FAQ

Guangdong Dejiyoupin Doors and Windows Co., Ltd. (DERCHI) is an established direct manufacturer with over 25 years of specialized expertise in the architectural opening and precision fenestration industry.

Our company operates an advanced 180,000 m² manufacturing plant in Foshan, Guangdong—the epicentre of China's aluminium engineering sector—staffed by more than 600 skilled technicians, structural specialists, and assembly professionals. By managing all extrusion processing, thermal assembly, CNC machining, glass lamination, and quality verification in-house, we eliminate third-party markups to supply factory-direct wholesale pricing, guaranteed supply chain stability, and robust OEM/ODM engineering for European and global commercial and residential projects.

We engineer high-performance, thermally efficient, and structurally certified door systems configured to adhere strictly to demanding building codes and diverse climatic exposures. Our four core systems comprise:

Aluminium Entry & Pivot Doors: Thermally broken aluminium leaves, oversized architectural pivot doors with German concealed pivot hardware, heavy-duty sliding patio systems, and commercial façade entrances.

Stainless Steel & Security Doors: High-tensile stainless steel structures, anti-drill leaf reinforcements, and multi-point perimeter deadbolt systems built for anti-burglary reliability.

Cast Aluminium Entrance Portals: Three-dimensional cast relief panels engineered for heritage villas, prestige estates, and bespoke luxury developments requiring timeless artistry and zero-corrosion longevity.

Automated & Interior Architectural Systems: Solid timber and acoustic-rated interior doors, fire-rated compartment doors (EN 1634-1), and insulated sectional overhead garage systems with integrated smart automation.

Because bespoke architectural projects require tailored thermal, physical, and hardware parameters, all wholesale quotes are calculated from exact specifications to avoid superfluous overhead. To receive a detailed cost breakdown and preliminary CAD shop drawings, please furnish:

1. Architectural Documentation: CAD files, schedule elevations, rough opening dimensions, or structural window/door schedules.

2. Profile Aesthetics & Finishes: Requested RAL powder coatings (Qualicoat standard), architectural fluorocarbon (PVDF) paints, anodised sheens, or realistic timber grain transfers.

3. Glass & Performance Targets: Desired glazing configurations (double or triple insulated glass units, laminated acoustic PVB, Low-E solar controls) and target thermal values (U_D ratings).

4. Hardware & Automation: Specified multi-point locking grades, smart biometric keypads, concealed door closers, or automated access control integrations.

For standard custom dimensions and catalog profiles, our production cycle is typically completed within 25 to 35 calendar days following receipt of the production deposit and final sign-off on detailed CAD shop drawings. For large-scale multi-unit developments or highly complex custom pivot leaves, production slots are scheduled in coordinated batches matching your site critical path.

All finished products are encased in heavy-duty export-grade plywood crates, protected with anti-scratch films and desiccants, and delivered via containerized sea freight to key European and world ports, including Rotterdam, Hamburg, Antwerp, and Felixstowe.

Every commercial and residential shipment manufactured by Guangdong Dejiyoupin Doors and Windows Co., Ltd. is backed by our direct 10-year structural warranty. This warranty guarantees leaf flatness, profile extrusion integrity, thermal barrier bonding, and resistance against corrosion, flaking, or delamination under normal operating conditions.

Precision moving hardware, precision hydraulic pivot boxes, and motorized automation systems carry comprehensive parts-replacement warranties backed by our technical spare-parts inventory.

We ensure that our international partners experience seamless handover and execution through every stage of construction:

Shop Details & Manuals: Each unit is supplied with detailed sub-frame installation instructions, anchoring details, and perimeter flashing cross-sections.

Step-by-Step 3D Video Guice: Accessible digital documentation highlighting alignment procedures, pivot adjustments, and seal compressions.

Live Technical Consultations: Fluent English-speaking structural and fenestration engineers available to support on-site installers across European working hours (CET/GMT).

Strict structural and thermal compliance is fundamental to our manufacturing process. DERCHI holds CE certification under the harmonised European standard EN 14351-1 for external pedestrian doorsets. Our products undergo rigorous testing according to EN ISO 10077 (Thermal Transmittance), EN 12207 / 12208 / 12210 (Air Permeability, Water Tightness, and Wind Load Resistance), and EN 1627 (RC2/RC3 Burglar Resistance).

In addition, our systems are manufactured in compliance with ISO 9001 quality management, AS 2047 (Australia) requirements, and relevant international fire codes, providing architects and builders with the reliable documentation necessary to satisfy local building control audits.