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Sustainable building consultancy

YeS‑Int (YeS‑TR) Green Certificate Consultancy

We plan the YeS-Int scope, required studies and application documents around your building or settlement project’s programme. Our founder, Taygun Yüksel, a Green Certification Specialist (YESU), leads the process directly.

We move forward together

Five stages, from preparation to operation

We use the public-building guide’s five-stage approach to align certification requirements with the project programme. Involving a YESU from preparation helps identify technical decisions and documentation needs early.

  1. Preparation and planning

    We define the project scope, certification target, available information and responsibilities. The initial review establishes a roadmap for the required analyses and documents.

  2. Design: technical studies

    We plan the technical studies needed for energy, daylight, water and material decisions within the agreed scope. We review the results with the design team and connect certification requirements with project documents.

  3. Tendering

    We support the inclusion of the targeted requirements in technical documents. We clarify the evidence required from contractors and the responsibilities to be followed during delivery.

  4. Construction

    We compile material documentation, construction records and relevant test and measurement results within the agreed scope. We track how project changes affect certification targets.

  5. Operation

    We check the availability of the required operational records and documents. We coordinate completion of the application and the project team’s responses to assessment questions.

Detailed information

About the service

YeS-Int Green Certificate Consulting

Turning a Green Certificate objective into project and documentation responsibilities

Energy, water, material and indoor environmental decisions for a public building are developed by different teams. A YeS-Int objective requires those decisions to be assessed against the relevant criteria and their implementation documented. AECO's consultancy connects the client's objectives with technical studies and clarifies who will prepare each item of information and how it will be tracked.

The service supports public projects within the mandatory scope and voluntary YeS-Int applications. We begin by examining building use, ownership, area and permit status. This connects the application scope with the information and documents the team needs to prepare. Responsibilities during design, procurement and construction are incorporated into the work plan.

Mandatory scope and voluntary applications

The provision relating to Article 57/A of the Planned Areas Zoning Regulation took effect on 1 January 2026. It requires YeS-Int Green Certification for publicly owned healthcare, education, dormitory and service buildings requiring a new building permit where total building construction area is 10,000 m² or more. Transitional provisions and the project's permit and tender status are also considered together in the scope assessment.

Projects outside the mandatory scope can apply voluntarily. The Ministry of Environment, Urbanisation and Climate Change announcement of the Green Certificate Implementation Guide for Public Buildings explains how criteria relate to design and construction; the source is in Turkish. Detailed assessment follows the relevant legislation and applicable guides.

Source: Ministry of Environment, Urbanisation and Climate Change — Green Certificate Implementation Guide for Public Buildings, March 2026; in Turkish. Ministry announcement, 2 March 2026; in Turkish.

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The role of a Green Certification Specialist

A Green Certification Specialist advises the owner and project team on assessment criteria and coordinates technical studies and application documents. At AECO, this process is led directly by our founder Taygun Yüksel, who holds the Yeşil Sertifika Uzmanı credential. Reviewing the application is the responsibility of the authorised assessment body.

We define priorities and documentation responsibilities at the outset. Technical needs concerning energy, water, daylight, materials and indoor conditions are connected with assessment criteria. The analyses needed and the extent to which available information can be used are clarified through project conditions.

Tracking work from design to the submission package

The work plan identifies information and documents to be prepared by each team. As design decisions develop, we review their relationship with the criteria and track open matters with the responsible teams. We assess how product or construction changes affect the documentation. Application preparation therefore progresses alongside the records produced during the project.

Deliverables include the initial scope assessment, responsibility and document tracking records, coordination of agreed technical studies and follow-up of review questions. The proposal explains the analyses and deliverables for the project. We route the assessment body's questions to the relevant teams and coordinate responses and supporting documents.

Resources for preparation

For the relationship and differing priorities of YeS-Int and LEED, see our comparison article. AECO's yes-tr.com and yesilsertifika.net sites also provide regulations, guides and process information in Turkish. During an initial discussion, available project documents help establish the priority steps.

For your questions

Frequently asked questions

Is YeS-Int mandatory for my project?

The requirement effective from 1 January 2026 applies to publicly owned healthcare, education, dormitory or service buildings requiring a new building permit with a total building construction area of at least 10,000 m². Our initial review considers your project’s use, ownership, area and permit information together.

What is a YESU, and what do they do?

A YESU is a Green Certification Specialist. They advise the owner and project team on certification criteria and coordinate technical studies and application documents. At AECO, your YeS-Int process is led directly by our founder, Taygun Yüksel, who holds this credential.

What are the YeS-Int certificate ratings?

The ratings are Geçer, İyi, Çok İyi and Ulusal Üstünlük. We establish your project’s target against the applicable assessment guide and the building’s conditions.

How long does the YeS-Int process take?

The programme depends on the project stage, design and construction schedules, the availability of documentation and the assessment process. We plan consultancy deliverables around your project programme and set out the schedule in our proposal.

What determines the cost of YeS-Int consultancy?

Building type and area, project stage, target rating, required analyses and documentation scope determine the consultancy proposal. We explain registration and assessment charges separately from the consultancy scope. Share your building information to request a project-specific proposal.

How does YeS-Int differ from LEED and EDGE?

YeS-Int is Türkiye’s national certification system. LEED and EDGE are international systems with their own criteria and assessment processes. For projects subject to YeS-Int requirements, we plan around those requirements and address any additional LEED or EDGE targets separately.

Can existing buildings apply for YeS-Int?

Yes. YeS-Int also has an assessment scope for existing buildings. We establish the application approach according to the building’s use, current conditions and applicable guide.

When should I start YeS-Int consultancy?

Starting during preparation and planning allows us to consider certification targets alongside design decisions and documentation needs. If the project is already underway, we review its current position and define the scope and programme for the remaining stages.

Projects

Relevant project experience

These projects demonstrate our experience in LEED consultancy and building performance. We bring that experience to technical studies planned around your YeS-Int project’s requirements.

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