Part L of the 2017 NZEB Building Regulations is a testament to Ireland's resolve to cut back on energy use and greenhouse gas emissions. Improving a building's performance may provide numerous advantages, like decreased building lifetime operating expenses and increased occupant comfort. Considering that we may spend as much as 90% of our lives indoors, it is essential that we construct good places to live.

A Maximum Energy Performance Factor of 0.3, a Maximum Carbon Performance of 0.35, and a renewable Energy Ratio of 20% are three significant changes to Part L for NZEB compliance.

A number of parts are now more significantly considered throughout the early stages of design in order to achieve the 60% improvement higher than 2008 specifications. To guarantee that they have the technical skills needed to prove compliance, design teams must upskill; specific software has been built to evaluate efficacy. Early in the design process, consideration must be given to the building's fabric's importance for solar shading, airtightness, and glazing ratios, in besides the need to comply with the new regulations for renewable energy sources. All of these elements improves the building's costs and helps maintain its worth over time.