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SLR Consulting

SLR Consulting is a privately owned international sustainability consultancy founded in 1994 as SECOR Ltd in the United Kingdom, specializing in environmental, engineering, and advisory services to support clients across various industries in achieving sustainability goals. With a mission to "Making Sustainability Happen," the firm combines expertise in strategy, design, compliance, operations, and remediation, offering over 45 technical services tailored to sectors including energy, infrastructure, mining, and manufacturing. Headquartered in , SLR Consulting has grown significantly through organic expansion and strategic acquisitions, such as MMI Environmental, RPA Inc., and 360 Environmental, establishing a global footprint with more than 135 offices across six regions including , the , , , , and . As of 2025, the company employs over 4,500 professionals, including scientists, engineers, and business consultants, enabling it to operate in 127 countries and deliver projects focused on , decarbonization, and . In 2022, SLR received a significant from , further bolstering its capacity for in solutions. The firm's growth trajectory is evidenced by its turnover surpassing £103 million by , reflecting its evolution from a UK-based entity to a leading global advisor on complex environmental challenges. SLR Consulting emphasizes practical delivery, partnering with clients to navigate journeys from initial strategy to project execution, while prioritizing ethical practices and long-term .

Overview

Company profile

SLR Consulting is a global consultancy founded in as SECOR Ltd. in , , and renamed SLR Consulting in 2000 following a . The firm specializes in providing environmental, social, and economic solutions to clients across key sectors including , , , and , supporting projects from strategy and design through compliance, operations, and remediation. With expertise in , engineering, economics, and , SLR delivers full-spectrum services to balance environmental impacts with business objectives. As of , SLR employs over 4,500 professionals worldwide, operating from more than 135 offices across more than 40 countries on six continents. This global network enables the firm to serve clients in diverse regions, including , , , , , and the , including a recent expansion into the Middle East through the acquisition of 5 Capitals in 2025, with a focus on practical, region-specific strategies. In 2022, acquired a majority stake in SLR from Charterhouse Capital Partners, transitioning the firm to private equity-backed expansion and accelerating its growth in consulting. By , the company's annual turnover had reached £103 million, driven primarily by advisory and services.

Mission and values

SLR Consulting's purpose is to make happen by delivering science-based, practical solutions that enable sustainable flows of resources, energy, capital, information, and nutrients while balancing , , and economic viability. This commitment is guided by the principle of Rational Sustainability, which emphasizes evidence-based approaches and lasting impact across clients' sustainability journeys, from strategy development to implementation and remediation. The company's approach is guided by , technical excellence, and collaborative relationships. empowers SLR's teams through intelligent systems and forward-thinking methodologies to address complex challenges. ensures a responsible approach to and , while collaboration fosters a "One Team" culture that promotes global cooperation among its over 4,500 employees. Client-centricity drives the provision of tailored, full-spectrum solutions that prioritize client needs and deliver measurable results. SLR integrates (ESG) principles across all services, with a strong emphasis on supporting clients' transitions to . The firm has set validated (SBTi) goals, including a 42% reduction in Scope 1 and 2 by 2030 and 90% by 2040, alongside a 25% reduction in Scope 3 emissions by 2030 and 90% by 2040, aligned with limiting to 1.5°C. SLR emphasizes (DEI) within its workforce, celebrating diverse voices to enhance innovation, resilience, and decision-making. The company invests in employee programs focused on building expertise, enabling staff to contribute effectively to global challenges through ongoing training and capability enhancement.

History

Founding

SLR Consulting was established in 1994 as SECOR Ltd. by a group of environmental consultants in , , , in response to the increasing demand for environmental impact assessments amid rising regulatory requirements for projects. The company's initial operations centered on UK-based projects, particularly in waste management and contaminated land remediation, where it provided specialized consulting services to help clients navigate environmental compliance and site restoration challenges. In 2000, SECOR Ltd. was renamed SLR Consulting to better reflect its broadened expertise in strategic land and regeneration services, coinciding with the commencement of operations in the United States. This period marked significant early growth, with the firm expanding from a small founding team to over 100 staff members by the end of the year, fueled by UK regulatory developments such as the implementation of the Environmental Impact Assessment Directive, which mandated thorough environmental evaluations for major projects.

