Skipping quality control when importing from China can cost you thousands. This guide covers everything UK businesses need to know: PSI, DPI, factory audits, and how to protect your shipments.
In summary: Quality control (QC) when sourcing from China means verifying that your goods meet your agreed specifications before they leave the factory and are shipped to the UK. The three main inspection types are pre-shipment inspections (PSI), during-production inspections (DPI), and factory audits. You can hire a professional third-party QC agency, use a sourcing agent with on-the-ground presence, or visit factories yourself. Skipping quality control is one of the most expensive mistakes a UK importer can make — the cost of a failed or substandard shipment almost always dwarfs the cost of a proper inspection.
A few years ago, I got a call from a UK fitness brand owner — let's call him James. James had done everything right, or so he thought. He'd found a factory on Alibaba, exchanged dozens of messages, approved a beautiful product sample, and placed his first order for 2,000 units of a resistance band set. He was proud of the deal he'd negotiated — £6 per unit, all-in. Smart business.
The shipment arrived at his UK warehouse six weeks later. He opened the first box and immediately knew something was wrong. The resistance bands were the right colour, but the material felt thin and cheap. The fabric stitching was crooked. The labelling was missing the UK compliance markings he'd specifically requested. A third of the units were essentially unsaleable, and the rest were, at best, a step down from what customers were expecting.
James lost around £12,000 on that shipment — once you factored in the unsellable stock, the reshipping costs, the replacements he had to source urgently, and the refunds to customers who'd placed pre-orders. "I wish someone had told me about quality control before I placed that order," he told me afterwards.
Consider yourself told. In this post, we're breaking down everything you need to know about quality control when sourcing from China — so you never have to make James's mistake.
Quality control (QC) is the process of checking that goods manufactured to your order actually meet your agreed specifications before they're shipped. In the context of sourcing from China, QC typically means sending an inspector — either a professional QC agent or your sourcing agent — to visit the factory and physically check a sample of your goods against your spec sheet, approved samples, and compliance requirements.
QC matters because factories, under commercial cost pressure, sometimes cut corners. It's not always malicious — it can be a simple substitution that the factory doesn't think you'll notice. A slightly cheaper fabric. A thinner component. A packaging material that's close-but-not-quite. Without inspections, you have no way of knowing these things until your shipment arrives in the UK — at which point your leverage over the factory is largely gone.
For UK businesses specifically, QC also carries a compliance dimension. Products sold in Great Britain must meet UK safety standards, carry appropriate UKCA markings where required (or CE for Northern Ireland), and comply with relevant UK regulations — Trading Standards, product liability law, and HMRC import requirements. Factories in China don't automatically produce UK-compliant goods. You need to specify requirements clearly in your purchase order and verify them independently through inspection. Our guide to safety checks before buying on Alibaba covers the compliance basics every UK importer should know before placing a first order.
Sourcing Hack #1: Think of your QC inspection fee as insurance — not an optional extra. A professional pre-shipment inspection in China typically costs £200–£400 for a half-day visit. The cost of a failed shipment — bad goods, customer refunds, regulatory issues, emergency re-sourcing — can run into tens of thousands of pounds. The maths are straightforward. Budget for quality control from day one, built into your COGS. It's not a luxury; it's just good business.
There are three main types of QC inspection used when sourcing from China, each serving a different purpose at a different point in the production cycle. Understanding the differences helps you decide which type — or which combination — is right for your order.
The most commonly used — and the most important one for most UK importers. A PSI takes place after production is at least 80% complete and goods are packaged and ready to ship. An inspector visits the factory, selects a random sample of units, and checks them against your specifications, approved samples, and compliance requirements. You receive a detailed inspection report — usually within 24 hours — with photographs, test results, and a pass or fail recommendation. If the inspection reveals issues, you can negotiate with the factory to fix them before the goods leave China, while you still have leverage. Once your goods are on a ship, your options narrow dramatically.
