What does a factory audit in China actually check?

A factory audit typically covers: legal registration and business license verification, production capacity and equipment assessment, workforce size and skills, quality management system (documented procedures, inspection records), existing customer references, financial stability indicators, health and safety compliance, and product-specific capability evaluation. For electronics, a technical audit also reviews engineering team qualifications, component sourcing practices, and test equipment calibration records. The audit produces a written report with findings and a pass/fail or scoring against defined criteria.

How long does a Chinese factory audit take and what does it cost?

A standard factory audit takes one full working day on-site for a factory under 200 employees. Larger factories or audits with extensive technical scope may take 1.5–2 days. Third-party audit firms charge $300–600 per man-day in Shenzhen and Guangdong. Sourcing agents often include audit in their first-engagement fee. Travel costs from the auditor's base to the factory are usually billed separately. The total cost for a standard single-day audit with report is typically $400–800.

Can I conduct a Chinese factory audit remotely without visiting in person?

Remote audits (video call tours, document reviews) became more common during COVID-19 and can provide useful information, but they are not equivalent to an on-site audit. A factory can stage a video tour, use a different facility, or coach workers ahead of time in ways that are much harder to execute during an unannounced or surprise visit. For any first-time supplier or order above $20,000, an on-site audit by a qualified third party is strongly recommended over remote-only verification.

What is the difference between a social audit and a technical factory audit?

A social audit evaluates working conditions, labor practices, environmental compliance, and ethical manufacturing standards — it is what brands like IKEA or H&M require from their suppliers, and it focuses on worker welfare rather than product quality. A technical audit evaluates manufacturing capability, quality management systems, production equipment, and the factory's ability to produce your specific product to specification. For electronics sourcing, technical audits are the primary tool; social audits may also be required if your brand has sustainability commitments or retailer requirements.

What a Factory Audit in China Actually Looks Like

A factory audit isn’t an inspection of your goods. It’s an assessment of whether a factory is capable of making them consistently — and whether the company you’re dealing with is the company they say they are. Those are different questions, and a lot of buyers conflate them.

Here’s what a typical 3-hour audit actually looks like on the ground.

What you’re trying to answer

Before you walk in, it helps to know what questions you’re trying to answer. There are three:

Is this a real factory or a trading company? (Traders often present as manufacturers; you need to see machines, not just a showroom.)
Do they have the capacity and equipment to make your product correctly? (Claimed headcount of 200 and actual headcount of 40 are different situations.)
Do they have quality systems, or are they winging it? (A calibrated QA room is different from one person with a flashlight.)

A good audit answers all three. It does not answer whether your specific order will be made well — that’s what pre-production and pre-shipment inspection is for.

Arrival and document review (30 minutes)

When I walk into a factory for an audit, the first thing I ask for before we go anywhere near the production floor is the document package: business license, ISO certificate if they’ve claimed one, export license, and any quality certifications relevant to your product category (RoHS declaration, UL mark authorization, etc.).

This phase catches more problems than the floor walk. Specifically:

Business license name vs. factory name: The entity on the business license should match the company name on their website, email signature, and contracts. Discrepancies here are either sloppy administration or something to investigate — and you need to know which.
ISO certificate validity: Look at the expiry date and, more importantly, the issuing body. Search the certifying organization. There is a cottage industry in China of issuing bodies that are not accredited by any recognized national accreditation body. A certificate from one of them is decorative.
Capacity claims vs. registered capital: A factory claiming to produce 50,000 units per month with a registered capital of ¥500,000 (roughly $70,000) is mathematically implausible. The numbers should be in the same universe.

Don’t accept documents without reviewing them yourself, and photograph everything. The factory manager will sometimes suggest skipping this step. Don’t.

Production floor walk (60 minutes)

This is the longest part and the most informative. You’re not just looking at machines — you’re reading the factory’s actual operating state.

Headcount: Count heads on the active lines. Not the total of people in the building — the people actually running production. Factories routinely overstate workforce numbers. If they’ve claimed 300 workers and you see 40 on active lines at 10am on a Tuesday, ask where everyone else is. Sometimes there’s a legitimate answer. Sometimes there isn’t.

Machines: Ask them to walk you through the SMT line if you’re sourcing PCB-based products. Do they have a solder paste inspector (SPI) before the reflow oven? An AOI machine after? X-ray capability for BGA or bottom-terminated components? These aren’t nice-to-haves for complex electronics — they’re necessary. A factory without SPI running fine-pitch parts is making process problems invisible until the boards fail.

ESD controls: For electronics, look for wrist strap testers at workstations, ESD floor matting, and ionizing fans near sensitive component handling areas. Absent ESD controls are a latent defect factory — everything may pass visual inspection and fail in the field.

