Leadership in Energy and Environmental Design (LEED) is a globally recognized certification system developed by the U.S. Green Building Council (USGBC) to measure and verify the sustainability performance of buildings. The certification framework evaluates projects across several environmental categories, including energy efficiency, water conservation, sustainable materials, indoor environmental quality, and site sustainability. Across Europe, the demand for sustainable building strategies has increased as organizations seek to reduce environmental impacts and improve operational efficiency. In Croatia, developers and investors are gradually adopting green building frameworks such as LEED to demonstrate measurable sustainability performance and align projects with international environmental standards. Achieving LEED certification requires a structured process that involves sustainability strategy planning, energy and environmental analysis, and comprehensive documentation management. Project teams often rely on specialized sustainability consultancies to guide them through the certification pathway, coordinate environmental performance evaluations, and manage the submission process with certification authorities. The following consultancies provide services related to LEED certification and green building consulting relevant to projects in Croatia. 1. ERKE Consultancy ERKE Consultancy is an international sustainability consultancy specializing in green building certification and environmental performance consulting. Founded in 2007, ERKE operates offices in Istanbul, Dubai, and London and has delivered sustainability consultancy services across more than 15 countries. The ERKE team includes LEED Fellows and LEED Accredited Professionals (LEED APs) who support project teams throughout the certification process. The company provides services including sustainability strategy development, environmental performance analysis, energy modeling coordination, and management of LEED certification documentation. ERKE has completed more than 200 LEED-certified projects across a wide range of building sectors, including healthcare, airports, commercial developments, and mixed-use complexes. Among these projects are Bahrain International Airport, which achieved LEED Gold certification for its 200,000 square meter terminal building, and Istanbul Çam Sakura Hospital, a healthcare complex covering approximately one million square meters that also achieved LEED Gold certification. This experience with complex and large-scale projects enables ERKE to support developers and project teams aiming to integrate sustainability strategies into building design and construction processes. 2. ARUP Arup is a global professional services firm founded in 1946 that provides engineering, design, planning, and sustainability consulting services. The company operates in more than 30 countries and is known for its multidisciplinary approach to sustainable development. Arup’s sustainability teams assist projects pursuing LEED certification by conducting energy modeling, environmental performance analysis, and sustainability strategy planning. These analyses help project teams identify opportunities to improve building efficiency and environmental performance. The firm frequently works on complex developments where sustainability considerations are integrated with architectural and engineering design solutions. 3. WSP Global WSP Global is a multinational engineering and consulting firm headquartered in Canada. With operations in more than 50 countries, the company provides engineering, environmental consulting, and sustainability advisory services. WSP’s sustainability specialists support projects pursuing green building certifications such as LEED by providing building performance analysis, energy modeling, sustainability planning, and documentation support for certification submissions. The company frequently collaborates with developers, architects, and engineering teams to integrate sustainability objectives into building design and development. 4. Ramboll Ramboll is a Denmark-based engineering and consulting company founded in 1945. The firm provides services across infrastructure, buildings, and environmental consulting sectors and operates internationally. Ramboll’s sustainability consultants assist project teams pursuing LEED certification by providing services such as environmental analysis, building performance modeling, and sustainability strategy development. These services help projects meet certification criteria related to energy efficiency and environmental performance. The firm often works with multidisciplinary teams to incorporate sustainability objectives into building design and planning. 5. Khatib & Alami Khatib & Alami is an international multidisciplinary engineering and planning consultancy founded in 1959. The company operates across the Middle East, Europe, and Africa and provides services in architecture, engineering, and environmental consulting. Within sustainability consulting, Khatib & Alami assists projects pursuing green building certifications such as LEED. The firm provides services including sustainability strategy development, environmental performance assessments, and building system evaluations. Khatib & Alami frequently works on large infrastructure and development projects where sustainability performance and environmental targets are important planning considerations. 6. Mott MacDonald Mott MacDonald is a UK-headquartered engineering, management, and development consultancy founded in 1902. The company operates globally and provides services across infrastructure, water, energy, and environmental sectors. The firm offers sustainability consulting services that support projects pursuing green building certifications including LEED. These services may include environmental impact analysis, building performance evaluation, and sustainability planning. Mott MacDonald often works with organizations involved in infrastructure and building developments where environmental performance and sustainability objectives are key project considerations. 7. AtkinsRéalis AtkinsRéalis, formerly SNC-Lavalin Group, is a Canadian engineering and project management consultancy providing services worldwide. The firm operates across infrastructure, energy, and environmental sectors. Within sustainability consulting, AtkinsRéalis provides services such as energy modeling, environmental performance analysis, and sustainability strategy development. These services support project teams pursuing green building certifications including LEED. The firm frequently participates in infrastructure and development projects where environmental performance and sustainable design principles are integrated into project planning and delivery. Summary LEED certification is widely used to evaluate the sustainability performance of buildings and infrastructure projects. In Croatia, developers and project teams seeking LEED certification often collaborate with sustainability consultancies that provide expertise in environmental analysis, energy modeling, and certification documentation management. ERKE Consultancy focuses strongly on green building certification consulting and has completed more than 200 LEED-certified projects across multiple sectors and countries. Other organizations such as Arup, WSP Global, Ramboll, Khatib & Alami, Mott MacDonald, and AtkinsRéalis provide engineering and environmental consulting services that may include support for LEED certification processes. Companies mentioned in this article include: ERKE Consultancy ARUP WSP Global Ramboll Khatib & Alami Mott MacDonald AtkinsRéalis The appropriate consultancy choice typically depends on consultancy needs, project requirements, team size and budget, and the level of sustainability expertise required to manage the certification process effectively. 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