Also called an in-line inspection, a DPI happens mid-way through production when approximately 20–30% of goods are complete. It's used to catch problems early — before the entire production run is finished with the same defect baked in. DPIs are particularly valuable for large orders where reworking an entire batch would be extremely costly, or for complex multi-component products where assembly errors are difficult to reverse. They cost similar to PSIs but require good scheduling coordination with the factory.
A factory audit is a comprehensive assessment of the manufacturing facility itself — its management systems, production capacity, worker conditions, quality management processes, certifications, and compliance with ethical and legal standards. Audits are typically done before you place your first order with a new supplier, to determine whether the factory is genuinely capable of meeting your requirements. Some UK brands and retailers require factories to hold specific certifications (ISO 9001, BSCI, SMETA, SEDEX) as a condition of doing business. Understanding what a factory can and can't do before you commit your order deposit is a very different conversation to having that realisation after production has begun.
Sourcing Hack #2: For your very first order from a new factory, run both a factory audit (before you place the order) AND a pre-shipment inspection (before goods ship). Yes, it costs more upfront. But it's your first order from an unknown supplier — the audit tells you if the factory is genuinely capable; the PSI confirms they actually delivered to spec. After a successful first order, you can usually scale back to PSI-only for repeat orders from the same factory once trust is established.
You have three practical options for running QC inspections when you're based in the UK and your goods are manufactured in China.
Several international QC agencies operate in China — companies like Bureau Veritas, SGS, Intertek, and QIMA. These are independent inspection firms with large networks of local inspectors across China's main manufacturing hubs. You book online, provide your specifications and approved samples, and receive a professional report. They're reliable, independent, and experienced across many product categories. The main downsides are cost (premium agencies can charge £350–£600 per inspection) and the fact that they don't know your specific factory or your ongoing supplier relationship — every inspection starts from scratch.
If you work with a sourcing agent who has on-the-ground presence in China (such as the Epic Sourcing team), QC is typically built into the service. Your sourcing agent already knows the factory, knows your product specifications inside out, speaks Mandarin, and can resolve issues on the spot without the communication delays and formal processes of a third-party agency. This is generally the most cost-effective and responsive option for UK SMEs — particularly when something goes wrong and you need immediate action. Quality control is a core part of the service we provide under our Private Label and Secret Label packages, meaning you don't need to coordinate separate agencies or pay additional inspection fees.
If you're placing very large orders, working on a complex bespoke product, or want to build a deep long-term relationship with a key supplier, visiting the factory in person is genuinely invaluable. Nothing replaces being in the room — seeing the production line in operation, meeting the factory management team, and checking working conditions firsthand. The practical limitation is obvious: the cost and time commitment of travelling from the UK to China. For most SMEs placing smaller orders, a personal visit isn't cost-effective on every order — but for initial factory vetting or annual supplier reviews, it can be worth every penny and every hour of jet lag.
Sourcing Hack #3: If you're visiting a factory in person, prepare a detailed inspection checklist before you travel. Don't arrive and "have a general look around" — you'll miss things. Your checklist should cover: product specifications (dimensions, weight, materials, finishes), packaging compliance (labelling, UKCA/CE markings, barcodes, safety warnings), observation of the production line, quality management systems in use, sample verification against your golden sample, and basic worker welfare conditions. We help our sourcing clients build product-specific checklists as part of our onboarding process — ask the Epic team for guidance on yours.
A rigorous pre-shipment inspection should cover at minimum the following areas.
Product specifications: Dimensions, weight, materials, colours — all compared against your approved sample and spec sheet. Any deviation from the approved sample should be flagged, photographed, and included in the report. No deviation is "too small to mention" — let the inspector flag it and you decide whether it matters.
Packaging and labelling: For UK importers, this is critical and often underestimated. Packaging must carry correct product descriptions in English, country of origin labelling ("Made in China" or "Made in Vietnam"), UK compliance markings (UKCA or CE where applicable), correct barcodes and SKU numbers, and any required safety warnings or age suitability statements. UK Trading Standards and HMRC customs officers take labelling seriously — non-compliant labelling can result in goods being held at the border or destroyed at your expense.