Live orders in production: What you can see on the line tells you what their actual work quality looks like, not just what they show you in the sample room. Look at solder joints, component orientation, label placement, and general workmanship on boards or assemblies currently running. If they’re producing well for another customer right now, that’s a meaningful signal.

Organization and cleanliness: This sounds soft but it’s real. Unlabeled bins, mixed components sitting loose on tables, finished goods stacked without any identification — these are operational discipline problems that show up in your shipment as wrong parts and mixed batches.

QA department (30 minutes)

Does one exist? Not every factory has a genuine QA function. Some have a QA manager title assigned to someone whose actual job is to approve whatever ships.

What a real QA setup looks like: a dedicated inspection area with controlled lighting, calibrated measurement equipment (calipers, multimeters, oscilloscopes for electronics), documented inspection procedures with accept/reject criteria, and calibration records for the equipment. Ask to see the calibration log. If they can’t produce one for any equipment they use, treat that as a flag.

Ask about their defect rate and what they do with failing units. A factory that tracks this — even if the numbers are imperfect — has more maturity than one that says “we don’t have many defects.” Every factory has defects. The question is whether they know where they are.

Engineering interview (30 minutes)

This is where the factory’s actual technical capability becomes visible. I ask specific questions about the product category: how do they handle reflow profile optimization for lead-free paste on a mixed component board? What’s their process for handling components with differing thermal mass? Can they discuss design for manufacturability (DFM) limitations on my specific layout?

A factory with real engineering depth will engage with these questions, ask clarifying questions back, and sometimes push back on your design. A factory with no depth will give vague answers and pivot to their equipment list. The former is the factory you want.

The questions don’t have to be highly technical — but they should require genuine knowledge to answer. “How do you handle first-article inspection for a new product” is a reasonable starting question. The answer should include something about comparing against approved samples, dimensional checks, and sign-off procedures, not just “we check it carefully.”

Closing (30 minutes)

Use this time to probe any inconsistencies from the rest of the audit. If their headcount claim doesn’t match what you saw on the floor, ask directly. If a certificate date is close to expiry, ask whether they’re in the renewal process. Not all inconsistencies indicate problems — some are just administrative lag — but you need to ask.

Take photographs throughout. Not as leverage, but as your record. Factory conditions change between audit and production. Your photos are your baseline.

What an audit can’t tell you

An audit tells you that a factory can make your product. It doesn’t tell you that they will. Quality on the line you walked during the audit may not be the quality on your production run six months later if there’s been staff turnover, a process change, or a cost-cutting decision.

This is not a cynical observation — it’s structural. A factory is a dynamic system, and an audit is a snapshot. That’s why pre-production and pre-shipment inspection exist as separate steps. Audit establishes capability. Inspection verifies execution.

Common red flags

Things that have caused me to downgrade or reject factories during audits:

Factory resists showing the production floor: Sometimes framed as “proprietary processes.” Real factories are proud of their operations. Reluctance here is almost always a headcount or capability gap problem.
ISO certificate from an unrecognized body: Usually easy to verify with a quick search. Non-accredited certificates exist in volume in China and cost very little to obtain.
Claimed capacity doesn’t fit physical space: If they say they produce 10,000 units/month and the facility can visually hold maybe 30 workstations, someone is being creative with the numbers.
No QA room or one person handling all QC: For electronics especially, this is a structural problem that good intentions can’t compensate for.
Engineer can’t answer basic product-category questions: The factory may genuinely produce your product category but contract the technical decisions out to a supplier. That’s a supply chain risk you need to understand.

Who should do the audit

You have three options:

You do it yourself: Best if you have the technical background to ask meaningful questions and can speak Mandarin or bring an interpreter you trust. Not feasible for most overseas buyers.

A local sourcing agent does it: Reasonable middle ground — someone who speaks the language, knows what to look for, and can have a candid conversation with the factory manager without the formality of a hired third party. This is what our factory audit service delivers, including a written report with photos — as it did for an EU startup sourcing BLE speakers for their first production run, where the audit was the step that confirmed factory capability before committing to a 5,000-unit order.

A professional inspection firm: (SGS, Bureau Veritas, Intertek, etc.) More formal and more expensive ($500–1,200 per audit), structured around standardized scoring rubrics. Good for regulated industries or when your procurement team needs a recognized third-party certification. Less good for nuanced technical questions specific to your product.

For most electronics sourcing at the scale of $10k–$100k orders, the sourcing-agent approach hits the right balance of depth and cost. Our full factory audit checklist covers the complete list of items across all five audit phases.

A factory audit isn’t a guarantee. It’s information. The goal is to walk away knowing more than you knew before — specific, documented, actionable information about who you’re actually dealing with.