‘Same as before’ is a request for a controlled comparison—not a specification, configuration baseline or production approval.
A developer reorders windows for a second phase and sends the first purchase order with ‘repeat exactly’. The original powder batch is gone, one handle revision is discontinued, the glass processor changed, the seal supplier updated a compound and the destination's cited product rules may have moved. Even if every new component is individually reputable, the completed new unit can differ in colour, interfaces, operation, declarations and maintainability. A repeat order must be released like a new configuration: recover what was actually installed, freeze current project requirements, compare each material and evidence layer, make representative samples and trials explicit, and authorise differences before procurement or production.
New decision: The original approval does not automatically approve a new batch, supplier, formulation, standard edition or destination route. Every claimed carry-over and every difference needs a current evidence owner and authorised disposition.
1. Reconstruct the original as-built—not the remembered order
Start from installed opening/unit identities and the controlled archive. Build the original baseline by mark group: final dimensions/operation/handing; profiles, reinforcement, subframes and couplings; complete glass/IGU; finish process/product/colour/texture and approved sample/batch; hardware, locks, cylinders and accessories; seals/gaskets, setting/support components, sealants/membranes; screens/trims; installation interfaces; labels/declarations; tests/inspections/NCR changes and as-built substitutions.
Distinguish design-approved, manufactured, delivered and installed states. The original quotation or approved sample may not include later substitutions, rework or field changes. Reconcile representative physical units, permanent markings and retained samples where safe/authorised. Mark any unknown; do not convert absence of change records into proof that the tender configuration was installed.
Record why matching is required: adjacent visual continuity, replacement fit, common maintenance/spares, performance consistency, regulatory evidence, tenant/brand standard or another project need. Different objectives lead to different comparison priorities, but none permits unsupported carry-over.
| Layer | Installed evidence | Physical/sample cross-check | Authority/confidence |
|---|---|---|---|
| Frame/system | As-built drawings/BOM/changes | Section/label/mark group | [verified/unknown] |
| Finish/colour | Process/product/code/sample/batch | Retained sample/unit condition | [verified/limited] |
| Glass/IGU | Build-up/processor/marking/batch | Permanent mark/unit records | [verified/unknown] |
| Hardware/seals | Exact schedules/revisions/interfaces | Installed part/profile | [verified/unknown] |
| Installation interface | As-built details and NCRs | Accessible representative condition | [verified/unknown] |
| Regulatory/performance | Applicable declarations/reports/labels | Delivered identity | [scope/status] |
2. Freeze the new order's current destination and project basis
Treat the repeat phase as a current project. Record destination jurisdiction, placing-on-market/permit and contract dates, building/use and exposure, current codes/regulations/designated or harmonised standards, project performance and safety/accessibility/fire/egress requirements, intended use, energy/environmental requirements, labels/languages, importer/economic operators and required assessment/certification route. The former edition remains historical evidence, not automatic current authority.
Revalidate the window schedule and interfaces: opening survey, wall/subframe/detail, structural actions and supports, drainage/air layers, perimeter joints, finishes, screens/guards and installation/testing. A nominally identical opening on another building, elevation or phase may have different exposure, substrate and design loads. Keep physical matching and regulatory/project suitability as separate gates.
Create a current requirement register with official source, edition/date, interpreter, responsible approver and status. Do not claim that a newer standard is stricter/equivalent or that old test evidence carries forward until the authorised technical/legal route compares scope, transition and configuration.
