What is a Fractional Chief Sustainability Officer, and when does an organisation need one? by Dr. Ina Eileen Peukes

How senior sustainability leadership can help manufacturers, property developers, construction businesses and other growing organisations turn climate reporting, tender and supply-chain requirements into practical business decisions.

Prepared by: Dr Ina Eileen Peukes, auverde, Environmental and sustainability consultancy

A Fractional Chief Sustainability Officer gives an organisation senior sustainability leadership without requiring a full-time executive hire. The role is most valuable when sustainability has become commercially important, but ownership, capability or senior decision-making is still missing.

Sustainability used to be something many organisations could manage through occasional projects: an energy audit, a carbon footprint, a tender response or an annual ESG update. That model is becoming harder to sustain. Climate-related financial reporting, customer requests for emissions data, procurement requirements, supply-chain scrutiny and internal decarbonisation targets increasingly overlap. What looks like a set of separate technical tasks quickly becomes a leadership issue.

This is where a Fractional Chief Sustainability Officer, often shortened to Fractional CSO, can be useful. A Fractional CSO brings senior sustainability capability into the business on a part-time or embedded basis. They help management decide what matters, create the governance and systems needed to act on it, and make sure sustainability work is connected to commercial priorities rather than sitting at the edge of the organisation.

For manufacturers, property developers, construction businesses and suppliers to the built environment, the need can arise earlier than expected. These organisations often manage complex supply chains, materials, energy use, project requirements, product data, tenders and client expectations. They may not need a full-time sustainability executive, but they can still need someone senior enough to connect those moving parts and be accountable for the result.

What is a Fractional Chief Sustainability Officer?

A Fractional Chief Sustainability Officer is a senior sustainability leader who works with an organisation for a defined portion of time rather than as a full-time executive. The person may work one or several days a week, intensively during a transformation or reporting period, or on an ongoing retainer that changes as the organisation builds internal capability.

The important word is not “fractional”. It is “Chief”. The role is not designed simply to complete sustainability tasks. It is designed to provide senior ownership: setting priorities, advising executives and boards, coordinating functions, challenging weak assumptions, translating technical requirements into decisions, and making sure that sustainability commitments can be supported by evidence.

A good Fractional CSO therefore sits between strategy and delivery. They may oversee carbon accounting, climate risk, reporting, tender responses, supply-chain engagement or sustainability strategy, but their real job is to make those activities work as one coherent management system.

Why Businesses are Creating this Role Now

The sustainability workload is changing in two important ways. First, the expectations are becoming more technical and more formal. Second, responsibility is spreading across the business.

In Australia, mandatory climate-related financial reporting under the Corporations Act and AASB S2 is being phased in across three groups. Group 1 reporting began for financial years starting on or after 1 January 2025. Group 2 begins for financial years starting on or after 1 July 2026, and Group 3 begins on or after 1 July 2027. AASB S2 requires disclosures across governance, strategy, risk management, and metrics and targets, including greenhouse gas emissions and climate-related risks and opportunities.

Even businesses that are not directly captured by the reporting thresholds can feel the effect. ASIC specifically notes that reporting entities may request information from organisations in their value chain, including small businesses. In practice, that can mean customers asking suppliers for emissions data, climate information, product data, policies or evidence that supports their own disclosures.

Procurement is moving in the same direction. Australian Government procurement guidance requires environmental sustainability to be considered as part of value for money, including factors such as energy efficiency, climate change impacts, environmental impacts, circularity and recycled content. For businesses that rely on tenders, sustainability is therefore not only a reporting issue. It can influence access to work.

The result is a familiar problem: sustainability becomes important to finance, sales, procurement, operations, risk and the executive team at the same time, but no one person has the authority or specialist knowledge to coordinate it. A Fractional CSO fills that gap.

When Does an Organisation Need a Fractional CSO?

There is no single trigger. The clearest signal is that sustainability decisions are becoming material to the business, while responsibility is still fragmented or too junior. The following situations are common.

You have no sustainability person, but the business is being asked to deliver sustainability outcomes

This is often the starting point. The organisation may be receiving customer questionnaires, tender requirements, emissions-data requests or reporting obligations, but the work is being absorbed by finance, quality, marketing, operations or the managing director. Each person can complete part of the task, but nobody owns the full picture. A Fractional CSO creates a single point of accountability, builds a practical work programme and prevents important requirements from becoming last-minute exercises.

