Quick Answer
The EU's 2026 life-cycle global-warming-potential framework is a reason for window and door suppliers to improve document control now. It is not proof that every product has an EPD, a verified carbon value or a single Europe-wide submission format. A useful project file identifies the exact system, records the requested evidence, states the boundary and version, and leaves calculation and compliance conclusions to the responsible project process.
What changed in 2026 - and what did not
On 4 May 2026, the European Commission published a framework for Member States to calculate the life-cycle global warming potential (GWP) of new buildings under the recast Energy Performance of Buildings Directive (EPBD). The Commission says the framework is intended to improve comparability while allowing national specificities.
The published timetable points to calculation and disclosure for new buildings with more than 1,000 m² of useful floor area from January 2028, and for all new buildings from January 2030. Those dates do not mean that every European project today requests the same supplier form or that a generic product brochure is sufficient. The applicable national method, tender, assessment boundary and client requirements still need to be confirmed.
For window, door, glazing and hardware suppliers, the practical opportunity is simple: make it easier for a project team to understand what product was quoted, what evidence exists, and what remains unverified.
The evidence hierarchy buyers should use
| Evidence level | What it can show | What it cannot prove by itself |
|---|---|---|
| Marketing statement | A supplier's general position or intended product category | A verified product carbon value, recycled content, EPD or project compliance |
| Product identity record | Exact series, profile, size range, glass build-up, hardware, finish and drawing revision | The final installed configuration or a life-cycle result |
| Supplier source documents | Available material declarations, manufacturing records, third-party documents or component data | That every document applies to the quoted system, project boundary or local method |
| Project calculation input | A controlled input package for the project's appointed assessor or design team | An approved building-level GWP calculation unless the responsible process confirms it |
| Verified project evidence | Evidence reviewed against the applicable tender and national method | A transferable claim for all projects or markets |
This hierarchy keeps a common problem out of the RFQ stage: treating a sustainability statement as if it were a project submittal. It also helps buyers compare suppliers fairly. One supplier may have a useful document but a different glass configuration; another may quote the right frame series but leave the hardware or finish undefined. Neither file is ready for a reliable comparison until the configuration is controlled.
A window and door supplier document checklist
Ask each supplier to prepare a named, dated package rather than a folder of disconnected PDFs.
1. Define the quoted system
Record the system name or series, product type, opening arrangement, reference drawing, dimensions or size range, glass build-up, hardware set, seal/gasket assumptions, finish, accessories and packaging scope. If a line item can change after quotation, flag it.
2. Preserve the project boundary
State the project name, country, intended building use, tender revision, requesting party and the document purpose. A file prepared for an early budget quotation should not be presented as evidence for an approved construction package.
3. Separate available evidence from requested evidence
Create two lists: documents already supplied and documents still requested by the project. For every item, show its owner, issue date, product/configuration scope and verification status. This makes gaps visible before award rather than after fabrication.
4. Control substitutions
Changes in glass, aluminium profile, hardware, finish, spacer, thermal-break component or supplier can affect both technical and environmental documentation. Record proposed substitutions, the reason for change, who approved them and which documents need revision.
5. Give the project team usable inputs
Where the tender requests life-cycle information, provide the available documents in the requested format and identify any assumptions. The architect, consultant, client or appointed assessor should determine whether the input is sufficient for the project's national methodology and building-level calculation.
What not to claim before verification
Do not make any of the following claims unless project-specific evidence has been reviewed and approved:
- "This window has a verified EU carbon value."
- "This product has an EPD" or a particular recycled-content percentage.
- "This configuration meets the project's life-cycle-carbon target."
- "This data is accepted in every EU country."
- "The quoted product will produce a particular building-level GWP result."
For SGL specifically, EPD availability, carbon figures, material origins, recycled-content figures, lifecycle calculations, third-party verification and country acceptance are all requires validation unless current source documents are supplied and checked against the final project configuration.
Questions buyers should answer before releasing an RFQ
- Which country and project method apply, and who is responsible for the building-level calculation?
- Is the request for a budget comparison, tender submittal or final approved configuration?
- Which components are inside the requested scope: frames, glass, hardware, shading interfaces, packaging, transport or installation?
- Which document types, language, format, version and third-party review are required?
- How will substitution, evidence gaps and late design changes be approved?
These questions are often more valuable than asking a supplier for a single "green" label. They give the supplier a defined job and give the project team a transparent audit trail.
How SGL can support a controlled inquiry
For an international aluminium-window or door enquiry, SGL can begin by reviewing the drawings, sizes, glass options, finishes, hardware choices and project requirements described on its aluminum windows and
customization support pages.
To start the documentation conversation, send SGL the project location, tender revision, schedule, configuration assumptions and the client's requested evidence list through the contact page. Do not treat an initial response as a verified environmental declaration or a guarantee of local acceptance. Final product data and any project submission must be reviewed against confirmed source documents and the applicable project process.
FAQ
Does the 2026 EU framework mean every window needs an EPD today?
No. The EU framework concerns calculation of a building's life-cycle GWP and leaves national implementation details relevant. Project requirements vary. Buyers should ask what evidence their specific tender and national method require instead of assuming one document works everywhere.
Can a supplier calculate the building's full life-cycle carbon result?
Not from a standard quotation alone. A supplier may provide approved product data or controlled inputs where available, but a building-level result depends on the project's calculation method, boundary, construction information and responsible assessor.
Why should glass and hardware be named in a carbon-document request?
Because a window or door is an assembly. A change in glazing, hardware, dimensions, finish or profile can change the quoted configuration and may change which evidence is relevant. Naming the assembly is essential for a traceable submission.
External Sources and Notes
- European Commission, 4 May 2026: life-cycle GWP calculation framework
- European Commission: life-cycle global warming potential under the EPBD
- European Commission: EPBD overview
Editorial note: This article provides a procurement-documentation framework, not an environmental-product declaration, lifecycle assessment, legal interpretation or certification opinion. Confirm project-specific evidence, national method and final product configuration before publishing any environmental performance claim.
