California’s Solar Panel Mandate Explained

California continues to lead the nation in clean energy policy, and the Solar Mandate remains one of its most impactful laws. Originally passed in 2020, the mandate requires most new homes in California to include solar panel systems, helping the state push toward its goal of 100% clean electricity by 2045.

Now in 2025, the mandate has expanded beyond single-family homes to include many new commercial buildings and multi-family developments, making solar not just an option but a standard part of construction. For homeowners, this means long-term savings on energy bills, higher property values, and compliance with state building codes. For builders, it means designing with solar from the ground up and choosing reliable, high-efficiency panels that meet California Energy Commission (CEC) standards.

At US Power, we partner directly with QCells to deliver American-made, factory-direct solar panels at competitive pricing, helping Southern California homeowners and builders stay ahead of state requirements while maximizing savings.

1. The Mandate Is Still in Effect

Since January 1, 2020, California law (Title 24, Part 6) has required solar PV systems on most new residential construction up to three stories. By 2023, the mandate expanded to include commercial buildings and high-rise multifamily developments. In 2025, these requirements remain fully enforced—and more builders are choosing to add battery storage alongside solar to meet evolving code standards.

2. Updated Costs in 2025

• The average solar installation cost in California is about $2.90 per watt in 2025 (down from $3.14 in 2023).
• A standard 5 kW system costs ~$14,500 before incentives.
• With the 30% federal tax credit (ITC), homeowners pay closer to $10,000–$11,000.
• California’s Self-Generation Incentive Program (SGIP) still offers rebates for battery storage, lowering total project costs even further.

3. Exemptions Still Apply

Certain projects can qualify for exemptions, including:

• Roofs too shaded or too small to host a 1.8 kW system
• Off-grid or seasonal properties
• Cases where solar costs outweigh lifetime savings

Builders and homeowners must provide documentation—such as a solar assessment or cost-effectiveness study—for approval.

4. Compliance Pathway in 2025

The process remains consistent, but with faster approvals in many cities:

1. System design based on energy modeling
2. Use of state-approved compliance software
3. Permit submission with local authorities
4. Installation by licensed C-10 or C-46 contractors
5. Utility interconnection approval (Permission to Operate)
6. Homeowner receives manuals, warranties, and compliance documents

5. The Payoff for California Families

• Homeowners save $500–$1,500 annually on electricity.
• Over 25 years, solar can save $20,000–$30,000 depending on utility rates.
• Homes with solar sell at a 3–4% premium compared to non-solar homes.
• In 2025, California’s solar mandate offsets over 4.2 million tons of CO₂ annually, equivalent to removing 120,000+ gas-powered cars from the road.

6. What’s Next in 2025 and Beyond

California continues raising the bar:

• 2026 updates to Title 24 are expected to require battery storage in most new construction.
• EV charging infrastructure is becoming a standard requirement.
• “Solar-ready” retrofits for remodels may soon become mandatory for certain building types.

Why Work with a Local Expert Like US Power

Navigating the California solar mandate doesn’t have to be complicated. US Power specializes in Southern California solar installations, with expertise in local codes, permitting, and energy modeling. With our exclusive partnership with QCells, we provide American-made, factory-direct panels at the best value—ensuring compliance, savings, and long-term reliability.

Ready to make your new home or building Title 24 compliant while saving thousands on electricity? Contact US Power today and get a free solar consultation.