Quick Answer: To compare aluminium window suppliers fairly, give each one the same project brief and ask for itemized answers on the window system, opening types, glass, hardware, finishes, documents, quality checks, packaging, and commercial scope. Review evidence against the actual proposed configuration and destination. A company label or low headline price alone does not show whether a supplier fits your project.
Key takeaways
- Send the same drawings, window schedule, quantities, dimensions, project location, and requirements to each supplier.
- Compare the full configuration-profiles, opening types, glazing, hardware, finishes, and accessories-not the word "aluminium" alone.
- Ask which test reports, certificates, and local compliance documents apply to the exact configuration and market.
- Make quotation assumptions, exclusions, packaging, shipping scope, sample approval, and after-sales responsibilities visible before comparing totals.
Start with a complete project brief
Searching for aluminium window suppliers may bring up manufacturers, fabricators, distributors, and supplier directories. Those labels describe different business models, so begin by defining what your project actually needs. A supplier cannot prepare a useful, comparable quotation if each bidder receives a different description of the job.
Before you request prices, gather the information already available and mark undecided items clearly:
| RFQ input | What to include | Why it matters |
|---|---|---|
| Project context | Building type, project stage, site location, and destination market | Helps identify which product, documentation, and delivery questions still need confirmation |
| Drawings and schedule | Architectural drawings, window schedule, opening references, and revisions | Gives each supplier the same basis for counting and reviewing openings |
| Quantities and dimensions | Sizes and quantities by opening or schedule reference | Prevents totals from being based on different assumptions |
| Opening types | Sliding, casement, tilt-and-turn, fixed, or other specified types | Helps define the required window configurations |
| Glass and hardware | Stated glass build-up, safety needs, hardware preferences, and any project criteria | Keeps component choices visible as part of the proposed assembly |
| Finish and colour | Finish type, colour reference, and sample or approval requirements | Clarifies what is included in the quoted finish scope |
| Performance inputs | Any project-specified thermal, acoustic, wind, water, air, or other targets | Allows the supplier to state whether evidence is available for the relevant configuration |
| Commercial and document scope | Required documents, inspection expectations, packaging, shipping responsibilities, and target dates | Makes scope gaps and exclusions easier to identify before price comparison |
If details are missing, send the current documents and list open questions. Do not let different suppliers fill the gaps silently in different ways.
Compare the complete window specification
"Aluminium windows" is a material category, not a complete specification. A project quotation should identify the proposed system and the components that affect fit, appearance, operation, and the evidence needed for review.
Ask each supplier to state, where applicable:
- the profile or system series and the intended application;
- the frame and sash configuration, opening type, and key dimensions;
- glass type, thickness or build-up, spacer, and any specified coating or safety treatment;
- hardware type and finish, operating method, and included accessories;
- surface finish and colour reference;
- screens, grilles, restrictors, or other schedule items;
- the items included in the window package and any items supplied by others.
The proposed configuration should be checked against the project drawings and requirements. If a supplier suggests an alternative, ask for it to be listed separately with the reason for the change and any evidence available for that alternative. This makes it possible for the design or procurement team to compare like with like and review substitutions deliberately.
You can explore SGL's aluminium window options as a product starting point. The project schedule and confirmed requirements should guide the final discussion.
Check product documentation, test reports, and local regulatory requirements.
When requesting test reports, certificates, or compliance documents, clearly specify the target market and relevant project requirements. Ask the supplier to provide specific product configurations, the scope of testing, the issuing body, dates or validity periods (where applicable), and any limitations regarding the document's scope of application. Subsequently, ensure that the project architect, curtain wall consultant, engineer, or local authority confirms that the relevant documentation indeed covers the actual requirements. As applicable requirements vary by market and project, verification by relevant local professionals is essential.
If the project has established specific performance criteria, require the supplier to cross-reference each criterion with the corresponding supporting documentation or to explicitly state if such verification data cannot be provided. Distinguish between product performance declarations and responsibilities regarding project approval and installation.
Review samples, quality checks, packaging, and support
If the supplier is required to produce samples prior to formal collaboration, clearly define the pre-production specifications-such as color, dimensions, hardware, and surface finishes. It is essential to specify which documents apply to the respective samples to ensure a consistent reference standard for subsequent production and inspection.