You have sustainability staff, but not senior sustainability leadership

A sustainability coordinator, ESG analyst, environment manager or project sustainability professional may be very capable at delivery. The gap appears when the work requires executive judgement: deciding priorities, setting targets, making investment trade-offs, challenging data quality, engaging the board, negotiating responsibilities across departments, or deciding what the organisation should and should not claim publicly. A Fractional CSO can provide senior cover and mentoring while allowing the internal team to keep ownership of day-to-day delivery.

Climate reporting is moving from “future issue” to a management requirement

Climate-related financial disclosure is not simply a carbon-accounting exercise. AASB S2 links climate to governance, strategy, risks and opportunities, financial effects, scenario analysis, emissions, metrics and targets. Preparing credible information requires input from finance, risk, operations, procurement and leadership. A Fractional CSO can coordinate that work, identify capability and data gaps, create a reporting roadmap and help management prepare before deadlines create pressure.

Tenders and prequalification questionnaires are becoming harder to answer

Many businesses first feel commercial sustainability pressure through sales. A tender may ask for a carbon-reduction plan, emissions data, environmental policies, circular-economy initiatives, sustainable procurement evidence, climate-risk management or project-specific commitments. Weak answers can make a capable business look unprepared. A Fractional CSO can build the evidence base and standard responses behind the scenes, so tender teams are not reinventing sustainability claims for every bid.

Customers are asking for Scope 3 or supply-chain information

Manufacturers and construction supply chains are particularly exposed to this. Large customers may need supplier data to understand their own Scope 3 emissions and climate risks. The supplier then needs a defensible methodology, boundaries, source data and a process for updating information. A Fractional CSO can help establish the system rather than treating each request as a one-off spreadsheet exercise.

Sustainability activity exists, but it is fragmented

One team is working on energy. Another is preparing ESG material. Procurement has supplier requirements. Marketing is making environmental claims. Operations has waste targets. Nobody can confidently say whether these initiatives add up to a strategy. A Fractional CSO brings them together, removes duplication and links activities to a small number of priorities, owners, metrics and decisions.

The organisation is making major capital, product or development decisions

Sustainability decisions are cheaper and more effective when they are made early. For a property developer, this may mean embedding climate resilience, operational energy, embodied carbon, certification or circularity into design and procurement. For a manufacturer, it may mean evaluating energy upgrades, product redesign, low-carbon materials, process changes or supplier requirements. A senior sustainability voice at the decision table can prevent sustainability from becoming an expensive retrofit at the end.

The business is growing faster than its sustainability capability

Expansion into new markets, larger clients, government work, listed-company supply chains or institutional customers can rapidly increase the level of sustainability information expected. A Fractional CSO can create the governance and systems needed for the next stage of growth, then help recruit or develop the permanent internal team when the workload warrants it.

Management is worried about credibility and greenwashing risk

Sustainability claims increasingly need evidence. The risk is not only saying something false; it is also using broad language that the organisation cannot substantiate, applying inconsistent boundaries, or announcing targets without a credible plan. Senior sustainability oversight helps connect public claims to actual data, responsibilities and delivery plans.

What Does a Fractional CSO Actually Do?

The scope should be designed around the organisation’s commercial priorities, not around a generic sustainability checklist. In practice, a Fractional CSO may lead or oversee work such as:

§  Assessing the organisation’s sustainability obligations, customer requirements and material business risks.

§  Creating a practical sustainability strategy with priorities, responsibilities, measures and timeframes.

§  Establishing governance: who owns climate and sustainability decisions, what reaches the executive team or board, and how progress is reviewed.

§  Building or improving greenhouse gas inventories across Scope 1, Scope 2 and relevant Scope 3 categories.

§  Preparing for AASB S2 climate-related financial reporting, including governance, climate risks and opportunities, scenario analysis, metrics, targets and data readiness.

§  Improving sustainability evidence used in tenders, bids, prequalification and customer questionnaires.

§  Embedding sustainability criteria into procurement and supplier engagement.

§  Advising on decarbonisation priorities, energy efficiency, resource efficiency, circularity and environmental performance.

§  Helping property and construction teams embed sustainability earlier in project briefs, design, procurement and delivery.

§  Reviewing external sustainability claims so they are specific, supportable and consistent with what the business can actually deliver.

§  Building internal capability, training staff and mentoring sustainability team members.

§  Helping management decide when the organisation is ready to recruit a permanent sustainability leader or broader team.

