YeS-Int requirements apply to publicly owned healthcare, education, dormitory and service buildings requiring a new building permit where total building construction area is 10,000 m² or more (Planned Areas Zoning Regulation, Art. 57/A, in force since 1 January 2026). The same project may also pursue LEED. The design team then needs to organise energy, material and indoor environmental information for both assessments. A shared work plan considers reusable technical inputs alongside evidence specific to each system. Our YeS-Int and LEED comparison article explains their different priorities.
When does joint execution come up?
The YeS-Int requirement comes with the rules governing publicly owned buildings; the general framework is covered in our public buildings process article and requirement guide. LEED relates to the project's objective; LEED is addressed through different rating systems developed by USGBC. USGBC — LEED.
Their presence in one project does not mean they can replace each other. A mandatory YeS-Int application does not substitute for a LEED assessment, and a LEED objective does not remove YeS-Int conditions. Each system has conditions to be met from its own current documents. The benefit of running them together is carrying out the shareable technical work these conditions require in a single structure.
Shared technical work
Energy performance is relevant to both systems; in YeS-Int this area is followed under the EKV (Enerji Kullanımı ve Verimliliği) module. Geometry, material and system information can be prepared from shared building data. Calculation methods, baselines and reporting requirements are checked separately for each system; that review establishes whether the same output can be used. This is not automatic: assumptions, comparison structure and reporting are reviewed separately for each system. A calculation prepared for one system should not be assumed to transfer directly to the other.
Measurements and tests carry a similar sharing logic. A measurement taken on the building shows a fact belonging to it; whether it counts as evidence in a given system depends on that system's evidence rules. Material documents are the third shared area: safety data sheets and environmental declarations are collected at building level, and both assessments can draw on this pool according to their own rules. Indoor environment reviews and daylight analyses follow the same logic; the analysis is performed on the building, its acceptance belongs to the system.
Aligning phases
Decisions taken at the design stage shape the evidence needs of both systems together. When energy strategy, material selection and indoor environment targets are set early, which decision requires which document can be seen from the start. Change management is decisive at the construction stage: a material substitution may invalidate one system's document while also affecting the other's; site records should be kept current for both assessments. At handover, commissioning and verification records support the preparation of evidence that may be requested during the operating period. Planning phases together helps reduce repeated work and conflicting decisions.
Document and team coordination
Coordination starts with stating clearly which document will be used in which system at which stage. Keeping documents in a single pool with defined naming and currency information reduces the need to collect them twice. On the YeS-Int side, the Ministry's public buildings implementation guide lists the areas respectively as BBT (Bütünleşik Bina Tasarımı Yapım ve Yönetimi), YMD (Yapı Malzemesi ve Yaşam Döngüsü Değerlendirmesi), İOK (İç Ortam Kalitesi), EKV (Enerji Kullanımı ve Verimliliği), SAY (Su ve Atık Yönetimi) and İNO (İnovasyon). Ministry of Environment, Urbanisation and Climate Change — Public Buildings Green Certificate Implementation Guide Mapping these headings one-to-one onto LEED categories is not a valid method; some decisions touch more than one heading in both systems, while some find a counterpart in only one. Each heading's owner, document owner and schedule should be defined at the project's start.
Each system's rules remain separate
Running together is not equating the systems. The "no one-to-one counterpart" principle is also the basis of the joint execution scenario: what is shared is the technical work; acceptance and outcome remain separate.
AECO's contribution
AECO's YeS-Int green certificate consulting and LEED consulting services support building the evidence plan and work schedule together where both systems must run on the same project. Assessing the needs of the two systems together at the start of the process reduces repeated work and helps decisions be taken consistently.