The comfort of a home is measured not only by its floor area or view, but also by how warm it stays in winter and how cool it stays in summer. This is where the energy performance certificate (known in Türkiye as EKB, Enerji Kimlik Belgesi) comes in: an official document that explains a building's energy performance in terms anyone can understand. In this guide we cover what the certificate is, the energy classes from A to G, the role of thermal insulation and the right windows, and how an energy-efficient building improves everyday life.
What Is an Energy Performance Certificate?
An energy performance certificate shows how much energy a building needs for heating, cooling, hot water, lighting and ventilation, the related greenhouse gas emissions and the building's energy class. In Türkiye it is issued under the Regulation on Energy Performance of Buildings and prepared by authorised energy certificate experts using the official calculation method.
For new buildings, the certificate is among the documents required during the occupancy permit (iskân) process. For existing buildings, it may be requested in sale and rental transactions. The certificate is generally valid for ten years. Since practical details can change over time, we recommend confirming the current rules with the relevant authorities or an expert.
What Do Energy Classes A to G Mean?
Buildings are classified from A to G according to their energy consumption. Class A represents the most efficient buildings and class G the least efficient. The class is determined by comparing the building with a reference building of similar characteristics.
- Classes A and B: Buildings with well-designed insulation, windows and mechanical systems and low energy demand.
- Class C: Generally known as the minimum level targeted for new buildings in the regulations.
- Classes D and E: Average performance with room for improvement.
- Classes F and G: Usually uninsulated buildings or those with outdated systems and high energy demand.
Checking the energy class when buying or renting a home is a practical way to anticipate future heating and cooling needs.
External Wall Insulation: The Foundation of Thermal Comfort
One of the most important factors in a building's energy performance is its outer envelope. External wall insulation (often called an ETICS or "thermal jacket" system) involves fixing insulation boards to the outside of the walls and finishing them with mesh-reinforced render and a top coat. The building is effectively wrapped in a warm coat.
Properly applied, it reduces thermal bridges at columns, beams and slab edges, lowers the risk of condensation and mould on interior surfaces and keeps indoor temperatures more stable. The type and thickness of insulation should be decided at the design stage according to the local climate, building type and fire safety requirements. Common mistakes on site include gaps between boards, insufficient anchors or adhesive and careless detailing around windows, which is why workmanship matters as much as materials.
Choosing Windows and Frames
However well the walls are insulated, weak windows will keep losing heat. For energy-efficient glazing, pay attention to the following:
- Double or triple glazing: The cavity between panes and a suitable gas fill reduce heat transfer.
- Coated glass: Low-emissivity (low-e) coatings keep heat inside in winter, while solar control coatings limit overheating in summer.
- Insulated profiles: Choose multi-chamber PVC or aluminium profiles with a thermal break.
- Correct installation: The joint between frame and wall must be sealed against air and water with insulating tapes.
Other Elements of a Comfortable, Efficient Home
Energy efficiency is not only about walls and windows. Roof and ground floor insulation, efficient heating and hot water systems, thermostatic valves, suitable ventilation and LED lighting are all part of the whole. Passive design measures such as building orientation, sun shading and roof overhangs also help keep interiors cool in summer.
When these elements come together, the result is less heating demand in winter, cooler rooms in summer, a quieter interior and a lower environmental impact. An energy-efficient building is also seen as an investment that better retains its value over time. For solutions tailored to your project, we recommend seeking advice from mechanical and civil engineers and energy experts.
Frequently Asked Questions
Who prepares the energy performance certificate?
The certificate is prepared through the official system by authorised energy certificate experts or licensed companies. Its validity can be verified through official records.
Can an existing building's energy class be improved?
Yes. After measures such as external insulation, window replacement, roof insulation and heating system upgrades, a new assessment can raise the class. Which steps should come first must be decided building by building.
How can I find out the cost of insulation work?
The cost depends on the size of the building, the materials chosen and the scope of work. The most reliable way is to request a quote after an on-site assessment.
At Kırkhanlı İnşaat, we treat energy efficiency as a natural part of design in residential, commercial and industrial projects, from planning to turnkey delivery. To learn more about insulation and energy-efficient buildings or to request a quote, you can reach us through our Contact page.