Expansion and acquisitions

SLR Consulting began its international expansion in 2000 by establishing operations in the United States, opening its first North American office in Washington State and growing its global staff to over 100 employees that year. By 2007, the company had further expanded into Canada, with staff numbers surpassing 250 and annual turnover exceeding £30 million. This period marked the foundation for broader geographic reach, including the launch of operations in Australia in 2010 and South Africa and Namibia in 2011. The company's growth accelerated through strategic acquisitions starting in the mid-2010s, enhancing its expertise in , and advisory services. In 2014, SLR acquired Challenge Energy, a UK-based consultancy specializing in upstream oil and gas solutions, as part of its fifth acquisition in the sector that year. By the end of 2014, staff had grown to over 1,000, with turnover reaching £103 million. Subsequent expansions included the 2019 acquisition of Milone & MacBroom (MMI), a 185-person East Coast firm focused on environmental and consulting, and Roscoe Postle Associates (RPA), a 60-person global advisory business with offices in , , and . In 2021, SLR continued its acquisition strategy with the purchase of Vectos, a consultancy providing and advisory services, alongside 360 Environmental in for enhanced environmental management capabilities. These moves supported entry into new markets like and . In 2022, private equity firm acquired a majority stake from Charterhouse Capital Partners, which had backed 15 prior acquisitions since 2019, enabling further global scaling. By 2025, SLR had completed numerous acquisitions across six countries and sectors including , environmental services, and , bolstering capabilities in , renewables, and advisory. Key recent deals included Robertson GeoConsultants in November 2024, a Canadian geotechnical consultancy; Wardell Armstrong in October 2024, a 550-person UK-based environmental, , and consultancy; Malk Partners in October 2024, a US advisory firm; Powerhaus Consulting in August 2025, a Canadian advisory firm; A. DiCesare Associates in October 2025, a US firm; Forte Dynamics in October 2025, a US and firm; 5 Capitals, announced in July 2025 and completed in September 2025, a Dubai-based consultancy marking entry into the ; and Fuse Advisors in November 2025, a Vancouver-based management consultancy. Staff numbers exceeded 3,000 by 2023 and surpassed 4,500 by 2024, driven by over 1,000 new hires from acquisitions that year alone.

Services

Environmental and sustainability consulting

SLR Consulting provides expertise in environmental impact assessments (EIAs), permitting, and , supporting projects across , , and sectors. The firm conducts comprehensive EIAs, including screening, scoping, and development of plans, to ensure with local, state, federal, and standards such as those from the and (IFC). For projects, SLR has facilitated permitting for initiatives like the Côté Gold Project in , , and the Grassy Mountain Mine in , . In the sector, services include support for the Zambia GET FiT bid and the Goreway Power Station in . Infrastructure examples encompass environmental approvals for the New South Wales Transport Access Program in and the Coomera Connector Stage 1 South in . In sustainability services, SLR offers reporting, analysis, net gain strategies, and advisory to help organizations integrate factors into operations. reporting assistance includes preparing frameworks like EcoVadis for clients such as Duro-Yokota in the , while analysis supports assessments for global firms. net gain strategies, particularly in jurisdictions like the , involve calculating metrics, developing offset plans, and implementing schemes to achieve at least 10% uplift in . Examples include wetland mitigation at Killingworth Reservoir in , , focusing on offset strategies. advisory focuses on , waste minimization, and closed-loop systems, including audits for and closed-loop systems. With over 15 years in advisory, SLR tailors these services to corporate, fund, and portfolio levels. Specialized offerings include contaminated land remediation, water resource management, and modeling. For contaminated land, SLR performs , site investigations, risk assessments, and remediation design across contaminants and media, with projects like soil management at Anchorage International Airport in , , and remediation of decommissioned workshops at a mine site in South Africa's . Water resource management integrates environmental assessments for supply, treatment, and wastewater, addressing regulatory challenges such as effluent toxicity; examples include floodplain restoration at Melrose Terrace in , , and performance improvements at the Shashi Wastewater Treatment Plant in . modeling involves impact analysis and strategies, supporting initiatives like the V20 Group funding program for in vulnerable countries. assessments support global firms like and in . SLR supports net-zero transitions through decarbonization roadmaps and social impact assessments for affected communities. Decarbonization services include reduction audits for Canadian refineries and reporting for oil and gas operations in , , aiding quantifiable emissions reductions. Social impact assessments cover , resettlement action plans, livelihood restoration, due diligence, and gender-based evaluations, as demonstrated in the Environmental and Social Impact Assessment for the 206 MW Ruzizi III Hydroelectric Project in . These efforts emphasize pragmatic to balance development with and environmental .

