Sustainable procurement consulting: How to turn strategy into action 

A sustainable procurement strategy can look convincing on paper. But if it doesn’t change what buyers specify, how suppliers are evaluated or what happens after contracts are awarded, how much has really changed? 

Many organisations have established sustainability commitments covering carbon reduction, social value, human rights and responsible sourcing. Turning those commitments into everyday procurement decisions is where the harder work begins. 

Research from IntegrityNext’s State of Sustainable Procurement 2025 report found that 82% of organisations considered sustainability a strategic procurement priority. Yet half of those surveyed reported difficulties measuring the impact of their initiatives. 

Procurement teams need practical processes, clear responsibilities and the confidence to make decisions that deliver against sustainability objectives. 

Sustainable procurement consulting helps organisations bridge the gap between ambition and delivery, bringing specialist knowledge, independent assessment and practical implementation support. 

What is sustainable procurement consulting? 

Sustainable procurement consulting helps organisations integrate environmental, social and economic considerations into the way they purchase goods, works and services. 

This can involve assessing existing procurement practices, identifying supply chain risks, developing strategies, improving sourcing processes, engaging suppliers and building internal capability. 

The aim is to make sustainability part of procurement decisions, rather than a separate exercise managed by the sustainability team. 

The international standard ISO 20400 provides a useful framework. It offers guidance on integrating sustainability into procurement and can help organisations assess their current approach and identify opportunities for improvement. 

However, applying the same framework to every organisation won’t produce the same results. A construction business, local authority and professional services organisation face different sustainability risks, supplier relationships and operational challenges. 

Effective consultancy starts by understanding those differences and identifying where procurement can make the greatest impact. 

For a broader introduction to the principles, see our guide to sustainable procurement. 

Why do organisations struggle to turn sustainable procurement strategies into action? 

The challenge is often less about knowing what the organisation wants to achieve and more about understanding how procurement can deliver it. 

A corporate net zero commitment, for example, provides direction. But procurement teams still need to know which categories to prioritise, what to ask suppliers, how to evaluate responses and how to monitor improvements. 

Research highlights the scale of this challenge. The World Economic Forum’s 2025 Green Procurement Playbook reports that Scope 3 emissions account for more than 90% of corporate greenhouse gas emissions in several sectors, including transport, construction and food and beverage. 

That gives procurement considerable influence over decarbonisation. But influence means little without changes to purchasing decisions and supplier relationships. 

Several common barriers can prevent progress. 

• Unclear priorities. Organisations may attempt to address every sustainability issue across every procurement category, spreading resources too thinly. 
• Limited internal capability. Procurement professionals are expected to understand increasingly complex sustainability requirements alongside commercial and operational responsibilities. 
• Disconnected teams. Procurement, sustainability, finance and operational teams may work towards different objectives without clear ownership. 
• Supplier engagement challenges. Suppliers have different levels of maturity, resources and access to sustainability data. 
• Difficulty demonstrating results. Organisations may track completed questionnaires or training sessions without knowing whether environmental or social outcomes have improved. 

These challenges need more than another policy document. They require changes to how procurement operates. 

How sustainable procurement consultants turn ambition into action 

The most valuable consultancy support helps organisations understand where they are, decide what matters and build the processes and skills needed to improve. 

1. Assess current procurement maturity 

Before making changes, organisations need an accurate picture of how sustainability is currently managed. 

A sustainable procurement maturity assessment can examine governance, policies, category management, sourcing processes, supplier engagement, contract management and performance measurement. 

ISO 20400 provides an internationally recognised reference point for this work. The standard was reviewed and confirmed as current in 2023. 

At Action Sustainability, we use ISO 20400 to help organisations understand their strengths, identify gaps and establish practical priorities. 

The important question isn’t whether a sustainability requirement appears in a procedure. It’s whether people understand it, apply it and use it to influence decisions. 

2. Identify material risks and opportunities 

Not every purchase carries the same sustainability impacts. 

A construction contract may present significant opportunities to reduce embodied carbon and construction waste. An IT contract could raise questions about product lifecycles, resource use and labour conditions. 

Applying identical sustainability requirements to both is unlikely to deliver the best results. 

A materiality assessment helps organisations understand where their most significant risks and opportunities sit across procurement categories and subcategories. 

This allows teams to prioritise resources, develop relevant supplier requirements and focus on issues they can influence. 

Spend is useful information, but it shouldn’t be the only consideration. A relatively low-value contract can still carry substantial human rights or environmental risks. 

3. Embed sustainability into procurement processes 

This is where consultancy needs to deliver practical change. 

Sustainability should influence procurement from the earliest stages of identifying a requirement through to managing the resulting contract. 

That means helping teams: 

• Challenge whether a purchase is necessary and consider alternatives. 
• Incorporate material sustainability priorities into category strategies. 
• Develop specifications that reflect environmental and social objectives. 
• Develop tender questions that are specific to categories 
• Use proportionate supplier selection and tender evaluation criteria. 
• Translate supplier commitments into contractual requirements and KPIs. 
• Monitor delivery and identify opportunities for improvement. 

Timing is important. Once a specification has been finalised, opportunities to rethink the requirement or introduce alternative solutions may already have been lost. 

