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New construction · Costa Mesa

How do Title 24 and CALGreen affect new construction in Costa Mesa?

Costa Mesa is in California Energy Code Climate Zone 8. Title 24 sets the envelope, HVAC, and renewable requirements; CALGreen sets the green-building baseline. Both are enforced by City of Costa Mesa Development Services Department — Building & Safety Division at plan check and inspection.

What changes the answer in Costa Mesa.

California Energy Commission Climate Zone 8. New single-family homes must comply with the current Title 24 Part 6 envelope, HVAC, hot-water, and rooftop solar-PV requirements. CALGreen Part 11 mandatory measures (≥65% C&D waste diversion, water-efficient fixtures, indoor-air-quality measures) apply to all new homes. Costa Mesa may layer reach-code or local green-building amendments — confirm the current adopted ordinance at intake.

  • Climate Zone 8 compliance pathway
  • California Energy Commission Climate Zone 8. New single-family homes must comply with the current Title 24 Part 6 envelope, HVAC, hot-water, and rooftop solar-PV requirements.
  • CALGreen Part 11 mandatory measures (≥65% C&D waste diversion, water-efficient fixtures, indoor-air-quality measures) apply to all new homes. Costa Mesa may layer reach-code or local green-building amendments — confirm the current adopted ordinance at intake.
  • Strong California solar resource; Title 24 PV sizing is calculated per conditioned floor area and orientation.

Source-backed note

Title 24 Part 6 (energy) and CALGreen are state-mandated baselines; local ordinances frequently add reach-code amendments such as all-electric requirements.

Reference: California Energy Code (Title 24, Part 6) — California Energy Commission

Local authority: City of Costa Mesa Development Services Department — Building & Safety Division

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