_If choosing one green building certification, should it be LEED, TREES, or EDGE?

LEED vs TREES vs EDGE: Which Green Building Certification Should You Choose?

By Knight Frank Thailand ESG Department

FAQ: If choosing one green building certification, should it be LEED, TREES, or EDGE?

The short answer is that no single standard is "the best" for every project. The three certifications were designed to address different needs in terms of target users, scope of assessment, and corporate objectives. The right choice depends on the target tenant profile, asset type, budget, timeline, and the project's long-term objectives.

This article summarises the key differences across the three standards and presents the framework Knight Frank uses when advising clients.

Part 1: Overview of Each Standard

LEED (Leadership in Energy and Environmental Design) was developed by the U.S. Green Building Council (USGBC) and launched in 2000. It is the most internationally recognised green building certification, with four levels — Certified, Silver, Gold, and Platinum — and covers multiple project types including New Construction (BD+C), Existing Buildings Operations & Maintenance (O+M), Interior Design and Construction (ID+C), and Neighborhood Development (ND). Its assessment criteria span multiple areas including site and transportation, water use, energy, materials, indoor environmental quality, and innovation.

TREES (Thai's Rating of Energy and Environmental Sustainability), known locally as Thai Green Building, was developed by the Thai Green Building Institute (TGBI) with the objective of guiding the construction industry toward environmentally responsible architectural design and construction, supporting occupant wellbeing, and improving the productivity of occupants in a comprehensive manner — calibrated for Thailand's hot and humid climate. TREES has four levels — Certified, Silver, Gold, and Platinum — and covers several project types including TREES-NC (New Construction), TREES-EB (Existing Buildings), TREES-CS (Core and Shell), and TREES-SOOK (Healthy Building).

EDGE (Excellence in Design for Greater Efficiencies) was developed by the International Finance Corporation (IFC) under the World Bank Group, with the objective of making buildings more sustainable, resource-efficient, and cost-effective. EDGE focuses on assessing resource efficiency across three core areas — energy, water, and materials. EDGE has three levels: EDGE Certified (at least 20% savings across all three areas), EDGE Advanced (at least 40% energy savings and 20% on the other two areas), and Zero Carbon.

Part 2: Comparison Table

Note: Timelines and costs above are indicative. Actual figures vary by project type, size, and complexity.

Part 3: Factors to Consider When Choosing

1. Target tenants or end-users

For office projects targeting multinational corporate tenants with corporate-level ESG mandates, LEED is typically the standard those tenants are most familiar with. Conversely, for projects targeting primarily Thai-market tenants or seeking to demonstrate commitment to a domestically developed standard, TREES is a sufficient choice. For residential, hospitality, or other building types where the primary objective is resource reduction, EDGE is a lower-resource option.

2. Building type and size

LEED, TREES, and EDGE can all certify a wide range of building types and sizes — offices, residential, hospitality, factories, or warehouses. The difference lies in the fit between the standard's process complexity and the scope and type of the project.

LEED has the broadest set of assessment criteria, including indoor environmental quality, site selection, and innovation. This makes it well-suited to projects that need to demonstrate sustainability across multiple dimensions; particularly Grade A offices, corporate headquarters, and projects with the capital and operational capacity to follow LEED's process.

TREES covers a similar breadth of criteria, recalibrated for Thai materials and regulations. It is well-suited to projects that still need to demonstrate sustainability across multiple dimensions in Thailand that prefer a standard developed in the local context.

EDGE focuses specifically on resource efficiency across three dimensions (energy, water, materials) rather than the wider sustainability scope of LEED or TREES. This narrower focus results in a lighter process, which tends to suit residential, hospitality, and commercial projects that primarily want to demonstrate resource efficiency without extensive sustainability demonstration across multiple dimensions.

3. Budget and internal team resources

3.1 Certification body fees (as of May 2026)

• On average, LEED carries the highest fees in this group. It has both a registration fee and a certification fee, with the certification fee calculated based on building area in square metres.
• TREES also has a registration fee and a certification fee, but the certification fee is structured in tiered bands.
• The certification fee depends on the chosen provider. For instance, if certifying through GBCI, the fee is calculated based on the total floor area. Conversely, if certifying through Sintali, a flat fee is charged regardless of the building's size.

3.2 Consultant fees

On average, LEED carries the highest consultant fees in this group, owing to the most detailed data requirements. The following points relate specifically to LEED Version 5.

For New Construction (BD+C), the project requires in-depth Energy Modelling to forecast energy use against ASHRAE 90.1 (Version 2019 or 2022). The project must also go through Commissioning (Cx) to verify, install, and test mechanical and electrical systems — including HVAC, electrical systems, machinery, and readiness for full electrification — prior to handover, to ensure the building performs as designed (typically requiring approximately 9-10% additional energy savings compared with v4.1).

For Existing Buildings (O+M), the assessment uses actual resource consumption, with mandatory criteria for building energy performance against ASHRAE 90.1 (Version 2019 or 2022). The project must submit 12 months of actual operating data, with performance scores aligned to Decarbonization criteria, and a more rigorous Retro-Commissioning process than v4.1.

TREES has lower consultant fees. While it requires the same energy modelling and commissioning workflow as LEED, TREES continues to reference ASHRAE 90.1 Version 2007 or whatever is specified by ministerial regulation for New Construction; for Existing Buildings, it assesses operational energy use and analyses energy conservation measures at the ASHRAE Level 1 Walk-Through level. This reduces consultant man-days and therefore consultant costs.