| Requirement layer | Current authoritative source/date | Original basis | Decision/status |
|---|---|---|---|
| Destination law/code | [official current source] | [historical source] | [specialist review] |
| Product standard/assessment | [current cited/adopted route] | [original route] | [scope/transition] |
| Project performance | [current specification/design] | [original values] | [designer] |
| Opening/wall/interface | [survey/details] | [original condition] | [designer] |
| Labels/declarations/language | [current rule/project] | [old record] | [compliance owner] |
| Commercial/logistics | [current scope/route] | [old terms] | [authorised parties] |
3. Compare every material and component at interface level
Build a bill-of-materials delta, not a yes/no sameness column. For aluminium/profile/thermal break or uPVC/reinforcement, compare exact manufacturer/system/revision, geometry, material/temper or formulation where controlled, machining, joining and finish preparation. For glass, compare processor, substrates, thickness/build-up, coating product and surface, heat treatment/laminate, cavity/gas/spacer/seal and markings. For finishes, compare process, product/system, colour, texture/gloss, substrate/preparation, applicator and batch route.
For hardware and seals, compare exact manufacturer/part/revision, handing, load/size range, fixing/machining, connected parts, materials/coatings, operation, safety/security/access/fire functions, maintenance/spares and approvals. For gaskets/sealants/membranes/backing/cleaners, compare profile/compound or exact product, contacts, preparation and written compatibility/adhesion system. A supplier-issued successor code can still change interfaces.
Classify each field: verified same; intentionally changed; unavailable/obsolete; apparently same but source/batch changed; unknown; or not applicable. Attach evidence and owner. ‘Same brand’, ‘same RAL’, ‘same dimensions’, ‘fits existing holes’ and ‘meets latest standard’ are not complete comparison conclusions.
| Component/interface | Original as-built | Proposed repeat batch | Difference/evidence | Disposition owner |
|---|---|---|---|---|
| Profiles/reinforcement/joints | [exact] | [exact] | [same/change/unknown] | [system designer] |
| Finish/colour | [process/product/sample/batch] | [current route] | [visual/instrument evidence] | [architect/owner] |
| Glass/IGU | [complete build-up] | [complete build-up] | [processor/material/mark delta] | [glass/façade] |
| Hardware/locks | [part/revision/interfaces] | [current parts] | [functional/interface delta] | [hardware/security] |
| Seals/chemicals | [profiles/products/contacts] | [current set] | [compatibility/adhesion delta] | [manufacturers/designer] |
| Labels/evidence | [old route] | [current requirement/records] | [scope/version delta] | [compliance owner] |
4. Approve visual matching and functional interchangeability separately
Colour name is not appearance control. Compare retained approved sample and representative weathered installed units with new physical samples under project-approved viewing/measurement conditions, recognising ageing, dirt, orientation, metamerism, gloss/texture and substrate/process differences. ISO/CIE 11664-4 defines a CIE colour-space method and ASTM D2244 addresses instrumental colour differences; neither chooses an acceptance tolerance or promises adjacent visual match.
Establish batch/sample stages: supplier chip or laboratory panel, production-representative profile/sample, first-off or assembled sample and delivery batch check as approved. Record instrument/geometry/lighting where used, physical sample identities, observers and actual results. Instrument values and visual approval answer related but different questions. A new item may match the old retained sample yet contrast with aged façade units.
Treat interchangeability as engineering/configuration change. For a replacement handle, roller, lock, gasket, sash or IGU, verify geometry, loads/operating forces, machining/fixing, connected parts, material/contact/corrosion, safety/security/access/fire/egress functions, drainage/sealing, maintenance and current evidence. A trial fit can expose conflicts but cannot approve capacity, durability or certification by itself.
| Question | Representative evidence | Required authority | Limit |
|---|---|---|---|
| Colour/process match | Original sample + installed context + new production sample | Architect/owner/coating parties | No universal tolerance |
| Gloss/texture | Controlled physical viewing/measurement | Named visual authority | Screen image excluded |
| Batch consistency | Approved production inspection plan | QA/finish owner | Sample scope only |
| Hardware fit/function | Interface comparison + representative trial | System/hardware/security designer | Fit is not full approval |
| Seal/gasket compatibility | Profile/compound/contact and system evidence | Manufacturers/designer | Appearance insufficient |
| Performance/regulatory | Current configuration-specific evidence | Responsible professionals/AHJ | Old approval not inherited |
5. Release a new baseline and prevent mixed-batch ambiguity
Assemble the repeat-order dossier: original as-built baseline and confidence gaps; current requirement register; complete proposed BOM; old/new delta matrix; supplier/manufacturer change and lifecycle statements; current declarations/test/certification evidence where required; colour/finish samples; hardware/seal/glass compatibility and functional reviews; prototype/first-off and inspection/test plan; commercial/programme effects; and authorised decisions. Open fields prevent production release.
