The Site Visit That Saves You a Containerload of Problems
Two suppliers can send identical quotations, identical drawings and identical photographs, and be completely different businesses. One owns extrusion lines, tooling and a quality department. The other owns a laptop and a relationship with the first one. The difference shows up in lead time, consistency and what happens when something is wrong.
This checklist is what experienced buyers actually work through on a factory visit or a structured video audit. Use it before you place the first order rather than after the first dispute. If a site visit is not possible, our guide to reading supplier drawings covers what to demand in writing instead.
Confirm Who You Are Actually Buying From
| Check | What to ask for | Green flag | Red flag |
|---|---|---|---|
| Business licence and scope | Licence showing manufacturing, not just trading | Manufacturing in the registered scope, matching the address you are visiting | Registered address is an office in a different city |
| Ownership of equipment | Asset list or equipment photos with serial numbers | Extrusion or moulding lines in the supplier’s own name | All production described as “our partner factory” |
| Export history | Export records, references in your region | Repeat customers and verifiable shipments | Only domestic references, no export documentation |
| Factory size and staffing | Headcount by function, floor area | Named production, QC and engineering staff | Sales team far larger than production headcount |
Production Capability
- Walk the process end to end from raw material to packing. Gaps in the tour are informative
- Count the lines and ask for output per shift. Compare against the lead time you were quoted
- Ask who owns the tooling. A supplier who owns the extrusion dies and injection moulds can hold tolerances and repeat orders; one who does not is dependent on someone else’s schedule
- Check the material store. Virgin resin with documentation beats regrind of unknown origin, particularly for food contact parts
- Ask about changeover and custom profiles. Real manufacturers can explain minimum run lengths and tooling costs concretely — see our OEM and private label guide
- Observe the finishing area. Cutting, drilling and deburring quality is where most visible defects originate
Quality Control: Look for Records, Not Certificates on the Wall
| Area | Evidence to request | Why it matters |
|---|---|---|
| Incoming material | Material certificates, resin grade, batch records | Confirms virgin material, UV stabiliser content and food-contact suitability |
| In-process inspection | Dimension check sheets with dates and tolerances | Shows whether inspection happens or is merely claimed |
| Final inspection | Per-order inspection report, sampling plan | Determines what you would actually receive |
| Non-conformance handling | NCR log with root cause and corrective action | Every factory has defects; good ones record and close them |
| Calibration | Calibration records for callipers, gauges and scales | Uncalibrated gauges make inspection records meaningless |
| Traceability | Production batch tied to material batch and shipment | Without it, a field failure is untraceable |
Product-Specific Checks for Hydroponic Equipment
- Channel and profile dimensions: measure wall thickness at several points; thin walls and inconsistent section are the most common cost reduction
- UV stabilisation: ask for the stabiliser system and any weathering test data, particularly for outdoor installations
- Food-contact compliance: request declarations and test reports for the relevant standard in your market
- Mechanical fit: assemble a sample on the spot — channel, end cap, lid, net pot and grommet from the same batch
- Tank and pipework: check wall thickness, weld quality and pressure rating documentation
- Metal parts: confirm grade and coating; stainless claims should come with a grade certificate
- Packaging for export: how are channels protected against stacking damage and container condensation?
Commercial and Contractual Checks
| Item | What to pin down |
|---|---|
| Lead time | Production days after deposit, not including shipping, with a stated capacity assumption |
| MOQ | Per SKU and per colour; and whether the MOQ is per order or per shipment |
| Payment terms | Deposit percentage, balance trigger, and whether it is against documents or against delivery |
| Warranty | Duration, what is covered, what voids it, and how a claim is settled |
| Incoterms | Who carries risk where, and who handles customs clearance |
| Penalties | Late delivery and quality non-conformance remedies, however modest |
| Spare parts | Availability period after purchase and pricing mechanism |
| IP and tooling | Who owns custom tooling and drawings, and what happens to them |
Engineering and After-Sales Support
- Ask to see a full drawing set for a completed project: layout, hydraulics, structural reactions if relevant
- Ask how they handle a design change after order — a real engineering team has a revision process
- Ask for the commissioning scope in writing: who attends, for how long, and what is included
- Ask for the spare parts recommendation for your exact configuration, with part numbers
- Ask for two references you can call, ideally in your region and at a similar scale
- Ask what they will not do. Suppliers who claim every capability rarely deliver the difficult ones
Remote Audit: What to Request When You Cannot Travel
| Request | Purpose |
|---|---|
| Live video walkthrough with a time stamp | Confirms the site exists and is operating |
| Production video of your specific product | Confirms in-house capability for that item |
| Business licence and address match | Confirms manufacturer status |
| Recent inspection report for a shipped order | Shows the QC system in operation |
| Sample set from a current production batch | Lets you measure, assemble and test |
| Packing list and loading photos from a recent shipment | Reveals export and packing competence |
Scoring the Visit
- Score each section out of five and require a minimum total before awarding the order
- Weight quality records and material traceability highest. Price is easy to compare; consistency is not
- Write the findings up within 48 hours while the detail is fresh, including photographs
- Send the punch list to the supplier and judge them partly on how they respond to it
- Re-audit on a cycle. A supplier audited once three years ago is not an audited supplier
FAQ
How do I tell a manufacturer from a trading company?
Check the business licence for manufacturing scope, confirm the registered address matches the site, ask who owns the tooling, and walk the production process end to end. Traders can usually show a showroom but not a production line running your product.
What quality records should I ask for on a factory audit?
Incoming material certificates with batch numbers, in-process dimension check sheets with dates, a final inspection report with the sampling plan, a non-conformance log with corrective actions, and calibration records for inspection equipment.
What are the highest-risk shortcuts in hydroponic equipment?
Reduced wall thickness on channels and profiles, insufficient or absent UV stabilisation, undocumented regrind in food-contact parts, and fittings that are dimensionally close but not fully compatible with the profile.
Can I audit a supplier remotely?
Yes, with a structured request: live video walkthrough, production video of your product, licence and address verification, a recent inspection report, current-batch samples you can measure yourself, and loading photographs from a recent shipment.
Should I place a trial order before the full order?
Always. A container or part-container trial at full commercial terms tests production consistency, packing, documentation and communication in one step, and it costs far less than discovering the same problems at full volume.
How often should I re-audit a supplier?
Every two to three years for ongoing supply, and immediately after any change of ownership, major process change, or a significant quality incident. Treat supplier qualification as a maintained status rather than a one-time achievement.
Get a Supplier Questionnaire Before Your Next Order
Send your equipment list, volumes and target market through the quote form. We will return our audit questionnaire, the documentation pack for our products, and an invitation to a live factory walkthrough with our engineering team.