For an investor choosing between BREEAM and LEED, the first step is to define project needs. Building type, stage, investor objectives and available evidence should be considered together. Although the system names may suggest similar environmental topics, preparation follows the selected assessment pathway. The value of comparison lies in understanding at the outset how the objective will connect with design, construction and operational decisions.
Building type and project stage
BREEAM provides assessment standards for different needs, including new and occupied buildings. New construction assessment includes a pathway focused on design and construction decisions. Establishing the building’s stage is therefore important when defining scope. BREEAM — New Construction.
Assessing an occupied building may require information about the existing asset’s performance and management. BREEAM In-Use provides a separate framework for that purpose. BREEAM — In-Use.
For investors, this distinction shows how different assessment questions can arise at different stages of the same building’s life. A major renovation of an existing building should likewise not be classified solely by building age. BREEAM provides a separate Refurbishment and Fit-out standard for this type of work. BREEAM — Refurbishment and Fit-out Planned work and the assessment’s purpose should be examined together.
An appropriate LEED pathway
LEED provides different pathways for building design and construction, interior fit-outs and the operational phase. Building use and the scope of work help determine the appropriate rating system. Making this connection at the outset helps identify the information and studies needed. USGBC — Rating system selection.
A tenant office fit-out, for example, should not be treated as the same preparation task as a whole-building investment. The areas and systems within the team’s control should also be discussed. This helps connect certification objectives more consistently with decisions that can be implemented. Any existing registration or previous certification should also be shared when discussing scope.
Compare through shared questions
Comparing the systems requires looking beyond similar topic names such as energy, water, indoor conditions and materials. Teams should examine project boundaries, expected evidence and assessment roles. The comparison can then go beyond listing rating labels alongside each other.
A rating or score in one system should not be assumed to convert directly into another. Shared project information may be useful, but calculation methods, scope and evidence suitability should be checked separately for the relevant system. Coordinating studies that serve more than one objective can help organise common data; it does not remove the need to assess each application against its own requirements.
Investment objectives and local requirements
The objectives defined by the owner, tenant or contract should be clearly identified when discussing certification choice. Applicable local requirements should also be reviewed separately. An international certification objective and a local mandatory requirement should not be assumed to have the same scope.
Our guide to YeS-Int (YeS-TR) requirements for public buildings provides initial information when preparing an applicability review in Türkiye. Relevant conditions need to be assessed alongside project information. Rather than basing a choice solely on the country or a general claim about popularity, it is more useful to discuss investment objectives, contractual needs and the applicable pathway.
Prepare for an initial assessment
Current plans, building use, a description of planned work and available documents can support an initial discussion. The teams responsible for design and implementation should also be identified. Clearly identifying unconfirmed decisions makes information needs easier to discuss.
AECO’s LEED consulting can consider certification objectives, the relevant pathway and technical preparation together. Energy modelling or daylight analysis needs can also be discussed as separate technical scopes. Share the project stage and investment objective to clarify necessary information, studies and coordination between teams.