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To compare aluminum window quotes accurately, give suppliers the same window schedule, define the required performance and reconcile everything included in the price. Then compare confirmed offers using the same currency, quantities and delivery scope.
For distributors, importers, contractors and developers, this process helps distinguish a competitive offer from a quotation that still needs technical clarification or additional charges.
Two suppliers may quote the same opening sizes while offering different frames, glass, hardware, packaging or services. A useful comparison makes those differences visible before the purchase order is approved.
The purchasing decision should consider the complete specification, evidence of suitability, total cost within an agreed scope and the supplier’s delivery commitments.
Use the following checklist to review each quotation. Record the supplier’s actual response and supporting document reference for every item.
Comparison item | What to check |
|---|---|
Drawing revision | Same window schedule, window marks and approved changes |
Dimensions and quantities | Finished frame sizes, opening arrangements and units per item |
Aluminum system | Profile drawings, frame depth, material and thermal break details |
Glazing | Complete glass build-up, treatments, coating and spacer specification |
Performance evidence | Applicable ratings, test methods and coverage of the offered configuration |
Hardware | Named products, model references, quantities and suitability for the sash |
Finish | Color, texture, coating specification and approved sample |
Accessories | Screens, restrictors, installation accessories and spare parts |
Services and packaging | Drawings, samples, inspection, crating and labeling |
Delivery scope | Named delivery location, freight inclusions and remaining buyer costs |
Commercial terms | Currency, quote validity, payment milestones and change charges |
Warranty and support | Covered components, exclusions, remedies and replacement arrangements |
Give each requirement a status: Confirmed, Clarification Required or Does Not Meet.
An unanswered requirement should remain open until the supplier provides a clear response.
Size is only one part of an aluminum window specification. Different opening arrangements, glass configurations, hardware and finishes can change the offered product. Quotations may also cover different quantities, packaging or delivery responsibilities.
A price difference may reflect a valid alternative, a missing item or a more efficient supply arrangement. Ask the supplier to explain the difference rather than judging quality from the price alone.
Keep optional upgrades separate from the base offer so the purchasing team can see what each alternative changes.
An RFQ, or request for quotation, should give every supplier the same starting information. Issue one controlled package containing the window schedule, relevant drawings, destination, required performance and delivery requirements.
Assign a revision number and date. When a requirement changes, send the same update to every shortlisted supplier and request a revised quotation.
Ask suppliers to identify departures from the RFQ in a separate list. A substitute system may be acceptable, but its suitability should be reviewed before its price enters the final comparison.
For help preparing the technical schedule, refer to the WINTENIC Aluminum Window Specifications Guide.
Compare quotations by window mark, such as W01 or W02. For each mark, reconcile the dimensions, opening configuration, quantity, unit price and line total.
Confirm whether dimensions describe the rough opening or the finished frame. Also identify the drawing viewpoint, opening direction and any installation flange or extension included in the quoted size.
If prices are quoted per square meter, ask how billable area is calculated. Clarify minimum billable areas, rounding and separate charges for accessories or small units.
For example, a finished frame measuring 1.2 m × 1.5 m has a nominal area of 1.8 m². That calculation does not establish the supplier’s billing rules. Obtain the actual line total before comparing offers.
Request a sectional drawing and a precise system reference. Check frame depth, sash configuration, material specification, thermal break construction and any project-specific reinforcement.
Treat a description such as “70 series” as a supplier reference that needs explanation. The number alone does not establish an equivalent design across manufacturers.
Likewise, a quoted wall thickness should identify the relevant profile and measurement basis. It cannot independently establish the performance of the assembled window.
Where suppliers propose different systems, compare them against the project requirements and supporting evidence. Record the selected system in the final specification so purchasing and inspection teams can identify what was agreed.
Terms such as “double glazing” and “Low-E glass” need further detail before they can support a quotation comparison.
Ask suppliers to identify:
The thickness and treatment of each pane.
Cavity width and specified gas fill, where applicable.
Low-E product or coating reference and its position.
Laminated glass construction and interlayer, where required.
