Title 24 Requirements for Residential Projects in Southern California (2026 Guide)

Title 24 is California’s energy code — and it applies to every residential project in Southern California that needs a building permit. Whether you're doing a remodel, room addition, garage conversion, new patio, detached ADU, or full new construction in counties like Riverside, San Bernardino, Orange, or Los Angeles, you must comply with Title 24.

Missing or incorrect Title 24 compliance is one of the top reasons plans get rejected by county building departments. In 2026, the rules are even stricter to meet climate goals. Here’s a straightforward guide to Title 24 requirements for residential projects in Southern California.

What Is Title 24?

Title 24 is part of the California Building Standards Code (specifically the California Energy Code). It sets minimum standards for energy efficiency in buildings, covering lighting, HVAC, insulation, windows, appliances, and renewable energy. The goal is to reduce energy use and greenhouse gas emissions.

For residential projects, Title 24 applies to:

• New construction

• Major remodels/additions

• Garage conversions

• Detached ADUs

• Patio/deck structures with electrical or lighting

• Any project that adds conditioned space or modifies energy systems

Key Title 24 Requirements in 2026 for Southern California

1. Energy Modeling & Compliance Software

   • Plans must be modeled using approved software (e.g., CBECC-Res) to show the project meets or beats energy budgets.

   • Michael's Drafting coordinates Title 24 reports and modeling for permit submission.

2. Solar Readiness

   • All new homes and most additions/ADUs must be solar-ready (roof space, conduit, panel capacity).

   • Solar panels are required for new construction in most cases (2020+ rule, strengthened in 2026).

   • Exceptions for shaded or small roofs — but documentation is needed.

3. Insulation & Building Envelope

   • Minimum R-values: R-30 ceiling, R-21 walls, R-10 slab (varies by climate zone).

   • Southern California has multiple climate zones (e.g., Zone 8 inland, Zone 9 coastal) — check your ZIP code.

   • Air sealing and high-performance windows are required to reduce leaks.

4. Lighting & Appliances

   • High-efficiency LED lighting (90%+ of fixtures).

   • ENERGY STAR appliances (refrigerators, washers, dryers).

   • Occupancy sensors or dimmers in some areas.

5. HVAC & Ventilation

   • High-efficiency heat pumps or AC units.

   • Whole-house mechanical ventilation (50–160 CFM fans).

   • Future EV/ESS readiness (conduit and panel space).

6. Water Heating

   • Heat pump water heaters required for most new homes/ADUs.

   • Gas water heaters need special justification and efficiency ratings.

How Title 24 Affects Your Project

• Garage Conversions: Must upgrade insulation, add ventilation, and meet lighting/HVAC rules.

• Room Additions/Remodels: New space must comply; existing space may need upgrades if modified.

• Detached ADUs: Full compliance required (solar-ready, insulation, Title 24 report).

• Patio/Outdoor Structures: Electrical/lighting additions trigger Title 24 (efficient fixtures, controls).

Non-compliance = permit rejection or stop-work orders. Accurate drafting and early Title 24 modeling prevent this.

How to Comply Quickly in Southern California

• Work with a drafter who handles Title 24 (Michael's Drafting includes reports in every permit set).

• Get energy modeling early — before final plans.

• Choose compliant materials (e.g., high-efficiency windows, insulation).

• Submit complete plans first time — avoids corrections (Michael's Drafting knows common county comments).

• Budget $10,000–$30,000 for Title 24 upgrades (solar-ready, heat pumps, etc.).

Title 24 makes Southern California homes more efficient and sustainable — and it’s mandatory for permits.

Ready to ensure Title 24 compliance for your project? Contact Michael's Drafting for architectural drafting, Title 24 reports, and permit-ready plans in Southern California. Free consultation – call 909-486-3789 or email info@michaelsdrafting.com today.