LEED Certification Explained: Levels, Process and v5

LEED — Leadership in Energy and Environmental Design — is the green building rating system developed by the U.S. Green Building Council (USGBC). It is one of the most widely recognised sustainability certifications in the world, used on offices, schools, hospitals, interiors and existing buildings across many countries, including projects in Singapore.

This article explains how LEED works: the rating systems, how points translate into certification levels, the process a project goes through, what changed with the current version, LEED v5, and how it sits alongside Singapore’s own BCA Green Mark scheme. It is written from a structural and building-design perspective, with attention to the decisions that affect a project early.

What LEED is and who runs it

LEED is a voluntary, points-based framework. A project team chooses the relevant rating system, meets a set of mandatory prerequisites and then earns points by achieving optional credits. The rating system is developed by USGBC, while project review and certification are carried out by Green Business Certification Inc. (GBCI), which verifies the documentation submitted by the team.

Because LEED is voluntary outside jurisdictions that reference it in law, owners pursue it for a range of reasons: corporate sustainability commitments, tenant and investor expectations, international portfolio consistency and the discipline that a structured framework brings to design decisions.

The LEED rating systems

LEED is organised by project type rather than as a single checklist. The main rating systems are:

Building Design and Construction (BD+C) — new buildings and major renovations.
Interior Design and Construction (ID+C) — fit-outs of commercial interiors.
Operations and Maintenance (O+M) — existing buildings, assessed on actual performance in use.

USGBC also runs systems for cities and communities, and there are adaptations within each system for building types such as schools, healthcare and data centres. Choosing the right system and version at the outset is the first formal step, because each has its own prerequisites and minimum program requirements.

How LEED points and certification levels work

A project must satisfy every prerequisite in its rating system; missing one means no certification regardless of points. Above that baseline, credits earn points across themes such as location and transport, sustainable sites, water efficiency, energy and atmosphere, materials and resources, and indoor environmental quality, with additional points available for innovation and regional priorities.

According to USGBC, the certification levels are:

Certified: 40–49 points
Silver: 50–59 points
Gold: 60–79 points
Platinum: 80 points and above

In practice, the energy credits carry significant weight, which is why the building envelope, shading, systems efficiency and on-site renewables are decided early. Materials credits, including those related to embodied carbon and environmental product declarations, increasingly draw the structural engineer into the conversation, because the frame is often the largest single contributor to a building’s embodied carbon.

LEED v5: what changed

LEED v5 is the current version. USGBC states that it is available for BD+C, ID+C and O+M projects, and its reference guides were issued as a 2025 launch edition. Earlier versions, v4 and v4.1, are being phased out on a schedule of registration and certification deadlines that USGBC publishes; projects already registered under those versions follow their own timelines.

The most significant change is in emphasis. USGBC frames LEED v5 around three impact areas — decarbonisation, quality of life, and ecological conservation and restoration — with a much stronger focus on carbon, both operational and embodied. Projects are pushed to quantify and plan for emissions reductions rather than simply demonstrate efficient equipment. Registration and documentation for v5 projects are handled through USGBC’s Arc platform. Because rules and deadlines in this area evolve, always check the current requirements on usgbc.org before committing a project to a particular version.

What it means for structure

The heavier focus on embodied carbon makes structural choices more visible. Efficient spans, lean member sizing, cement replacement in concrete, recycled-content steel and reuse of existing structure all become levers. Our article on green concrete looks at the material side of that discussion.

The certification process

The process follows a clear sequence. The team selects the rating system and version and confirms the project meets the minimum program requirements. The project is registered, a target scorecard is drawn up, and credits are assigned to members of the design team. Documentation is gathered through design and construction, then submitted for review. GBCI reviews it, may raise comments for clarification, and issues the final certification level.

The success of a LEED project is largely decided at concept stage. Orientation, massing, façade design and structural system set the energy and carbon outcomes long before documentation begins. Many of these decisions align with the principles discussed in our guide to sustainable architecture and in passive house design.

Is LEED worth pursuing?

The value of certification depends on the owner’s goals. For a multinational occupier with portfolio-wide commitments, a recognised international label can simplify reporting and tenant communication. For other projects, the main benefit may simply be the structure the framework brings: clear targets, assigned responsibilities and documented performance. Against that sit the costs of additional modelling, commissioning, documentation and certification fees, which should be weighed honestly at the start.

Whichever way the decision goes, the underlying measures — good orientation, efficient envelopes, right-sized systems, lower-carbon materials and healthy indoor environments — are worth pursuing on their own merits. A rating system is a means of verifying them, not a substitute for designing them in.

LEED and BCA Green Mark in Singapore

In Singapore, the national scheme is the BCA Green Mark, administered by the Building and Construction Authority. Unlike LEED, Green Mark is embedded in local regulation: minimum environmental sustainability standards apply to new buildings and to certain existing buildings undergoing major works, above specified size thresholds, and the scheme is calibrated to the tropical climate, where cooling dominates energy use.

LEED is therefore usually pursued in addition to Green Mark, not instead of it — most often by multinational owners or tenants who want a consistent certification across a global portfolio. The two schemes overlap in intent but differ in structure, metrics and documentation, so a project seeking both needs a team that understands where the requirements align and where they diverge.

Frequently asked questions

What does LEED stand for?

LEED stands for Leadership in Energy and Environmental Design. It is the green building rating system developed by the U.S. Green Building Council, with project review and certification carried out by Green Business Certification Inc.

What are the LEED certification levels?

USGBC lists four levels: Certified at 40–49 points, Silver at 50–59 points, Gold at 60–79 points and Platinum at 80 points or more. All prerequisites must be met before any points count towards a level.

Is LEED v5 the current version?

Yes. USGBC describes LEED v5 as currently available for Building Design and Construction, Interior Design and Construction, and Operations and Maintenance projects, while v4 and v4.1 are being phased out according to published deadlines that should be checked on usgbc.org.

Is LEED required in Singapore?

No. LEED is voluntary in Singapore. The regulatory green building framework is BCA Green Mark, whose minimum standards apply to new buildings and certain major retrofits above specified size thresholds. Some owners pursue LEED in addition, usually for portfolio or tenant reasons.

How does structure affect a LEED rating?

The structure influences embodied carbon, which carries more weight under LEED v5, as well as material credits. Efficient structural layouts, lower-carbon concrete and steel, and reuse of existing frames can all support a project’s sustainability goals.

Pursuing a green building rating and want a structure that supports your carbon goals? Talk to our consultancy or get in touch.