Spacer and insulating glass edge-seal specification.
Relevant safety, thermal and acoustic documentation.
Give each approved glass configuration a code and use that code consistently in the schedule, drawings and quotation.
If a supplier proposes alternative glazing, request a separate option with its price difference and performance information. Review that alternative before allowing it to replace the specified glass in the base offer.
Check whether quoted thermal figures describe the glass, frame or complete window. Compare values using the same units and an appropriate common rating method. A glass-only figure should not be entered into a comparison field intended for whole-window performance.
For structural, air and water performance, request the report reference, test method, tested configuration and any applicable size limitations. Ask how the evidence supports the exact products being offered. For example, the North American Fenestration Standard distinguishes performance classes and grades rather than relying on a general “commercial grade” description.
Use the standards and evidence required for the destination and project. A supplier’s general certificate collection does not by itself establish that a particular quoted configuration is suitable.
Ask for hardware model references and quantities, including hinges or rollers, locking components, handles and any restrictors. A brand name alone leaves room for different product selections.
Have the supplier confirm that the proposed hardware suits the window configuration and sash weight. Record who must approve substitutions if a component becomes unavailable.
For finishes, document the color reference, texture or gloss, coating specification and interior/exterior arrangement. Establish how samples and delivered appearance will be assessed.
Finally, reconcile accessories. Screens, keys, covers, installation brackets and spare components should be marked as included, optional, excluded or not applicable. Small omissions can become significant across a large order.
Ask what services are included before and after manufacturing. Identify charges for drawings, samples, project-specific testing, third-party inspections and special documentation where these are required.
For packaging, confirm the protective materials, crate or rack arrangement, identification labels and loading plan. WINTENIC’s Packaging and Shipping page provides an overview of its packaging approach; the quotation should identify the arrangement proposed for your order.
Clarify whether the supply is factory glazed, requires glazing on site or includes other site assembly. Confirm the availability and price of necessary accessories and instructions.
State separately whether installation, unloading equipment, perimeter sealing and site adjustment are included. These responsibilities affect the purchasing budget and construction schedule.
Request the agreed Incoterms rule, named place or port and version where those rules are used. Incoterms allocate responsibilities, costs and risks between buyer and seller.
Build the comparison around a defined destination and identify costs that remain outside each supplier’s offer. Ask specifically about freight, insurance, destination handling, clearance, applicable duties and taxes, local delivery and unloading.
Record which party pays each item and avoid counting included costs twice.
Confirm when manufacturing lead time starts and what must happen first. Drawing approval, specification confirmation, material arrangements and agreed payments may affect the start date.
Distinguish factory completion, dispatch and arrival. Compare payment milestones against those events and include quote validity, currency and any price-adjustment conditions in the review.
Request written warranty terms for the relevant components and failure types. Check the remedy, required evidence, exclusions and who pays for replacement freight or site labor.
For distributors, ask about compatible replacement parts and how to identify them for future service requests.
Consider a hypothetical order of 50 windows. Both suppliers have reviewed the same schedule. Supplier A’s initial offer needs priced changes to reach the agreed specification; Supplier B includes those items.
For this illustration, assume technical suitability has been verified after the changes. All figures are invented USD amounts used to demonstrate the comparison method, not market prices or WINTENIC quotations.
Cost item | Supplier A | Supplier B |
|---|---|---|
Initial product quotation | $20,000 | $21,800 |
Confirmed changes to required glazing and hardware | $1,800 | Included |
Required screens | $500 | Included |
Agreed export packaging | $800 | $800 |
Quoted transport and handling to the same warehouse | $1,600 | $1,500 |
Comparable subtotal | $24,700 | $24,100 |
Supplier A initially appears $1,800 cheaper. After the confirmed adjustments, Supplier B’s comparable subtotal is $600 lower.
The example assumes that non-tax transport and handling charges within the stated delivery scope are covered by the transport row. Import duties, taxes, installation and financing are excluded and must be evaluated separately for each offer before making a final decision.
The outcome depends on the actual quotations. In another comparison, the lowest initial price may remain the best value after all requirements are reconciled.
