If you’re considering purchasing a premium apartment in 2026, you’re probably looking at more than just the floor plan, finishes, or location. You want true comfort, predictable costs, and an investment that retains its value over time. For high-income families, professionals in management, medicine, or IT, and active investors, a building’s technical performance has become a selection criterion just as important as its location.
This checklist helps you thoroughly verify construction and energy efficiency standards before signing a contract. You can use it at any property viewing, whether you’re evaluating premium apartments in Sector 1—Băneasa/Sisești—or considering a move to the Bucharest–Ilfov area. Save the list and use it every time! The differences between a well-executed project and a slapdash one are evident in the technical details, not in the renderings.
1. Verify compliance with the nZEB standard and readiness for ZEB
By 2026, all new residential buildings must comply with the nZEB (Nearly Zero Energy Building) standard. This means very low energy consumption and the use of a significant proportion of renewable energy sources.
Specifically, it aims to:
- documentation certifying compliance with nZEB;
- if the project anticipates the ZEB (Zero Emission Buildings) requirements that will take effect in the coming years;
- the percentage of energy consumption covered by renewable sources (solar panels, heat pumps).
A long-term project like Green Lake by Primavera Development incorporates these solutions right from the design phase. You can learn more about the vision and concept on the page dedicated to the Green Lake project.
A well-built nZEB apartment means lower utility bills, consistent thermal comfort, and protection against changes in legislation.
2. Read the energy performance certificate carefully
Don’t just focus on the “Class A” rating. Open the energy certificate and check the technical specifications:
- Energy efficiency class – A or B for high-performance new buildings.
- PE (primary energy) expressed in kWh/m²/year—the lower the value, the more energy-efficient the building is.
- CO₂ emissions (kg/m²/year) – for energy-efficient buildings, these values are low, generally below 20 kg/m²/year.
- the share of renewable energy in total energy consumption.
In most cases, the difference between Class A and Class C can amount to a few hundred lei per year for a 3–4-room apartment. Over the long term, this difference becomes significant.
If the developer does not provide you with the certificate before signing, ask for it explicitly. It is a document required by law.
Take a closer look at the building envelope: insulation makes all the difference
A building’s envelope includes the exterior walls, roof, floors, and windows and doors. It controls heat loss and directly affects indoor comfort.
Check:
- the thickness and type of insulation (for example, 15 cm of basalt mineral wool or high-density graphite-modified polystyrene);
- the U-value for walls—values below 0.25 W/m²K indicate effective insulation;
- Proper insulation of the roof and the floors above the basement.
Basalt mineral wool offers fire resistance, better sound insulation, and long-term stability. Graphite-modified polystyrene has low thermal conductivity but requires proper installation to prevent degradation.
For consistent results, we recommend consulting an architect or a structural engineer who can interpret the technical data in the project.
4. Check the windows and glass
Windows are one of the main sources of heat loss in poorly designed buildings. Watch:
- triple-pane window (three panes of glass);
- Uw coefficient less than 1.1 W/m²K;
- thermal break profiles;
- Proper installation, with no gaps or leaks.
Triple-pane windows reduce heat loss and outside noise. For families with children or professionals who work partly from home, sound insulation is a real advantage.
Primavera Development, the developer behind the project, has solid experience in construction and approaches projects from a technical perspective, not just a commercial one.
5. Request information about the airtightness test (Blower Door)
A modern building must be airtight. The Blower Door test measures air infiltration through gaps or joints.
Specifically, ask:
- whether the building inspection has been conducted;
- What values were obtained, and how do they relate to the nZEB requirements?
Good airtightness prevents condensation, mold, and energy loss. However, without controlled ventilation, a building that is too airtight can cause discomfort. That is why systems must be designed as an integrated whole.
6. Evaluate the heating system: heat pump or gas?
By 2026, heat pumps will become a common solution in high-end projects.
Check:
- pump type (air-to-water, ground-to-water);
- installed power relative to the apartment’s floor area;
- Integration with underfloor heating.
