Buying the same door down the street and buying it from a factory across the ocean are two different contracts wearing one product name. Locally, one entity measures the opening, fits the door, signs the warranty, keeps the files, and answers the phone. Buy factory-direct and those five jobs split across four or five parties in two countries. The door did not change; the chain that stands behind it did.
| Question | Domestic purchase | Factory-direct export |
|---|---|---|
| Who measures the opening | The local supplier | You, or your architect, send millimetres |
| Who installs and seals the reveal | The local supplier | Your local contractor; the factory cannot |
| Who signs the performance document | The supplier named on the invoice | Often the importer, not the factory |
| Who keeps the technical file | One file, one building | Split across factory, agent, and you |
| Who is the first responder | One phone number | You must connect the segments yourself |
The most useful sentence in this whole article is the one above: you buy a local supplier you buy one chain; you buy factory-direct you buy four segments and must be the person who connects them. A good swing door supplier is only as good as the chain you assemble around them.
A supplier directory is a table whose columns are decided by the person maintaining it, not by you. The ten fields that decide whether a container of swing doors is right for your project appear on none of those lists, because they are attributes of an order, not of a company.
| What a directory prints | What it tells you | What it never tells you |
|---|---|---|
| Company name | The legal entity exists | Whether it owns a press |
| Year founded | Rough age of the entity | Whether the door line is new |
| Location | Which industrial cluster | Registered vs actual production address |
| Product photos | A look, possibly staged | Tolerances at your volume |
| Certificates | A management system was assessed | That your specific door meets spec |
| Contact | A mailbox to write to | Who answers on a Saturday |
No directory prints the five fields that decide price: alloy and temper, glass build-up, hardware platform, sash weight, and Incoterm. Those live only in your request for quotation. Write them as a table, not as a paragraph, because a paragraph is where assumptions hide.
When you email a shortlist, three different kinds of company will reply. They are not ranked by honesty; they are ranked by what they can prove about your door.
| Type | What it actually does | Evidence to ask for | Where it gets stuck |
|---|---|---|---|
| Extrusion plant | Pushes the aluminium section | Mill test certificate for the alloy | Usually does not assemble the whole door |
| System-assembly plant | Cuts, corners, glazes, fits hardware | Shop drawings, corner-joint method, QC log | May buy the profile from another firm |
| Trading company | Sources, consolidates, exports | Name of the real factory, export records | Cannot redraw your section at week six |
A trading company is not a fraud. Many ship well and consolidate logistics you would struggle to arrange. But at week six, when your architect moves a hinge line, only the plant that owns the tooling can act. Know which one you are emailing before you quote, because the price and the lead time sit in different places.
Every legally registered company in China carries a business licence with an eighteen-character Unified Social Credit Code. Ask for a clear scan, then check the code on the National Enterprise Credit Information Publicity System. The licence also prints a QR code that should resolve straight to that same public record; a code that points elsewhere is a stop sign. Read these fields:
A Chinese plant may build the door but export through an agent. That is legal and common, yet the entity on your invoice, bill of lading, and bank transfer must be one you agreed to in advance. Before the balance is released, you want four papers:
A mark such as CE sits with the importer or brand owner who places the product on the market, not with the Chinese factory, which supplies the technical evidence. Treat any claim of "certified" as a prompt to ask which document supports it.
A swing, or hinged, aluminum door fails in ways a picture cannot show. Order one against a written spec and run three checks before you trust the line:
| Check | What it reveals | What a good result looks like |
|---|---|---|
| Cut a corner | Corner joint and chamber continuity | Filled, continuous chambers, no hollow gaps |
| Open and close two hundred times at spec weight | Hinge, lock, and frame rigidity | No sag, no slack in the latch, smooth travel |
| Pour water on the threshold | Drainage path is real, not drawn | Water leaves the track, none pools inside |
Keep the signed sample as the golden reference. Independent pre-shipment inspection against that sample, with the larger payment tied to a passed result, is the cheapest insurance you will buy.
Terms such as FOB, CIF, or DDP describe who arranges and pays for which leg of the move. They do not move legal liability for a non-compliant product; the importer of record stays the buyer under DDP as well. The practical question is narrower than the term: who is named on the invoice, the bill of lading, and the bank transfer, and did you agree to that name before paying?
This matters because a swing door company that lists only sliding doors is not lying about being a maker; it is simply not the maker for the hinged door you drew. Read the catalog against your section, not against the noun in your email subject.
Send this as a table. Each blank you leave becomes an assumption the factory fills for you, usually in its favour.
| Field | Fill it with | If you leave it blank |
|---|---|---|
| Opening number | ____ | Factory guesses the count |
| Frame size in millimetres | ____ (state frame or reveal) | Wrong wall depth |
| Wall build-up, outside to inside | ____ | Frame sits proud or short |
| Series and frame depth | ____ | Supplier picks the cheapest |
| Glass build-up, spacer included | ____ | Thermal value unknown |
| Estimated sash weight | ____ | Hinge chosen blind |
| Configuration and handing, with convention | ____ | A pair arrives as two same-hand doors |
| Hardware platform and groove | ____ | Spares not cross-sourceable later |
| Colour and coating batch rule | ____ | Phase-two doors mismatch phase-one |
| Packing and container load | ____ | Glass arrives chipped |
| Port and Incoterm | ____ | Liability lands on the wrong party |
| Who signs reveal and perimeter seal | ____ | The leak is nobody's door |
| Ask | A useful answer names | Sounds reasonable, says nothing |
|---|---|---|
| Are you a factory? | Scope verbs on the licence | "We are a leading manufacturer" |
| What is your monthly capacity? | A number with lines behind it | "Large, no problem" |
| Can I see the floor now? | A live walkthrough link | "Send us your schedule" |
| What alloy and temper? | A grade with standard and version | "Top quality aluminium" |
| Who is the importer of record? | A named entity you control | "We handle everything" |
| What does the mark actually cover? | A document number and scope | "Fully certified" |
| What is the corner method? | Injected bracket or welded | "Very strong" |
| Can you redraw at week six? | Yes, with in-house engineering | "We follow the drawing" |
| What spares ship in the container? | A listed kit by sash | "Available on request" |
| Who is first responder after arrival? | A named contact and channel | "We have good service" |
Factory-direct export is not always the right answer. Skip it when:
Sometimes, through volume, rebates, and logistics consolidation. Compare total landed value, not the factory gate number.
No. A tour can be recorded in a competitor's hall. Independent on-site inspection or a verified licence with a matching QR is the real check.
Yes, exactly. A mismatch is one of the strongest fraud signals there is; never wire to a personal or offshore account.
The importer or brand owner who places the product on the market; the factory supplies supporting technical evidence.
A deposit to start, with the larger balance released only after a passed pre-shipment inspection against the golden sample.
Yes. A factory swing door systems line and a sliding line are different products with different hardware and sealing; name the operation before you quote.
