Office building in Sfantu Gheorghe (Covasna)
nZEB Example

This building is the first office building certified at passive house standard in Romania with a total area of 700 m² and 50 workplaces.
The main challenge in the project was the location of the building in the city centre of Sfântu Gheorghe, in one of the coldest regions of the country and hidden in the narrow urban structure with many shading elements all around and with limited available floor space as the building occupies practically the entire land area.

Building owner

Gnome Design SRL

Building type
Project type
Year of construction / major renovation

Construction: 2021
Major renovation: N/A

Total floor area
526 m²
Construction U-value

Outer walls

0.153 W/m²K


0.115 W/m²K

Basement ceiling / floor slab

0.205 W/m²K
Windows Uw Uf Ug G

Window frames: Schüco, FWS 50SI - AWS 90 SI+

0.88 W/m²K N/A 0.55 W/m²K 44 %
Doors U-value

Entrance doors

0.83 W/m²K
Building Services

Thermal heating load (PHPP) 7.5 kW
Thermal cooling load (PHPP) 4 kW
Gas boiler 35 kW, Chiller 34 kW Fan coil units
DHW tank 300 l, DHW recirculation pipe
Ventilation: Duplex, MultiEco 3500

The building's energy efficiency has been improved by installing 54.8 square metres of photovoltaic panels.

nZEB Parameters

Primary energy consumption: 53.8 kWh/m²yr
Building tightness: 0.34 ach @ 50 Pa
CO2 emissions: 5.46 kgCO2e/yr
Renewable share of energy: 30.1%

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