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Embodied carbon is the greenhouse-gas emissions and removals associated with building materials and construction over their life cycle. It covers extracting and manufacturing products, transporting and installing them, maintaining and replacing them, and eventually demolishing, deconstructing, processing and disposing of them. Building reuse reduces embodied carbon when retaining an existing structure or component avoids some of those new-material and construction impacts. The saving is not automatic: a fair comparison must use the same building function, study period and whole-life boundaries, and must include both embodied and operational effects.
This distinction matters because a building can have low energy use in operation yet carry substantial emissions from its materials, or retain a structure but require so much new work that the carbon advantage narrows. A project-level whole-life carbon assessment shows which outcome applies.
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What embodied carbon means
Embodied carbon is the climate impact tied to a building’s physical fabric and the processes that create, install, maintain and remove it. “Carbon” is shorthand for greenhouse gases expressed as carbon-dioxide equivalent (CO2e), not only carbon dioxide. Depending on the assessment method, the accounting can include emissions and removals from raw-material extraction, manufacturing, transport, construction, maintenance, repair, replacement, refurbishment, demolition or deconstruction, waste treatment and disposal.
Operational carbon is accounted for separately. It is mainly the emissions associated with energy used while the building is occupied, with some methods also accounting for operational water. The Royal Institution of Chartered Surveyors (RICS) describes operational, embodied and user carbon as parts of whole-life carbon (WLC). User carbon can include activities such as commuting or road traffic where they are relevant to the assessment. A decision about reuse therefore should not compare only the carbon in new materials; it should compare the complete life-cycle result.
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Why the issue is material
RICS cites a 2022 United Nations Environment Programme estimate that the built environment, including buildings and infrastructure, was responsible for more than 40% of global greenhouse-gas emissions. In the same source, UNEP estimated that embodied carbon represented 15% of global CO2 emissions in 2021 and operational carbon 22%. Those are global sector estimates for 2021 cited in a 2022 publication; the 15% figure is not a forecast or a guaranteed share for an individual building.
How life-cycle carbon is organised
World Green Building Council guidance based on EN 15978 uses modules A through D. The modules prevent a project from hiding impacts in an unexamined stage and make reuse options comparable.
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|---|---|---|
| A1–A3: product stage | Raw-material supply, transport to the manufacturer and manufacturing. | New concrete, steel, timber, insulation, finishes and services have these impacts. Retained elements do not bring their original manufacture into the current project assessment. |
| A4–A5: construction stage | Transport to the site and construction or installation activities. | Account for deliveries, plant, site energy, installation and waste generated while fitting new work. Less replacement can reduce these activities. |
| B1–B5: use-stage embodied impacts | Use, maintenance, repair, replacement and refurbishment. | Retained structure and components still have future maintenance, repair, replacement and eventual refurbishment impacts. New components add their own service-life impacts. |
| B6: operational energy | Energy used during operation. | Reported separately from embodied modules. A retained building may need insulation, glazing or services upgrades to achieve acceptable operational performance. |
| B7: operational water | Water use during operation where the method includes it. | Include changes in water demand caused by a new use or upgraded systems. |
| C1–C4: end of life | Deconstruction or demolition, transport, waste processing and disposal. | Strip-out or demolition enabling a retrofit belongs here or in the applicable pre-construction accounting, while future end-of-life work remains part of the study period. |
| D: benefits and loads beyond the boundary | Potential effects from recovered materials, recycling or exported energy outside the assessed building system. | Report reuse or recycling benefits separately in module D; do not use them to make A–C impacts appear smaller. |
RICS guidance treats demolition or strip-out needed to enable retrofit as pre-construction work and places recovery or reuse benefits in module D1. This separation avoids claiming a future, uncertain recycling benefit as though it were an immediate project reduction.
How building reuse can reduce embodied carbon
Retaining the structure and major components
Keeping foundations, frames, floor slabs, roofs, stairs, façades or services can avoid manufacturing equivalent replacement products. That can reduce A1–A3 emissions and the associated A4 transport and A5 installation work. The avoided impact is limited to what would actually have been replaced in the new-build alternative; retaining a frame does not automatically avoid every other material package.
