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Building Code Board of Appeals <br />Packet <br />May 12, 2025 <br />Page 10 of 64 <br />R405.1 Scope. This section establishes criteria for compliance using <br />Simulated Building Performance analysis. Such analysis shall include <br />heating, cooling, mechanical ventilation, and service water heating energy <br />only. Such analyaio c x I I -united t nts. Sees-o+ <br />than dwelling units in Grew R 2, R 3 cx. R 1 "►:ildings shall comply <br />with Sections R402 through R404. <br />This pathway in the base code allows builders to <br />model and compare the efficiency of their proposed <br />design to a standard reference design. This <br />amendment uses site energy as the modeling metric <br />instead of fuel -specific energy cost (LECC), which <br />shifts the focus to the actual energy demand and <br />consumption instead of highly variable utility <br />costs. Consistent with the other sections, the <br />amendment also adds a differential between mixed <br />fuel homes and all -electric homes, and adds a <br />differential between regular homes and large homes. <br />[Simplification from base and LECC] [Cost reduction] <br />19.Section R405.2 Simulated building performance compliance, item #3, <br />is replaced as follows: <br />3. For each dwelling unit, the annual site energy use shall be less than or <br />equal to the applicable percentage of the annual site energy use <br />indicated in Table R405.2(1), as compared to the standard reference <br />design. <br />TABLE R405.2(1) SIMULATED BUILDING PERFORMANCE COMPLIANCE <br />TARGET <br />BUILDING SIZE MIXED FUEL ALL -ELECTRIC <br />Dwelling units with an average of <3,500 <br />square feet (325 m2) or less of conditioned 80% 85% <br />floor area <br />Dwelling units with an average of 3,500 <br />square feet (325 m2) to 4,999 square feet 70% 75% <br />(464 m2) of conditioned floor area <br />a. Informative note: Site energy use should be expressed in either kBtu/year or k 3tu/ft2/year of <br />conditioned floor area. <br />b. Dwelling units with greater than 5,000 square feet (325 m2) of conditioned floor area must comply <br />with the Energy Rating Index pathway in R401.2.3 or the Passive House pathway in R401.2.5. <br />20.Table R405.2 Requirements for Simulated Building Performance is <br />renumbered as Table R405.2(2). <br />