Embodied Carbon Reports for Buildings

In Brief

What Is Embodied Carbon Reporting?

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Use this guide to explore the practical foundations of embodied carbon in buildings, from material impacts and construction systems to reporting pathways and reduction opportunities.

For deeper background, read what embodied carbon means in buildings, what is included in an Embodied Carbon Report and how embodied carbon differs from operational carbon.

Embodied carbon is the greenhouse gas emissions associated with the materials, products and construction processes used to create a building. It is the carbon impact connected to the physical building before it becomes occupied and operational.

In a building project, embodied carbon can be linked to raw material extraction, product manufacturing, transport, construction, installation, replacement, demolition and disposal. The exact scope depends on the type of assessment being carried out and the information available at the time. This is why the scope of what is included in an Embodied Carbon Report needs to be understood clearly at the start of a project.

For project teams, embodied carbon is most useful when it is understood through real building decisions. Concrete, steel and timber, aluminium, glass, insulation, plasterboard, façade systems, finishes and structural systems can all influence the carbon profile of a project.

The purpose of embodied carbon reporting is not only to produce a carbon number. It is to help project teams understand where carbon is concentrated in the building and where lower-carbon material decisions may be possible.

An Embodied Carbon Report is a project-specific assessment that estimates the carbon impact of selected building materials, products and construction systems. It helps project teams understand where embodied carbon is concentrated and which decisions may influence the result.

The report usually draws on project documentation such as architectural drawings, structural information, material schedules, specifications, quantities, Environmental Product Declarations and recognised emissions factors. The level of detail depends on the project stage, available information and reporting purpose. For a practical project checklist, see what information is needed for an Embodied Carbon Report.

A useful report should do more than list a carbon total. It should make the carbon profile understandable, show the main contributors and support better decisions before material, structural or procurement choices are locked in. Project teams may also need to consider report cost and assessment timing when planning the work.

What an Embodied Carbon Report may include

For many projects, this means reviewing the role of concrete, steel, timber, façade systems, insulation, finishes and structural systems, then identifying where lower-carbon alternatives or design refinements may be worth considering.

Embodied carbon and operational carbon describe different parts of a building’s carbon impact. Both are important, but they are influenced by different decisions and occur at different stages of a building’s life.

Embodied carbon relates to the materials, products and construction processes required to create the building. It is shaped by decisions such as structure, concrete, steel, timber, façade systems, insulation, finishes, procurement and construction methods.

Operational carbon relates to the energy a building uses during occupation. This includes heating, cooling, lighting, ventilation, equipment, appliances and other energy uses over time.

Historically, building performance conversations often focused on operational energy. This remains important, especially for compliance and performance pathways such as Section J, JV3 Assessment, NatHERS and NABERS operational ratings.

As buildings become more efficient to operate, the carbon associated with materials and construction becomes more visible. A strong building performance strategy considers both how a building is made and how it performs over time, including opportunities for lower embodied carbon material choices.

Embodied carbon is not created by one material, product or construction activity. It is spread across the building supply chain, from raw material extraction and manufacturing through to transport, installation, replacement and end-of-life outcomes.

In an Embodied Carbon Report, these sources are reviewed against the project scope and the information available. Some reports focus mainly on upfront carbon before occupation, while broader assessments may consider replacement, maintenance, demolition, disposal or reuse. This is why it is important to understand what is included in an Embodied Carbon Report and how the reporting boundary compares with a broader Life Cycle Assessment.

Understanding where embodied carbon comes from helps project teams see which decisions are most influential. For many buildings, the largest opportunities are connected to structure, façade, material quantities, procurement pathways and product-specific data.

Embodied carbon is closely connected to the way a building is assembled. The same building function can often be achieved through different material choices, structural systems, façade approaches and construction methods, each with a different carbon profile.

An Embodied Carbon Report helps identify which materials and systems are most influential for a specific project. In some buildings, the largest contributors may be structure and concrete. In others, façade systems, steel, aluminium, glazing, insulation, finishes or repeated fitout cycles may become more important. For a broader overview of common material choices, see concrete, steel and timber embodied carbon.

The aim is not to treat one material as always good or bad. The right decision depends on quantity, performance, durability, sourcing, structural role, replacement cycle and how the material works within the building as a whole.

