Two Standards, One Facade: Why Buyers Get Confused

European facade procurement runs on CE marking, and the two harmonized standards that dominate the conversation are EN 13830 (curtain walling — product standard) and EN 14351-1 (windows and doors — product standard). Both are cited for facade elements, and suppliers routinely blur the line between them. For a buyer sourcing aluminum glass curtain walls from China, understanding which standard governs your element is the difference between a smooth customs clearance and a rejected specification.

The short version: EN 13830 is the product standard for curtain walling as a complete facade system — stick and unitized systems, with their framing, glazing, and fixings tested as one assembly. EN 14351-1 governs windows and pedestrian doorsets, including the window units that sit inside a curtain wall. A full curtain wall is not a window, so it is not covered by EN 14351-1; but the window elements embedded in the wall are.

"The consultant asked for 'CE-certified curtain wall, EN 14351-1'. The supplier happily provided a CE DoP — for the window units, not the wall system. The curtain wall itself had no EN 13830 DoP, and the project stalled for a month." — Procurement manager, London facade project

EN 13830: The Curtain Wall Product Standard

EN 13830 (curtain walling — product standard) is the harmonized standard for curtain wall systems under the EU Construction Products Regulation (CPR 305/2011). It covers the complete wall assembly: the frame grid (mullions and transoms), infill panels, glazing, gaskets, and the interface fixings. Key declared characteristics include:

EN 13830 also covers impact resistance, thermal transmittance (U-value) of the system, reaction to fire, acoustic performance, and safety in use. The standard is tested on a representative specimen of the wall system — not a single window — which is why the test cost and lead time are substantially higher than for windows.

EN 14351-1: The Window and Door Standard

EN 14351-1 is the harmonized product standard for windows and pedestrian doorsets without fire resistance and/or smoke control characteristics. It covers the individual window unit: frame, sash, glazing, and hardware as a factory-made product. Declared characteristics include wind load resistance (classes A1-C5), watertightness (classes E1A-E9A), air permeability (classes 1-4), U-value, sound insulation, and safety devices.

The critical point for facade buyers: EN 14351-1 applies to windows and doors as separate products, including those installed within a curtain wall or facade. When you buy a curtain wall with integrated opening vents, the opening elements may carry their own EN 14351-1 DoP, while the wall system carries an EN 13830 DoP. Both documents are needed — they are complementary, not alternatives.

Decision Table: Which Standard Applies to Your Element

What the Buyer Must Verify in the Documentation

1. DoP exists for the right product. An EN 14351-1 DoP does not certify a curtain wall. If your contract is for a curtain wall system, require the EN 13830 DoP with the system name and the tested specimen configuration.
2. Performance classes match your specification. Verify the declared classes — air permeability (AE1-AE4), watertightness (RE1-RE9), and wind load class — against the project brief. A "CE certified" claim without class values is incomplete.
3. Test specimen represents your configuration. EN 13830 tests a representative specimen. Confirm the tested mullion spacing, panel sizes, and glazing match your project's typical module — a test on a 1.5m module does not cover a 3m module.
4. Fire and safety characteristics. Reaction-to-fire class (e.g., A1, A2-s1,d0 for the frame) and impact safety must be declared. For UK projects, also check compliance with the CWCT facade guidance and any post-Grenfell requirements.

How Chinese Factories Deliver EN 13830 Compliance

Rogenilan Windows Doors, a Foshan-based curtain wall manufacturer, supplies aluminum glass curtain wall systems engineered for CE compliance under EN 13830. Prototype testing is carried out at accredited laboratories, with the full performance class table declared in the DoP. For projects using integrated opening vents, the vents carry their own EN 14351-1 certification — both documents are delivered with the shipment, giving the facade contractor a complete compliance file.

2026 Indicative FOB Prices for Curtain Wall Systems

Prices are indicative 2026 factory FOB ranges for project volumes (2,000+ m²), excluding engineering, test fees beyond standard scope, freight, and installation. EN 13830 prototype testing is quoted separately per configuration. Contact Rogenilan Windows Doors for a project-based quotation.

Curtain Wall Compliance FAQ

Can a Chinese factory issue an EN 13830 CE DoP?

Yes. EN 13830 compliance is based on testing and the manufacturer's factory production control (FPC). A Chinese manufacturer can hold the FPC and issue the DoP after accredited testing — the same legal route any EU manufacturer uses. What matters is that the test laboratory is notified/accredited and the DoP lists the real system configuration.

Is EN 14351-1 acceptable for a curtain wall?

No — not as the sole standard. EN 14351-1 covers windows and doors. A curtain wall system requires EN 13830. If a supplier offers only an EN 14351-1 DoP for a curtain wall, the wall system itself is not CE marked; only the window units within it are.

What is the difference between stick and unitized curtain walls for compliance?

Stick systems are assembled on site from mullions and transoms; unitized systems arrive as factory-assembled panels. EN 13830 applies to both, but unitized systems are tested as complete panels including their inter-panel joints — which is where watertightness is won or lost. The test specimen must reflect the actual system type.

How long does EN 13830 testing take?

From specimen approval to a final report, plan for 8-14 weeks including wind load, air permeability, watertightness, and thermal tests. This lead time must be inside your project schedule — it is the most common planning failure in curtain wall procurement from China.