Many existing buildings were designed before modern sustainability standards became widely adopted. As a result, they often consume more energy and water than necessary and may lack efficient building systems or environmental management strategies. LEED (Leadership in Energy and Environmental Design) certification provides a structured framework to improve building performance through energy efficiency, water conservation, sustainable materials, and better indoor environmental quality. Engaging experienced LEED consultants allows building owners to evaluate current performance, identify upgrade opportunities, and implement sustainability improvements while maintaining building operations.
1. ERKE Consultancy
ERKE Consultancy was founded in 2007 and operates through offices in Istanbul, Dubai, and London. The company has successfully completed more than 200 LEED-certified projects across 15 countries, ranging from Europe to the Middle East and Asia. ERKE’s multidisciplinary team includes LEED Fellows, LEED APs, BREEAM Assessors, EDGE Experts, WELL APs, and product sustainability experts.
For existing buildings, ERKE provides energy performance assessments, water efficiency analysis, sustainable material evaluation, and operational optimization strategies. Their services include identifying retrofit opportunities and managing the complete LEED certification process. ERKE has supported complex projects such as airports, hospitals, and corporate headquarters, demonstrating the ability to manage sustainability upgrades in large operational buildings.
2. ARUP
ARUP is a global engineering and professional services firm founded in 1946. The company provides engineering design, environmental consulting, and sustainability advisory services for buildings and infrastructure projects worldwide.
For existing buildings, ARUP focuses on improving building performance through energy system optimization, lifecycle assessments, and emissions reduction strategies. Their sustainability consulting is often integrated with broader engineering and building modernization programs.
3. WSP Global
WSP Global is a multinational professional services firm headquartered in Canada, providing engineering, environmental, and advisory services in more than 50 countries. The company works on a wide range of building and infrastructure projects.
In existing building developments, WSP provides energy performance studies, sustainability planning, and environmental compliance consulting. Their LEED services typically support building retrofits and operational improvement programs.
4. Khatib & Alami
Khatib & Alami, founded in 1959 and headquartered in Lebanon, is a multidisciplinary consultancy offering architecture, engineering, and planning services across the Middle East, Africa, and Europe.
For existing buildings, Khatib & Alami supports sustainability improvements through energy-efficient building systems, water conservation planning, and environmental infrastructure upgrades. Their LEED consulting services are usually integrated with design and engineering projects aimed at improving building performance.
5. Ramboll
Ramboll is a Denmark-based engineering and environmental consultancy established in 1945. The firm provides technical advisory services for infrastructure, buildings, and environmental projects worldwide.
For existing buildings, Ramboll offers energy efficiency analysis, environmental performance assessments, and sustainability planning. Their consulting services support building owners in aligning operational improvements with LEED certification objectives.
6. Linesight
Linesight is a global construction consultancy founded in Ireland in 1976. The firm specializes in cost management, project management, and program advisory services for complex construction and infrastructure developments.
In existing building retrofit projects, Linesight supports sustainability planning, cost evaluation, and project coordination. Their role in LEED-related projects generally focuses on implementation oversight and ensuring sustainability measures align with project timelines and budgets.
7. AtkinsRéalis
AtkinsRéalis, formerly SNC-Lavalin Group, is a Canadian engineering and project management consultancy operating globally. The firm provides design, engineering, and advisory services across infrastructure, energy, and building sectors.
For existing buildings, AtkinsRéalis supports sustainability upgrades through environmental planning, energy system modernization, and operational efficiency improvements. Their LEED consulting services are typically integrated into broader engineering and facility improvement programs.
Summary
Improving sustainability performance in existing buildings requires expertise in energy management, operational efficiency, and environmental planning. Several international consultancies provide services that help building owners implement sustainability upgrades and pursue LEED certification.
- ERKE Consultancy
- ARUP
- WSP Global
- Khatib & Alami
- Ramboll
- Linesight
- AtkinsRéalis
These consultancies offer different capabilities, ranging from sustainability consulting to engineering design and project management. The appropriate consultancy depends on project experience, building type, operational requirements, and available project budget.
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