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Project facts

Certification
LEED Gold
Rating system
LEED v4 New Construction
AECO’s role
Certification consultancy · Building performance modelling

LEED consultancy and energy modelling for the ERN Holding Headquarters major renovation under LEED v4 BD+C: New Construction and Major Renovations. The project was certified at Gold level in June 2026. Location: Ankara, Türkiye.

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PROJECT FILE

Project details

Envelope, glazing and building systems were assessed together through an energy model for the major renovation. The pre-renovation envelope was compared with the new design to examine the modelled effect of the decisions.

Project analysis

Energy modelling informed envelope, glazing and building-system decisions during the major renovation of the Ankara headquarters. The project achieved LEED Gold with 64 points.

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Terms used in the analyses
sDA
Spatial Daylight Autonomy — the share of floor area that reaches 300 lux from daylight alone for at least half of the occupied hours (IES LM-83).
ENERGY STAR
ENERGY STAR score — a 1–100 operational performance score from the US Environmental Protection Agency, comparing a building’s energy performance with that of similar buildings.
Tier 1
Tier 1 — the top category of the LEED renewable energy credit, which includes renewable energy generated on site.