The energy performance of the building at Allveelaeva 4 corresponds to Class B.

The building is based on a pile foundation. The load-bearing structures of the parking area are the exterior walls of cast-in-place reinforced concrete, interior walls of reinforced concrete elements and pillars of cast-in-place reinforced concrete that support a cast-in-place reinforced concrete floor. From Floor 2 upwards, the vertical load-bearing structures are constituted by walls composed of prefabricated reinforced concrete elements. Insulation layers have been installed and a levelling layer of cast concrete has been added to the ceiling slabs to attenuate footstep noise. The building has a flat built-up roof. The façades are mainly covered with plaster in three different tones, seconded by facing bricks to add detail and provide a three-dimensional fabric.

The load-bearing walls between the apartments are made of prefabricated reinforced concrete slabs. The non-load-bearing walls and internal walls between apartments and the stairhall are composed of concrete blocks. The walls and shafts of the bathrooms are made of lightweight blocks. The internal walls of the apartments are composed of plasterboard on metal framing, insulated with mineral wool. The plasterboard walls have been reinforced with oriented strand board (OSB) in the kitchen furniture and TV mounting zones. The internal stair flights and landings are made of prefabricated reinforced concrete elements. Each stairhall has a lift. The walls of the stairhall and lift halls are painted; the ceilings are suspended.

The internal stair flights and landings are made of prefabricated reinforced concrete elements. The walls of the stairhall and lift halls are painted; the ceilings are suspended. Each building has a lift. There is a common room on Floor 1 for storing bicycles and prams.

The balconies are made of prefabricated reinforced concrete slabs, and the floors of terraces and balconies are covered with wooden boarding. The balconies have glass railings and the balconettes have metal railings.

The commercial spaces on Floor 1 have a glass façade. From Floor 2 upwards, the windows are triple-glazed with timber/aluminium frames. The main doors of the apartment buildings are composed of aluminium profiles and glazed. The external doors of the apartments are covered with oak veneer.

The building is connected to the district heating network of Utilitas Tallinn. The commercial spaces have radiator heating; the apartments have comfortable and energy-efficient underfloor heating. The manifold cabinets have been installed in the niche of the entrance area or in the domestic storage room. The apartments have an autonomous ventilation system based on heat recovery. The ventilation devices are located in the domestic storage room, wardrobe or above the suspended ceiling in the bathroom. Heat recovery will contribute to saving energy, and filtered ventilation will reduce the amount of dust particles in the rooms. Separate extraction ducts have been installed for kitchen hoods in each apartment.

The client can request an option to have a cooling system built into the (three-room) corner apartments and into (the living room and master bedroom of) all apartments on the uppermost floor. The commercial spaces will have local cooling built in.

The building is connected to the municipal water supply and sewerage system of Tallinn. Domestic hot water is supplied from the heating system of the building. Water meter readings are taken remotely: the reading is registered automatically and recorded in the administrator’s database.

The remotely readable electricity meters are located in the distribution cabinets of the respective floors. The electricity and low-current distribution boards of the apartments are recessed in the wall of the entrance area wardrobe. The normal-current section of the distribution board contains automatic circuit-breakers and the low-current section contains an option for surveillance, connections for TV and communications and a free connection for an active networking device (router). Sockets and switches have been installed in the apartments; lighting fixtures have been installed in the sanitary rooms and entrance areas. The rooms have a modular wall socket for network connection.

All apartments contain a smart home solution, which can be used to control the indoor climate of the apartment and the video door phone and to monitor the technical systems of the apartment both on the screen in the apartment as well as on the Internet via a smart device. The indoor climate control includes heating and ventilation, and cooling, if available. The ventilation can be controlled by an intra-apartment CO2 sensor or a manually selected mode. In addition, the smart home solutions allow the monitoring of electricity readings and hot and cold water readings.