BUILDING REGULATIONS
stages and can establish a TER and DER for compliance. If the dwelling is being extended, there is a “material change of use” (conversion) or even a change to the energy status. For example, extensions with large amounts of glazing, barn conversions or converting a commercial building into a dwelling will all require SAP Calculations for compliance. FOR COMMERCIAL BUILDINGS For conservation of fuel and power in non-dwellings, the national Calculation Methodology used for compliance includes either Simplified Building Energy Modelling (SBEM) or Dynamic Simulation Modelling (DSM). A new building must achieve a Building Emission Rate (BER) equal to or lower than the Target Emission Rate (TER) established before the building is constructed. Similarly to SAP, SBEM or DSM calculations are used to calculate the energy performance of a building at both “design” and “as built” stages and can establish a TER and BER for compliance. Commercial buildings that have large extensions or experience a change of energy status from a conversion may require energy calculations to comply.
For example, extensions that are greater than 100m2 and account for more than 25% of the total useful floor area of the existing building will require SBEM calculations to comply. REPUBLIC OF IRELAND In RoI, Part L of the Building Regulations sets out requirements for the conservation of fuel and energy, and it was updated in 2019 to include the Energy Performance in Buildings Directive (EPBD) requirement for Nearly Zero Energy Buildings (NZEB) compliance, established by the European Union. The goal of Part L is to achieve carbon- neutral dwellings soon, and the new requirements represent a 70% improvement in energy efficiency in comparison to Part L 2005. The nearly zero or very low amount of energy required should be covered to a very significant extent by energy from renewable sources. COMPLIANCE WITH NZEB The Irish Building Regulations specify the Dwelling Energy Assessment Procedure (DEAP) as the official tool for calculating the energy performance and associated carbon dioxide emissions for the provision
of space heating, ventilation, water heating and lighting in dwellings. The calculation checks that the primary energy consumption associated with the operation of the residential building and the related CO2 emissions do not exceed the Maximum Permitted Energy Performance Coefficient (MPEPC) and the Maximum Permitted Carbon Performance Coefficient (MPCPC). DEAP also checks minimum individual performance levels for fabric insulation, air permeability, heating system, heating controls and the Renewable Energy Ratio (RER). NZEB requires that where major renovations (where more than 25% of the surface envelope of the building undergoes renovation) are carried out on a building, the building should achieve a cost-optimal level of energy performance insofar as is technically, functionally, and economically feasible. This cost-optimal energy performance level is equivalent to a BER B2. For more information, please visit www. finance-ni.gov.uk/publications/topic/2897 and www.seai.ie/home-energy/building- energy-rating-ber/support-for-ber- assessors/technical-support/domestic-ber/ building-regulations-and-standards/
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