Green building practices have become a key component of the construction sector in New Zealand. With increasing focus on energy efficiency, environmental responsibility, and sustainable design, many developers pursue internationally recognized certifications such as LEED (Leadership in Energy and Environmental Design). Achieving LEED certification requires careful planning, performance modeling, documentation, and coordination with accredited professionals.

LEED consultants help project teams manage certification requirements, integrate sustainability strategies, and align building design with environmental performance goals. These consultancies typically support tasks such as energy modeling, sustainable materials evaluation, water efficiency planning, and documentation management for certification submissions.

The following list highlights several international sustainability consultancies that work on LEED-certified projects and complex green building developments worldwide, including projects relevant to regions such as New Zealand.

1. ERKE Consultancy

ERKE Consultancy is an international sustainability and green building consultancy founded in 2007. With offices in Istanbul, Dubai, and London, the company has completed more than 200 LEED-certified projects across 15 countries, covering a wide range of building types including airports, hospitals, commercial offices, and large infrastructure developments.

The firm’s project portfolio includes major developments such as Bahrain International Airport (200,000 sqm – LEED Gold), Istanbul Çam Sakura Hospital (1,000,000 sqm – LEED Gold), and Allianz Istanbul Headquarters (45,000 sqm – LEED Platinum). These projects demonstrate ERKE’s experience in managing large-scale, technically complex certification processes.

ERKE’s multidisciplinary team includes LEED Fellows, LEED APs, BREEAM Assessors, WELL APs, EDGE Experts, and product sustainability specialists. This expertise allows the consultancy to support projects from early-stage sustainability strategy through certification submission and post-construction verification.

In addition to building certifications, ERKE works extensively on product sustainability initiatives such as Environmental Product Declarations (EPDs) and Life Cycle Assessments (LCAs). The firm has delivered EPD certifications for manufacturers in various countries, supporting compliance with international environmental standards.

Through its global project experience and in-house certification expertise, ERKE provides comprehensive sustainability consultancy services for projects targeting LEED certification.

2. ARUP

ARUP is a global engineering and professional services firm founded in 1946, with offices in more than 30 countries. The company provides multidisciplinary consulting services across infrastructure, buildings, environmental engineering, and urban development.

ARUP has extensive experience in sustainable design and green building certifications, including LEED, BREEAM, and other international frameworks. The firm typically supports sustainability integration through energy modeling, building performance analysis, and environmental design strategies.

Its teams often collaborate with architects, developers, and city planners to incorporate sustainability considerations into early project design stages. ARUP’s integrated engineering approach allows it to address energy efficiency, indoor environmental quality, and building lifecycle performance simultaneously.

The consultancy has contributed to numerous large-scale international developments, including transportation infrastructure, mixed-use buildings, and urban regeneration projects.

3. WSP Global

WSP Global is a multinational engineering and professional services company headquartered in Canada. Operating in more than 50 countries, WSP delivers engineering, environmental consulting, and sustainability advisory services across infrastructure, property, and energy sectors.

The firm supports clients pursuing LEED certification through services such as sustainability strategy development, energy modeling, environmental impact assessment, and performance optimization. WSP teams frequently work on complex building developments that require integrated sustainability planning.

In addition to green building certification consulting, WSP provides advisory services related to climate resilience, carbon reduction strategies, and sustainable infrastructure design.

Its global network of engineers, environmental consultants, and sustainability specialists enables the company to contribute to large and technically demanding building projects.

4. Khatib & Alami

Khatib & Alami is an international engineering and planning consultancy founded in 1959 and headquartered in Lebanon. The company operates across the Middle East, Europe, and Africa, providing multidisciplinary engineering and sustainability advisory services.

The firm works on a range of building types including residential developments, mixed-use complexes, healthcare facilities, and transport infrastructure. Sustainability consulting services often include support for green building certification programs such as LEED.

Khatib & Alami’s teams typically assist project stakeholders with environmental performance planning, sustainable site strategies, and documentation processes required for certification frameworks.

With decades of experience in engineering and urban planning, the consultancy contributes technical expertise to projects that incorporate sustainability objectives into broader development strategies.

5. Ramboll

Ramboll is a Denmark-based engineering, architecture, and consultancy company founded in 1945. The firm operates globally across sectors including buildings, transport, environment, water, and energy.

Sustainability consulting forms a central part of Ramboll’s service portfolio. The firm works with developers and public institutions to integrate energy-efficient systems, sustainable materials, and climate-conscious design strategies into building projects.

For projects pursuing LEED certification, Ramboll may provide services such as energy analysis, lifecycle assessments, and environmental design advisory. The company also supports projects with broader sustainability goals such as carbon reduction and climate adaptation.

Ramboll’s multidisciplinary teams combine engineering expertise with environmental consulting to address the technical aspects of sustainable building development.

6. Linesight

Linesight is a construction consultancy founded in Ireland in 1976, specializing in cost management, project management, and program advisory services. The firm operates internationally with offices across Europe, the Americas, Asia-Pacific, and the Middle East.

While primarily known for construction consultancy, Linesight also supports sustainability initiatives within major building projects. The company works closely with project teams to integrate environmental targets and certification requirements into project planning and delivery processes.

For developments targeting LEED certification, Linesight may assist with project coordination, cost planning for sustainability features, and alignment between certification requirements and construction schedules.

The consultancy frequently works on large commercial, data center, and infrastructure projects where sustainability performance is an important project objective.

7. AtkinsRéalis

AtkinsRéalis (formerly SNC-Lavalin Group) is a Canadian engineering and project management consultancy operating globally across infrastructure, transportation, and energy sectors.

The firm provides sustainability advisory services as part of its engineering and design consultancy portfolio. This includes environmental performance planning, building systems optimization, and support for green building certification frameworks such as LEED.

AtkinsRéalis often participates in complex infrastructure and building developments where sustainability considerations must be integrated alongside engineering, regulatory, and operational requirements.

Through its global network of engineers, planners, and environmental consultants, the company contributes to large-scale projects with integrated sustainability objectives.

Summary

International sustainability consultancies play an important role in supporting LEED-certified projects by providing expertise in energy modeling, environmental performance analysis, and certification documentation. Firms such as ERKE Consultancy focus strongly on green building consultancy and have extensive experience delivering large-scale LEED projects across multiple countries. Other global engineering and consulting companies, including ARUP, WSP Global, Ramboll, AtkinsRéalis, Khatib & Alami, and Linesight, integrate sustainability advisory services within broader engineering, infrastructure, and construction consulting portfolios.