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UK Whole Life Carbon Map

Where every UK whole life carbon standard, rule and target sits, who can make it a requirement on your project, and how the pieces connect. Built from the primary documents and checked against official and trade sources on 25 October 2026.

Drawing
WLC-000
Rev
B
Facts checked
25 Oct 2026
Scale
NTS
Prepared by
Welscape
Next review
Feb 2027

Regulation

Nationally, embodied carbon is still unregulated.

Part L covers operational energy only. In July 2025 the government was still "assessing the evidence". Mandatory WLCAs come from London planning, a few councils and public-sector clients.

Method

One method sits under almost everything.

The RICS PS 2nd edition, built on EN 15978, is what the GLA, NZCBS, BREEAM V7, LETI, the NHS and NISTA point to. Build one compliant model and report it several ways.

Comparability

Numbers only compare when scopes match.

Modules, elements, floor area, sequestration and year all move the figure. A LETI band, a GLA benchmark and an NZCBS limit measure different things.

Claims

"Net zero" now has a referee.

NZCBS verification opened in July 2026, with claims only after a year in use. The CMA has been able to fine misleading green claims since April 2025.

Key Law or planning policy Required by a client or funder Voluntary, market-led Method, standard or data: binding only when invoked Proposed or in draft Circular economy

Section A-A

How the pieces stack

Read it from the bottom up: international standards feed the UK methods, the methods feed the targets, and the top row is everyone who can make it a requirement on your project. Pick a box to see what it is, whether it's mandatory, and what it connects to.

Lines show the links of the selected box; numbers match the list in the panel. written into the documents informal overlap (Welscape's reading)

Schedule 1

Is it mandatory? It depends who's asking

The same building can face no carbon rules at all, or three sets of them, depending on where it is and who is paying. Symbol colour shows who imposes the requirement.

● required◐ expected, conditional or partial○ not requiredScotland, Wales and Northern Ireland were not covered in this check.

Schedule 2

Same words, different numbers

Why a LETI band, a GLA benchmark and an NZCBS limit can't be compared directly: each one counts different life cycle modules and building elements.

● counted in the headline figure◇ reported separately, not in the figure◐ partlyblank: not coveredB8 (user activities) is optional in the RICS PS and not shown.

Rule

Build the model once, to the full RICS scope, then filter it for each scheme. Never carry a number from one scheme into another without re-cutting the scope. Welscape view

Detail 1

Client brief builder

Answer four questions about your project to see what's required by law or planning, what your own choices add, and the approach Welscape recommends. An example is loaded; change any answer.

Where is the site?
What's being built?
Who's the client?
What do they want?

A starting checklist, not a compliance opinion. Confirm against the current documents and the local authority before scoping.

Programme

When each one bites

RIBA Plan of Work stages across the top. Most of the carbon is decided before most schemes ask for a number.

PAS 2080 stage mapping is approximate, following RICS PS Table 1. Bars show when each scheme asks for something, not how long the work takes.

Detail 3

Circular economy: the sister system

Circular economy has its own rules, but it shows up in the carbon numbers in specific places. This is where, and which circular rules can actually be forced on a client.

PREFER (WASTE HIERARCHY) WHERE IT LANDS (RICS PS MODULES) 1 Retain and retrofitTypically the lowest-carbon option (GLA) 2 Reuse materials on siteRecovered from strip-out or demolition 3 Reuse elsewhere, design for disassemblyThe benefit lands in someone else's project 4 RecycleKeeps some of the material's value 5 DisposeLandfill or incineration A5.1Pre-construction demolition A1-A3New products and materials D1Beyond the boundary, reported separately C3Waste processing C4Disposal less of avoids new cuts credited in adds net benefit adds
Where each circular choice lands in a RICS PS assessment. Retained elements carry no new A1-A5 (PS 3.3); demolition and strip-out go in A5.1 (PS 3.2, 3.3); materials reused elsewhere show their benefit in D1, which is reported separately and never netted off the total (PS 3.2; GLA guidance 3.2.13).

Can be made a requirement

  • Waste law, everywhere: waste hierarchy and duty of care.
  • GLA Circular Economy Statement (SI 7) on referable London schemes.
  • Westminster Policy 43 Retrofit first (adopted Jan 2026).
  • City of London WLC optioneering advice note (2023) for majors and major demolition.

Voluntary

  • BREEAM waste and materials issues (check the V7 manual for numbering).
  • BS 8001:2017 and ISO 59004 / 59010 / 59020 (2024).
  • LETI's Circular Economy one-pager (2022) and Retrofit vs Rebuild Unpicker (2023).
  • EU Level(s) circularity indicators General knowledge, not re-checked

Shared data

The bill of materials is one dataset serving two submissions. In London, modules C3 and D of the WLCA are meant to come from the Circular Economy Statement (GLA guidance 3.2.2).

PAS 2080 order of play

AvoidRetain, reuse, or question the need to build
SwitchDifferent structure, materials or technology
ImproveEfficiency and design for future reuse

PAS 2080:2023 clause 4.3: apply in that order. Circular economy sits in "improve"; retaining an existing building is an "avoid" move.

Case

M&S Oxford Street. Called in and refused in July 2023, with retrofit and carbon central to the inquiry Moderate confidence. The High Court quashed that refusal in early 2024, and on 5 Dec 2024 the Secretary of State approved demolition, saying she did "not consider that it is possible to come to a definitive conclusion" on whether refurbishment would have less embodied carbon. Carbon only wins the argument when the retain vs rebuild comparison is early, like-for-like and robust.

Revisions

What's changing

The dates that move this map, 2023 to 2030. Proposed or EU-only items have dashed outlines.

References

Sources and confidence

Facts come from the documents themselves or from web sources checked on 25 Oct 2026. Anything that is Welscape's judgement or an interpretation is tagged where it appears.

Document reviewed read directly Web, 25 Oct 2026 checked online on that date Welscape view Welscape's judgement Moderate confidence secondary source or summary Interpretation goes beyond what a source says Not verified not confirmed for this edition General knowledge, not re-checked

Next step

Got a carbon target and not sure which of these applies?

Welscape helps contractors, developers and design teams work out what is actually required on a project, what is worth doing anyway, and when to start. Send the site location, the RIBA stage and what the client wants to achieve.

Contact Welscape
Prepared by Welscape. Facts checked 25 October 2026; next review due February 2027. General information only, not legal or professional advice for any specific project. Check the current official documents and the local planning authority before relying on anything here. If this map and those documents disagree, the documents win.