Consultants can help organisations adapt existing procurement processes, templates and governance arrangements so sustainability becomes part of routine decision-making. 

4. Engage suppliers and build internal capability 

Suppliers are essential to delivering many sustainability objectives. But asking them to meet ambitious requirements without understanding their capabilities can create unnecessary barriers. 

The World Economic Forum’s Green Procurement Playbook identifies limited supplier resources, expertise and access to reliable emissions data as persistent challenges. 

Effective supplier engagement starts with clear expectations and an understanding of what the market can deliver. 

Consultants can support supplier assessments, engagement programmes, workshops and improvement plans. They can also help organisations develop requirements proportionate to supplier size, contract value and sustainability risk. 

Internal capability matters just as much. 

Procurement teams need practical guidance, training and access to specialist support. They should understand when sustainability issues are material, how to evaluate evidence and where to seek further advice. 

The goal is to build confidence and capability within the organisation, reducing reliance on external support over time. 

5. Measure performance and drive improvement 

A sustainable procurement programme needs to demonstrate what has changed. 

This means distinguishing between implementation activity and actual outcomes. 

Training procurement staff, assessing suppliers and adding sustainability criteria to tenders can demonstrate progress. But these measures don’t necessarily show whether the organisation has reduced its environmental impact or improved social outcomes. 

Meaningful measurement might include reductions in supply chain emissions, improved resource efficiency, employment opportunities created, changes in supplier working practices or reductions in identified risks. 

Consultants can help establish baselines, select relevant KPIs and develop reporting processes. 

The starting point should always be the outcome the organisation wants to achieve. Collecting more supplier data is only useful when that information supports better decisions. 

What does sustainable procurement consulting look like in practice? 

The value of consultancy becomes clearer when looking at the challenges organisations are trying to solve. 

National Trust: Identifying where procurement can make the biggest differenceNational Trust: Identifying where procurement can make the biggest difference 

The National Trust commissioned Action Sustainability to undertake a materiality assessment to strengthen its approach to sustainable procurement. 

Our work included reviewing procurement documentation, interviewing more than a dozen Director-level stakeholders and facilitating workshops covering Gardens & Outdoors, IT, Retail/Commercial/Marketing, and Construction & Facilities Management. 

We assessed sustainability risks and opportunities across issues including carbon, circular economy, biodiversity, supplier diversity and labour standards. 

The resulting materiality heatmaps identified priorities at category and subcategory level, providing procurement teams with a practical resource and a roadmap for improvement. 

Read the National Trust case study. 

Siemens Mobility UK: Turning assessment into an action plan 

Siemens Mobility UK wanted to strengthen sustainable procurement consistently across its operations while supporting wider decarbonisation and social value objectives. 

Action Sustainability assessed its procurement maturity against ISO 20400, considering client expectations, regulatory requirements and how existing processes worked in practice. 

We then developed a tailored action plan identifying improvements to procurement processes and category management. 

The work provided a structured approach to strengthening sustainability integration, with priorities aligned to Siemens Mobility UK’s operational requirements. 

Read the Siemens Mobility UK case study. 

Both projects demonstrate an important principle: effective consultancy should give organisations the knowledge, tools and direction to make better procurement decisions. 

When should you bring in a sustainable procurement consultant? 

There isn’t one point at which every organisation needs external support. 

Some seek consultancy when developing their first sustainable procurement approach. Others have established strategies but need help improving implementation or responding to new client requirements. 

External expertise can be particularly valuable when: 

• Sustainability commitments aren’t translating into procurement decisions. 
• Procurement teams lack specialist knowledge or capacity. 
• Supplier requirements are inconsistent across categories. 
• The organisation needs an independent assessment against ISO 20400. 
• Supply chain risks are poorly understood. 
• Progress is difficult to measure or demonstrate. 

Consultancy should complement internal expertise, not replace it. The best results come when consultants work closely with procurement teams and the people responsible for implementation. 

How can you measure the impact of sustainable procurement consulting? 

The real test of consultancy is what the organisation can do differently afterwards. 

A useful starting point is to establish the current position and agree what improvement should look like. 

That might mean stronger category strategies, clearer supplier expectations, improved procurement capability or more consistent contract management. 

Over time, organisations should also be able to assess whether these changes contribute to measurable environmental, social and commercial outcomes. 

IntegrityNext’s 2025 research found that 85% of surveyed procurement professionals reported tangible benefits from sustainable procurement, including improved transparency, stronger supplier relationships and reduced risks. 

Those benefits are worth pursuing. But organisations need appropriate evidence to demonstrate their own results. 

A completed action plan is a useful output. The changes it delivers are what matter. 

How Action Sustainability can help 

At Action Sustainability, we help organisations make sustainable procurement part of business as usual. 

Our consultants bring practical experience in ISO 20400 assessments, materiality analysis, procurement strategy, supplier engagement, training and implementation support. 

We work with organisations to understand their challenges, identify priorities and develop approaches that fit their operations and supply chains. 

Whether you’re starting your sustainable procurement journey or looking to strengthen an existing approach, we can help you move from commitments to practical, measurable action. 

Get in touch with Action Sustainability to discuss how our sustainable procurement consulting services can support your organisation.