Reducing demolition and waste
A refurbishment that requires less demolition or deconstruction can avoid some demolition plant, transport, waste processing and disposal. It can also reduce disruption and the quantity of material that must be handled before the renewed building is occupied. Strip-out still has an impact, so it must be measured rather than assumed to be negligible.
Adapting an existing building to a new use
The U.S. Environmental Protection Agency describes adaptive reuse as redesigning an existing building for a different function. It says this approach can preserve a neighbourhood’s historical and social fabric while creating new opportunities for use, and identifies renovation as an alternative to site redevelopment that can reduce greenhouse-gas emissions and waste. The carbon outcome depends on the amount of new work needed to meet the new brief, code, accessibility and performance requirements.
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Using recovered materials
Components removed from one project may be reused or recycled in another. When the benefit occurs beyond the assessed system boundary, WorldGBC and RICS require it to be reported in module D rather than folded into modules A–C. State the quality, destination and likelihood of recovery; a theoretical future use is not the same as a verified reuse pathway.
Why reuse is not an automatic carbon win
RICS states that reuse and refurbishment are often the most efficient approach in terms of WLCA
because they minimise the need for new materials and demolition waste. “Often” is important. A deteriorated building may need extensive strengthening, a new envelope, replacement services and hazardous-material removal. A new building may then use substantially less operational energy over the study period. Conversely, a sound structure with a modest fit-out can preserve a large amount of existing material. Only a consistent comparison can show which effect dominates.
How to compare reuse or refurbishment with new build
- Define the same functional requirement. Specify floor area, capacity, use, accessibility, fire performance, comfort and expected service level for both options. Comparing a lightly occupied shell with a fully serviced building produces a misleading result.
- Set one reference study period. Use the same assessment duration, service-life assumptions and end-of-life date for reuse and new build. Document any uncertainty around component lives.
- Map what is retained, removed and added. Record structure, envelope, internal partitions, finishes, mechanical and electrical systems, lifts, plant and site works. Identify every element that the new-build baseline would provide.
- Quantify product and construction impacts. Measure quantities and specifications for new materials, then include manufacturing, transport, installation, site energy and construction waste. Include demolition or strip-out required to enable the reuse option.
- Model use-stage impacts. Include maintenance, repair, replacement and refurbishment for retained and new elements. Model operational energy and water as separate modules, using the same occupancy and climate assumptions for both options.
- Account for end of life. Include deconstruction or demolition, transport, waste treatment and disposal for the reference period. List recovered-material or exported-energy effects separately in module D.
- Check the functional and time basis. Compare results on a consistent floor-area or functional-unit basis, state the study period, and show assumptions and uncertainty. A single headline number without these details is not a reliable decision.
| Comparison question | What to document |
|---|---|
| Scope and retained fabric | Which structure, envelope, services and other components remain; which are removed, repaired or added. |
| New-material demand | Material quantities, product specifications, sourcing, manufacturing, transport and installation. |
| Enabling work | Strip-out, demolition, temporary works, access, site plant and construction waste. |
| Use stage | Maintenance, repairs, replacements, refurbishments, operational energy and operational water over the study period. |
| End of life | Demolition or deconstruction, transport, processing, disposal and documented recovery routes. |
| Functional basis | Equivalent use, capacity, floor-area basis, assessment period, assumptions and uncertainty. |
What happens to retained elements in the assessment?
The original manufacture of an existing wall, frame or slab is normally outside the current retrofit project boundary, so it is not counted again as a new A1–A3 burden. That does not make the element impact-free. Its future maintenance, repair, replacement, refurbishment and eventual end-of-life impacts remain relevant. If a retained façade needs replacement glazing every 20 years, those future replacements belong in the use-stage model.
