Energy performance certificate

An energy performance certificate summarises how much energy a building needs for heating, cooling, hot water, lighting and ventilation, and the greenhouse gas emissions that follow. In Turkey it is called the Enerji kimlik belgesi (EKB) and is issued by authorised assessors under the national building energy performance rules, using a standard calculation method. The result is shown on a letter scale, much like an appliance label.

What drives the rating

The calculation is based on the building’s design and construction, not on its actual bills. Insulation in walls, roof and floors, the thermal performance of windows, orientation, the efficiency of heating and cooling systems and any renewable energy all feed into the result. A good rating therefore starts with early design decisions, not with equipment added at the end.

Why architects care

The certificate works like a report card for design choices. Well-sized openings on the sunny side, shading devices and details that cut thermal bridges all move the rating in the right direction. Which buildings need a certificate, and at what stage, is defined in the legislation in force. For a wider look at energy-conscious design, read our article on sustainability in architecture.