Carbon calculations | Sustain Surveying

CARBON

Understanding and Reducing Carbon Across the Built Asset Lifecycle

Reducing greenhouse gas emissions is one of the central challenges facing the built environment.

Buildings and infrastructure generate carbon emissions throughout their lifecycle — from the extraction and manufacture of materials, through construction and operation, to maintenance, refurbishment and eventual demolition, reuse or disposal.

Understanding these emissions provides an important basis for making better decisions about the design, construction, management and adaptation of built assets.

Carbon and Surveying

Surveyors have an important role in helping the built environment understand, measure and reduce carbon emissions.

Decisions concerning materials, cost, procurement, construction, energy use, maintenance, refurbishment, valuation and asset management can all influence the carbon performance of buildings and infrastructure.

RICS has developed a comprehensive professional framework for this through its Whole life carbon assessment for the built environment professional standard.

The second edition provides a consistent methodology for measuring carbon emissions throughout the lifecycle of buildings and infrastructure and covers embodied, operational and user carbon. The standard has been effective since 1 July 2024.

RICS - Whole life carbon assessment for the built environment

Whole Life Carbon

A whole-life approach recognises that the carbon impact of a building extends well beyond the energy consumed during its occupation.

RICS's Whole Life Carbon Assessment methodology considers emissions across the lifecycle of a built asset, including:

extraction and manufacture of materials
transportation
construction and installation
operation and energy use
maintenance, repair and replacement
refurbishment
deconstruction and demolition
waste processing and disposal
opportunities for reuse, recycling and recovery.

This broader perspective helps avoid shifting carbon impacts from one stage of an asset's life to another and allows different options to be considered on a more consistent basis.

Embodied and Operational Carbon

Two particularly important components of whole-life carbon are embodied carbon and operational carbon.

Embodied carbon relates to emissions associated with materials and construction processes. This includes extracting raw materials, manufacturing products, transportation and construction, as well as emissions associated with maintenance, replacement and end-of-life processes.

Operational carbon relates principally to emissions arising from energy consumed during the operation of a building or asset.

Historically, much of the emphasis within the built environment has been placed on operational energy. As buildings become more energy efficient and energy systems decarbonise, understanding embodied carbon becomes increasingly important.

A whole-life approach allows these different sources of emissions to be considered together.

Carbon and Decision-Making

Carbon assessment is most useful when it informs decisions rather than simply recording emissions.

Considering carbon early in the development or asset-management process can help identify opportunities to reduce emissions while there is still significant scope to influence outcomes.

This might involve considering whether an existing building can be retained or adapted; comparing materials and construction approaches; improving energy performance; extending asset life; reducing waste; or considering opportunities for reuse and circularity.

RICS's methodology is designed not simply to measure emissions but to help manage carbon budgets, compare options and support carbon reduction across the built asset lifecycle.

Retrofit, Reuse and the Circular Economy

Reducing carbon does not necessarily mean replacing existing buildings with new, more energy-efficient ones.

Existing buildings contain significant quantities of carbon associated with the materials and energy used in their original construction. Decisions about refurbishment, retrofit, adaptation, demolition and replacement therefore need to consider both operational performance and embodied impacts.

Extending the useful life of buildings and components, reducing demand for new materials and increasing reuse and recycling can connect carbon reduction with resource efficiency and circular-economy principles.

The current RICS Whole Life Carbon Assessment standard specifically incorporates guidance relating to retrofit and circular-economy approaches.

Carbon and Sustainability

Carbon reduction is an essential component of sustainable development, but carbon should not always be considered in isolation.

Decisions intended to reduce emissions may also have implications for cost, natural resources, biodiversity, health and wellbeing, resilience, heritage and social value.

RICS's 2026 Sustainability practice for surveyors places climate-change mitigation alongside adaptation and resilience, biodiversity, resource use and wider social and economic considerations.

A sustainability perspective therefore considers carbon within the wider context of the property, project, organisation and decisions being made.

RICS - Sustainability practice for surveyors

Sustain Surveying and Carbon

Sustain Surveying provides independent professional analysis and advice on carbon and sustainability considerations affecting land, property, construction and development.

Our approach brings together surveying expertise, sustainability research, RICS standards and guidance, policy and wider professional evidence to help clients understand carbon-related issues relevant to a particular property, project or decision.

Advice may include identifying carbon considerations; reviewing available carbon and sustainability information; considering embodied and operational carbon implications; exploring relationships between carbon, retrofit, materials and circularity; interpreting relevant RICS standards and professional guidance; and considering carbon within wider sustainability decision-making.

Where an instruction requires a formal Whole Life Carbon Assessment, detailed energy modelling, lifecycle assessment, engineering analysis or another specialist technical calculation, the need for appropriately competent specialist input will be identified.

Discuss a Carbon or Decarbonisation Issue

If you would like to discuss carbon or decarbonisation considerations affecting a building, development, construction project, property portfolio or organisation, please contact Sustain Surveying.

Professional advice can be provided for a defined project or instruction, with the scope and fee agreed in advance.