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Energy efficiency in new construction

Good energy efficiency is always in the best interests of the building owner and users. High-quality construction cuts down the energy bill, facilitates the use of the building and guarantees that the building retains its value. The quality of construction can be assessed in the construction phase, for example, with thermal imaging and air-tightness measurements.

Energy efficiency in buildings can be achieved in many different ways. Building energy efficiency solutions affect the design of spaces and operations, so an energy efficiency expert should be included in the project in an early design phase.

Solar energy and natural light can be utilized by orienting and opening the building towards the sun. Machine cooling can be avoided by careful design of interiors so that they are not exposed to direct sunlight. The heating of indoor air can be prevented with eaves, extensions, awnings and special glass in windows. Deciduous trees can be used to shade a building façade in summer. Semi-heated spaces, such as green rooms, porches and glass balconies, help to reduce heating needs.

Energy-efficiency survey

An energy-efficiency survey is conducted on new buildings in the design and permitting phase in accordance with building regulations. The energy efficiency of a building is assessed with an E-factor, which reflects both energy consumption and the type of energy source. The goal is to increase the utilization of renewable energy. Energy produced in the building or in the vicinity of the building reduces the need for purchased energy affecting the E-factor.

The E-factor of a new building is improved by:

  • successful orientation of the building and a non-complicated building shape,
  • a heating system based on hot water circulation utilizing renewable energy or district heat,
  • good thermal insulation and air-tightness of the building envelope,
  • solutions that save hot domestic water, and
  • an efficient, low-energy ventilation system.
According to building regulations that took effect in 2018, the E-factor of a new residential building must not exceed the following values (kWhE/net-m²/a):
  • multi-story apartment building with at least 3 residential floors 90
  • row house and multi-story apartment building with 2 residential floors at the most 105
  • detached house and a building that is part of a house chain 92 - 200 (depending on the size of the house)

Energy certificate 

The energy-efficiency survey of a new building shall include an energy certificate that shows the energy efficiency category of the building (A–G) determined according to the E-factor. The best energy category is A. To obtain a building permit, a new building must usually be in category C or better. Before the commissioning of a building, the energy-efficiency survey required for the building permit is updated to reflect the solutions realized in the building.

06.12.2019 19:02