Buying real estate in Vienna and Austria is not just about choosing an apartment with a beautiful view and convenient location. Today, a building’s energy efficiency has become one of the key factors affecting living comfort, utility costs, and resale value. In this article, we’ll explain what you need to know about housing energy efficiency in Austria to make the right choice.
What is an Energy Performance Certificate (Energieausweis)
An energy performance certificate is a mandatory document in Austria that contains information about a building’s energy efficiency. Since December 2012, according to the Energieausweis-Vorlage-Gesetz (EAVG 2012), owners are required to provide this certificate when selling or renting out property.
What the energy performance certificate contains:
- Energy efficiency class (from A++ to G)
- Heating energy requirement indicator (Heizwärmebedarf, HWB)
- Overall building energy efficiency (fGEE)
- Information about heating, cooling, and ventilation systems
- Recommendations for improving energy efficiency
The certificate is valid for 10 years and must be issued by a certified energy auditor. All energy performance certificates are registered in the Statistics Austria state database. Absence of a certificate when selling property can result in fines up to €10,000.
Energy Efficiency Classes: What the Letters Mean
Energy efficiency of buildings in Austria is assessed on a scale from A++ (best) to G (worst), similar to household appliance labeling.
A++ and A+ are passive houses (Passivhaus) with minimal energy consumption. Heating requirement is less than 15 kWh/m² per year. Such houses practically don’t require traditional heating thanks to quality insulation, triple-glazed windows, and heat recovery systems.
B and C are buildings with high energy efficiency. These are modern new constructions meeting minimum standards for new buildings in Austria. Heating requirement is 25-50 kWh/m² per year.
D and E are standard buildings with average energy efficiency. This category often includes buildings constructed between 1980-2000 that have undergone partial modernization.
F and G are buildings with low energy efficiency. These are predominantly historical Altbau buildings without renovation or with minimal thermal insulation. Heating requirement can exceed 150 kWh/m² per year.
Practical Example: What the Numbers Mean for Your Wallet
Let’s consider a 70 m² apartment in Vienna. At a heating price of approximately €0.10 per kWh, the difference in costs between different energy efficiency classes will be substantial:
Class A+ apartment (Passivhaus):
- Heating requirement: 10 kWh/m²/year
- Total requirement: 700 kWh/year
- Annual costs: approximately €70
Class C apartment:
- Heating requirement: 50 kWh/m²/year
- Total requirement: 3,500 kWh/year
- Annual costs: approximately €350
Class F apartment (Altbau without renovation):
- Heating requirement: 150 kWh/m²/year
- Total requirement: 10,500 kWh/year
- Annual costs: approximately €1,050
The difference between a passive house and an old building without renovation is almost €1,000 per year! Over 10 years, that’s €10,000 in savings, which can offset the higher purchase price of energy-efficient property.
Passivhaus Standard: The Gold Standard of Energy Efficiency
Austria is a pioneer of the Passivhaus (passive house) concept. Interesting fact: every fourth passive house in the world is located in Austria. As of 2024, more than 14,000 buildings to Passivhaus standard have been constructed in the country.
Key Passivhaus requirements according to OIB-Richtlinie 6:
- Heating requirement no more than 15 kWh/m²/year
- Total energy consumption (including household) up to 120 kWh/m²/year
- Building airtightness: n50 indicator no more than 0.6 h⁻¹
- Ventilation with heat recovery of at least 75% efficiency
- Windows with heat transfer coefficient Uw ≤ 0.8 W/m²K
Advantages of living in a Passivhaus:
Regardless of external temperature, internal temperature remains comfortable (20-25°C) without active heating. Thanks to controlled ventilation, rooms always have fresh air without needing to open windows, which is especially important for allergy sufferers.
Heating savings amount to up to 90% compared to standard buildings. Owners save approximately €825 per year on fuel and €65 on electricity. Over 20 years, that’s more than €17,000 in net savings.
Subsidies and Financial Support
The Austrian government actively supports energy-efficient construction and renovation through various subsidy programs.