A heat pump uses electricity and transfers heat from the air or the ground into the building. For typical use, energy consumption is lower than with conventional gas-fired boilers, and emissions are lower.
Ask the developer how they handle maintenance and what warranties they offer for the equipment.
7. Check to see if the floor heating is working
Underfloor heating operates at lower temperatures than traditional radiators. It distributes heat evenly and increases comfort. Watch:
- whether the system is properly sized for each room;
- the type of pipes and manifolds;
- Individual automation by zone.
At Green Lake, you can follow the construction phases and the technical solutions implemented in the section dedicated to the progress of the work.
For families looking for 3- and 4-room apartments or villas in Sector 1—Băneasa/Sisești—this system contributes to daily comfort and a clean, minimalist interior design.
8. Confirm the presence of mechanical ventilation with heat recovery
Mechanical ventilation with heat recovery (MVHR) brings in filtered fresh air and recovers up to 80–90% of the heat from the exhaust air. Check:
- whether the system is centralized or individual;
- the heat recovery level specified by the manufacturer;
- the type of filters used and how often they are replaced.
For families with children or people who are sensitive to allergens, indoor air quality matters. Properly sized systems reduce humidity and prevent mold growth.
9. Analyze the integration of photovoltaic panels
Photovoltaic panels installed on the building can power common areas: elevators, lighting, and technical systems. Ask:
- whether the panels are already installed or whether the project is ready for them;
- What percentage of total consumption is covered;
- estimates regarding reductions in maintenance costs.
At Green Lake, the installation of solar panels is part of the complex’s energy efficiency strategy. You can read technical details about the installation of solar panels on the Green Lake blog.
For investors, these solutions increase the property’s appeal to renters and help maintain its value over time.
10. Estimate the actual maintenance costs
Don’t just focus on the purchase price. Consider the monthly costs:
- requests estimates for heating, cooling, and common areas;
- compare it to a similar apartment in an older building;
- Calculate the savings over 10 years.
For an apartment of approximately 90 square meters, the annual difference between an energy-efficient building and an average one can amount to several thousand lei. For an investor, this difference affects the return on investment.
11. Check the developer’s experience
A premium project starts with a reliable developer. Watch:
- history of completed projects;
- the team’s technical expertise;
- quality of workmanship and adherence to deadlines.
Green Lake by Primavera Development benefits from the expertise of a developer with a background in construction, which means direct oversight of the construction process and attention to technical details. If you’re considering housing options in a gated community, check out the available Green Lake apartments!
Use the checklist every time you watch a movie
Don’t treat these points as mere theoretical information. Take the list with you to the viewing. Ask questions. Request documents. Compare the projects with one another.
Energy standards affect:
- your family’s everyday comfort,
- long-term costs,
- resale value,
- appeal to tenants, if you invest.
If you’re looking for premium villas or apartments in Sector 1—Băneasa/Sisești—in a well-managed private community, schedule a tour of Green Lake by Primavera Development! See the technical solutions in place, talk to the team, and examine the differences in detail. Use the checklist to make an informed decision!
Frequently Asked Questions (FAQ)
What is the actual difference between an nZEB apartment and one built before 2015?
An nZEB apartment has thicker insulation, high-performance windows, modern heating systems, and a share of renewable energy. For typical use, utility bills are lower, and indoor temperature comfort is more stable. Older buildings often require costly retrofits to achieve a similar level of performance.
Is it worth investing in a premium apartment with energy-efficient technology?
For families and investors, yes, in most cases. The initial costs may be higher, but the monthly savings, comfort, and resale value justify the investment in the long run. Analyze the actual figures and compare scenarios over a period of at least 10 years.
Can I independently verify the apartment’s energy performance?
Yes. You can request the technical documentation and consult an energy auditor or a mechanical engineer for a further assessment. For major investments, a specialist’s opinion provides clarity and reduces the risk of making the wrong decisions.