New work added during the retrofit starts with its own product-stage impacts and continues through transport, installation, maintenance and end of life. A project that retains a frame but replaces all cladding, windows, services and finishes may have a very different result from one that retains those components as well.
A practical workflow for a reuse decision
1. Survey before designing
Establish the condition, dimensions, materials, serviceability and remaining life of existing elements. Record unknowns and test them; assumptions about a hidden structure or contaminated material can change both scope and carbon.
2. Create a retention schedule
Mark each element as retain, repair, adapt, replace or remove. Tie every decision to a performance requirement, not to a blanket preference for keeping or discarding material.
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3. Build a new-build baseline
Describe the notional replacement building with the same function, floor area, quality and study period. Without this counterfactual, “avoided carbon” has no defined meaning.
4. Quantify both options
Use consistent quantities, product data, transport assumptions, construction processes, maintenance schedules and end-of-life scenarios. Keep operational energy in its own module so efficiency measures can be seen without obscuring embodied results.
5. Test sensitivities
Vary uncertain factors such as remaining service life, replacement cycles, energy performance, material quantities and recovery rates. Report which assumptions drive the conclusion rather than presenting false precision.
6. Make the decision transparent
Present A–C results, module D separately, operational results and the functional basis. Explain costs, programme, heritage, safety and regulatory constraints alongside carbon; carbon is one decision criterion, not a substitute for a safe and compliant design.
Common mistakes and how to avoid them
- Quoting a universal saving percentage. No project-specific percentage is established by the available standards and guidance. Savings vary with condition, retained scope, new work, baseline, study period and operational performance.
- Counting only upfront materials. A1–A3 alone omits transport, installation, maintenance, replacements, demolition and disposal. Use the full relevant life-cycle modules.
- Ignoring operational performance. A retained envelope or plant system may require upgrades; compare operational energy and water over the same period as embodied impacts.
- Double-counting recycling. Keep benefits or loads beyond the system boundary in module D instead of subtracting them from A–C.
- Comparing unlike buildings. Match function, capacity, floor area, comfort, compliance and service life before comparing totals.
- Treating uncertain recovery as guaranteed. Document whether a component has a real purchaser, specification and logistics plan; otherwise model a conservative scenario and disclose the uncertainty.
Standards and policy context
RICS’s second-edition Whole Life Carbon Assessment standard took full effect for RICS members on 1 July 2024. It is a professional standard for consistent assessment, not a statement that every project in every jurisdiction is legally required to use it.
WorldGBC’s December 2024 briefing describes revised European Union Energy Performance of Buildings Directive provisions for life-cycle global-warming-potential disclosure. The briefing gives 2028 for new buildings over 1,000 m² and 2030 for all new buildings, and says member states must transpose the provisions into national frameworks by May 2026. These are EU milestones described in that dated briefing, not universal rules; verify the national requirements that apply to a particular project.
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Examples of how the decision can differ
Office conversion to housing
Retaining a sound frame and floor slabs may avoid major new structural products, while new kitchens, bathrooms, fire upgrades, acoustic treatments and services create substantial additions. The assessment should include those additions, the strip-out and the operational energy expected from the converted building.
Façade retention with a new interior
Keeping a historic façade can avoid replacement masonry or cladding, but temporary works, specialist repair, new windows and a completely new interior still have product and construction impacts. Any heritage or social value is important to the project decision but should not be presented as a quantified carbon saving unless it is measured within the chosen method.
Partial demolition and extension
An extension can retain the most serviceable portion of a building while adding new structure and envelope. Compare that hybrid option with both full refurbishment and a replacement building, using identical functional requirements and end-of-life assumptions.
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Bottom line
Embodied carbon is the life-cycle impact of making, moving, installing, maintaining, replacing and removing building materials and construction work. Reuse can reduce it by retaining existing fabric, avoiding some new production and limiting demolition waste, while adaptive reuse can meet a new need without redeveloping an entire site. The defensible answer for any project comes from a transparent whole-life comparison of reuse and new build, with operational energy and water assessed alongside embodied modules and module D benefits reported separately.
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