The Greek real estate market is undergoing a fundamental transformation. While just ten years ago buyers were solely interested in location and sea views, a critically important variable has been added to the selection equation today: energy efficiency. Against the backdrop of rising energy prices in Europe and increasing environmental standards, Athens’ old housing stock is rapidly losing its appeal compared to modern buildings.
Energy Class A+ in new Greek housing developments is no longer just a marketing slogan for developers. Today, it is a mathematically justified necessity that directly affects the quality of life and the size of monthly bills. In this article, we will take a detailed look at what lies behind this marking, what technologies ensure this status, and why, by overpaying at the start, you save tens of thousands of euros in the future.
What is Energy Efficiency in Greek: Understanding the Certificates (PEA)
To understand the value of Class A+, you need to understand the rating system. Greece operates the Regulation on the Energy Performance of Buildings (KENAK). Each property is assigned a certificate (PEA — Pistopoiitiko Energeiakis Apodosis), ranking buildings on a scale from G (the lowest level) to A+ (the highest level).
The market situation is such that the vast majority of buildings constructed before 2010 fall into categories D through G. The famous Athenian “polykatoikias” (apartment buildings) built in the 1970s–1980s often lack any thermal insulation. This means that in winter, such houses instantly cool down, requiring colossal costs for heating (with oil or gas), and in summer, they turn into scorching furnaces, forcing air conditioners to work excessively.
Class A+ is assigned to buildings whose primary energy consumption is less than 33% of the consumption of a reference building. In simple terms: an A+ class house consumes 3–4 times less energy than a standard 90s building. This is achieved not just by wall thickness, but by a complex of engineering solutions laid out at the design stage.
Anatomy of an A+ Class Home: The Technologies Behind the Letter
An A+ class building is a complex engineering organism. Let’s analyze the “filling” of a modern Greek new build that ensures this status.
1. Thermal Facade and Insulation
The foundation of energy efficiency is the building’s “thermal envelope.” New buildings use thermal facade technology (in Greek, “kelyfos” – shell). External walls, concrete columns, and beams are covered with a layer of insulation (usually expanded polystyrene or rock wool 8–10 cm thick) and special plaster.
This solves the main problem of old houses — thermal bridges. In old buildings, concrete slabs freeze and transfer cold indoors. In A+ houses, the concrete is reliably wrapped, eliminating heat loss.
2. Heat Pumps and Fan Coils
The era of oil boilers and even gas heating is fading. Individual heat pumps have become the standard for Class A+.
- Principle of operation: The pump extracts energy from the surrounding air and converts it into heat for water heating or space heating. The efficiency of such systems reaches 300–400% (for 1 kW of consumed electricity, you get 3–4 kW of heat).
- Cooling: The same pumps work for cooling in the summer, replacing traditional split systems. Concealed ducted fan coils are often used, which do not spoil the interior.
3. Solar Panels and Water Heaters
Greece is a country of sun, and Class A+ implies its active use.
- Solar water heaters: A mandatory element. Hot water is heated for free 8-9 months of the year.
- Photovoltaics (PV): Many modern complexes are equipped with solar panels for common area needs (elevator, stairwell lighting) or individual Net Metering systems, allowing residents to “sell” surplus energy back to the grid, zeroing out electricity bills.
4. Aluminum Profiles and Thermal Break
Windows are the main pathway for heat leakage (up to 30%). New buildings install aluminum profiles with a thermal break (a polyamide insert that interrupts the flow of cold through the metal) and double-glazed units with low-emissivity (Low-E) coating and argon gas inside.
The Economics of the Matter: Real Savings Figures
Many investors ask themselves: is it worth overpaying for a new building if the secondary market is cheaper? If you plan to buy an apartment in Athens not for speculative resale but for living or long-term rental, the answer is unequivocally yes.
Let’s compare the annual operating costs for a 100 sq.m. apartment in Athens.
