New Home Title 24 Report

Under §150.1(a), a newly constructed single-family home meets the mandatory measures of §150.0 and then either the prescriptive package for its climate zone or the performance path. The 2025 package assumes a heat pump, solar PV and Quality Insulation Installation in every zone, and the Title 24 report is the Certificate of Compliance showing the plans meet it.

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Three layers, in a fixed order

Section 150.1(a) sets the structure. A new single-family home meets the applicable general requirements of Sections 110.0 to 110.10, the mandatory features of §150.0, and then either the prescriptive or the performance standards for its climate zone. The mandatory layer applies on both paths and cannot be traded away. The wider framework is on Title 24 requirements.

The prescriptive path builds to the component package in Table 150.1-A, item by item. The performance path models the home in Commission-certified software against a standard design built from that same package, and it complies if its source energy and long-term system cost come out no higher, so a shortfall in one component can be made up in another. The comparison is on prescriptive vs performance.

What the 2025 package assumes

The package is also the yardstick for the performance model:

  • Heat pump space heating in all 16 zones. Under §150.1(c)6 the system is a heat pump, or the home takes the performance path. See heat pump requirements.
  • Heat pump or solar water heating under §150.1(c)8, covered on water heater requirements.
  • Quality Insulation Installation in every zone, under §150.1(c)1E. See what QII involves.
  • Glazing at a U-factor of 0.27 or 0.30 depending on zone, total window area no more than 20 per cent of conditioned floor area, and west-facing area no more than 5 per cent in most zones.
  • A whole-house fan in climate zones 8 to 14, with at least 1.5 cfm of rated airflow per square foot of conditioned floor area. Homes of 500 square feet or less are excepted.
  • A cool roof on steep-sloped roofs in zones 10 to 15 and low-sloped roofs in zones 13 and 15, under §150.1(c)11.

Solar, and wiring for a battery

Section 150.1(c)14 requires PV on every new single-family home, sized at the smaller of Equation 150.1-C or the solar access roof area multiplied by 18 for a steep-sloped roof, or 14 for a low-sloped one. Below 1.8 kWdc, none is required. The method is on solar on a new home.

A battery is optional. A home with electrical service over 125 amps must be battery-ready under §150.0(s) unless one is installed, and a qualifying battery of at least 7.5 kWh lets the PV size from the equation drop by 25 per cent. The detail is on JA12 battery storage.

Ventilation and the kitchen hood

Section 150.0(o) requires whole-dwelling mechanical ventilation, sized from floor area and bedroom count, plus local exhaust in each kitchen and bathroom. The sizing method is on whole-house ventilation.

What an ECC-Rater verifies

Some field verification is unavoidable: §150.0(o)2A makes the whole-dwelling ventilation airflow a mandatory check. The certificate lists every item that applies, and the usual set is:

  • duct leakage of 5 per cent or less of air handler airflow, under §150.0(m)11
  • airflow of at least 350 cfm per ton, with fan efficacy of 0.45 W/cfm for a gas furnace air handler or 0.58 W/cfm for others, under §150.0(m)13
  • refrigerant charge on a heat pump in every zone, or on an air conditioner in zones 2 and 8 to 15
  • QII, inspected in stages before the walls are closed
  • the ventilation airflow, and the HVI or AHAM rating of a vented range hood under §150.0(o)2B
  • the fault indicator display on an HRV or ERV, under §150.1(c)15

The rater was called a HERS rater until 1 January 2026. Because these items need verification, the Certificate of Compliance is registered with an ECC-Provider’s data registry.

What the report needs from the plans

A prescriptive design is documented on CF1R-NCB-01-E and a performance design on CF1R-PRF-01-E. Both are built from the drawings:

  • a site plan with a north arrow, since orientation drives the glazing results
  • floor plans, elevations and sections, with conditioned floor area and bedroom count
  • a window and door schedule with sizes and NFRC U-factor and SHGC
  • wall, roof and floor assemblies, and a roof plan showing slope and obstructions
  • the heating, cooling and water heating equipment, the duct location, the range fuel type and the electrical service size

Gas appliances bring electric-ready wiring, listed on do new homes have to be all-electric.

Other Residential Projects

  1. Does a Kitchen Remodel Need Title 24?
  2. Does a Bathroom Remodel Need Title 24?
  3. Title 24 Re-Roofing and Cool Roof Requirements

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