From sustainable materials to certified products and code compliance, trade professionals are tasked with keeping up to date on the latest industry standards. Title 24 of California’s Energy Code sets forth a compliance framework, guiding A+D professionals to make smart lighting decisions that improve living conditions for humans and nature alike.
First put into effect in 1978 and updated on a roughly three-year (triennial) cycle, Title 24 continues to evolve — and the 2025 standards are now in effect. Whether specifying for a residential remodel or a commercial buildout, understanding these requirements ensures projects move forward without costly delays.
In this guide, you’ll learn what Title 24 covers, what changed in 2025, and how to navigate the key lighting compliance categories with confidence.
What Is California's Title 24?
In 1978, California’s Energy Commission introduced Title 24, a set of standards designed to preserve environmental quality of indoor and outdoor spaces while increasing energy efficiency in new and existing buildings. Revisited and updated every three years, Title 24 extends to both residential and commercial spaces throughout the state.
Title 24 compliance is triggered when a building permit is pulled, covering new construction, additions, and alterations. For residential projects, the standards apply to single-family homes and low-rise buildings of three stories or fewer. Non-residential applications include commercial buildings, hotels and motels, and high-rise multifamily structures.
For the latest code documentation and updates, refer to the California Energy Commission’s 2025 Building Energy Efficiency Standards.
What's New In The 2025 Title 24 Lighting Code
The current standards are the 2025 Title 24, Part 6 (California’s Building Energy Efficiency Standards), which took effect January 1, 2026. Permits filed on or after January 1, 2026 must comply with the 2025 standards; permits filed before that date fall under the 2022 code.
Rather than a sweeping overhaul, the 2025 update brings targeted adjustments and clarifications. Key lighting changes include:
- Reduced Lighting Power Density (LPD): Requirements tightened by roughly 5% for many commercial spaces. Office LPD dropped from about 0.75 to about 0.65 W/ft²; retail spaces moved from about 1.0 to about 0.9 W/ft².
- Compliance Path Consolidation: The Tailored Method was removed as a compliance path. Its wattage allowances now fall under the Area Category Method as Additional Power Allowances.
- Expanded Daylight-Harvesting Requirements: In qualifying daylit zones over about 75 watts, lighting power must be able to drop by at least about 90% when daylight levels are high.
- Updated Compliance Metric: The compliance metric shifted from Time Dependent Valuation (TDV) to Long-Term System Cost (LSC), which weighs a 30-year view of energy cost.
For the specific requirements and figures, refer to the CEC’s 2025 Nonresidential Compliance Manual.
Lighting + Title 24 Compliance: The Key Requirements
Title 24 organizes lighting compliance around six key control categories. Note that specific thresholds can tighten with each code cycle, so always verify against the current standards for your permit date.
Luminaire Classification
All fixtures must receive a classification label, and a permanent label must display maximum rated wattage. This ensures every luminaire in a project is properly documented for energy calculations.
Independent Manual Controls
Display and decorative lighting must have separate, easily accessible controls from general lighting. This allows occupants to turn off accent illumination without affecting primary task lighting.
Multilevel Lighting Controls
LED luminaires are allowed continuous dimming from 10% to 100%. Track lighting systems under 20 watts must have a minimum of one step between 30% and 70%. High-intensity discharge lighting requires at least one step between 50% and 70%.
Shutoff Controls
Automatic time switches and vacancy sensors are required for qualifying spaces. No single control can cover more than 5,000 square feet. Certain spaces — including loading areas and parking garages — are allowed a partial-off strategy.
Daylighting + Controls
The code identifies three daylit zone types: skylit, primary sidelit, and secondary sidelit. In qualifying daylit zones, lighting power must reduce by at least 90% (down to no more than 10% of full output) when daylight contributes more than 150% of the overall designed system’s light level.
Outdoor Lighting
Outdoor lighting zones range from LZ0 (undeveloped or open areas) to LZ3 (urban environments), with an LZ4 tier defined in the code for very high-intensity areas though no California locations are currently designated LZ4. The “BUG” rating system — Backlight, Uplight, Glare — classifies fixtures from B0/U0/G0 (best performance) to B5/U5/G5 (worst performance).
