California Solar Property Tax Exclusion: What the 2027 Deadline Means for Your Project

Homeowners who finish in time keep the benefit. California's SB 710 protects solar owners who qualify for the exclusion before January 1, 2027, keeping the exclusion in place until the property changes ownership.

What counts as "completed" for your specific system is a question for your county assessor. Final inspection, utility permission to operate and assessor records can land on different dates, so confirm locally rather than assuming.

For an average-sized California home system, losing the exclusion likely means a few hundred dollars a year in added property tax, not thousands.

The California Assembly Revenue and Taxation Committee's April 2026 analysis of AB 2389 estimated the stakes using EnergySage pricing. That analysis put the cost of a 9.13 kW system, the average size in California, at under $23,000, and applying the 1% property tax rate produces an added annual tax of less than $230.

That figure recurs every year the system is assessed, so it is a real cost. The Assembly committee's estimate is also a simplification: your assessor sets the actual added value, and your system size and price may differ. Treat the number as a sense of scale, not a quote.

The most common mistake is treating the California exclusion deadline as the reason to buy solar, or the reason to give up on it. The deadline changes a modest annual tax line. It does not change the two numbers that drive solar economics: what you pay for electricity and what you pay to install.

The pattern is familiar. The federal residential solar credit under §25D is already gone: the IRS states the credit is not available for any property placed in service after December 31, 2025, and an expenditure counts when installation is completed. Homeowners who rushed to beat that date learned that "paid for" and "completed" are different things.

The same logic applies to California's Section 73. A rushed design that fails inspection, needs a plan revision or has mismatched parts costs more than a few hundred dollars a year in property tax.

• What To Do InsteadSize and design the system around your real usage and roof, then see whether the timeline fits the deadline. If it fits, good. If it does not, the project should still stand on its own economics.
• Use Our Free Estimator ToolGet a personalized estimate for a professional-grade self-install solar panel kit.Get Your Estimate

Rising electricity prices are the durable reason homeowners look at solar, now that the federal credit has expired and California's property tax exclusion is sunsetting. The U.S. Energy Information Administration's Short-Term Energy Outlook (September 2026) projects the average residential price at 18.2 cents per kWh in 2026 and 18.6 cents in 2027, up from 16.5 cents in 2024.

• National averages hide sharp local moves.EIA's September 2026 outlook shows residential prices up 36% in a year in Maine and 18% in Connecticut. Your own bill is the number that matters, so check the per-kWh rate on your latest statement.
• A practical rule of thumb:Homeowners paying 20 cents per kWh or more have the most to gain from producing their own power, because every kilowatt-hour a solar system replaces is worth more.

Watch what is coming, too. Utilities in some regions are planning for large new loads, including data centers, and grid upgrades have to be paid for. How those costs reach residential customers is decided in rate cases, so it is worth following your utility's filings rather than assuming today's rate will hold.

Whether a new California solar project can be completed before January 1, 2027, depends on your local permit office and your utility, not only on how fast you can install. Some projects starting in fall 2026 may make it; others will not. Plan around a correct design first and treat the deadline as a bonus if the timeline fits.

1. 1
   Review your usagePull 12 months of electric bills to see what the system has to produce.
2. 2
   Design the systemSize panels, inverter and racking around your roof, usage and future loads.
3. 3
   Prepare permit-ready plansPlan sets are drawn for your jurisdiction, with engineering where required.
4. 4
   Submit permits and utility paperworkYour building department and utility each review the project.
5. 5
   Install the equipmentYou handle the work you are allowed and able to do; a licensed electrician handles the rest where required.
6. 6
   Pass inspectionThe inspector confirms the installed system matches the approved plans.
7. 7
   Receive permission to operateYour utility approves the system to connect and run.

Each review step runs on someone else's calendar. That is the honest reason not to promise a completion date before the design is done and your local offices have responded.

California homeowners have several ways to approach buying and installing solar, and each trades cost against hands-on involvement.

The right choice depends on your unique situation: your energy goals, your budget, your comfort with hands-on work and how much risk you want to carry on design and approvals.

• Turnkey installation is the right call for homeowners who want every step handled by someone else. The extra cost is paying for sales, overhead and labor you might otherwise handle.
• Buying equipment alone is cheapest on paper and riskiest in practice. Panels are the easy part. A complete system still needs a design, plans an inspector will accept and utility interconnection approval.
• Guided self-installsits between turnkey and 100% DIY: do the parts you can handle, and utilize expert help on the parts that have to be right.

Guided self-install is a strong fit for California homeowners who are comfortable with tools, measurements and following a plan, and a poor fit for anyone who wants every step handled. Being honest about fit is part of doing this well.

Unbound Solar helps capable California homeowners save on installation by empowering them to own the parts they can handle, while the design, permit-ready plans and approval path are handled by people who do this kind of work every single day. You stay in control of the project, but you are never left on your own.

• Designed systemsPanels, inverter and racking sized to your home and built to work together, not a cart full of parts.
• Permit-ready plansPlan sets prepared for your jurisdiction, with stamped engineering where required.
• Utility interconnection supportHelp answering the technical questions your utility asks before approving the system.
• Inspection supportGuidance when an inspector or permit office asks for clarification or a revision.
• Electrician-friendly install tierWith Partial Install Help, you set racking and panels and a licensed electrician handles wiring and tie-in.

The design, plans, permits, engineering and support package is the same whichever install path you choose; only the labor changes. On the reference system in Unbound Solar's own estimator, labor savings run roughly 14% for Partial Install Help to 27% for full self-install, compared with full-service installation. That is labor you skip, not corners you cut, and your number will depend on your system.

The fastest way to see whether solar pencils out for your California home is to start with your own numbers. The Unbound Solar estimator models your actual roof from satellite imagery, including area, orientation and shading, and applies real-world losses that simple rule-of-thumb math leaves out.

Enter your address, electric usage and project goals. From there you can have a report emailed to you or request a detailed proposal, and see what kind of system may fit your home, what equipment it needs and what questions to answer before moving forward. A final design may still need professional review for your local rules.