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A4.204.1 Energy Efficiency
A4.204.1.1 Tier 1
Buildings complying with the first level of advanced energy efficiency shall have an Energy Budget that is no greater than indicated below, depending on the number of mechanical systems added. Space heating systems, space cooling systems and water heating systems are each separate mechanical systems for the purpose of complying with this requirement. If the addition changes only the envelope with no change to any mechanical system, then no additional performance requirements above Title 24, Part 6 are required.
  1. For one and only one mechanical system: No greater than 95 percent of the Title 24, Part 6 Energy Budget for the Standard Design Building as calculated by Compliance Software certified by the Energy Commission.
  2. For two or more mechanical systems: No greater than 90 percent of the Title 24, Part 6 Energy Budget for the Standard Design Building as calculated by Compliance Software certified by the Energy Commission.
A4.204.1.2 Tier 2
Buildings complying with the second level of advanced energy efficiency shall have an Energy Budget that is no greater than indicated below, depending on the number of mechanical systems added. Space heating systems, space cooling systems and water heating systems are each separate mechanical systems for the purpose of complying with this requirement. If the addition changes only the envelope with no change to any mechanical system, then no additional performance requirements above Title 24, Part 6 are required.
  1. For one and only one mechanical system: No greater than 90 percent of the Title 24, Part 6 Energy Budget for the Standard Design Building as calculated by Compliance Software certified by the Energy Commission.
  2. For two or more mechanical systems: No greater than 85 percent of the Title 24, Part 6 Energy Budget for the Standard Design Building as calculated by Compliance Software certified by the Energy Commission.
Note: For Energy Budget calculations, high-rise residential and hotel/motel buildings are considered nonresidential buildings.

Related Code Sections

Section A4.204 Residential Voluntary Measures, Performance Approach for Additions
with no change to any mechanical system, then no additional performance requirements above Title 24, Part 6 are required. For one and only one mechanical ...
Section A5.203 Nonresidential Voluntary Measures, Performance Approach
constructed building or addition does not include indoor lighting or mechanical systems, then no additional performance requirements above Title 24 ...
Section A5.203 Nonresidential Voluntary Measures, Performance Approach
or mechanical systems, then no additional performance requirements above Title 24, Part 6 are required. For nonresidential building projects ...
Section A5.203 Nonresidential Voluntary Measures, Performance Approach
, then no additional performance requirements above Title 24, Part 6 are required. For nonresidential building projects that include indoor lighting ...