The Business Benefit is Not “More Sustainability Activity”

The point of a Fractional CSO is not to create another layer of work. The point is to make sustainability more useful to the business. Done well, the role creates benefits in several areas.

• Clear accountability: Senior management knows who owns the sustainability agenda, which issues require decisions, and how progress will be tracked.

• Better use of internal time: Finance, operations, sales and procurement teams stop spending disproportionate time interpreting sustainability requirements from scratch.

• Stronger tenders and customer responses: The business develops a consistent evidence base, credible metrics and reusable material rather than producing rushed answers for each opportunity.

• Earlier risk identification: Climate, supply-chain, data and environmental risks are identified while there is still time to manage them rather than during assurance, reporting or bid deadlines.

• More disciplined investment decisions: Sustainability priorities can be assessed alongside cost, operational performance, risk and commercial value.

• Improved credibility: Targets, claims and reports are connected to evidence, ownership and delivery plans.

• Capability transfer: A fractional model can deliberately build the skills of existing staff so the organisation becomes less dependent on external support over time.

• Executive capability without a premature full-time hire: The organisation gets senior judgement when it needs it while retaining flexibility around time commitment and scope.

Fractional CSO vs sustainability consultant vs full-time CSO

These models overlap, but they solve different problems. The distinction is useful because a business may need all three at different stages.

A key difference is accountability. A project consultant can provide excellent advice without becoming part of the organisation’s management rhythm. A Fractional CSO is expected to stay close enough to the business to follow decisions through, coordinate people, identify where delivery is slipping, and return to leadership with a recommendation.

What Should the First 90 Days Achieve?

A Fractional CSO should create clarity quickly. The exact work will differ by organisation, but a useful first phase often includes:

1. A short diagnostic of obligations, customer requirements, existing initiatives, data, governance and capability.

2. A prioritised risk-and-opportunity view that separates urgent requirements from useful but lower-priority work.

3. A 12–24 month sustainability roadmap tied to business priorities and upcoming reporting, tender or customer deadlines.

4. Named owners for the major workstreams, including clear responsibilities across finance, operations, procurement, sales and leadership.

5. A realistic data plan for carbon, energy, materials, waste, suppliers and other material metrics.

6. A reporting and evidence calendar so information is collected before it is needed.

7. A small set of management measures that show whether the programme is moving, rather than a long list of metrics nobody uses.

8. A recommendation on internal capability: what should stay with the Fractional CSO, what can be owned by existing staff, and what future role may need to be recruited.

When a Fractional CSO is Not the Right Answer

A fractional model is not automatically the best option. If the organisation only needs one clearly defined technical output, a specialist consultant may be more efficient. If the sustainability workload is already substantial every day, affects multiple business units continuously, and requires permanent internal leadership, a full-time Head of Sustainability or CSO may be the better investment.

The fractional model is strongest in the middle: the sustainability agenda is too important and interconnected to be handled through isolated projects, but the organisation does not yet need, cannot yet justify, or is not yet ready to recruit a full-time senior executive.

Why this Matters Particularly in Manufacturing and the Built Environment

Manufacturing, property development and construction sit at the intersection of many sustainability pressures. Decisions about materials, energy, equipment, suppliers, design, logistics, waste, asset performance and procurement all influence environmental outcomes and carbon emissions. Those same decisions also affect cost, product quality, programme, risk and marketability.

That makes sustainability leadership fundamentally cross-functional. A developer cannot solve embodied carbon through the sustainability team alone if design and procurement decisions are already locked in. A manufacturer cannot improve Scope 3 data without procurement and supplier engagement. A construction business cannot produce strong sustainability tender responses if the evidence is scattered across project teams. The senior role matters because someone needs to connect technical sustainability knowledge with the decisions that actually shape the outcome.

For businesses in these sectors, a Fractional CSO can also act as a bridge between project-level requirements and company-level systems. Instead of solving the same problem differently on every project, the organisation can create repeatable methods, standard evidence, supplier expectations and governance that improve over time.

What to Look for in a Fractional CSO

The role requires more than sustainability knowledge. Look for someone who can work across technical detail and executive decision-making. Useful capabilities include:

§  Practical carbon accounting and climate-reporting knowledge, not only high-level ESG language.

§  Experience translating environmental requirements into operational and commercial decisions.

§  Enough sector knowledge to understand materials, buildings, manufacturing processes, procurement and supply-chain realities.

§  The confidence to work with executives, finance teams, project teams and technical specialists.