Workmanship defects: Scratches, stains, poor stitching, loose parts, uneven finishes, cracked components, misprints. Inspectors use an internationally recognised AQL (Acceptable Quality Level) sampling system — based on ISO 2859-1 — to determine how many units to inspect from your production batch and what defect rate is considered acceptable. Standard consumer goods inspections typically use AQL 2.5 for major defects; stricter inspections use AQL 1.0.
Functionality testing: For products that need to actually work — electronics, fitness equipment, personal care devices, children's toys — basic function testing should be part of every inspection. Does it turn on? Does it perform its intended function? Does it switch off correctly? Obvious as this sounds, "it didn't work when we opened it" is one of the most common customer complaints from importers who skipped functional testing in their QC inspections.
Safety compliance documentation: If your product requires CE or UKCA marking, the factory should have relevant UK-recognised safety testing reports on file. Your inspector should verify that the production units match the tested version — it's surprisingly common for factories to have test reports for an earlier version of a product while manufacturing a slightly modified (and therefore untested) current version. For a full guide to UK import compliance, see our Complete Guide to Importing from China to the UK.
Sourcing Hack #4: Always send your approved physical sample — your "golden sample" — to the inspection agent or the factory before production begins, and have the factory sign off on it as the agreed reference standard. Verbal approvals and emailed photographs are not sufficient. Having a physical golden sample in the factory's hands eliminates most "we didn't know that's what you wanted" arguments when an inspection reveals a discrepancy. It's also your strongest piece of evidence if a dispute escalates. We recommend keeping a duplicate golden sample in your own possession as well — just in case.
If your pre-shipment inspection fails — the goods don't meet spec and the inspector issues a "fail" result — you have several options, and which one you choose depends on the severity of the issues found.
The best outcome for minor issues is negotiating with the factory to rework the defective units before shipment. If it's a small percentage of packaging errors or surface-level workmanship issues, this is usually achievable within two to three days, after which a re-inspection confirms the rework is complete. For more significant quality issues — widespread defects, incorrect materials, functional failures — you may need to negotiate a partial shipment (taking only the acceptable units), a price reduction to compensate for the substandard goods, or in the worst case, a full production redo at the factory's cost.
These conversations are significantly easier to have while goods are still in China than after they've arrived in the UK. Once goods have cleared HMRC customs and arrived at your warehouse, your leverage over the factory largely disappears. This is one of the underrated advantages of having a sourcing agent with people on the ground: when an inspection fails, we're there immediately — in Mandarin, in person — negotiating a resolution while the goods are still physically accessible. That kind of rapid, local response is extremely difficult to replicate from a UK desk, even with the best inspection report in hand. For more on how we handle supplier relationships and dispute resolution, see how our White Label service works end-to-end.
The same principles and inspection types apply in Vietnam as in China — pre-shipment inspections, DPIs, and factory audits are equally important regardless of the manufacturing country. The practical difference is that the QC agency network in Vietnam is less extensive than in China, and fewer agencies have deep specialist expertise across all product categories. Working with a sourcing agent who operates in both countries (as Epic Sourcing does) gives you consistent quality control processes regardless of where your goods are being manufactured.
If you're trying to decide whether to manufacture in Vietnam or China in the first place, our companion post Vietnam vs China Manufacturing 2026 — Which Should UK Businesses Choose? covers the full comparison in detail.
A standard pre-shipment inspection from a third-party QC agency typically costs between £200 and £500 for a half-day inspection, depending on the agency, the factory's location, and the complexity of your product. If you work with a sourcing agent, QC is often included within your service package rather than charged separately. Re-inspections after factory rework cost a similar amount to the original inspection. Budget these costs as a fixed line item in your product landed cost from day one — they're non-negotiable on first orders from any supplier.
