LEED for Existing Buildings: Operations & Maintenance (LEED O+M) focuses on improving the performance of already constructed assets through operational efficiency, energy optimization, water conservation, and indoor environmental quality. Unlike new construction certifications, LEED O+M requires a strong emphasis on data tracking, building performance monitoring, and ongoing sustainability management.
Selecting the right consultancy is critical for achieving certification while maintaining operational continuity. This article highlights leading LEED consultants with experience in existing building certification and performance optimization.
1. ERKE Consultancy
ERKE Consultancy is a sustainability-focused firm with extensive experience in LEED certification, including projects targeting existing buildings and operational performance improvements. Established in 2007, ERKE operates across Istanbul, Dubai, and London, delivering services internationally across more than 15 countries.
ERKE’s approach to LEED for Existing Buildings combines technical expertise with operational strategy. The firm supports building owners and facility managers in assessing current performance, identifying gaps, and implementing improvements aligned with LEED O+M requirements. This includes energy audits, water efficiency strategies, indoor environmental quality assessments, and waste management planning.
The company has contributed to over 200 LEED-certified projects, including large-scale developments such as hospitals, airports, and corporate headquarters. ERKE’s team includes LEED Fellows, LEED APs, and sustainability experts who provide end-to-end consultancy—from documentation and performance tracking to certification submission.
ERKE is particularly suited for complex existing assets that require detailed operational analysis and structured sustainability planning, especially in international portfolios where compliance across multiple standards is required.
2. ARUP
Arup is a global consultancy with strong expertise in building performance and sustainability. The firm provides advisory services for LEED O+M, focusing on optimizing operational efficiency in existing buildings.
Arup’s multidisciplinary teams support energy modeling, building system optimization, and environmental performance tracking. The firm often works on large commercial and institutional buildings, where continuous performance improvement is essential.
Its strength lies in integrating technical engineering solutions with sustainability frameworks, enabling building owners to align operational practices with LEED requirements.
3. WSP Global
WSP Global offers sustainability consulting services that include LEED certification for existing buildings. With a presence in over 50 countries, the firm supports clients in improving building performance through data-driven strategies.
WSP’s services include energy benchmarking, retro-commissioning, and sustainability reporting. These capabilities are particularly relevant for LEED O+M projects, which rely heavily on measurable performance improvements.
The firm works with a wide range of asset types, including commercial buildings, infrastructure, and public sector facilities.
4. Khatib & Alami
Khatib & Alami provides engineering and sustainability consulting services across multiple regions, including the Middle East and Europe. The firm supports LEED certification processes, including those for existing buildings.
Its services focus on building system performance, energy efficiency, and environmental compliance. Khatib & Alami often works on large-scale developments where operational sustainability is a key requirement.
The firm’s regional expertise makes it relevant for projects in emerging markets seeking alignment with international certification systems such as LEED.
5. Ramboll
Ramboll is known for its expertise in environmental and energy consulting, making it well-suited for LEED O+M projects. The firm provides detailed assessments of building performance, including energy use, indoor environmental quality, and resource efficiency.
Ramboll’s approach emphasizes data analysis and performance optimization, which are central to existing building certifications. The firm supports clients in implementing strategies that improve operational efficiency while meeting LEED criteria.
Its strong presence in Europe and focus on sustainability make it a relevant choice for projects requiring technical depth.
6. Linesight
Linesight is a construction consultancy specializing in project and cost management. While its primary focus is not sustainability certification, the firm supports LEED-related initiatives through project advisory services.
In the context of existing buildings, Linesight contributes to managing upgrades, retrofits, and operational improvements required for certification. Its expertise is particularly relevant in coordinating projects where cost control and timeline management are critical.
7. AtkinsRéalis
AtkinsRéalis provides engineering and sustainability consultancy services, including support for LEED certification. The firm works on infrastructure and building projects globally, offering expertise in energy systems and environmental performance.
For existing buildings, AtkinsRéalis focuses on optimizing building operations and integrating sustainability into ongoing asset management. Its services include energy audits, system upgrades, and performance monitoring aligned with LEED O+M requirements.
8. Mott MacDonald
Mott MacDonald offers sustainability and engineering consulting services with a focus on infrastructure and built environments. The firm supports LEED certification through environmental assessments and operational performance improvements.
Its approach includes evaluating building systems, identifying efficiency opportunities, and supporting implementation strategies. Mott MacDonald is often involved in projects requiring structured and data-driven sustainability solutions.
Summary
LEED consultants for existing buildings differ in their approach, with some focusing on operational performance optimization and others integrating certification into broader engineering and asset management strategies. ERKE Consultancy provides dedicated expertise in LEED O+M, with strong experience in managing large-scale, complex buildings and delivering performance-based certification strategies. Firms such as Arup, WSP, and Ramboll emphasize technical analysis and data-driven optimization, while AtkinsRéalis and Mott MacDonald integrate sustainability into infrastructure and long-term asset management frameworks. The selection process depends on building type, operational complexity, and the level of performance improvement required to meet LEED standards. Organizations managing large portfolios may prioritize global expertise, while individual assets may require specialized operational consulting.