§  A strong understanding of data quality and the difference between an estimate, an assumption and auditable evidence.

§  The ability to prioritise. A good Fractional CSO should be willing to say what does not need to be done yet.

§  A capability-building mindset. The goal should be to strengthen the organisation, not create permanent dependence on an external adviser.

How Auverde Supports Organisations with Fractional Sustainability Leadership

Auverde works with organisations that need senior sustainability expertise but want a practical, proportionate model. This is particularly relevant for manufacturers, suppliers to the built environment, property developers and construction businesses where sustainability needs to connect with real operational, project and procurement decisions.

Support can range from an initial sustainability and climate-readiness assessment through to ongoing Fractional CSO leadership. Depending on the organisation, this may include sustainability strategy, carbon accounting, climate-reporting readiness, ESG and environmental performance, supply-chain engagement, tender support, built-environment sustainability and the development of internal systems and capability.

The aim is not to add sustainability work for its own sake. It is to give the business a clear view of what matters, what is required, what creates commercial value and what needs to happen next.

A Simple Test: Do You Need a Fractional CSO?

If three or more of the statements below are true, the business may have moved beyond ad hoc sustainability support and may benefit from a senior fractional role:

• Customers or tender teams regularly ask us for sustainability information that is difficult to produce.

• We do not have one senior person who is clearly accountable for sustainability.

• Our sustainability work is split across finance, operations, procurement, marketing, quality or project teams.

• We have sustainability staff, but they need senior technical or strategic support.

• We expect climate reporting, Scope 3 requests or customer disclosure requirements to increase.

• We have targets or public claims, but the delivery plan and evidence are not yet as strong as they should be.

• We are making major investment, product, property or procurement decisions where sustainability should be considered earlier.

• Our tender success or customer relationships increasingly depend on credible environmental performance.

• We need a sustainability strategy that management can actually use, not another stand-alone document.

A Fractional Chief Sustainability Officer is most useful when sustainability has become important enough to require leadership, but the organisation does not yet need a full-time sustainability executive. The role gives the business senior capability, accountability and direction while allowing the level of support to match the actual workload.

For manufacturing and built-environment businesses, that can mean stronger tender responses, better climate and carbon readiness, more coherent sustainability strategy, earlier risk management and better-informed project and investment decisions. Just as importantly, it creates the internal systems and capability that allow sustainability to become part of how the business operates rather than a recurring scramble before the next request, report or bid.

If your organisation is reaching that point, auverde can help you assess the gap and design the right level of Fractional CSO support, from an initial diagnostic and roadmap to ongoing senior sustainability leadership.

Frequently Asked Questions

What is a Fractional Chief Sustainability Officer?

A Fractional Chief Sustainability Officer is a part-time or embedded senior sustainability leader who provides executive-level direction, governance, and accountability without being employed as a full-time CSO. The role can oversee climate reporting, carbon management, sustainability strategy, tenders, supply-chain requirements, and internal capability.

When should a company hire a Fractional CSO?

A company should consider a Fractional CSO when sustainability has become commercially or operationally important, but no senior person owns it. Common triggers include climate-reporting preparation, repeated tender requirements, customer requests for emissions data, fragmented sustainability activity, a junior internal team that needs senior support, or major investments that require sustainability input.

Is a Fractional CSO the same as a sustainability consultant?

Not quite. A sustainability consultant is often engaged to complete a defined project or provide specialist advice. A Fractional CSO is more embedded in the organisation and is expected to provide ongoing leadership, coordinate functions, advise management and follow decisions through to implementation.

Can a Fractional CSO help with AASB S2 climate reporting?

Yes. A Fractional CSO can help an organisation assess whether and when reporting requirements apply, build governance and data processes, coordinate climate risk and scenario analysis, oversee greenhouse gas information and create a reporting-readiness plan. Formal legal, accounting and assurance advice may still be required for specific reporting judgements.

Can smaller businesses benefit even if mandatory climate reporting does not apply to them?

Yes. Smaller businesses may still receive sustainability and emissions-data requests from larger customers, lenders, investors or tendering authorities. Building a proportionate system early can reduce repeated manual work and improve commercial readiness.

The structure should follow the organisation’s needs. It may involve a regular weekly or monthly commitment, a more intensive period around strategy or reporting, or a staged engagement that reduces as internal capability grows. The important point is that the role has enough continuity and access to management to provide real ownership.

*This article contains sponsored content.