Ordering custom windows and doors for a villa starts with a clear specification: opening sizes, operating styles, frame systems, glazing, hardware and the requirements of the installation site. Before comparing prices from China, make sure each quotation describes the same products and responsibilities.
A photograph can help communicate the look you want. It cannot confirm whether a large sliding door will fit your opening, how the frame handles heat, or what is included in delivery. This guide explains what to prepare, what evidence to request and what to approve before production.
A window and door schedule is a list that gives every opening its own reference number. Link that number to the floor plan, elevation and quotation so everyone is discussing the same item.
Record the room, quantity, opening width and height, frame colour, operating direction and any screen or privacy requirements. State whether measurements describe the structural opening or the finished unit. Ask your local installer to confirm the measurement method and installation allowance before approving manufacturing dimensions.
| Information to send | What it helps confirm |
|---|---|
| Project country, city and site conditions | The requirements your project team needs the supplier to address |
| Plans, elevations and opening references | Which product belongs in each location |
| Verified dimensions and quantities | The scope and basis of the quotation |
| Opening style, direction and panel arrangement | How each unit operates and fits the surrounding space |
| Frame finish, glass specification and hardware | Whether offers describe comparable configurations |
| Destination, delivery scope and required site date | Which logistics and timing assumptions need clarification |
Choose custom aluminum windows and doors by room and access requirements, rather than using one system everywhere. A bedroom, courtyard entrance and wide patio opening can have different priorities.
Sliding doors: confirm how many panels move, where they stack and the resulting clear opening. Discuss tracks, drainage and cleaning access.
Casement windows: check the opening direction against walkways, screens, curtains and nearby fittings.
Tilt-and-turn windows: review the operating positions, handle access and space needed for inward opening.
Folding doors: confirm panel stacking, threshold details, support requirements and the space occupied when open.
Coobuildgroup’s doors and windows collection includes sliding-door, casement-window and tilt-and-turn listings. Use the collection to identify styles to discuss, then request the dimensions, configurations and supporting documents available for your project.
A narrow frame or a large glass panel may suit your design, but appearance alone does not establish performance. Ask which frame system is proposed, whether it has a thermal break, and how the glazing, seals and hardware are specified.
Aluminum conducts heat readily. A thermal break separates parts of the frame with a less conductive material to reduce heat flow, as explained by the U.S. Department of Energy’s guide to window technologies. The name “thermal break” alone does not give you a verified performance rating for the finished unit.
For glazing, request the full build-up: pane types and thicknesses, cavity details where applicable, coating specification and any privacy treatment. Ask the project’s designer or qualified local adviser to identify safety-glazing needs for the proposed locations.
Where energy performance is being compared, distinguish a glass-only value from a whole-product rating. NFRC’s residential certification programme independently verifies energy-performance information, including U-factor and solar heat gain coefficient. Lower U-factor indicates less heat transfer; SHGC describes how much solar heat passes through. The appropriate combination depends on the climate and project requirements.
A supplier’s catalogue may cover several systems. Request documents for the actual system and configuration being quoted, and have your project team check whether the evidence covers the proposed application.
Product drawings showing frame sections, panel arrangement and installation interfaces.
Relevant test reports or certification records, with identifiable product details and issuing organisations.
Glass, hardware and finish specifications tied to the quotation.
Written warranty terms, exclusions, claim procedure and replacement-part arrangements.
For a U.S. project, confirm the applicable local requirements with your project professional before ordering. For South Africa, Zimbabwe or another African destination, identify the requirements for that specific country and site. A document used for one market does not establish acceptance in another.
Handles, locks, hinges, rollers and seals affect daily use and future maintenance. Ask for the proposed hardware specification and how replacement parts can be identified and obtained. For large panels, have the system supplier confirm the relevant size and weight limits.
Discuss thresholds, drainage, fixing points, waterproofing interfaces and final floor levels with the installer. Agree who supplies anchors, sealants, trims and screens, who unloads the units, and who checks operation after installation. A supply quotation should make these boundaries clear.
The lowest product price is not necessarily the lowest complete project cost. Put quotations side by side using the same opening schedule and specification, then identify every included and excluded item.
Check the product amount, packaging, inland transport, export coordination, freight, insurance, destination charges, taxes where applicable, delivery, unloading and installation. Ask your freight or customs adviser to verify destination costs for the shipment; do not assume that a quotation includes duties or delivery to your site.
If two offers differ, identify the reason before negotiating. Different glazing, panel arrangements, hardware, finish, packing or delivery scope can make apparently similar custom sliding glass doors difficult to compare.
Before production, agree on the final drawing revision, opening schedule, finish references, glazing and hardware. Record changes in writing so the approved scope remains traceable.
Before shipment, agree on the checks and evidence you will receive. Useful items include dimensional check records, operating checks, photographs, item labels and a packing list linked to opening references. Confirm whether units arrive assembled or require work on site, together with the handling instructions and installation information available.
Build time into your programme for specification review, approvals, production, inspection, freight and site preparation. Request a project-specific schedule instead of treating a general lead-time statement as a confirmed installation date.
Coobuildgroup is a building-materials sourcing business based in Foshan, China. Its sourcing services can be discussed alongside your door and window requirements, particularly when several finishes need to be coordinated for the same villa.
Start with your drawings, opening schedule, destination and preferred styles. Ask the team to confirm which systems can be proposed, what documentation is available and what the quotation includes. You can also ask about a Foshan showroom visit or a video discussion to review available options.
Drawings provide a starting point for review. Feasibility depends on the selected system, dimensions, panel weights, hardware and project requirements. Agree on final manufacturing drawings after the site measurements and installation details have been checked.
Provide opening references, quantities, dimensions, preferred operating styles, frame finishes, glazing requirements and the destination. If a detail is undecided, ask the supplier to label its assumption or price it as a separate option.
Selection depends on climate, performance requirements, design and budget. Compare documented whole-product performance and installation details rather than relying on the system name alone.
Ask about remote drawing reviews, video discussions, samples and inspection arrangements. Video can help explain options, but it cannot replace every physical sample, measurement or document check.
No. Compare equivalent products on a delivered and installed basis, including verification, logistics, destination costs and after-sales arrangements. The result depends on your project and the offers available.
Send Coobuildgroup your window and door schedule, project location and preferred styles. Discuss suitable options, available documentation and a quotation with a clearly defined supply scope.
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