Quick Answer: Title 24 is California’s Building Energy Efficiency Standards — the energy code that applies to most permitted construction in the Bay Area. Room additions over 500 sq ft, ADUs, and any project requiring a building permit must meet Title 24 requirements for insulation, windows, HVAC, water heating, and lighting. Title 24 compliance typically adds $2,000–$10,000 to a remodel project cost in San Jose.
Title 24 Requirements for Bay Area Remodels — 2025
Helpful Resources:
| Building System | Title 24 Requirement (Climate Zone 4) | Typical Compliance Cost |
|---|---|---|
| Wall insulation | R-15 minimum (new walls) | Included in framing cost |
| Attic/roof insulation | R-38 minimum for vented attic | $1,500–$4,000 |
| Windows | U-factor ≤ 0.30, SHGC ≤ 0.23 in most zones | $300–$800 premium per window |
| HVAC efficiency | Minimum SEER2 15 for central A/C, AFUE 80+ for furnaces | $500–$2,000 equipment upgrade |
| Water heater | Heat pump water heater preferred; solar required for new ADUs | $1,500–$4,000 |
| Lighting | High-efficacy (LED) in all habitable rooms | Minimal — LED standard cost |
| Air sealing | Blower door test required for additions over 1,000 sq ft | $300–$800 testing cost |
When Does Title 24 Apply to a Bay Area Remodel?
- Always required: New construction, ADUs, room additions, second story additions
- Triggered by permit: Any permitted project that adds conditioned square footage
- Partial remodels: Replacing windows, HVAC, or water heater in existing homes must meet current Title 24 minimums
- Kitchen and bath remodels: If walls are opened, insulation may need upgrading; lighting must be LED
- Generally exempt: Cosmetic work (painting, flooring, cabinet replacement) that doesn’t require a building permit
Title 24 Energy Calculation (CF1R Form) — What Your Contractor Needs
For most permitted additions in San Jose, a licensed energy consultant prepares a CF1R (Certificate of Compliance) using HERS-approved software (EnergyPro is the most common in California). The CF1R is submitted with the permit application and defines the specific insulation, window, HVAC, and lighting requirements for your project. HERS field verification (a third-party inspector) may be required for HVAC and duct systems.
Frequently Asked Questions
Does Title 24 apply to a kitchen remodel in San Jose? If your kitchen remodel is permitted and involves opening walls or ceilings, Title 24 insulation and lighting requirements apply to the affected areas. A permit-only cosmetic remodel (cabinets, countertops) generally does not trigger Title 24 compliance requirements.
What climate zone is San Jose for Title 24 purposes? San Jose is in California Climate Zone 4 for Title 24. Coastal cities like San Francisco and Daly City are in Zone 3. Climate zone affects window SHGC requirements, cooling efficiency minimums, and insulation requirements.
What is a HERS rater and do I need one for my Bay Area remodel? A HERS (Home Energy Rating System) rater is a third-party certified inspector who verifies that installed systems meet Title 24 requirements. HERS verification is required for new HVAC installation, duct system replacement, and window replacements on permitted projects in most Bay Area cities.
Quartz Construction & Remodeling (CSLB #1003436) handles all Title 24 compliance requirements for Bay Area remodels, including energy calculations, HERS coordination, and compliant material selection. Call (650) 749-7436 for a free project consultation.
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