Top Sustainable Consulting Companies Driving ESG Transformation

Sustainable consulting assists companies in implementing tactics to reduce their environmental impact, comply with Environmental, Social, and Governance (ESG) standards, and evolve toward more sustainable practices. Sustainable consulting services comprise sustainability plan expansion, ESG risk assessment, regulatory reporting, and operational execution across industries. Surging adoption of ESG strategy advisory, growing demand for carbon management consulting, increasing emphasis on sustainable supply chain consulting, and rapid integration of sustainability data analytics are fostering market expansion.

Growing corporate commitments to carbon neutrality are creating growth opportunities for sustainability consulting firms. Companies require specialized guidance to build credible decarbonization roadmaps, strengthen climate resilience, and enhance supply-chain sustainability. Rising emphasis on Scope 3 emissions and climate resilience is further expanding consulting services toward execution-focused advisory. 

According to a report by Fortune Business Insights™, the market for sustainable consulting reached USD 11.79 billion in 2025 and is predicted to reach USD 27.21 billion by 2034 with a CAGR of 9.5% from 2026 to 2034.

Fortune Business Insights™ Profiles Top 10 Companies in the Sustainable Consulting Market

1. Accenture plc

Accenture plc is an international IT services and consulting firm situated in Ireland. It supports clients in comprehending the business model-improving capability of digitization. Accenture offers expertise across strategy, consulting, digital, technology, and operations, enabling clients to address complex business challenges effectively. The company’s sustainability services and plans aids businesses implement sustainability as a competitive edge.

• June 2025: Accenture integrated its sustainability consulting capacities with its Accenture Sustainability Innovation Hub. This move precisely assists in enterprise-scale net-zero transformation and ESG execution programs.

2. Deloitte Touche Tohmatsu Limited (U.K.)

Based in the U.K., Deloitte is a professional services network, assists in developing a sustainable path forward. By merging leading technology and capacities, Deloitte’s end-to-end sustainability solutions and services act as a driver for revolution toward a more sustainable future. The firm integrates flexible solutions that align with client’s strategy and goals. Its solutions include technologies such as Geospatial, and Enterprise Resource Planning (ERP), and Artificial Intelligence (AI) which are deployed across systems and functions to assist several sustainability applications.

• May 2024: Deloitte launched a unified Global Sustainability Transformation Framework, integrating regulatory reporting, climate analytics, ESG strategy, and operational implementation services into a single delivery model to assist large enterprises executing multi-year sustainability programs.

3. Ernst & Young Global Limited (U.K.)

Ernst & Young Global Limited (EY) is a U.K.-based multinational professional services network that offers tax, consulting, assurance, and strategy and transactions services. The company delivers sustainability-focused solutions designed to help organizations confidently navigate the transition toward a resilient and inclusive economy where businesses, and  communities can thrive. It helps businesses develop new values and attain sustainability goals. EY assists companies in advancing sustainability strategies, mitigating ESG concerns, enhancing stakeholder trust, and delivering measurable ESG outcomes.

• March 2025: Ernst & Young (EY) introduced improvements in its EY Climate Risk and Resilience platform, allowing customers to perform scenario-based climate risk assessments aligned with developing regulatory disclosure frameworks. The update assists in ESG reporting and climate-related financial risk analysis for large enterprises.

4. PricewaterhouseCoopers International Limited (U.K.)

PricewaterhouseCoopers, also recognized as PwC, is a business advisory service network based in London, U.K. It protects value and unlock evolution by improving business plans with sustainability. The firm helps organizations strengthen business performance by identifying opportunities for new revenue streams, optimizing costs, and mitigating operational risks. With profound sector knowledge, cross-functional skill, and AI-enhanced vision, PricewaterhouseCoopers navigate the difficulties related to climate change and sustainability.

