CN code 7308 30 of the Combined Nomenclature covers doors, windows and their frames and thresholds made of iron or steel. In commercial practice, this heading encompasses steel industrial doors, fire doors, warehouse doors, steel windows, window and door frames and metal frames used in industrial, commercial and residential construction. Classification under CN 7308 30 requires the product to constitute a finished door, window or frame of iron or steel. Aluminium doors and windows are classified under heading 7610, while wooden ones fall under Chapter 44. Steel doors equipped with locks, hinges and handles are classified together under CN 7308 30, as accessories form an integral part of the product. Fire doors must comply with fire classification standards EN 13501-2 and EN 1634-1, evidenced by a fire resistance certificate (EI 30, EI 60, EI 90 or EI 120). Emergency exit doors are subject to EN 179 or EN 1125 depending on the panic hardware type. Classification follows the General Rules for Interpretation, in particular Rules 1 and 6 and notes to Chapter 73.

Importing steel doors, windows and frames under CN code 7308 30 into the European Union is governed by the Union Customs Code. Since 1 January 2026, products under heading 7308 fall within the scope of CBAM, requiring importers to register as authorised CBAM declarants, submit quarterly emissions declarations and purchase CBAM certificates. Steel doors and windows as construction products are subject to the Construction Products Regulation (CPR) No 305/2011. Fire doors require CE marking based on harmonised standard EN 16034 in conjunction with EN 14351-1 (external doors and windows) or EN 14351-2 (internal doors). The Declaration of Performance must specify fire resistance class, smoke tightness and self-closing capability. External doors and windows are subject to thermal performance requirements under EN 14351-1, including the thermal transmittance coefficient Uw. Required import documents include a commercial invoice, technical specification, CE Declaration of Performance, fire test certificates (for fire doors), material certificates and certificate of origin.

Steel doors, windows and frames under CN code 7308 30 may be subject to EU trade defence measures. Steel safeguard measures under the TRQ system may cover products under heading 7308 with an additional 25 percent duty above the quarterly quota limit. Imports of steel products from Russia and Belarus are prohibited under EU sanctions. Anti-dumping duties on steel doors and windows from specific countries may apply - the current status should be verified in TARIC. The market for steel fire and industrial doors in the EU is a significant trade segment, with major suppliers from Turkey, China and Southeast Asian countries. Steel doors intended for public buildings must additionally meet accessibility requirements for persons with disabilities. Preferential rates under EU FTAs may reduce import costs. Importers should account for customs value, conventional duty, AD and safeguard measures, CBAM obligations and VAT in their cost calculations. Total import costs and current trade measures should be verified in the TARIC system of the European Commission.

Products classified under CN code 7308 30 (steel doors, windows and frames) must comply with applicable EU technical standards. Depending on their intended use, these may include harmonised EN standards for construction products (CPR Regulation 305/2011), the Machinery Directive or the Pressure Equipment Directive (PED). Construction products require CE marking and a Declaration of Performance (DoP). Customs authorities verify compliance with technical requirements during clearance and may withhold release of goods where required documentation or certificates are missing.