E4 House

  • by Sergiu Petrea
  • /
  • 2016-06-28 13:46:45
  • /
  • International
  • /
  • 11382 / EN
  • Building Type : Isolated or semi-detached house
  • Construction Year : 2015
  • Delivery year : 2015
  • Address 1 - street : 077066 OSTRARU, Romania
  • Climate zone : [Dfb] Humid Continental Mild Summer, Wet All Year

  • Net Floor Area : 350 m2
  • Construction/refurbishment cost : 216 000 €
  • Cost/m2 : 617.14 €/m2

Proposed by :

Certifications :

  • Primary energy need :
    36 kWhpe/m2.year
    (Calculation method : Other )
Energy consumption
Economical buildingBuilding
< 50A
51 à 90B
91 à 150C
151 à 230D
231 à 330E
331 à 450F
> 450G
Energy-intensive building

The challenge of designing an E4 House, coming up with personalised ideas and design to enhance the 4 main concepts: Energy efficiency, Environment, Emotion &health, Economy.

Energy efficiency refers to the minimization of energy consumption through design, seeking ways to use innovative heating and edge building technologies in order to become a referenced NZEB. Environment. Reduction of greenhouse gas emissions by the use of environmentally friendly renewable energy sources such as sun, geothermal heat or biomass. Emotion & health. The house seeks to achieve that unique quality of living and explores ways to ensure a healthy room climate using as much as possible the natural building material of clay products. Economy. Last but not least, we obtained an affordable house and maintenance costs in order to prove that it is possible to have an attractive and affordable NZEB.

The E4 House concept follows the subsequent development of the major energy efficient building design methods but at the same time pays attention to the cultural background and the regional adaptation of the layout to each context. In architectural terms, the main elements that are crucial to the building’s energy-efficiency are also the most powerful visual characteristics - in particular the components of the buildings envelope. And these elements are also the main factors that bear the marks of tradition and culture, represented by the urban rules and the site context. Based on this, the project focused on the contemporary approach of the pitched roof - covered with ceramic tiles, of the massive brick walls and terraces - possible to have ceramic finishes, of the windows typology and the balance of textures and colours, both for exterior and interior.

See more details about this project



Contracting method

Other methods


Energy consumption

  • 36,00 kWhpe/m2.year
  • 126,00 kWhpe/m2.year
  • Other

Envelope performance

  • 0,22 W.m-2.K-1
  • Exterior insulation to ambient air - 0.22W/(m²K)
    Exterior insulation underground - 0.18W/(m²K)
    Windows and external doors - 0.94W/(m²K)

  • 0,20
  • n50


    • Heat pump
    • Low temperature floor heating
    • Heat pump
    • Solar Thermal
    • Reversible heat pump
    • Others
    • Natural ventilation
    • Solar photovoltaic
    • Solar Thermal
    • Heat pump

    A major innovative energy system considered in the proposed E4-house design consists in an optimized Trombe wall, known to provide heat by a combination of thermal mass and greenhouse effects. In the original Trombe wall solution, the southern wall of the building – usually made of materials with heat storage properties (thermal mass: bricks, concrete, stones) – is painted in dark colors and has a glass panel placed in front of its surface, at a certain distance to create an air cavity. By greenhouse effect, the wall is heated by convection from the warm upward airflow that is generated through the gap. The present design attempts to optimize the Trombe wall by combining its effects with ventilation. The Trombe wall is placed on the Southern surface of the living room, where the overnight temperature may be lower than the temperature needed for comfort during the day.

Smart Building

    -Centralized automation systems SPS System (BMF) free programming, from Hanazeder. The central home automation technology enables homeowners to control heat, window coverings, lighting, security sensors and cameras, as well as to track comfort parameters


    Porotherm Clay Blocks


    [email protected]

    Porotherm is a precision clay block walling system - a modern method of construction with reassuringly traditional values.

    Both designers and workers.

Biodiversity approach

    The house is located near the city, in a low density residentioal area that provides the best environment for the construction of a nearly zero energy building.

  • 944,00 m2
  • 37,00 %
  • 524,00

Reasons for participating in the competition(s)

Building candidate in the category

Energy & Temperate Climates

Energy & Temperate Climates

Users' Choice Award

Users' Choice Award

Green Building Solutions Awards 2016

Author of the page

  • Sergiu Petrea

    Managing Partner, Architect


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    Green Building Solutions Awards 2016