Engineering and technical services

SLR Consulting provides a range of engineering and technical services that emphasize practical design, modeling, and execution for complex projects in , , and . These services integrate civil, geotechnical, and expertise to deliver sustainable solutions that address site-specific challenges while minimizing environmental impacts. Recent partnerships, such as with Waterise in 2025, expand capabilities in sustainable for . In civil and , SLR focuses on feasibility studies, site planning, hydrologic assessments, and construction documentation for developments such as roadways, bridges, , and shoreline stabilization. The firm's geotechnical services include investigations, foundation design, , and ground improvement techniques, often applied to operations—like tailings storage facilities in —and sites, such as proposed facilities in . complements these efforts through remediation designs for soil and , systems, and integration with broader goals. Technical services encompass advanced modeling and tools to support project planning and . Hydrological modeling is a core offering, involving risk evaluations, stormwater management plans, and dam safety analyses for projects, including tailings dam routing at the Tarkwa Gold Mine in . Air quality simulations utilize dispersion modeling for permitting and impact assessments across sectors like oil and gas, , and , incorporating tools for source apportionment and emissions control feasibility. GIS-based enables data , site selection, and thematic , such as analysis for decisions and culvert prioritization. Project management and execution support span the full lifecycle, from initial feasibility studies—e.g., evaluating retrofit options for automated systems—to operational optimization and closure planning. SLR employs multidisciplinary teams to ensure efficient scope, schedule, and budget control, with a strong emphasis on practices like low-impact development and . Digital tools enhance these capabilities; for instance, (BIM) has been integrated into collaborative design processes, as demonstrated in SLR's contribution to the 2015 Build New York Live BIM challenge for Hudson Yards redevelopment. Additionally, AI-driven supports risk mitigation through forecasting models for energy needs, transport optimization, and environmental impacts, aligning technical outputs with frameworks.

Global presence

Regional operations

SLR Consulting's operations in are centered in the , its headquarters location since founding in 1994, where the firm delivers core services in environmental permitting and development to support goals across and sectors. In , established in 2014, and , entered in 2022, the company adapts to regulatory frameworks by providing specialized compliance consulting for environmental impact assessments and renewable projects, ensuring alignment with directives on emissions and . In , SLR Consulting maintains a strong focus on the and sectors across the , where operations began in 2000, and , established in 2007, leveraging acquisitions to enhance expertise in (ESG) frameworks for transitioning oil and gas operations toward sustainable practices. The firm supports clients in , mine closure planning, and strategies, addressing challenges like carbon reduction in fossil fuel-dependent regions. Australasia represents a key region for SLR Consulting, with operations in since 2010 and since 2014, emphasizing and site through deep of local regulatory expertise. The company advises on environmental strategies for collieries and other extractive sites, while contributing to sustainable projects that balance with . In , SLR Consulting specializes in and water management, operating in and since 2011, and since 2020, to address resource extraction challenges in water-scarce environments. The firm conducts hydrogeological investigations and assessments for operations, such as partnerships for river basin studies in , promoting responsible water use and amid regional booms. Following acquisitions in 2025, including RPMGlobal's mining advisory division, SLR Consulting has developed an emerging presence in , the , and , targeting in urban development and transitions. In the , the July 2025 acquisition of 5 Capitals in bolsters ESG and consulting for regional diversification. In , expansions since 2021, including the 2024 acquisition of SGA in , focus on decarbonization strategies for and sectors, integrating environmental services for industrial clients.

Office network

SLR Consulting maintains a of more than 135 offices as of 2025, distributed across regions including , , (encompassing ), , the , and . These offices support regional project delivery through dedicated teams focused on environmental assessments, solutions, and advisory services. The network includes specialized facilities such as research labs for environmental modeling and client collaboration centers that facilitate on-site consultations and data analysis. Key operational hubs anchor the network in strategic locations. The global headquarters in , , serves as the central coordination point for operations and overall . In , the office functions as a primary center for mining-related consulting, while the Vancouver, Canada location supports broader environmental and projects. Asia-Pacific's Perth office in specializes in and resource sector initiatives, Johannesburg in leads sustainability efforts across Africa, Dubai in the handles engagements following recent expansion, and Santiago in coordinates Latin American activities. The office network has expanded significantly through targeted acquisitions. In 2024, the acquisition of Wardell Armstrong added approximately 11 new offices primarily in the , enhancing capabilities in , and mining consultancy. Further growth occurred in 2025 with the acquisition of 5 Capitals, establishing a presence in and strengthening operations in consulting. These additions integrate specialized teams and infrastructure, ensuring seamless support for global client projects without overlapping regional strategies.

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