Comparison of Maintenance Costs (100 sq.m.)
| Expense Item | Old Stock (Class F/G, 1980) | New Build (Class A+, 2024) | Annual Savings |
| Heating (Winter) | 1,200 € – 1,500 € (Oil/Gas) | 250 € – 350 € (Heat Pump) | ~1,000 € |
| Cooling (Summer) | 600 € – 800 € (Old Air Conditioners) | 150 € – 200 € (High-Efficiency Systems) | ~500 € |
| Hot Water | 300 € – 400 € (Electric Boiler) | 50 € – 80 € (Solar Collector) | ~300 € |
| Maintenance (Koinochrista) | High (repair of old pipes, boiler) | Low (new utilities, LED) | ~200 € |
| TOTAL per year | ~2,500 € | ~500 € | ~2,000 € |
Note: Calculations are approximate and depend on tariffs and intensity of use, but the proportion remains.
Over 10 years of owning an A+ class apartment, you will save about 20,000 euros just on utility bills. We are not factoring in the inflation of energy prices, which makes this gap even more significant.
Non-Obvious Advantages: Comfort and Health
Savings are an important, but not the only argument. Life in an A+ energy class house differs qualitatively in terms of comfort.
- Victory over Dampness. The main scourge of Greek housing is high humidity in winter, leading to the appearance of black mold on walls and ceilings. In A+ houses, thanks to airtightness, proper ventilation, and the absence of cold walls (the dew point is moved outward thanks to the thermal facade), this problem is eliminated. This is critically important for families with children and allergy sufferers.
- The “Thermos Effect.” In such a house, the temperature is distributed evenly. There are no zones where “a draft comes from the window” or “cold creeps from the floor.” The building heats up slowly in summer and cools down slowly in winter.
- Acoustic Comfort. Heavy energy-saving double-glazed windows and dense wall insulation also work as excellent sound insulation. The noise of busy Athenian streets stays outside.
Asset Liquidity: The Investor’s Perspective
Acquiring real estate is always a look into the future. The European Union has set a course for the “Green Deal.” Energy efficiency requirements are tightened annually.
Even now, when selling or renting an apartment in Greece, the presence of a PEA certificate is mandatory. In the near future, properties with a low energy class will be subject to additional taxes or restrictions (for example, a ban on renting without modernization, as is already being discussed in a number of EU countries).
By buying an apartment in a 1970s building, you are acquiring an asset that is morally and technically obsolete. Its renovation to A level is practically impossible or economically impractical (you cannot change the structure, it is difficult to agree with neighbors on the facade).
In contrast, buying an A+ class apartment in Athens means investing in an asset whose liquidity will only grow as the market shifts towards sustainable development. This is a “future-proof” investment — protected from future regulations.
FAQ (Frequently Asked Questions)
1. How much more expensive is a new A+ build compared to a secondary market class B or C property when buying?
On average, the price difference per square meter between quality secondary housing (15–20 years old) and a new A+ build is 25–40%. However, this gap narrows when considering the need for major repairs in secondary housing (replacement of windows, pipes, wiring), which will not be required in a new build for the next 15–20 years.
2. Is it possible to upgrade an old apartment in the center of Athens to class A+ with renovation?
Technically — extremely difficult, practically — almost impossible for an individual apartment. To get an A+ class, you need to insulate the entire facade of the building, change the entire house’s heating system, and install solar panels on the roof. In an apartment building (polykatoikia), this requires the consent of 100% of residents and huge investments. The maximum that is usually achieved with individual renovation is class B.
3. Are there tax incentives for owners of energy-efficient housing?
Greek legislation is dynamic. Currently, there are subsidy programs (such as “Exoikonomo”) for the renovation of old housing. For buyers of new A+ builds, the main bonus is a high appraisal value for the bank (easier to get a mortgage) and, in some cases, reduced municipal taxes, although this practice depends on the specific municipality.
Conclusion
Energy Class A+ in new Greek housing developments is not just a letter on a certificate. It is a guarantee that your home is built using advanced technologies that will be relevant even in 20 years. It is the health of your family, freedom from dampness and drafts. And, of course, it is your financial security in the face of rising energy prices.
When choosing real estate in Athens today, look not only at the view from the window but also at the engineering passport of the property. Savings begin not at the moment of paying bills, but at the moment of making the right purchase decision.