This is why embodied carbon reporting is most useful when it is connected to real project information. The carbon profile of a building is not only a materials list. It is the result of design, quantity, specification, construction method and long-term performance working together. For project teams preparing an assessment, it also helps to understand what information is needed for an Embodied Carbon Report and where lower embodied carbon material choices may be worth reviewing.

Embodied carbon should ideally be reviewed before major design, structural and material decisions are finalised. The earlier a project team understands where carbon is likely to sit, the more opportunity there is to reduce impact without causing late redesign or procurement pressure.

A review can still be useful later in the project, but the type of value changes. Early reporting can support design decisions. Later reporting may be more focused on documenting the carbon profile, improving product data or identifying remaining opportunities within the specification. For planning purposes, it can help to understand how long an Embodied Carbon Report may take.

The right timing depends on the project purpose. A concept-stage review may focus on structural systems and material direction. A design-development review may compare options in more detail. A later report may rely on more complete schedules, quantities and product information, which is why project teams should also understand what information is needed for an Embodied Carbon Report.

For projects connected to formal pathways such as NABERS Embodied Emissions, Green Star or ISCA, timing should also consider the documentation and submission requirements of the relevant framework. For comparison, see Embodied Carbon Report vs NABERS Embodied Carbon and how embodied carbon fits into Green Star projects.

Embodied carbon is easiest to influence before major project decisions are locked in. By the time construction documentation is complete, many of the largest carbon drivers may already be difficult or expensive to change. This is why project teams often benefit from understanding how long an Embodied Carbon Report may take before the design pathway becomes fixed.

Structural grids, slab depths, framing systems, basement extent, façade design, material specifications and procurement assumptions can all shape the final carbon profile. These are not minor finishing decisions. They are often central to how the building is designed, documented and constructed.

Early embodied carbon review helps project teams understand which decisions have the greatest influence, so carbon reduction can be considered alongside design quality, compliance, cost, durability and performance. For this reason, it can help to know what information is needed for an Embodied Carbon Report at each stage of the project.

Questions an early embodied carbon review can help answer

The strongest carbon outcomes often come from design intelligence rather than late-stage substitution. A lower-carbon project is usually shaped by the whole system: what is retained, what is built, what materials are selected and how long those decisions are expected to perform. For material-level strategy, see low embodied carbon building materials.

Embodied carbon applies to both residential and commercial buildings. The core question is the same: what is being built, what is it made from and how do those decisions influence the carbon impact of the project?

The difference is usually in the project scale, documentation, reporting expectations and material systems involved. A new home, apartment building, office fitout, mixed-use development or commercial asset may all require a different level of assessment detail.

For this reason, an Embodied Carbon Report should be shaped around the project type, design stage and purpose of the review, rather than treated as a generic calculation. It can also help to understand what information is needed for an Embodied Carbon Report before the assessment begins.

The practical value of embodied carbon reporting is that it can be scaled to the project. Some projects need a clear material carbon review. Others may need a more formal pathway connected to lifecycle assessment, certification or asset reporting. For commercial comparison, see Embodied Carbon Report vs NABERS Embodied Carbon and how embodied carbon fits into Green Star projects.

Embodied carbon reporting and Life Cycle Assessment are closely related, but they are not the same thing. Both can help project teams understand environmental impact, but they usually operate at different levels of scope and detail.

An Embodied Carbon Report usually focuses on greenhouse gas emissions associated with building materials, products and construction systems. It is often used as a practical project tool to understand where carbon is concentrated and where reduction opportunities may exist. The value of the report depends heavily on what is included in the assessment scope.

A Life Cycle Assessment is broader. It can assess multiple environmental impact categories across a defined life cycle, depending on the methodology, scope and purpose of the assessment.

In simple terms, embodied carbon reporting is usually the more accessible carbon-focused starting point. Life Cycle Assessment may be appropriate when the project needs a broader and more formal environmental assessment.

Embodied Carbon Reports and NABERS Embodied Emissions can both relate to the carbon impact of building materials, but they should not be treated as the same thing.

An Embodied Carbon Report is usually a practical project assessment. It helps a team understand where material and construction-related carbon is likely to sit and what decisions may influence the result. The report scope should be clearly understood, including what is included in the Embodied Carbon Report and what sits outside the assessment boundary.