Use this approach for each supplier:
Comparable cost = confirmed product total for the agreed specification + required items excluded from that total + additional costs to the agreed comparison point.
First, obtain a revised offer for necessary specification changes. Do not assume that adding an estimated upgrade cost will make a product technically suitable.
Second, add only confirmed charges or clearly identified estimates from appropriate providers. Keep provisional estimates visible rather than presenting them as fixed supplier commitments.
Third, mark unresolved items as “TBC” and hold the comparison open. An unknown cost should not be treated as zero.
Finally, compare technically acceptable offers alongside delivery feasibility, payment exposure and service arrangements. Keep those considerations visible instead of hiding them inside an invented cost allowance.
Use the following clarification request with your quotation comparison sheet:
Please confirm that your quotation follows the attached window schedule and drawing revision. Identify all deviations and provide the proposed frame system, glass configuration, hardware references and applicable performance documents. Please mark accessories and services as included, optional or excluded. Confirm the delivery scope, remaining buyer costs, lead-time starting conditions, payment milestones, warranty terms and quotation validity. Please issue a revised quotation incorporating the agreed clarifications.
Ask suppliers to answer by window mark or requirement reference so the responses can be incorporated into the final order documents.
Pause the comparison when you encounter:
A total price without an itemized window schedule.
Performance figures without product identification or a rating basis.
Glazing or hardware described only as “premium” or “equivalent.”
Freight included without a named destination and scope.
A delivery promise without defined starting conditions.
A warranty duration without coverage and remedy details.
Substitution rights that bypass purchaser approval.
These gaps are reasons to request better documentation. A supplier’s clear, consistent response helps the purchasing team decide whether the offer is ready for approval.
Before issuing the purchase order, confirm that:
The quotation and drawings reference the same revision.
Quantities, configurations and totals have been reconciled.
Required performance evidence has been reviewed.
Deviations and optional alternatives have written decisions.
Included items, exclusions and delivery responsibilities are clear.
Payment, schedule, inspection and warranty terms are recorded.
The accepted quotation and technical documents are incorporated into the order.
Assign one person to maintain the approved document set. This gives the supplier, inspection team and receiving team a consistent reference throughout the purchase.
Use one window schedule and specification, obtain written clarification of differences, and compare technically acceptable offers on the same cost and delivery basis. Keep unresolved items visible.
Possible reasons include different configurations, quantities, exclusions, delivery scope or commercial terms. Ask for a documented explanation and a revised price for the agreed specification before deciding.
It is insufficient on its own. Confirm the configuration, billable area rules, quantities and separate charges, then compare line totals for the same window schedule.
Thickness is one characteristic of the proposed system. Review the complete profile design, applicable project requirements and performance evidence before deciding whether the price difference offers value.
Yes. The Low-E designation alone does not identify the complete glazing or window configuration. Compare the detailed build-up and applicable whole-window ratings using a consistent basis.
Request traceable reports, listings or certificates and confirm their applicability to the offered product. Review the test or rating method, configuration, dimensions and limitations relevant to your project.
Yes, after adding the relevant costs to reach the same comparison point. Identify responsibilities and exclusions carefully, and separate unconfirmed freight or destination charges from fixed amounts.
Compare coverage, exclusions, remedies and service arrangements alongside duration. Check which components are covered and who bears replacement freight, removal and installation costs.
Mark the item as requiring clarification and request a written response. Incorporate the agreed answer into the revised quotation and order rather than relying on a separate informal assurance.
Send your window schedule or drawings, quantities, destination, required performance, preferred configurations and delivery requirements. Identify your business type and any purchasing priorities or approved alternatives.
WINTENIC offers aluminum window and door products and OEM/ODM services for customized requirements.
Whether you are sourcing for a distribution business or a building project, send us your window schedule and specification. Identify the opening styles, dimensions, quantities, glass, hardware, finishes and destination, together with your required delivery date.
Ask for pricing by window mark and clarification of the proposed configurations, included items and delivery scope. This gives your purchasing team a clearer basis for reviewing the offer and preparing the final order.
