How California Homeowners Can Stop a Neighbor Shading Solar Panels

A neighbor's trees shading your solar panels in California? The Solar Shade Control Act may protect you. Here's the step-by-step process to respond.

If a neighbor's trees or shrubs are shading your solar panels in California, the Solar Shade Control Act (Public Resources Code sections 25980–25986) may give you a direct remedy — especially if the vegetation was planted after your system was installed. Here is the step-by-step process homeowners can follow.

California places special value on solar energy, and that policy gives panel owners protections ordinary "light and air" law does not.

Does California protect solar panels from a neighbor's trees?

Often, yes. As a baseline, California does not recognize a general right to sunlight — neighbors can usually plant or build even if it shades you. But the Solar Shade Control Act creates a specific exception. Generally, a property owner cannot allow a tree or shrub planted after a neighbor's solar collector was installed to cast a shadow that significantly impairs that collector during peak sunlight hours (typically 10:00 a.m. to 2:00 p.m.).

The timing is critical: the protection focuses on vegetation that grew up or was planted after your panels went in.

What are the exceptions?

The Act has important limits. Trees or shrubs that already existed when your solar collector was installed are generally exempt. Certain trees are excepted, and some local governments have adopted their own rules or opted out of parts of the Act. Because the specifics vary, confirm how the law applies in your city or county before acting.

What's the step-by-step process?

1. Confirm the timeline. Establish when your solar system was installed and when the offending trees were planted or grew into the sun path. This is the heart of the claim.
2. Document the shading. Photograph the shadow during peak hours, note the dates, and record any drop in your system's output.
3. Check local rules. Verify whether your city or county follows the Act or has its own solar access ordinance.
4. Contact your neighbor. Many disputes resolve once a neighbor understands the law and agrees to trim. Keep the conversation in writing.
5. Send a formal demand letter. If informal requests fail, a letter citing the Solar Shade Control Act, documenting the shading and timeline, and requesting specific trimming is the effective next step.
6. Escalate if necessary. The Act provides enforcement mechanisms when a neighbor refuses to comply.

What if the trees were there first?

If the vegetation pre-dates your panels, the Solar Shade Control Act generally will not help. Your options then depend on other tools — local ordinances, HOA covenants that protect solar or views, or whether the trees create a separate nuisance. Identifying the right basis matters before you send any demand.

Why send a demand letter?

A professional demand letter is usually the most effective step before enforcement. A letter that correctly invokes the Solar Shade Control Act, documents the shading and the planting timeline, and requests specific corrective action shows your neighbor you understand your rights and gives them a documented chance to fix the problem. It is the same approach that makes demand letters effective across property disputes, and it frequently resolves solar shading without litigation.

This article is general information only and is not legal advice. Consult a licensed attorney for advice specific to your situation.