Building acoustics plays a crucial role in determining the acoustic comfort and functionality of indoor spaces. This chapter provides an introductory overview of key principles and considerations in building acoustics, focusing on both airborne and impact sound transmission. Effective noise mitigation techniques are discussed, encompassing architectural design strategies, material selection, and structural solutions aimed at reducing sound transmission between spaces. The importance of adhering to regulatory standards and guidelines for noise control in various building types is emphasized. By understanding these fundamentals, architects and engineers can design and construct buildings that prioritize acoustic comfort, enhancing overall occupant satisfaction and well-being.