In the design stage, it’s important that the standards for insulation, heating systems, and renewable energy sources in both dwellings and non-dwellings are familiarized and achieved. Specify the construction materials that generate less heat loss in the building walls, roofs, floors, and windows, and support airtightness. It should be ensured that they at least meet the minimum standards indicated in Part L. Also ensure that the heating and cooling systems are rated under the Energy-related Products (ErP) Directive, and that lighting solutions and renewable energy sources are efficient and up-to-standard with Part L. Consider designing with future-proofing in mind just in case Part L will be upgraded in the future. It’s also helpful for instances where it’s necessary to upgrade the equipment and systems. Replacement should be made easy to avoid unnecessary costs. Use tools like the Standard Assessment Procedure (SAP) for dwellings and Simplified Building Energy Model (SBEM) for non-dwellings. During the design stage, the design plans should be approved by the Building Control Authority so that if there are any compliance issues, they will be actioned promptly and the architects and designers will redesign the building structure, use other materials, or use other equipment.

In the construction stage, the approved and correct materials, techniques, designs and specifications should be followed through. Also confirm that the HVAC and renewable energy systems are installed correctly according to the approved design, and manufacturer’s specifications. Documenting and keeping records of any construction process is crucial in this stage. Document the practices, materials used, installation, and any changes from the approved design. Compliance certificates should also be obtained, filed, and kept. Conduct regular inspections during the construction process and immediately address issues should they arise.

For the post-construction stage, make sure to verify that the completed building meets the energy efficiency standards indicated under Part L. Ensure that the EPC calculation is based on data gathered from the finished building and obtain an Energy Performance Certificate (EPC). Conduct an air tightness test to see how the finished building prevents uncontrolled air leakage and if that meets the minimum air permeability standards in Part L. Test and commission the HVAC systems and renewable energy sources to see if they’re operational and compliant with Part L. Obtain a Building Control Completion Certification that confirms the building meets the requirements as indicated in Part L regulations.