about us
Provide design and manufacture of doors and windows for Hospitality, Residential, Healthcare and Commercial
800 +
Projects Completed
1,000 +
Hardware Options
100 +
An Excellent team to support you
100,000㎡
Factory Areas
2,500+
Satisfied Customer
+
Years Experience
Welcome to Grandsea
Professional Door and Window Manufacturer
Our advantage lies in the use of advanced production technology and high-quality raw materials to ensure that every door and window can meet strict quality standards.
windows
We offer a variety of opening methods ( sliding, casement, tilting, etc.) to meet different space requirements. Each type is carefully designed to ensure the best user experience.
doors
It has excellent sound insulation and thermal insulation properties, effectively blocking external noise and improving living comfort.
Accessories
All doors and windows are equipped with high-quality hardware to ensure their durability and safety. Each accessory has been strictly tested to ensure its stable performance.
materials
The use of new insulation materials and thermal insulation technology greatly reduces heat conduction, making Grandsea's aluminum alloy doors and windows far superior to its peers in terms of energy saving.
why choose us
save money
We are committed to providing customers with high-quality and cost-effective products. By optimizing production processes and supply chain management, we can reduce production costs while ensuring quality, thereby providing customers with more reasonable prices.
Personalized customization service
Whether it is size, color or style, we can design and produce according to the specific requirements of customers. Our design team will work closely with you to ensure that the final product not only meets the functional requirements, but also perfectly integrates into your architectural style.
Excellent quality
Grandsea’s doors and windows are made of high-quality raw materials and combined with advanced production technology to ensure that each door and window has excellent quality. We strictly follow international quality standards and all products are strictly tested to ensure their durability, sound insulation and waterproofness.
Excellent after-sales service
The completion of manufacturing does not mean the end of cooperation. We are well aware of the importance of after-sales service to customer experience. Grandsea provides comprehensive after-sales support, including installation guidance, maintenance suggestions, problem solving, etc. No matter what problems you encounter during use, we will respond in time and provide professional help.
2500+ global customers choose us
Grandsea Building provides high-quality window and door products for the hospitality industry | residential industry | healthcare industry | education industry | commercial industry, including:
- Houses and villas
- Apartments
- Hotels
- Offices
- Schools
- Hospitals
What Our Customers Reviews
As leading custom doors and windows manufacturer in China, Grandsea uses high-quality products to bring you the best user experience
leading doors and windows manufacturer in China
As an industry-leading door and window manufacturer, we are committed to providing customers with high-quality and diversified aluminum window solutions. As a well-known aluminum windows manufacturer, our product line covers a full range of needs from residential aluminum window manufacturers to commercial aluminum window manufacturers. Our professional team is not only proficient in the technology of aluminum storm windows manufacturer, but also has rich experience in the field of aluminum clad wood window manufacturers. With advanced production equipment and innovative design concepts, we are proud to be among the best aluminum window manufacturers. Whether it is facing the protection needs of severe weather or pursuing commercial projects that are both beautiful and practical, we can provide customized solutions. We focus on product quality, attach importance to customer experience, and continuously promote the development of industry standards. Choosing us means choosing a professional, reliable and excellent door and window partner. Let us work together to add the perfect finishing touch to your construction project.