Issue new drawings, schedules, BOM, samples, labels, inspection criteria and configuration revision. Do not overwrite the original project archive. Link new-to-old relationships, effective marks/quantities and accepted differences. Segregate old spares, leftover components and new production unless interchangeability is authorised; labels and packaging must make the batch/configuration traceable at receiving and installation.
At first-off and delivery, verify the physical product to the new baseline, not the phrase repeat order. Trigger review for supplier, formulation, batch, component revision, standard/regulatory change, test-report scope, sample mismatch, site/interface change or unauthorised substitute. Handover the new as-built baseline and parts/lifecycle implications. A repeat purchase is complete only when the new configuration is verified and archived.
| Gate | Required evidence | Fail-closed state | Authority/status |
|---|---|---|---|
| Original baseline | As-built configuration and confidence | Tender/assumed baseline only | [archive owner] |
| Current requirements | Destination/project register | Edition/scope unknown | [professionals] |
| Configuration delta | Field-by-field BOM/interface evidence | ‘Same as before’ | [technical owners] |
| Appearance/function | Physical samples and interchangeability review | Code/fit assertion only | [approval authorities] |
| First-off/quality | New baseline ITP and actual results | Old batch acceptance reused | [QA] |
| Archive/handover | New revision, marks, batches and changes | Original overwritten/mixed stock | [configuration owner] |
FAQ
Can the purchase order say ‘same as previous order’?
It can express intent but is not a production specification. Attach the recovered as-built baseline, current requirements, complete proposed configuration and authorised delta record.
Does the same RAL code guarantee a visual match?
No. Process, product, substrate, gloss/texture, batch, viewing conditions and ageing matter. Approve representative physical evidence under project-defined criteria.
Can an updated handle replace a discontinued original if the holes align?
Not automatically. Verify load/function, machining, connected parts, materials, safety/security/accessibility, maintenance and current system evidence.
May old test reports be reused?
Only after authorised review of current method/edition, report scope, manufacturer/site, specimen and proposed configuration plus destination transition rules. No automatic carry-over is implied.
Should the old approved sample control forever?
No. Preserve it as historical evidence and assess its condition, then establish a new order-specific approval using current production-representative samples and installed context.
Can old and new parts be mixed during installation?
Only under a controlled, approved configuration. Segregate by default so unreviewed combinations do not enter the project.
What must be archived after the repeat order?
The new governing basis, released BOM/drawings, samples/batches, evidence, first-off/inspection results, accepted differences, installed marks and lifecycle/parts implications linked to—but not overwriting—the original archive.
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 — ISO 10007 configuration management guidance ↗ISO — ISO 9001 quality management systems ↗ISO/CIE — ISO 11664-4 CIE colour space ↗ASTM International — ASTM D2244 calculation of color tolerances and color differences ↗FGIA — AAMA 2604 high-performance organic coatings ↗FGIA — AAMA 2605 superior-performing organic coatings ↗European Commission — Construction Products Regulation overview ↗Related buyer guides
This article is not a repeat-order approval, colour-match guarantee, interchangeability conclusion, product specification, standards/legal analysis, performance claim, warranty or Cavorlen availability statement. It supplies no colour tolerance, gloss range, material property, hardware equivalence, glass build-up, sampling plan, acceptance value, lead time, price or minimum order. Current project professionals, manufacturers, test/certification bodies where applicable, authorities and authorised commercial parties must approve the exact new order and differences.