Australian construction emissions, calculated in seconds.

Enter your construction spend. Get an instant emissions estimate built on Australian data and ready for AASB S2 reporting. No specialist knowledge required.

Scope 3 is expanding.
Construction is in scope.

If your business has funded a fitout, a new facility or a capital works program, you may now be responsible for reporting the associated emissions.  

Australia’s mandatory climate disclosure framework is expanding under Australian Sustainability Reporting Standard AASB S2.
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Finance and ESG teams are being asked to account for construction emissions, often for the first time. For many organisations, construction is one of the largest and least visible sources of Scope 3 emissions in their value chain – and one of the hardest to measure.

Hiring a specialist consultant

Comprehensive carbon assessments can provide valuable insight, but generally requires specialist expertise, detailed project information and additional time to complete.

Using an overseas benchmark

Data from supply chains, energy grids and building typologies that look nothing like Australia’s. Unreliable for local compliance.

There's a better option

Australian-specific data. Spend-based inputs. Instant results.

Calculate now

From spend to Scope 3, in seconds.

Petra Carbon index is built around one insight: the data you need to estimate construction emissions is captured in company cost data. You don’t need a full project inventory or specialist knowledge.

01

Enter your spend data

Your construction spend is already in your financial records. Petra Carbon Index turns that data into a Scope 3 figure without requiring you to become a carbon expert.It fits your existing reporting workflow.

02

Petra Carbon Index applies Australian emissions factors

Petra Carbon Index gives you a reliable Australian methodology to anchor your construction emissions reporting. Use it to build your Scope 3 inventory, run scenario analysis or sense-check consultant numbers.

03

Get your Scope 3 estimate

If you support large businesses with Scope 3 reporting obligations, Petra Carbon Index gives you a fast, credible reference number, without the cost or lead time of a full carbon assessment.

Calculate now

Why Australian data matters

Australian construction doesn’t look like construction anywhere else. Our supply chains, labour markets, energy grid and building typologies are distinct. They produce distinct emissions profiles. Generic overseas tools apply international benchmarks that weren’t built for Australian conditions. The result is an estimate that can be off by a significant margin. Not good enough for a compliance document.  

Petra Carbon Index is built on a proprietary database developed from hundreds of Australian construction projects – the most comprehensive local dataset of its kind.

How we calculate

Petra Carbon Index uses a spend-based methodology to calculate embodied carbon: the emissions produced in the manufacture, transport and installation of construction materials and systems.

Rather than requiring a detailed bill of quantities, material inventory or design documentation, Petra Carbon Index uses project expenditure data to estimate embodied carbon across the major elements of construction. Petra Carbon Index:

Covers structure, façade, fitout, building services and external works
Aligns with GHG protocol and supports reporting under AASB S2
Requires spend-based inputs, with no specialist knowledge or complex inventory needed
Provides insights that are robust enough for annual sustainability reporting and detailed enough to identify highest impact spend categories.

Methodology

AASB S2, simplified

Australia’s mandatory climate-related financial disclosure standards require companies to report material Scope 3 emissions. For many organisations, construction is one of the largest and least understood sources of Scope 3 emissions.
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Petra Carbon Index can help you to understand those emissions:

A construction-specific emissions benchmark designed for Australian conditions and aligned with the GHG Protocol methodology
A practical way to estimate embodied carbon where project-level data is unavailable
A more credible alternative to generic spend-based factors and offshore datasets
A starting point to help identify hotspots, prioritise action and strengthen disclosures over time.

Who is Petra Carbon Index for?

Finance managers and reporting teams

Turn construction spend data into a credible Scope 3 estimate without needing specialist carbon expertise. Petra fits easily into existing reporting and disclosure processes.

Sustainability and ESG professionals

Build a stronger understanding of construction-related emissions, run scenario analysis, sense check consultant numbers and support Scope 3 reporting with Australian-specific data.

Management accountants and advisors

Generate a fast, credible reference number for construction emissions without the cost, complexity or lead time of a detailed carbon assessment.