Best quality windows & doors manufacturer
As a professional door and window manufacturer, we are committed to providing high-quality, durable and beautiful door and window products.
"Best service we have ever use."
800 +
Projects Completed
1,000 +
Hardware Options
100 +
An Excellent team to support you
100,000㎡
Factory Areas
2,500+
Satisfied Customer
25 +
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.
Ordering process
Get custom doors and windows in just 5 steps – get what you want!
01
Demand consultation
Initial communication:
You can have initial communication with our professional consultants by phone or email to learn about our door and window product types, customization options and service processes.
Demand analysis:
Our consultants will discuss their specific needs with you in detail, including site size, usage scenarios, style, budget range, etc., in order to provide a basis for subsequent design.
02
Design proposal
Customized design:
Based on your needs and on-site dimensions, our design team will provide personalized door and window design plans, including style, color, material and other choices.
3D renderings:
To help customers understand the design effect more intuitively, we will provide 3D renderings to facilitate customers to modify and confirm.
03
Quotation and confirmation
Transparent quotation:
After confirming the design plan, we will provide a detailed quotation, including material costs, labor costs and other related costs, to ensure transparent prices and no hidden costs.
Signing the contract:
Once the customer confirms the quotation and design plan, a formal contract will be signed and production will begin
04
Customization and manufacturing
High-standard production:
We have advanced production equipment and technology to ensure that every door and window meets high quality requirements. During the production process, we will strictly control every link to ensure product quality.
Progress tracking:
Customers can learn about the progress of their orders at any time through us, and we will provide pictures or videos to keep the information transparent.
05
Shipping and delivery
When your order completed and was packed, we would organize to load containers and shipping to your port .Even delivery to your warehouse.
Our projects
Patio doors
Window for villa
Floor-to-ceiling windows in lobby
Windows for apartment
What Our Customers Reviews
As leading custom windows and doors supplier in China, Grandsea uses high-quality products to bring you the best user experience
The integrated management of the entire process from material selection, measurement to installation has greatly saved my time and energy. In particular, the full follow-up service they provided made me worry-free during the construction process.
David
Building Contractors
Grandsea uses high-quality materials and advanced technology to ensure that the quality of the final product meets high standards, which makes me feel very relieved when I accept it later. This shopping experience allows me to focus more on the overall project without having to worry about the details of the doors and windows.
Alaya
Designer
In the process of shopping for doors and windows, I was able to choose the right style and color of doors and windows according to my preferences and home style, which made me feel very fulfilled.
Kerri
Villa owner
popular informations
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