For new suppliers: always, without exception. For established suppliers with a consistent track record of passing inspections, you may be able to reduce inspection frequency over time — perhaps every second or third order — depending on your risk tolerance and the value of each order. High-value orders, any order introducing design or material changes, and orders with strict UK compliance requirements (UKCA markings, CE certification, specific safety standards) should always be inspected regardless of how long you've worked with a factory.
AQL stands for Acceptable Quality Level — an international standard (ISO 2859-1) used by QC inspectors to determine how many units to sample from a production batch and what defect rate is tolerable. The most common AQL levels for consumer goods are 2.5 (standard — a small percentage of defects is acceptable) and 1.0 (stricter — fewer defects tolerated). Your inspection agency or sourcing agent will determine the correct sample size based on your total batch quantity using AQL statistical tables. Ask which AQL level is being applied to your inspection and whether it's appropriate for your product type and customer expectations.
Since Brexit, the UK has its own conformity marking — the UKCA (UK Conformity Assessed) mark — required for certain regulated products sold in Great Britain (England, Scotland, Wales). CE marking (European conformity) remains required for Northern Ireland. Regulated product categories include electronics, toys, PPE, medical devices, machinery, and others. Your factory must hold UK-recognised test reports — not just EU test reports — for products requiring UKCA marking. HMRC and UK Trading Standards actively enforce this at the border; non-compliant products can be seized, destroyed, or require costly modifications. Always confirm compliance requirements with a professional before importing regulated goods.
No. Factory-provided photos and video calls show you exactly what the factory wants you to see — they're not an independent verification of your goods. Photos can be staged, taken of a small subset of production, or simply show the approved sample rather than the actual manufactured units. A physical inspection by an independent inspector — or your sourcing agent's team — involves random sampling across the production batch, physical measurement and weight checks, and hands-on quality assessment. There is no digital substitute for having someone physically present in the factory.
No. ISO 9001 means the factory has a quality management system in place — it does not guarantee that your specific order meets your specific requirements. QC inspections and ISO certification serve completely different purposes and are complementary, not interchangeable. A factory can hold ISO 9001 and still produce goods that don't match your spec sheet, use substituted materials, or fail your packaging compliance requirements. Always run a pre-shipment inspection, regardless of what certifications the factory holds. We see this misconception regularly from newer importers — please don't learn this lesson the expensive way. Our post on importing from Alibaba to the UK covers more common first-timer mistakes worth avoiding.
If the factory disputes the inspection findings, your first step is to review the inspection report and photographs carefully — a good QC report will be specific enough to make the issues undeniable. If the factory still disputes the findings, you can request a re-inspection by a different independent agency, or escalate through your payment protection mechanism (most reputable importers use trade assurance or bank transfers with milestone payments, which give you some financial protection). Engaging a sourcing agent with legal and commercial experience in China can be invaluable at this stage — navigating supplier disputes from the UK, without Chinese language skills and local knowledge, is extremely difficult.
Quality control isn't glamorous. It doesn't have the excitement of finding a great new product or negotiating a cracking deal. But it's the unsexy foundation that determines whether your sourcing business actually works — whether the goods arriving at your UK warehouse match what you ordered, whether your customers are happy, and whether your brand reputation stays intact.
At Epic Sourcing, quality control is built into everything we do. Our team in China and Vietnam manages supplier vetting, production monitoring, and pre-shipment inspections as standard — so our UK clients aren't relying on luck or hoping a factory does the right thing. We've seen what happens when QC is skipped, and it's not a lesson any business owner should have to learn firsthand.
If you're currently sourcing from China or Vietnam and want to make sure your QC process is properly set up — or if you're about to place your first overseas order and want expert support from day one — we'd love to talk.
Drop us a line at hello@epicsourcing.co.uk or book a free strategy call with the Epic Sourcing team. No obligation — just straight, experienced advice on protecting your product and your business.
— TK Wang, Founder & Director @ Epic Sourcing
