Inspection works when the team agrees what will be checked, when evidence is available and who can stop or release work before defects are packed into a container.

A final inspection is booked after every crate is closed. The inspector can count packages and see labels, but cannot verify concealed glass build-up, reinforcement, drainage machining or hardware preparation. The inspection did not happen too late by accident; the control plan failed to place hold points where evidence still existed.

Technical boundary: Inspection frequency, sampling and acceptance criteria must follow the contract, specification, risk and responsible project process. This guide does not prescribe a universal sample size or certify production.

1. Hold the pre-production meeting against released documents

Use a document register, not memory. Confirm the order baseline, opening marks, quantities, revisions, approved samples, materials, evidence gaps, production route, subcontracted processes, inspection points, packing marks and communication authority.

The meeting ends with actions, owners and dates. ‘Discussed’ is not a disposition; unresolved critical inputs remain a hold on affected work.

Pre-production meeting agenda
ControlEvidence to reviewOutput
Scope and quantitiesContract/schedule/BOQ reconciliationReleased marks and exceptions
ConfigurationDrawings, samples and component schedulesApproved revision set
Performance evidenceReports/calculations/project requirementsApplicability status and open gaps
Process and inspectionProcess flow and quality planWitness/hold/review points
Packing and shipmentMarks, loading and document planRelease package and responsibilities

2. Convert project risk into inspection characteristics

List characteristics whose failure would be hard to detect later, expensive to replace, safety-related, interface-critical or repeated across many units. Examples may include opening/handing, dimensions, glass identity, reinforcement, drainage, hardware preparation, finish, seals and labels—but the project documents decide the actual criteria.

For each characteristic, state the method, stage, frequency or sampling basis, record and acceptance authority. ‘Check quality’ is not an inspection instruction.

Inspection-control plan
CharacteristicStageMethod/evidenceFrequency/basisAcceptance sourceRecord/owner
Opening type/handingFirst-off + productionDrawing comparison[define]Released drawing[record]
Concealed componentBefore closureIdentity/photo/measurement[define]Approved configuration[record]
Operation/hardwareAssembly/finalDefined function check[define]Schedule/instruction[record]
Packing/labelsBefore loadingReconciliation[define]Packing plan[record]

3. Approve first-off units before repetition

Choose first-offs across different systems, opening types, finishes and high-risk configurations—not only the simplest window. Confirm identity, geometry, component route, workmanship, operation and required concealed evidence before the process repeats.

Link the first-off result to the approved sample record, while keeping visual/configuration approval separate from performance evidence.

  1. Verify the current drawing and configuration revision.
  2. Inspect characteristics while still visible.
  3. Operate every moving element using the defined method.
  4. Record deviations and corrective action.
  5. Reinspect the corrected unit and affected process.
  6. Authorise repetition only for the documented configuration.

4. Make sampling representative and traceable

Define the lot before selecting samples: product family, production period, line, shift, material batch or another meaningful grouping. Spread selection across opening types, sizes, glass/hardware routes and production stages where risk differs.

Do not invent a universal percentage. The agreed plan should state lot definition, selection method, sample quantity, acceptance/rejection rule, escalation and reinspection. Record every inspected unit or opening mark so the result can be traced.

Sampling limitation: A passing sample supports the stated plan for the defined lot; it does not prove that every uninspected unit is defect-free.

5. Define operation and hardware checks

For applicable units, check opening direction, handing, movement, lock engagement, handle/restrictor function, clearances and obvious interference against the approved configuration and supplier instructions. Record the condition in which the check occurred, including glazing and adjustment status.

Avoid vague labels such as ‘smooth’. Use observable conditions and a disposition. A factory function check does not establish cycle durability, installed operation after building movement or compliance with project safety requirements.

Function check record
Unit/markConfigurationCheck conditionObserved resultAdjustment/defectDisposition
[enter][enter]Glazed/unglazed; supported state[record][record]Accept/hold/reinspect

6. Make labels serve installation and traceability

Agree labels before packing: project, opening mark, building/zone/floor, unit identity, package number, orientation or handling warnings where needed, and any required compliance label governed by the destination. Keep labels legible but avoid exposing confidential project information unnecessarily.

Reconcile unit labels, package labels, packing list and drawings. A beautifully printed label with the wrong opening mark accelerates the wrong installation.

  • Opening mark and project zone
  • Package/unit relationship
  • Orientation or handling instruction
  • Configuration or batch traceability where agreed
  • Required statutory/compliance marks
  • Language and weather/abrasion durability
  • Confidentiality and removal responsibility

7. Close non-conformances with evidence, not promises

Give each non-conformance an identity, affected population, containment, requirement, observed condition, cause review where needed, corrective action, owner and due date. Determine whether other units made by the same material or process need review.

Repair or rework requires an approved method and reinspection. A photo of one corrected corner does not close the affected batch unless the record shows which units were corrected and verified.

Non-conformance closure
FieldRequired record
Issue and requirementWhat differs from which controlled source
Affected scopeUnits, lot, batch or process
ContainmentStop, segregate and protect
DispositionUse-as-is/rework/replace/reject by authority
VerificationReinspection evidence and result
PreventionProcess/document action where applicable

8. Use a shipment-release dossier

Release is a named decision after agreed hold points close. Compile the order/revision baseline, inspection summary, non-conformance status, approved deviations, test or evidence status, packing list, labels, loading evidence and required commercial documents.

List open minor items explicitly with authority and recovery date. Never convert an inspector’s attendance or draft report into shipment approval unless that person has the contractual authority and the defined release conditions are met.

Shipment release gate
GateStatus/evidenceAuthority
Scope and revisionReconciled[name]
Inspection/first-offResults attached[name]
Non-conformanceClosed or authorised exception[name]
Packing/labels/loadingRecords complete[name]
Documents/paymentContract gate satisfied[name]
Final decisionRelease/hold[name/date]

9. Preserve the evidence chain through receiving

Send the packing register and opening-mark logic to the receiving team before arrival. At delivery, record container seal and condition, package count, visible damage, shortages and the location of quarantined items before evidence is lost.

Continue the same unit identity into the first-installation inspection and after-sales archive.

Closed loop: The shipment is not fully controlled when it leaves the factory; it is controlled when the receiving record can reconcile what was released, loaded and received.

FAQ

What should be decided at a pre-production meeting?

Released documents, configurations, evidence gaps, process route, inspection gates, packing, responsibilities and open actions.

What percentage of windows should be inspected?

There is no universal percentage. Define lots and a risk-based or contractually specified plan with selection and acceptance rules.

Does final inspection replace in-process inspection?

No. Concealed or irreversible characteristics require checks while evidence remains accessible.

Can an inspection report itself release shipment?

Only if the contract gives that authority and every defined release condition is satisfied.

Should corrected defects be reinspected?

Yes. Record the affected scope, approved disposition, correction and verification result.

Continue the project review

Connect this guide with the proposed window and door systems, then review how Cavorlen approaches manufacturing and quality control. When your schedule is ready, send it through the project review form.

Official sources used

ISO 10013 — Guidance for documented information ↗ISO — Guidance on documented information for ISO 9001:2015 ↗ASTM E2112 — Installation of exterior windows, doors and skylights ↗IMO — CTU Code ↗

Related buyer guides

Editorial boundary

This guide does not approve a sampling plan, product, test result, shipment or project performance. Qualified and authorised parties must define and apply the governing acceptance requirements.