NZEB Housing for Young People

Context and Strategic Framework

The affordable housing crisis for young people represents one of the most acute social challenges facing Bucharest Municipality. Sector 5, with a population exceeding 280,000 inhabitants, confronts a housing demand that significantly surpasses the available supply, particularly within the financially accessible segment for young people aged between 18 and 35.

The NZEB (Nearly Zero-Energy Buildings) housing project was initiated as a response to this challenge, proposing a residential complex that combines financial accessibility with peak energy performance. Design documentation was prepared in compliance with the European Directive on the Energy Performance of Buildings (EPBD) and national thermal design standards.

The total investment value amounts to 120 million RON, encompassing construction, technical installations, and exterior landscaping across a total area of 22,000 sqm.

Architectural Approach

The residential complex comprises 4 apartment blocks with a height regime of Ground + 4 Floors, totalling 180 apartments with areas ranging from 45 sqm (studios) to 85 sqm (3-bedroom apartments). Building orientation was optimised to maximise passive solar gain, with the principal facades oriented south-south-east.

The monolithic reinforced concrete structural system was designed in accordance with seismic code P100, with a performance level corresponding to importance class II. The high-performance thermal envelope, with thermal transfer coefficients U below 0.15 W/sqmK for walls and 0.10 W/sqmK for roofing, ensures the minimisation of energy losses.

Common spaces include multipurpose rooms on the ground floor of each block, bicycle storage facilities, technical rooms for ventilation equipment, and electric vehicle charging stations in the underground car park.

Energy Component and Building Services

The complex's energy system is based on the principle of partial self-sufficiency, combining multiple renewable energy sources. Photovoltaic panels installed on building roofs, with a total installed capacity of 320 kWp, cover approximately 60% of the electricity consumption for common areas and technical systems.

The geothermal heat pump, with a capacity of 450 kW, provides space heating and cooling through a heat recovery ventilation system operating at 90% efficiency. Domestic hot water preparation is ensured by solar thermal collectors integrated into the south-facing facades.

The building management system (BMS) monitors and optimises the energy consumption of the entire complex in real time, transmitting data to the operator's monitoring platform.

Outcomes and Social Impact

The NZEB housing complex for young people constitutes a national pilot project, demonstrating the feasibility of constructing social housing with exceptional energy performance. The buildings' primary energy consumption, at approximately 25 kWh/sqm/year, sits significantly below the national NZEB threshold of 100 kWh/sqm/year established by legislation.

Operating and maintenance costs are approximately 70% lower compared to conventional buildings in the area, directly reflected in the reduced maintenance charges borne by residents. The project received a best practice distinction from the Association of Romanian Municipalities and serves as a reference model for future social housing programmes.