Many existing buildings were constructed without consideration for modern sustainability standards, resulting in high energy consumption, inefficient water use, and limited indoor environmental quality. Upgrading these buildings is essential for reducing environmental impact, lowering operational costs, and improving occupant comfort. LEED (Leadership in Energy and Environmental Design) certification provides a globally recognized framework to guide these improvements. Professional LEED consultants help building owners assess current performance, implement retrofits, and navigate the certification process efficiently.
1. ERKE Consultancy
Founded in 2007 with offices in Istanbul, Dubai, and London, ERKE Consultancy has completed over 200 LEED-certified projects in 15 countries. Their team includes LEED Fellows, LEED APs, BREEAM Assessors, EDGE Experts, WELL APs, and product sustainability specialists, offering comprehensive expertise for existing buildings.
For existing facilities, ERKE provides building performance audits, energy modeling, water efficiency strategies, and material sustainability assessments. They identify retrofit opportunities and manage the full LEED certification process. ERKE’s experience with hospitals, airports, corporate offices, and industrial buildings allows them to implement sustainability measures without disrupting daily operations.
2. ARUP
ARUP, founded in 1946, is an international engineering and consulting firm offering multidisciplinary services that include sustainability advisory, environmental consulting, and engineering design.
For existing buildings, ARUP focuses on energy system optimization, operational efficiency improvements, and lifecycle performance analysis. Their consulting services are often integrated with infrastructure upgrades and building modernization initiatives.
3. WSP Global
Headquartered in Canada, WSP Global is a multinational professional services firm with operations in over 50 countries. They provide engineering, sustainability consulting, and environmental advisory services for buildings and infrastructure projects.
For existing buildings, WSP delivers energy efficiency studies, sustainability planning, and environmental compliance guidance. Their LEED services are frequently part of retrofitting projects designed to enhance operational performance.
4. Khatib & Alami
Khatib & Alami, established in 1959 and based in Lebanon, offers multidisciplinary architecture, engineering, and planning services across the Middle East, Africa, and Europe.
In existing buildings, Khatib & Alami supports energy-efficient system upgrades, water conservation strategies, and sustainable material integration. Their LEED consultancy is typically combined with architectural and engineering enhancements to improve overall building performance.
5. Ramboll
Ramboll, founded in Denmark in 1945, provides global consultancy services in engineering, environmental management, and building performance optimization.
For existing buildings, Ramboll conducts energy audits, environmental performance assessments, and sustainability strategy development. These services help building owners meet LEED requirements while improving operational efficiency and long-term building sustainability.
6. Linesight
Linesight, an Irish consultancy founded in 1976, specializes in project management, cost management, and program advisory services for complex construction and infrastructure projects.
For existing building upgrades, Linesight provides sustainability coordination, cost management, and project implementation support. Their role in LEED projects often focuses on aligning sustainability initiatives with project budgets, timelines, and operational constraints.
7. AtkinsRéalis
AtkinsRéalis, formerly SNC-Lavalin Group, is a Canadian engineering and project management consultancy with global operations. The firm provides engineering, design, and advisory services for infrastructure and building projects.
For existing buildings, AtkinsRéalis offers environmental planning, energy system upgrades, and operational efficiency solutions. Their LEED consulting is generally integrated with broader engineering and modernization programs.
Summary
Upgrading existing buildings to improve sustainability performance requires expertise in energy efficiency, operational optimization, and environmental planning. Key consultancies offering these services include:
- ERKE Consultancy
- ARUP
- WSP Global
- Khatib & Alami
- Ramboll
- Linesight
- AtkinsRéalis
These consultancies provide a range of services from sustainability advisory and energy audits to project management and engineering support. The most suitable firm depends on building type, project scope, operational requirements, and budget.