Understanding California’s Solar Mandates for New Builds in 2025

As of 2025, building a new home in California means following updated energy efficiency rules that require solar panel installation.

This mandate, approved by the California Energy Commission as part of Title 24 Building Energy Efficiency Standards, is reshaping how residential construction moves forward in the Golden State. Here’s what you need to know about the California solar mandate for new homes and how it could impact your next build.

What Is the California Solar Mandate for 2025?

The 2025 update to California’s solar mandate requires most new residential construction to include a solar photovoltaic (PV) system. This applies to single-family homes and low-rise multifamily buildings up to three stories. The law builds on the original 2020 solar requirement and now emphasizes solar and battery systems to increase grid resilience and reduce reliance on fossil fuels.

Under the 2025 energy code, all new homes must:

• Include a rooftop solar PV system
• Be sized to meet the home’s expected electricity usage
• Incorporate battery storage in certain areas
• Comply with enhanced energy efficiency standards

These requirements aim to reduce greenhouse gas emissions, cut energy bills, and help California meet its renewable energy goals.

Who Must Comply with the New Solar Requirements?

If you’re planning a new build in California, compliance with this mandate is likely required. The 2025 solar mandate covers:

• New single-family homes
• Duplexes and triplexes
• Low-rise multifamily residential buildings

Certain exemptions may apply, such as properties with limited roof space or those approved for community solar projects. You can learn more about these exceptions by consulting the California Energy Commission.

Benefits of Solar for New Homeowners

Installing solar panels as part of a new home build offers several long-term benefits (read more about the environmental impact, learn how solar adds property value, or see how solar reduces utility bills):

• Lower utility costs from day one
• Increased property value with solar-ready construction
• Energy independence with solar plus battery storage
• Environmental impact by reducing carbon emissions

Adding solar at the construction phase is often more cost-effective than retrofitting later. New homeowners also benefit from federal solar tax credits and local rebates.

How New Day Solar Supports California Homebuilders

New Day Solar has been installing residential solar systems in California for over two decades. We work directly with homeowners, builders, and contractors to design and install code-compliant solar panel systems that meet 2025 standards. From system sizing to solar battery integration, we ensure that every project is tailored to your specific home and energy needs.

We also offer solar system inspections, maintenance plans, and solar panel cleaning to keep your system running efficiently for years to come.

Planning Ahead for a Solar-Compliant Build

If you’re building a new home in 2025 or beyond, now is the time to understand your obligations under California’s solar requirement. Here’s how to stay on track:

• Connect early with a solar installer familiar with Title 24
• Review your home design for optimal solar placement
• Consider battery storage to maximize system performance
• Ensure your project is reviewed and approved by the right local and state agencies

For a smooth process, choose a qualified team like New Day Solar that understands the ins and outs of the 2025 solar panel requirements for new construction.

Building a new home in California comes with exciting opportunities to embrace clean energy and long-term savings.

At New Day Solar, we’re here to guide you through every step of the solar installation process – from planning to final inspection.

Let’s build your brighter future. Contact us today to get started on your solar-compliant new construction project.

Frequently Asked Questions

Do all new homes in California need solar panels in 2025?
Yes, most new single-family homes and low-rise multifamily buildings must include a solar PV system per the 2025 Title 24 energy code.

Are there any exemptions to the solar mandate?
Some homes may be exempt if they have limited roof space or are enrolled in approved community solar programs.

How is the size of the required solar system determined?
The system size is based on the home’s projected annual electricity use, which is calculated during the design phase.

Is battery storage required under the new mandate?
In certain areas, yes. Battery storage is required in climate zones with higher reliability concerns or peak demand.

Can I still qualify for incentives if solar is required?
Yes. Federal tax credits and some local rebates are available even if solar is mandated by the state.

How do I make sure my new home complies with the mandate?
Work with a certified solar installer like New Day Solar who understands the 2025 requirements and can guide you through the compliance process.