Building acoustics is related to the control of sound propagation between rooms and buildings.

Its application contributes to the acoustic comfort of a space. The correct design and application of the principles of building acoustics is essential to achieve desired levels of sound insulation between spaces. The acoustic comfort of a space is one of the specifications described in the Building Regulation, as approved by the Government Gazette (3985 B´ 22/06/2024). It is noted that in early 2025, the Hellenic Institute of Acoustics submitted a proposal to the General Secretariat for Spatial Planning and Urban Environment of the Ministry of Environment and Energy for the replacement of Article 22 (Sound Insulation - Noise Pollution) of the Building Regulation. Dr. Brezas contributed to the drafting of the proposal as a member of the writing team.

Sound reduction between rooms is related to sounds generated by sources and propagated through the air (airborne), and sounds generated by an impact and propagated through structures (structure-borne). The services offered include measurements of airborne and impact noise. Software is used to calculate the sound insulation of vertical and horizontal partitions (walls, floors, ceilings), which may be either simple (single partitions) or complex (double, triple, etc.). Building acoustics applications are found in residencies, schools, universities, hospitals, health care facilities, hotels, recording studios, etc. Indicators of structural acoustics are used to meet requirements included in legislation and standards such as LEED and BREEAM.