsite. Use onsite for custom machinery, high-value orders, first orders with a new supplier, and any situation where a remote check left doubts. Many buyers combine them: remote screening for three suppliers, then an onsite audit of the preferred one.

Red Flags During or Before an Audit

These are the findings that should pause your deposit until resolved:

• The supplier refuses an audit or insists on a date weeks away with no reason. Real factories host visitors routinely.
• The audit site does not match the license address, and the supplier cannot document the relationship.
• Business scope has no production activity for your product, while the supplier calls itself a manufacturer.
• Bank beneficiary differs from the contracting company, or a personal account is offered "for a lower fee".
• No machines like yours are being built, and there is no test area where finished machines are run.
• Key processes are outsourced without disclosure — especially electrical cabinets and control programming on automated machines.
• Certificates cannot be verified with the issuing body, or belong to a different company.
• Staff cannot answer basic technical questions about the equipment they claim to build.
• The tour is tightly scripted: certain areas are "closed", photos are forbidden everywhere, or the person guiding you is clearly sales staff only.
• Pressure to pay quickly after the audit is proposed.

For a longer list of pre-audit warning signs on Alibaba listings specifically, see our Alibaba supplier red flags.

How to Use the Audit Report

An audit report is only valuable if it changes your decision or your contract:

• Go / no-go: serious identity or bank mismatches are usually a no-go.
• Negotiate conditions: if outsourcing is disclosed, name the subcontractor in the contract or require their inspection.
• Set acceptance criteria: use what you learned about their test capability to define the factory acceptance test. Our FAT checklist generator builds a starting checklist by machine type.
• Structure payment: tie the balance payment to a passed acceptance test and pre-shipment inspection, not to a date.
• Re-audit trigger: note what would require a repeat visit (new site, new entity, major order increase).

Filling and Packaging Machinery: A Note

If you are buying liquid filling, capping or bottling equipment, add two checks: confirm the supplier can run a real test with your container and a liquid of similar viscosity at the factory, and check which brands of pumps, valves and PLC they actually use versus what the quotation lists. For background on how these machines are specified, iBottling publishes buyer-facing information on filling and bottling lines.

Next Steps

1. Run a free desk check with the supplier risk checker.
2. Estimate audit cost for your situation with the factory audit cost estimator.
3. Book an independent factory audit in China before you pay the deposit — we will quote a fixed fee for your supplier's location and scope.
4. Plan the order-stage checks next: read our guide to pre-shipment inspection for machinery from China.