Federal programs:
The heating system replacement program (Sanierungsoffensive) provides subsidies of up to 75% of the cost of replacing fossil fuel-based heating (oil, gas) with renewable sources (heat pumps, pellet boilers, solar collectors).
For new Passivhaus-class housing construction, preferential loans at reduced interest rates are available. Interest savings in the first years amount to approximately €880 per year.
Regional programs:
Each of Austria’s nine federal states has its own additional programs. For example, in Vienna, thermal modernization subsidies can cover up to 35% of building thermal modernization costs (maximum €12,000), including window replacement, facade insulation, and roof work.
The federal state of Vorarlberg is particularly progressive: since 2007, all new public buildings in most municipalities have been built to Passivhaus standard. Detailed information about standards and certification can be found on the Passivhaus Austria website.
What to Pay Attention to When Buying
If you’re buying a new apartment, request the energy performance certificate at the viewing stage. Developers are required to provide this document, and sales advertisements must indicate the energy efficiency class.
When buying an old apartment (Altbau), it’s especially important to check the energy performance certificate. If the building has class F or G, budget for future modernization or be prepared for high heating costs.
Pay attention to the heating type. If the building has oil or gas heating, note that from 2025, Austria has banned the installation of new oil heating systems in new buildings. Gas systems are also being gradually phased out.
Check whether building thermal modernization has been carried out. If an Altbau building has new energy-efficient windows installed, insulated facade, and modernized heating system, actual energy consumption may be significantly lower than indicated in an old certificate.
Future EU Requirements
The European Union is constantly tightening energy efficiency requirements for buildings according to the Energy Performance of Buildings Directive (EPBD). From 2030, all new buildings must be nearly zero energy consumption (Nearly Zero Energy Buildings, NZEB). This means standards similar to Passivhaus will become mandatory.
Phased energy efficiency requirements are also being introduced for existing buildings. Buildings with the worst indicators (classes F and G) will gradually have to undergo mandatory modernization. This may affect property values: buildings with poor energy efficiency may lose value, while energy-efficient properties will become even more attractive.
Renewable Energy and Photovoltaics
From 2025, photovoltaic systems are becoming practically mandatory for new buildings in Austria. Solar panels on roofs not only reduce electricity costs but can also generate income through selling excess electricity to the grid.
Austria offers subsidies for installing solar panels and energy storage systems (batteries) according to the Renewable Energy Expansion Act (Erneuerbaren-Ausbau-Gesetz). For residential buildings, subsidies can amount to up to €200 per kWp of installed capacity for photovoltaics and up to €200 per kWh of capacity for storage systems.
Many new residential complexes in Vienna are creating energy cooperatives (Energiegemeinschaften) where residents jointly produce and consume electricity. This reduces costs and decreases dependence on external energy suppliers.
Thermal Modernization: When It Makes Sense
If you already own property with low energy efficiency, thermal modernization can be a worthwhile investment.
Main thermal modernization measures:
Facade insulation costs approximately €80-150 per m² but can reduce heat loss by 25-40%. Payback period: 15-20 years with subsidies considered.
Replacing old windows with triple-glazed energy-efficient ones costs €400-800 per window. Payback period: 10-15 years. Bonus: substantial soundproofing improvement.
Replacing an old oil boiler with a heat pump costs €15,000-25,000, but with a 75% subsidy, you only pay €4,000-6,000. Payback period: 5-8 years.
Installing ventilation with heat recovery costs €8,000-15,000 and can save up to 30% on heating costs. Payback period: 12-18 years.
Conclusion
Energy efficiency of property in Austria is not just a fashionable trend but an important economic and environmental factor. When buying housing, always request an energy performance certificate and analyze the energy efficiency class.
The difference in costs between energy-efficient and inefficient property can amount to thousands of euros per year. Investment in a class A or B apartment will pay off not only through utility bill savings but also through higher resale value.
Austria offers some of Europe’s best subsidy programs for energy-efficient construction and renovation. Take advantage of this support to make your housing comfortable, economical, and environmentally friendly.
Remember: energy-efficient property is an investment in your future. Lower utility costs, higher living comfort, and better ecology make such properties increasingly valuable in the Austrian real estate market.