EDGE focuses specifically on reducing energy use, water use, and construction materials, which significantly reduces documentation effort. Energy modelling can also be performed within the EDGE software itself, further reducing costs. However, EDGE carries a separate EDGE Auditor fee in addition to the consultant fee — a third party who reviews and certifies the project. This fee may or may not be bundled with the consultant fee depending on the arrangement.

3.3 Other associated costs

The ultimate objective of LEED, TREES, and EDGE is to certify building design that is environmentally responsible, reduces resource use, and reduces greenhouse gas emissions. Associated costs go toward upgrading building systems, improving the building envelope, and supporting occupant wellbeing. These costs generally fall into the following categories:

1. Building envelope — to reduce cooling energy loads
2. MEP systems — to increase efficiency of the building's primary energy-consuming systems
3. Lighting systems — to reduce electricity use and maximise use of daylight
4. Water systems — to reduce potable water use
5. Renewable energy — to reduce greenhouse gas emissions
6. Indoor environmental quality — to improve occupant wellbeing
7. Environmentally responsible construction materials — to reduce environmental impact
8. Green transportation support — to reduce greenhouse gas emissions from access to the building

Research in 2025 indicates that the green premium for new buildings typically falls within a range of approximately 2-10% of construction cost, depending on the targetcertification level. Existing building retrofits typically incur higher costs given that installed systems must be modified, although operational costs are typically reduced over time. EDGE typically requires the lowest upgrade investment in this group, given its focus on three categories — energy, water, and materials.

3.4 Recertification

• LEED BD+C is a design and construction certification — a one-time award once the project is certified.
• LEED O+M, which addresses operational performance, requires periodic recertification per USGBC's specified cycle, typically every three years.
• TREES is a one-time certification for both BD+C and O+M variants.
• EDGE is a one-time certification but for EDGE ZERO requires recertification every four years.

4. Timeline

If a project needs certification before opening — for marketing purposes or to meet tenant procurement cycles — EDGE is the fastest option. By contrast, LEED and TREES require planning from the early project stages so that the standard's requirements can be fully met.

5. Financing and capital strategy

If the project plans to access Green Loans, Sustainability-Linked Loans, or Green Bond issuance, holding a green building certification that meets the lender's or bond arranger's criteria is a meaningful factor. In Thailand, the reference framework increasingly shaping these decisions is Thailand Taxonomy — the classification system for sustainable economic activities developed by the Bank of Thailand and the Securities and Exchange Commission (SEC), in coordination with related agencies.

Thailand Taxonomy criteria for the three standards:

LEED requires Gold or Platinum certification, plus energy performance at least 30% above ASHRAE 90.1 (latest version). For debt instruments, the LEED certification must be issued within five years before bond issuance, and the instrument tenor is limited to six years.
TREES applies the same criteria as LEED — Gold or Platinum plus 30% above ASHRAE 90.1 (latest version). For debt instruments, the TREES certification must be issued within five years before bond issuance, and the instrument tenor is limited to six years.
EDGE has a less stringent threshold, requiring only EDGE Certified (the entry level, with at least 20% resource savings).

6. Long-term strategy, sale plans, and disposition to real estate funds

If the project plans to sell or refinance in the future, targeting domestic or international institutional investors, LEED certification typically makes the sale process smoother — particularly when the asset can demonstrate measurable reductions in energy use, water use, and greenhouse gas emissions. TREES and EDGE are better suited to projects oriented toward long-term holding within Thailand.

Part 4: Common Scenarios

Grade A office building in a CBD where most tenants are multinational corporations or companies with ESG targets — LEED is the primary choice, with additional of another wellbeing certification such as WELL Certification or Fitwel considered as an addition for tenants who prioritise occupant wellbeing.

Office buildings in secondary cities or outside Bangkok — TREES is often the most cost-appropriate choice if the project wants to address sustainability across multiple environmental dimensions; EDGE is a good option for projects focused specifically on energy, water, and materials.

Condominium and housing developments — EDGE is often the most cost-effective option and can be used to communicate energy and water savings to buyers in a market that is beginning to value these.

Hotels and resorts — EDGE is often a suitable starting point; luxury hotel chains with group-level sustainability policies may also require LEED.

Factories and warehouses — TREES or LEED, depending on whether the end-user is a Thai or international corporation.

Projects financed through IFC or its partner network — EDGE typically aligns directly with the lending conditions.

Part 5: Pursuing Multiple Certifications Simultaneously

Some projects pursue more than one certification, such as LEED + TREES or LEED + WELL. Doing so can broaden appeal across tenant and investor groups, but the additional cost and complexity of the building upgrade process must be weighed carefully. Engaging an advisor from the design stage allows some documentation and data to be shared across certifications, reducing the total cost of the process.

Recommended Decision Process

1. Define the target tenant or end-user profile and their expectations
2. Confirm the project type, size, and current stage
3. Assess the available budget
4. Consider short- and long-term financing plans
5. Conduct a Pre-Assessment with an advisor to identify gaps and feasibility for each standard

The Knight Frank Thailand ESG Advisory team can provide an initial assessment based on your project details and recommend the most suitable standard.

Contact our team for an initial consultation, free of charge.