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Do solar panels increase home value in California?
Updated August 7, 2026 · based on historical Berkeley Lab (2015) and Zillow (2019) research · by Cali Energy
Do solar panels increase home value in California? Research points to a premium — Berkeley Lab found about $3–$4 per watt and Zillow about 4% of home value — but those are historical studies (homes sold 2002–2013 and 2018, in nominal dollars), not a 2026 appraisal. An owned system transfers cleanly and can add value; a lease usually adds nothing and can complicate a sale.
✓ Two well-known studies, shown as historical benchmarks — not a current valuation. See the sources and the fine print ↓
Historical research benchmarks in nominal dollars — not a 2026 appraisal. Berkeley Lab studied 2002–2013 sales; Zillow, 2018. Real appraisals vary by home, market, system age and buyer.
The rates and figures this calculator usestap to verify
This tool applies two well-known research benchmarks to your system. Both are historical studies in nominal dollars — clearly labeled below — not a current 2026 appraisal.
| Premium | ~$3–$4 per watt of PV |
| Sample | ~22,000 sales, 2002–2013, published 2015 |
| Dollars | nominal (year of sale), not inflation-adjusted |
| Premium | ~4.1% of home value (national) |
| Los Angeles specifically | ~3.6% |
| Sample | sales Mar 2018–Feb 2019, published 2019 |
| Owned range | watts × $3 to watts × $4 |
| Zillow comparison | home value × 4.1% |
| Financed | owned midpoint − loan balance |
| Lease / PPA | $0 added value |
These are historical research benchmarks in nominal dollars, not a 2026 appraisal. Berkeley Lab’s “Selling into the Sun” (Hoen et al., 2015) analyzed roughly 22,000 home sales from 2002–2013 and found a premium near $3–$4 per watt; Zillow’s 2019 analysis of 2018 sales found about 4.1% nationally (3.6% in Los Angeles). Both predate today’s market, lower panel prices and the end of the federal credit, so treat them as directional, not a current valuation. An appraiser sets real value from local comps, system age and condition. Leased and PPA systems generally show no resale premium and can complicate a sale.
Example results you can reproduce
In Owned / cash mode, each row shows the Berkeley Lab range and the Zillow comparison — enter the same system size and home value above to reproduce it.
| System · home value | Berkeley Lab range | Zillow ~4% comparison |
|---|---|---|
| 6 kW · $750,000 | $18,000 – $24,000 | ~$30,750 |
| 8 kW · $900,000 | $24,000 – $32,000 | ~$36,900 |
Switch to Solar loan and the remaining balance is subtracted from the owned midpoint; a lease/PPA shows $0 added value.
How this calculator works
It applies two research figures to your inputs. In owned mode it multiplies your system’s watts by $3–$4 (the Berkeley Lab range) and, for comparison, shows ~4.1% of your home value (Zillow). In loan mode it subtracts your remaining balance from the owned midpoint, because the value transfers but so does the debt. In lease/PPA mode it shows $0, since studies find no resale premium for systems you don’t own. It doesn’t combine the two studies into a single number — they’re different methods, shown side by side.
How to read your result
Read these as historical, directional figures, not a 2026 appraisal. The Berkeley Lab dollars are from 2002–2013 sales and the Zillow percent from 2018 — useful for scale, not for a listing price. The most important distinction on the page isn’t the dollar amount; it’s ownership: an owned system is the case the studies measured, a financed one carries a balance to clear, and a leased one typically adds nothing.
What moves the result the most
Ownership status dominates — owned, financed or leased changes the answer far more than a few tenths of a dollar per watt. After that, system size (more watts, larger Berkeley Lab figure) and your home value (which scales the Zillow comparison). A loan balance directly reduces the net, and clearing it before closing restores the owned-system behavior.
Common questions
Are these current 2026 values?
No — they’re historical research benchmarks in nominal dollars (Berkeley Lab 2002–2013 sales, Zillow 2018). Use them for scale; an appraiser sets actual value from today’s local comps.
Which is right — Berkeley Lab or Zillow?
They measure differently: Berkeley Lab in dollars per watt, Zillow as a percent of home value. The tool shows both rather than blending them, so you can see the range each implies.
Does a leased system add value?
Generally no. Studies find a premium for owned systems only; a buyer must usually qualify for and assume the lease/PPA, which can slow a sale rather than add value.
What about a system on a loan?
The value transfers, but the balance goes with it — typically paid off at closing from proceeds, or assumed by the buyer. Any lien or fixture filing must be cleared for clean title.
Will an appraiser use these numbers?
Not directly. Appraisers rely on comparable local sales, the system’s age and condition, and whether it’s owned. These benchmarks are context, not an appraisal input.
How do I protect the value when selling?
Own the system (pay off any loan before or at closing), keep documentation and warranties, and ensure clean title. Our guide on selling a house with solar covers the paperwork.
Sources
- Lawrence Berkeley National Laboratory — Selling Into the Sun (2015)
- Zillow Research — Homes With Solar Panels Sell for 4.1% More (2019)
- California BOE — Active Solar Energy System Exclusion
- California SB 710 (2025) bill text
- IRS — Residential Clean Energy Credit
- EIA — Electric Power Monthly, average residential rates
- SCE — Time-of-Use Residential Rate Plans
- LADWP — Residential Electric Rates
- CPUC — Net Billing Tariff (NEM 3.0)
Estimates only, not a quote. Assumptions, rates, incentives and program rules can change — confirm current details with your utility, the program administrator or a licensed professional.
Read the full guide →