NABERS Embodied Emissions is a specific reporting pathway with defined requirements, inputs, rules and documentation expectations. Projects pursuing this pathway should review the NABERS requirements separately.

In the Certified Energy knowledge ecosystem, this page explains the foundation of embodied carbon in buildings. The NABERS Embodied Emissions page explains the specific pathway for projects that need to follow that framework.

Embodied carbon can also sit within broader sustainability rating frameworks. In these settings, material carbon is usually one part of a wider assessment that may include energy, water, waste, indoor environment quality, resilience, ecology, procurement or governance.

This is different from a standalone Embodied Carbon Report. A report may focus specifically on the carbon impact of materials and construction systems, while a rating framework may use embodied carbon as one part of a much broader project outcome. For comparison, see Embodied Carbon Report vs Life Cycle Assessment.

Understanding this relationship helps project teams choose the right pathway. Some projects need a practical carbon report. Others may need embodied carbon work to support Green Star, ISCA, Life Cycle Assessment or another formal sustainability framework.

The key distinction is scope. Embodied carbon reporting focuses on material and construction-related carbon. Green Star and ISCA place those carbon decisions within a wider sustainability assessment framework.

Reducing embodied carbon is not usually about one isolated material change. The strongest outcomes often come from a combination of design efficiency, material reduction, careful specification, product data, construction planning and long-term durability.

The right strategy depends on the project type, design stage, performance requirements and available documentation. A residential renovation, commercial development, infrastructure project or adaptive reuse project may each have different opportunities.

An Embodied Carbon Report can help identify where reduction strategies are most likely to be useful, rather than applying generic low-carbon assumptions across the whole project. This depends on having enough project information to understand quantities, specifications and material systems, so it can help to review what information is needed for an Embodied Carbon Report.

This is why embodied carbon reduction should be technically grounded. A good strategy considers what can be retained, what can be reduced, what can be substituted and what needs to perform reliably over the life of the building. For material-specific context, see concrete, steel and timber embodied carbon.

Building performance is no longer only about how much energy a building uses once it is occupied. Future-facing performance also considers how the building is made, what materials it uses and how those materials perform over time.

This is where embodied carbon becomes important. A building may be efficient to operate, but still carry significant carbon impact through structure, façade, materials, finishes and construction processes. A more complete performance strategy considers both the physical building and its operational life, including the relationship between embodied carbon and operational carbon.

Embodied carbon reporting helps project teams make this broader performance picture visible. It connects material choices with carbon outcomes, allowing earlier conversations around reuse, durability, procurement, specification and long-term building value.

Future building performance is increasingly shaped by

The future of building performance is not one metric. It is a more complete understanding of how buildings are designed, constructed, operated, maintained and adapted over time. This is also why broader frameworks such as Green Star and practical guidance on low embodied carbon building materials are becoming increasingly relevant to project teams.

The information needed for an Embodied Carbon Report depends on the project stage, assessment scope and level of detail required. Early reviews may use broad material assumptions, while more detailed reports usually require drawings, schedules, quantities and product information.

A Bill of Quantities, or BoQ, can be useful because it provides material quantities that support more accurate embodied carbon assessment. Where a BoQ is not available, the report may need to rely on drawings, schedules, specifications or quantity estimates. The right inputs also depend on what is included in the Embodied Carbon Report.

Environmental Product Declarations, also known as EPDs, can improve the quality of the assessment by providing product-specific emissions data. Where EPDs are not available, recognised emissions factors or industry-average data may be used, depending on the purpose of the report.

Common documents and inputs

If the project is connected to a formal pathway such as NABERS Embodied Emissions, Green Star, ISCA or Life Cycle Assessment, the required information, timing and documentation may need to align with that framework as well as the embodied carbon reporting scope.

Project Review

Clarify the right embodied carbon pathway for your project

Send the available project brief, plans, material information and reporting requirements for an initial review. Certified Energy can help determine the level of embodied carbon assessment that best supports the project.

Early review can clarify whether the project requires an Embodied Carbon Report, a broader Life Cycle Assessment, a NABERS Embodied Emissions pathway or a coordinated carbon strategy before major structural, material and procurement decisions are finalised.