China has become a global hub for aluminum window manufacturing, offering a wide range of high-quality, customizable products at competitive prices. However, before importing aluminum windows, it’s essential to perform due diligence to avoid costly mistakes and ensure your investment is secure. Here are five key things to check before placing your order.

1. Supplier Verification and Credentials

Start by researching your supplier’s business license, company registration details, and certifications. A reliable manufacturer like Delanshini Doors and Windows will be transparent about their qualifications, factory facilities, and export history. Always verify:

• Business license and export permit
• ISO certification or equivalent quality management system
• CE, NFRC, or relevant international certifications (if required in your country)
• Previous export experience and client references

2. Quality of Materials and Workmanship

Aluminum window quality varies greatly depending on raw material grade and manufacturing processes. Ask for detailed specifications including:

• Aluminum profile thickness (typically ≥1.4mm for residential use)
• Surface treatment (anodized, powder-coated, or wood grain)
• Glass options (tempered, double-glazed, Low-E)
• Hardware brands used (hinges, locks, handles)

Request samples or a virtual factory tour to evaluate finish, corner joints, and overall build quality.

3. Customization and Technical Support

Whether you’re working on a residential or commercial project, you may need windows tailored to specific sizes, colors, or opening styles. Ensure the supplier offers:

• OEM/ODM service
• Engineering drawings and 3D renderings before production
• Support for local building codes and installation requirements
• Flexible order quantities and packaging customization

Delanshini specializes in custom aluminum windows and can assist with design adaptation for different markets.

4. Shipping Logistics and Packaging

Overseas shipping can expose your goods to damage if not packaged properly. Verify:

• Window packaging (foam, corner protectors, wooden crates)
• Loading method (container layout, weight distribution)
• Shipping timelines and port handling
• Whether the supplier offers CIF, FOB, or DDP terms

A trusted factory should have experience exporting worldwide and provide clear documentation including packing lists and certificates of origin.

5. After-Sales Service and Warranty

Make sure to clarify the warranty terms and how after-sales issues are handled. Important questions to ask:

• What’s covered under the product warranty?
• Who pays for replacements or repairs if there’s a defect?
• Can they provide installation guidance or videos?
• Do they offer ongoing support for repeat projects?

Delanshini provides full technical support, including installation videos and one-on-one service, to ensure a smooth experience from factory to site.

Conclusion

Importing aluminum windows from China can be a smart move for builders, developers, and wholesalers—provided you choose the right supplier and ask the right questions. From product quality to shipping logistics and support, doing your homework will save you time, money, and hassle in the long run.

Looking for a reliable aluminum window manufacturer in China?

Contact Delanshini Doors and Windows today at wang@gddlsn.com to discuss your project and request a free quote.