Sourcing cellular roof sheets from China
Cellular polycarbonate roofing sheets from China carry 6% UK duty on the relevant heading 3921 line, with no listed trade remedy. Confirm with the relevant authority whether a designated construction product standard applies and what declaration of performance and UKCA or CE marking requirements apply. Cambridge China Bridge sources cellular polycarbonate roofing sheets.
6% duty on cellular roofing sheet
Read from the UK Trade Tariff on 19 October 2026, heading 3921 covers other plastic plates, sheets, film, foil and strip. Cellular polycarbonate roofing sheet falls within the other cellular plastics category, with 3921 19 00 99 the candidate line to confirm. The table shows product variants sharing that line, rather than separate tariff classifications.
The supplied tariff record gives 6% duty for goods from China and lists no anti-dumping or countervailing duty on this line. Its suspensions concern specified silicone foam, microporous films and dialysis-filter material, rather than polycarbonate roofing sheets. The tariff attaches a restriction on entry into free circulation concerning ozone-depleting substances; confirm the declaration requirement with your customs broker.
Give your broker the polymer composition, cross-section, dimensions and details of any further working to confirm the commodity code. For other materials within this heading, see the foam sheet and laminates guide.
| Goods | Commodity code | Duty | Anti-dumping or countervailing duty on China |
|---|---|---|---|
| Clear twinwall polycarbonate roofing sheet | 3921 19 00 99 | 6% | None |
Specify the sheet and roof assembly
Specify twinwall or multiwall construction, overall thickness, wall geometry, mass per area, cut dimensions, tolerances, colour and light transmission. State the ultraviolet protective layer and how its installation face will be identified. Agree the intended roof use, support spacing, loading assumptions, thermal movement allowance and compatible glazing bars, seals and end closures.
For building use, check whether a designated construction product standard covers the sheet. Confirm with the relevant authority what declaration of performance and UKCA or CE marking requirements apply, and obtain fire classification evidence matching the supplied product. CE marking remains available for construction products placed on the Great Britain market. Have the proposed roof assembly and supporting performance evidence reviewed before approving production.
Worked duty example
Illustrative example, not a quote: An illustrative consignment of cellular polycarbonate roofing sheets under 3921 19 00 99, invoiced at £12,000 free on board, with £3,200 of freight and insurance to the UK. The customs value is £15,200. Duty at 6% is £912. Import VAT at 20% is charged on the customs value plus duty, £16,112, so it is £3,222.40. Import taxes total £4,134.40; a VAT-registered importer can usually reclaim the VAT, so the lasting cost is the £912 of duty. The import duty and VAT guide explains each step.
Inspection checklist
Dimensions: measure length, width and thickness across sampled sheets; compare mass per area and internal wall geometry with the approved specification.
Surface and protection: check scratches, colour consistency, protective film and identification of the ultraviolet protected installation face.
Channels and packing: check for crushed ribs, cracks, trapped debris and moisture; inspect edge protection and support beneath sheet bundles.
Documents and fit: match product identification to performance and fire reports, then trial the ordered bars, seals and closures. Include these checks in the inspection brief.
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What goes wrong
Overall thickness can look correct while thin internal walls leave the sheet below the agreed mass. Other failures include inconsistent tint, scratched surfaces, crushed channels and protective film that does not identify the installation face. Reports for a different sheet construction do not establish the performance of the ordered grade.
Poorly matched glazing bars and closures can leave gaps or obstruct drainage. Approve a sample assembly, record its components and installation details, and compare production sheets with the retained sample before shipment.
Cambridge China Bridge sources these products for UK businesses, checking the factory and the documents before shipment. See factory verification. For repeat volumes, see container programmes.
Frequently asked questions
What is the UK import duty on cellular polycarbonate roofing sheets from China?
The supplied tariff record gives 6% duty on 3921 19 00 99, with no listed anti-dumping or countervailing duty. Confirm that the exact sheet belongs on this line.
Can I claim the tariff suspension for polycarbonate roofing sheets?
The suspensions listed on this line describe other materials and uses. They do not describe ordinary cellular polycarbonate roofing sheets; budget for 6% duty.
Do polycarbonate roofing sheets need CE or UKCA marking?
Where a designated construction product standard applies, confirm the declaration of performance and UKCA or CE marking requirements with the relevant authority. Check the scope against the exact sheet and intended use.
What should I check when roofing sheets arrive?
Check dimensions, mass per area, internal walls, surface damage, colour, protected-face identification and clean channels. Trial the glazing bars, seals and end closures against the approved sample assembly.