Engage in practical discussions regarding specific inspection and quality control requirements. For instance, clearly define the scope of inspection, inspection stages, responsible parties, and the procedures for recording and resolving any issues identified. These details should be tailored to the specific procurement agreement and project.
For project or export orders, clearly outline requirements for packaging, labeling, protective measures, responsibilities regarding loading or transport, and the documentation to be provided by each party. Verify the shipping scope and schedule listed in the supplier's current quotation, as these factors depend on the specific order, destination, and agreed-upon terms.
Finally, designate the points of contact responsible for handling technical issues, document revisions, sample approvals, shipment status updates, and post-delivery matters.
Compare quotations line by line
Once suppliers have received a consistent RFQ, use a comparison sheet to expose differences in both price and scope.
| Comparison field | Questions to resolve |
|---|---|
| Product scope | Are all scheduled openings and quantities included? Are alternatives listed separately? |
| System and components | Are profiles, glass, hardware, finish, and accessories specified clearly? |
| Documents and evidence | Which requested documents are included or available for review? What still requires validation? |
| Samples and inspection | Are samples, approvals, inspections, or records included? Who arranges and pays for them? |
| Packaging and shipping | What packaging, export, loading, freight, and destination responsibilities are included or excluded? |
| Commercial terms | What are the payment, validity, tax, currency, and variation terms in the offer? |
| Programme and support | What dates are proposed, what assumptions affect them, and who handles technical or post-delivery questions? |
Ask suppliers to list exclusions and assumptions beside the relevant line item. If prices differ substantially, check first whether a quotation omits glass, hardware, accessories, documentation, packaging, or another required part of the scope. Resolve those differences before making a decision.
How SGL approaches project enquiries
Established in 2006, SGL operates three major workshops dedicated to the processing of doors, windows, and glass. The company employs a business model that integrates in-house manufacturing with supply chain management. Regarding product selection and solution assessment, SGL develops practical, implementable plans based on the architectural drawings, schedules, dimensions, and reference images provided by clients.
We warmly welcome inquiries from contractors, construction firms, distributors, individual homeowners, and design companies. SGL is also actively seeking agents in various countries and regions; as opportunities are limited, please contact us for further details.
SGL's company and manufacturing overview
Aluminium window supplier RFQ checklist
Before sending your request, check that you have included or explicitly marked each item:
- Project type, location, destination market, and current stage
- Latest drawings and window schedule, with revision date or identifier
- Opening references, dimensions, quantities, and opening types
- Profile or system requirements, if already specified
- Glass build-up and any project performance or safety criteria
- Hardware, finish, colour, and accessories
- Required test evidence, certificates, and local documents
- Sample approval and inspection expectations
- Packaging, labelling, export, and shipping responsibilities
- Quotation currency, validity, payment terms, and required response date
- Items that are undecided or require the supplier to propose an option
Sending this information to every bidder in the same format makes the responses easier to review and the remaining questions easier to identify.
FAQ
Q: What should I ask aluminium window suppliers before requesting a quote?
A: Ask suppliers to confirm the proposed configuration, evidence for the named market, exclusions, and responsibilities for samples, inspection, packaging, shipping, and support. Request written assumptions so that remaining gaps are visible before you compare offers.
Q: What is the difference between an aluminium window manufacturer and a supplier?
A: "Manufacturer" generally refers to a company that fabricates or assembles products, while "supplier" can also describe a distributor or trading business. Labels vary, so ask which steps the company performs, which products or components it sources, and who is responsible for drawings, production, inspection, documents, and support for your order.
Q: Should I compare suppliers by price alone?
A: No. First confirm that each quotation covers the same openings, quantities, system, glass, hardware, finish, documents, packaging, shipping scope, and commercial terms. Then review the itemized costs and exclusions. Price comparisons are meaningful only when the quoted scope is clear.
Q: Can a supplier confirm compliance with my local building code?
A: The applicable requirements depend on the project and jurisdiction. Ask what product-specific evidence the supplier can provide, then have the project's responsible local professionals confirm whether it satisfies applicable regulations and approval requirements.
Prepare a comparable project RFQ
A clear RFQ gives aluminium window suppliers a shared basis for responding. Use the checklist above, mark undecided items, and ask each supplier to state its assumptions and exclusions.
For an initial discussion of product selection, contact SGL with your project documents. The proposed configuration, available evidence, commercial terms, and project responsibilities can then be reviewed against the information supplied.