Title 24 Lighting Controls At A Glance
| Control Type | Requirement |
|---|---|
| LED Dimming | Continuous dimming from 10% to 100% |
| Track Lighting (<20W) | Minimum one step between 30% and 70% |
| HID Lighting | At least one step between 50% and 70% |
| Shutoff Controls | No single control covering more than 5,000 sq ft |
| Daylight Response | Reduce lighting power by at least 90% when daylight exceeds 150% of design level |
| Outdoor Zones | LZ0 (undeveloped) to LZ4 (high-intensity); LZ0–LZ3 currently designated in California |
| BUG Rating | B/U/G 0 (best) to 5 (worst) |
Title 20 And JA8: Related California Lighting Standards
Understanding how Title 20, Title 24, and JA8 interrelate helps clarify what specifiers and buyers should look for.
Title 20 governs appliance efficiency, including State-Regulated LED lamps and small-diameter directional lamps. Title 24 covers energy efficiency in buildings. Both standards are administered by the California Energy Commission.
JA8 (Joint Appendix 8) is the part of Title 24 that sets performance requirements for light sources in residential buildings. JA8-certified sources — including screw- and pin-based LED lamps, GU-24 based sources, recessed downlights, and integral-source LED luminaires — are what make a residential fixture “Title 24 compliant.”
When sourcing for California residential projects, the JA8 mark is the certification that specifiers and buyers look for to confirm compliance.
Why Title 24 Compliance Pays Off
Meeting Title 24 standards delivers benefits that extend well beyond passing inspection:
- Long-term energy savings: Efficient fixtures and smart controls reduce operating costs over the life of a building.
- Reduced light pollution: Outdoor lighting zones and BUG ratings protect nighttime environments. Learn more about light pollution and dark-sky compliance.
- Better-feeling spaces: Daylighting integration, dimming controls, and thoughtful zoning contribute to occupant comfort and wellbeing.
- Statewide impact: The 2025 code is projected to reduce statewide energy costs by about $4.8 billion, demonstrating the collective benefit of individual compliance.
- Streamlined project approvals: Specifying compliant fixtures from the outset avoids permit delays, re-orders, and installation rework.
Frequently Asked Questions
What Does Title 24 Mean?
Title 24 refers to Part 6 of the California Code of Regulations — the Building Energy Efficiency Standards established by the California Energy Commission. It sets mandatory requirements for energy use in new construction, additions, and alterations throughout the state.
What Makes A Light Fixture Title 24 Compliant?
For residential applications, a fixture is Title 24 compliant when it uses a JA8-certified light source. JA8 (Joint Appendix 8) defines performance requirements for LED lamps, GU-24 sources, recessed downlights, and integral-source LED luminaires. The JA8 certification mark indicates the product meets these standards.
Does Title 24 Apply To My Project?
Title 24 compliance is triggered when a building permit is pulled in California. This includes new construction, additions, and alterations to both residential and non-residential buildings. If your project requires a permit filed on or after January 1, 2026, the 2025 standards apply.
What’s The Difference Between Title 20 And Title 24?
Title 20 regulates appliance efficiency, including standalone LED lamps and directional bulbs. Title 24 governs building energy efficiency, encompassing the installed lighting systems within structures. Both are California Energy Commission standards, but they address different scopes — products versus buildings.
What Does The Title 24/JA8 Logo On A Fixture Mean?
The JA8 logo indicates that a light source or luminaire meets the performance requirements outlined in Joint Appendix 8 of Title 24. For residential projects in California, this certification confirms the fixture can be used to satisfy Title 24 compliance.
Small, smart adjustments — from specifying JA8-certified sources to integrating daylight-responsive controls — carry long-lasting effects for the environment and the quality of design. With the 2025 Title 24 standards now in effect, staying current ensures your California projects meet code while delivering the energy efficiency and comfort that clients expect.
