California's 2026 Title 24 energy code requires all new homes to include solar-ready roofing, heat pump-ready infrastructure, enhanced insulation, and LED lighting. Going beyond code to net-zero adds 5 to 10 percent to construction cost.
Every new LA home must meet: R-21+ wall insulation, R-38+ ceiling insulation, dual-pane Low-E windows, LED lighting with dimmers, solar-ready roof conduit and panel space, heat pump-ready plumbing and electrical, and whole-house mechanical ventilation. These are minimums, not aspirational.
6-8 kW system for a typical 2,500 sqft home ($15K-$25K). New construction advantage: design roof orientation for optimal solar exposure (south-facing in LA), pre-run conduit during framing. Federal 30% tax credit reduces cost to $10.5K-$17.5K. Pays for itself in 5-7 years.
Heat pump HVAC (ducted or mini-split): most efficient option for LA's mild climate. Heat pump water heater: 3x more efficient than gas. Induction cooktop: faster than gas, no combustion. All-electric home eliminates gas line ($2K-$5K savings in construction) and qualifies for LADWP HOME LA incentives.
Spray foam insulation in walls ($3-$5/sqft vs $1-$2 for fiberglass) creates an air-tight envelope that dramatically reduces HVAC load. Combined with high-performance windows (U-factor 0.25 or lower), your HVAC system can be downsized — saving $3K-$8K on equipment.
Net-zero = annual energy production equals consumption. Requires: above-code insulation, heat pump systems, solar array sized to offset usage, LED lighting, smart home energy management. Adds 5-10% to construction cost but eliminates energy bills. Increasingly common in high-end LA custom homes.
← Back to Custom Home Design Guide
NP Line Design (CSLB #1105249). April 2026.
“Title 24 has transformed custom home energy design in LA over the last 5 years, and the 2022 code cycle pushed requirements significantly further than most homeowners or even some architects realize. In LA's climate zone 9 and 10 (most of the Valley and Inland areas), new homes now effectively require all-electric systems with solar PV production matching or exceeding projected energy use. This is not optional — the compliance math requires it. The clients who embrace this early and design around it end up with better, more future-proof homes. The ones who fight it spend more in engineering fees trying to find workarounds.”
In LA's climate, passive design strategies (correct window orientation, deep eaves, thermal mass walls) can reduce HVAC load by 30 to 50 percent before mechanical systems are even specified. A project that invests $15,000 to $30,000 more in the building envelope during design ends up with a significantly smaller HVAC system, lower installation cost, and lower lifetime operating cost. An energy consultant on the design team from the start (not added at permit time to run compliance numbers) delivers far more value.
1. Designing a custom home with gas appliances without running the Title 24 compliance calculation first — many LA climate zones now cannot achieve compliance with gas HVAC and water heating without extensive solar offset
2. Installing minimum-code solar PV rather than right-sizing the system for actual projected energy use, then adding battery storage later at 30 to 50 percent higher cost than if it had been included at initial install
3. Specifying high-performance windows without coordinating with the structural engineer on the building's thermal mass design — window placement and orientation in LA's climate determines whether the building passively heats or cools, independent of mechanical systems
An architect or builder who does not address Title 24 compliance methodology in their first conversation about a new home is not current on California energy code. Title 24 is not a minor checkbox — it is a fundamental design constraint that should shape window placement, HVAC specification, solar sizing, and envelope assembly from the first schematic.
California Title 24 (2022 code) requires new residential construction to meet the All-Electric Reach Code or demonstrate equivalent energy performance through alternative compliance. LA's Building Code has adopted this requirement. In practice, this means heat pump HVAC, heat pump water heater, solar PV system sized to the energy load, and enhanced envelope insulation. All-electric readiness (pre-wired for EV charging, induction cooking, and heat pump) is required even if some gas systems are approved via alternative compliance.
High-performance energy features add 5 to 12 percent to custom home construction cost. For a $2,000,000 LA custom home, that is $100,000 to $240,000 in additional upfront cost for above-code insulation, high-performance windows, heat pump systems, solar PV, and battery storage. These features return through lower utility bills (LA DWP rates among the highest in the nation) and through higher home valuations — energy-efficient homes appraise at a premium in LA's market.
Yes. California Title 24 (2022) requires solar PV on all new residential construction. The system size must meet minimum kWh production requirements calculated per the home's conditioned floor area. LADBS enforces this requirement at plan check. Battery storage is not currently required but is increasingly specified for resiliency (grid outages, VHFHSZ wildfire risk) and to maximize the value of the solar investment.
A variable-speed heat pump system (air-source or ground-source) is the highest-performance HVAC for a new LA custom home, combining heating and cooling in one system with 2.5 to 4 times the efficiency of resistance heating. Ducted mini-split systems work well in open plans; zoned multi-head systems allow precise room-by-room control in larger homes. Pair with a heat pump water heater and an ERV (energy recovery ventilator) for whole-house air quality.