• October 2024: PricewaterhouseCoopers (PwC) increased its CSRD (Corporate Sustainability Reporting Directive) advisory and assurance services across Europe. This tactic assists clients with end-to-end execution of EU sustainability disclosure necessities such as governance design, data readiness, and independent assurance.

5. KPMG International Limited (Netherlands)

Headquartered in the Netherlands, KPMG International Limited emphasizes the growing importance of sustainability in achieving business performance. It offers complete, "strategy-led" sustainability and ESG (Environmental, Social, and Governance) consulting to assist companies’ evolution from, to, and beyond compliance. KPMG offers value-preserving and profitable strategies to assist in navigating changing market dynamics and intricate regulatory environments. The company’s sustainability services are designed to support client needs, promote innovation and expansion, save operating costs, and strengthen competitive advantage.

• August 2024: KPMG introduced an Industrial Decarbonization & Supply Chain Sustainability Center of Excellence. It has concentrated on advising manufacturing and industrial clients on Scope 1–3 emissions reduction, ESG performance enhancement, and regulatory compliance across global value chains.

6. McKinsey & Company (U.S.)

Founded in 1926, McKinsey & Company is an American strategy and management consulting company that provides professional services to businesses and governments. The company emphasizes a digital revolution to accelerate environmental improvements. It primarily concentrates on the finances and operations of its clients. McKinsey brings an exclusive approach to ESG concentrated on value creation that includes benchmarking, strategy expansion, initiative design, and program implementation.

7. Boston Consulting Group (U.S.)

Based in the U.S., Boston Consulting Group (BCG), is one of the popular ESG consulting service firms. It is an associate of numerous prominent environmental groups, including Ellen MacArthur Foundation and the World Wide Fund for Nature. The business deploys different AI and data analytics tools to comprehend ecological impact and has committed to net-zero energy goals. It creates new services and teams focused on bringing extra ESG and compliance insights and resources to its clients.

8. Bain & Company (U.S.)

Bain & Company is an American management consulting corporation situated in Boston, Massachusetts, serving public, private and non-profit administrations. It has made a mark in sustainability consulting and delivering services such as strategy expansion for organizational revolution. Its expertise spans energy transition, carbon emissions management, sustainable investments, and transformational growth strategies that support long-term organizational success.

9. ERM Group (U.K.)

A U.K.-headquartered ERM Group is a major advisory company focused exclusively on sustainability, delivering specialized consulting services across industries and financial sectors. ERM Group is dedicated to assisting organizations in building flexibility and translating sustainability plans into commercial success.

10. AECOM (U.S.)

A U.S.-based AECOM is one of the top 10 sustainable consulting companies and delivers innovative solutions to build a more sustainable future. As a reliable professional service company driven by profound technical skills, it resolves clients’ complexities in water, environment, energy, transportation, and buildings. AECOM remains committed to responsible operations through continuous efforts toward lowering emissions, generating social impact, and fostering an inclusive workplace culture.

Why are Companies Looking for Sustainable Consulting to Build Transparent Business Models?

Government agencies, investors, and stakeholders from all spheres are calling firms to be more transparent about their ESG and sustainability performance so as to evaluate their long-term value. In response, companies are expanding their disclosure practices and leveraging innovative reporting methods that combine financial and non-financial criteria to satisfy stakeholder needs. Businesses are placing a higher priority on their sustainability and ESG obligations. They recognize that it can benefit both the company and the environment to consider long-term stakeholder opinions and the social and environmental effects of their activities. Top 10 sustainable consulting companies can assist clients in improving and communicating their ESG and sustainability performance to stakeholders and in incorporating these factors into business strategy.

These initiatives enable companies to strengthen the strategic importance of supply chain management and sustainability within their operations. By mitigating potential risks and fostering a strong corporate reputation, organizations can maintain their social license to operate while supporting future expansion opportunities. In addition, improved operational frameworks help reduce overall costs and enhance decision-making capabilities, ultimately driving greater efficiency, performance, and long-term business value.